2026-08-08T05:15:52Z https://publicacoes.softaliza.com.br/cilamce2020/oai

oai:publicacoes.softaliza.com.br:article/6175 2024-07-10T10:58:13Z cilamce2020:ART

Approximate solution of the wave equation using the Multigrid Method Maicon F. Malacarne Marcio A. V. Pinto Sebastiao R. Franco mechanical waves finite difference method hyperbolic equation In order to obtain the solution of the wave equation, the problem is discretized using the Finite DifferenceMethod (FDM). The discretization of the temporal direction is performed using the Time-Stepping Method. Thus,it is a system of equations that involves spatial variables and is solved at every step of the time, which in realproblems, is usually a big variation. Using a conventional solver, such as Gauss-Seidel, to obtain the solution ofsuch systems, convergence factors are very close to the unit, which often implies a very high computational time.To accelerate the convergence and decrease the computational time, it was proposed to use the Multigrid Methodto obtain the solution of the system of equations. Multigrid was initially proposed for elliptical problems, but ithas been used successfully in some parabolic and hyperbolic problems. This work deals especially with waves instrings (1D), where a new approach is proposed to solve this class of problems. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6175 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6175/5232 Copyright (c) 2024 XLI Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/6181 2024-07-10T10:58:13Z cilamce2020:ART

Approximate solution of the wave equation using the Multigrid Method Maicon F. Malacarne Marcio A. V. Pinto Sebastiao R. Franco mechanical waves finite difference method hyperbolic equation In order to obtain the solution of the wave equation, the problem is discretized using the Finite DifferenceMethod (FDM). The discretization of the temporal direction is performed using the Time-Stepping Method. Thus,it is a system of equations that involves spatial variables and is solved at every step of the time, which in realproblems, is usually a big variation. Using a conventional solver, such as Gauss-Seidel, to obtain the solution ofsuch systems, convergence factors are very close to the unit, which often implies a very high computational time.To accelerate the convergence and decrease the computational time, it was proposed to use the Multigrid Methodto obtain the solution of the system of equations. Multigrid was initially proposed for elliptical problems, but ithas been used successfully in some parabolic and hyperbolic problems. This work deals especially with waves instrings (1D), where a new approach is proposed to solve this class of problems. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6181 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6181/5233

oai:publicacoes.softaliza.com.br:article/6182 2024-07-10T10:58:13Z cilamce2020:ART

Transient hyperbolic analyses considering a fully adaptive explicit time- marching formulation Lucas Ruffo Pinto Delfim Soares Jr. Webe Joao Mansur Time-marching Explicit analysis Adaptive parameters This work presents an explicit formulation with adaptive time integrators, enhanced by sub-cycling, fortime domain analyses of hyperbolic models. The method is based on single-step displacement-velocity relations, describing a truly self-starting, easy to implement technique. Its stability limit is the same as of the central differ-ence method and it provides adaptive controllable numerical dissipation. Since the technique is explicit, it does not need to consider any solver routine, standing as a very efficient methodology. Subdomain decomposition pro-cedures, associated to multiple time-steps and sub-cycling, are also considered herein to improve the performance of the formulation. In this case, a generic methodology is discussed, in which subdomain divisions and local time-step values are automatically evaluated. At the end of the paper, numerical results are presented in comparison to those of the central difference method and the explicit generalized α method, illustrating the effectiveness of thediscussed approach. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6182 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6182/5234

oai:publicacoes.softaliza.com.br:article/6183 2024-07-10T10:58:13Z cilamce2020:ART

L-BFGS BASED LEAST-SQUARES REVERSE TIME MIGRATION FOR REFLECTIVITY IMAGING Kristian D. T. Bautista Franciane C. Peters Raphael V. M. de Souza Webe J. Mansur LSRTM L-BFGS Seismic Inversion Wave equation Assuming kinematic accuracy on the migration velocity model, seismic least-squares migration seeks toovercome the drawbacks of traditional migration algorithms by approximating the inverse imaging operator withina linear inversion framework. In this paper, we combine reverse-time migration and the L-BFGS optimizationmethod to iteratively reconstruct the true subsurface reflectivity model from seismic reflection measurements. Ineach iteration, the initial model is first demigrated using the Born approximation of the acoustic wave equation togenerate the predicted seismic data. Then, the reflectivity is updated by minimizing the least-squares misfit functionin the data domain. Furthermore, to speed up the convergence of the inversion algorithm, we preconditioned thegradient by the illumination compensation operator. Numerical examples demonstrate that, even in the presenceof salt bodies, the inverse operator of the imaging problem can be used to obtain improved migrated sections withreduced artifacts, better resolution, and reflectors with more balanced amplitudes. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6183 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6183/5235

oai:publicacoes.softaliza.com.br:article/6184 2024-07-10T10:58:13Z cilamce2020:ART

Enhancing Reverse Time Migration: Hybrid Parallelism plus Data Compression Carlos Henrique S. Barbosa Alvaro L. G. A. Coutinho Reverse Time Migration Data compression High-performance Computing Migration techniques like the Reverse Time Migration (RTM) are time-consuming and data-intensive.RTM is time-consuming due to the computational cost associated with the stability and dispersion conditions inthe discrete two-way wave equation. On the other hand, RTM is data-intensive because of the number of inputseismograms to be loaded and the need to store temporary files, such as the forward propagated wavefields, to buildthe migrated seismic images and partial migrated images before stacking. Thus, to overcome the time-consumingproblem, we implement a Reverse Time Migration algorithm that explores the Message Passing Interface (MPI)library and the OpenMP+vectorization to explore parallelism in hybrid architectures. On the other hand, weimplement compression techniques to reduce storage and to improve network data transfer. The data compressioncan be used to reduce the storage of seismograms, model parameters, migrated seismic images, and temporary files.Results show that an MPI/OpenMP+vectorization strategy is efficient in hybrid multi-core machines. Besides, highlevels of data compression suggest that its use does not hamper the final migrated seismic images. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6184 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6184/5236

oai:publicacoes.softaliza.com.br:article/6185 2024-07-10T10:58:13Z cilamce2020:ART

Finite Elements Method use for displacement calculus in trusses Chiquesi P. L. Amós Pegoretti dos S. Thaís FEM displacement trusses global matrix. The Finite Element Method (FEM) is a numerical procedure for analyzing structures andcontinuous media. It is a technique used to obtain approximate solutions of differential equations. Trusses arerigid elements whose definition is based on loads applied only to moorings (knots). This project proposes the useof the FEM in trusses in order to discover displacement values and the intensity of the tensile and compressionforces in each element of the structure. Initially, the bar was studied and implemented, then the beam. In thiswork, one example is presented to illustrate the application of the FEM, for the case of a static analysis of a truss,using one-dimensional bar elements including bibliographic results.The stiffness matrixes of each element arepresented and the global matrix assembly is developed. To compare the results of the example with a simulation,oneFtool® model is constructed and both results are compared. This project is able to expand the student'sunderstanding of FEM, modelling and results interpretation. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6185 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6185/5237

oai:publicacoes.softaliza.com.br:article/6186 2024-07-10T10:58:13Z cilamce2020:ART

Reliability assessment of existing transmission line towers considering mechanical model uncertainties Rafael R. de Souza Leandro F. Miguel Rafael H. Lopez Joao Kaminski-Jr Fabio Alminhana Joel V. Pimenta Transmission line towers bolt slippage effect reliability Recent studies have shown the importance of the bolt slippage effect on the structural behavior oftransmission line (TL) towers (CIGRE-187 (2009), Ramalingam e Jayachandran (2016), Jiang et al. (2017), justto name a few). However, these effects are not included among the studies regarding the structural reliability ofthese structures considering model uncertainties. Additionally, the bolt slippage effect has also been disregardedin the structural design, which is carried out through commercial computational packages that employ a linear orgeometrically nonlinear elastic analysis. Moreover, the magnitude of these effects is highly dependent on the towertopology, a definition influenced by the engineer experience. Thus, neglecting those effects can lead to a wrongchoice of topology configuration. In these cases, the tower elements that are originally designed to resist to axialforces determined through structural analysis procedures that do not include the bolt slippage effect, indeed, can beactually subjected to higher values due to this inaccurate modeling (i.e., they present smaller cross sections thatthey should have). This fact is even more relevant when old structures are considered, which were designed whenstudies on this subject were not well established. Consequently, these structures are especially prone to presenttopologies which increases the influence of the bolt slippage effect, resulting on a structural behavior further awayfrom a linear elastic hypothesis, originally employed on its design. Therefore, given the high number of old towersstill operating in Brazil and its relevance for the entire electric system, the main goal of this paper is to assess thestructural reliability of existing transmission towers considering mechanical model uncertainties, on a design region(for pre-collapse loads). For this, the behavior of the connections and modeling assumptions are be considered asuncertainties. Thus, allowing, for example, to analyze the reliability of these structures considering different levelsof modeling complexity. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6186 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6186/5238

oai:publicacoes.softaliza.com.br:article/6187 2024-07-10T10:58:13Z cilamce2020:ART

Comparative analysis between the shear resistance of the Truss Type shear connector and stud bolt Jerfson M. Lima Luciano M. Bezerra Jorge Bonilla Composite steel-concrete structures Truss Type shear connector Finite element analysis Shear connectors are extremely important in the functioning of composite steel-concrete structures, asthey are responsible for carrying out the transmission of forces between the steel beam and the concrete slab. TheTruss Type shear connector is an alternative connector that aligns efficient structural behavior, agility of executionand low cost of production when compared to conventional shear connectors (stud bolt, for example) applied incomposite structures. However, due to the short time of existence, there is still a lack regarding the understandingof the mechanical behavior of the Truss Type connector. Thus, this study aims to perform a comparative analysisbetween the shear resistance of the Truss Type connector and stud bolt. This study was conducted from thedevelopment of a non-linear three-dimensional finite element numerical model for simulating push-out tests withTruss Type connector. The results showed that the Truss Type connector has a strong capacity and a higherload/cross section ratio than stud bolt, even when manufactured with materials with identical properties. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6187 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6187/5239

oai:publicacoes.softaliza.com.br:article/6188 2024-07-10T10:58:13Z cilamce2020:ART

Theoretical and experimental study of the behavior of composite beam-columns using double I section filled with reinforced concrete Larissa Macedo Rosa Silva Rodrigo Pompermayer Soares Sebastião Arthur Lopes de Andrade composite structures composite columns experimental study computational analysis Composite beam-columns are cost-effective structural systems for buildings and warehouses. They canbe pre-cast with reduced formwork or can be cast in-place in order to reduce crane usage. This paper reports thestructural behaviour of a pre-fabricated composite system based on a theoretical and experimental study. Thestructural model is composed of a double rolled I section constituting a built-up member by means of I-sectionweb connectors, then filled with reinforced concrete. A theoretical study based on linear and nonlinear staticanalysis through the Finite Element Method was carried using ABAQUS software. Based on this study, anexperimental programme was developed to test full-scale members submitted to flexural tests in order to validatethe numerical results. The experimental results were compared to the numerical results and the designrecommendations of Brazilian standard. Lastly, the economic conditions for the implementation of the systemwere evaluated and the structural efficiency was analysed for an industrialized construction method. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6188 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6188/5240

oai:publicacoes.softaliza.com.br:article/6189 2024-07-10T10:58:13Z cilamce2020:ART

NUMERICAL ANALYSIS OF THE BEHAVIOR OF CONCRETE COLUMNS CONFINED WITH CFRP USING THE CONSTITUTIVE MODEL CONCRETE DAMAGED PLASTICITY Matheus de Santana Santos Tereza Denyse Pereira de Araujo Column reinforcement Carbon fiber reinforced polymers Confinement Concrete damaged plasticity Numerical analysis The use of carbon fiber reinforced polymers (CFRP) in the reinforcement of concrete structures wasconsolidated in civil construction due to its excellent mechanical properties and low specific weight. In this context,this article aims to present numerical simulations in finite elements of columns reinforced externally to the CFRP,submitted to centralized compression. The simulations were developed considering the physical non-linearity ofthe concrete through the constitutive model Concrete Damaged Plasticity (CDP), based on plasticity and damageto the material. The numerical models were calibrated with data from experimental tests and indicated goodcompatibility of forces and axial displacements. The distribution of the compression stresses indicated that forthe case of centered force the circular columns present uniform confinement, while in the prismatic columns theconfinement is concentrated close to the rounded corners. The reinforcement efficiency in the resistance gain fordifferent column cross sections was proven. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6189 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6189/5241

oai:publicacoes.softaliza.com.br:article/6190 2024-07-10T10:58:13Z cilamce2020:ART

Numerical simulation of full-scale tests in transmission line towers Rafael R. Roman Leandro F. F. Miguel Fabio Alminhana Joel Pimenta Nonlinear analysis Transmission line towers Prototype testing Steel structures Transmission line towers are structures designed to carry electrical energy from generating stationsto consuming centers. Full-scale tests are traditionally employed in designing verification of transmission linelattice tower structures. Due to the cost of these tests, an alternative is to evaluate their structural behavior usingnumerical methods. In the present work, a nonlinear analysis method is presented for predicting the ultimatestructural response of two steel lattice towers under static load conditions. In the proposed technique, each toweris modeled as an assembly of beam-column elements. The solution scheme consists of an incremental-iterativepredictor-corrector strategy based on the arc-length method. Linear, geometric and plastic matrices are used todescribe the structure behavior in an updated Lagrangean framework. A lumped plasticity approach coupled withthe concept of yield surfaces and plastic hinges is adopted for modelling material nonlinearity. Based on the results,it was verified that the proposed model can produce accurate results to simulate load and failure modes of steellattice towers. However, some inaccuracies may arise in predicting the collapse load when failure occurs due toelastoplastic buckling of the members. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6190 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6190/5242

oai:publicacoes.softaliza.com.br:article/6191 2024-07-10T10:58:13Z cilamce2020:ART

Influence of distance between outer tubes in bolted sleeve connections under compression Matheus Miranda de Oliveira Ellen Caroline Rezende Neto Raissa de Oliveira Simão Lucas Roquete Ellen Martins Xavier Arlene Maria Cunha Sarmanho Vinicius Nicchio Alves sleeve connections numerical analysis bolted connections circular hollow sections steel structures The sleeve connection with circular hollow sections(CHS) allows a harmony in the continuity of tubularprofiles, becoming a discreet connection in the real structure and contributing to a new aesthetic identity forconnections between these steel profiles. This connection was proposed to facilitate the execution andmaintenance, reduce costs and enable other projects of the structures formed by CHS. This work presents anumerical study about the influence of distance between outer tubes in sleeve connections, with aligned bolts,under compression. Possible failure modes and the values necessary for the efficient operation of the connectionwithout the possibility of outer tubes touching, changing the behavior of the connection, were evaluated. The studywas carried out by a numerical analysis using the finite element method (FEM) in a commercial software, allowingthe geometric parameters variations. With the study results, it was possible to evaluate the behavior of sleeveconnection and to define a minimum distance between the outer tubes, contributing to the dimensioning andassembly of the connection in truss systems. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6191 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6191/5243

oai:publicacoes.softaliza.com.br:article/6192 2024-07-10T10:58:13Z cilamce2020:ART

ESTUDO DO COMPORTAMENTO ESTRUTURAL DE VIGAS CASTELADAS DE AÇO EM PADRÃO LITZKA COM ABERTURAS HEXAGONAIS E OCTOGONAIS Manuella M. de Lima Washington B. Vieira André L. R. Brandão castellated beams numerical modeling finite element method Castellated steel beams (CSB) are manufactured from the zigzag cut of the web of the I-sections, whosehalves are displaced and welded, making the beam expand in height, without changing the profile mass. Changingdimensional cutting parameters makes it possible to create several geometric patterns of castellated beams. Thestudy in question addresses the addition of expansion plates to the Litzka CSB, further increasing the height of theprofile, and consequently the moment of inertia and the stiffness of the section, thus enabling the execution oflarger spans. The CSB has an architectural and functional appeal, due to their light appearance and the possibilityof passing ducts through the alveoli. In order to compare the results obtained, the cross section was varied, rangingbetween supports, types of loading and the size of the expansion plate for performing numerical analysis using thefinite element method. The numerical model considers the initial geometric imperfections, residual stress andphysical nonlinearities derived from the manufacturing process. The results show the comparison of the structuralbehavior and the resistant capacity of CSB with different characteristics. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6192 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6192/5244

oai:publicacoes.softaliza.com.br:article/6193 2024-07-10T10:58:13Z cilamce2020:ART

RECON: PROGRAM IN PYTHON FOR CALCULATING REINFORCED CONCRETE BEAMS Joao Vítor Jesus Janaina Gomide Esdras Oliveira Structural analysis Python Reinforced concrete Educational tool The utilization of programs for making structural analysis of reinforced concrete is usual in civil en-gineering. Structural analysis is a fundamental step in buildings project where internal forces, dimensions and structural members design are defined, such as beams, columns and slabs. The used parameters, as well as the considerations and equations are specified at the ABNT NBR 6118/2014 – “Design of concrete structures — Pro-cedure”. The goal of this paper is to present ReCon1 , a Web application for calculating reinforced concrete beams. It was made to perform the design according to the specifications of the Brazilian standard. It has a friendly inter-face and it brings two advantages: it is free and open-source and was designed also to be used as an educational tool. The achievements obtained by ReCon have been compared to some examples of already solved exercisesin the current literature about reinforced concrete. These comparisons have shown excellent results which proveReCon as trustful program. Moreover, students of civil engineering have used ReCon in order to compare theirsexperience solving exercises using this program to what they usually do in class. They have mentioned about thefriendly interface and found a good educational tool to add in class. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6193 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6193/5245

oai:publicacoes.softaliza.com.br:article/6194 2024-07-10T10:58:13Z cilamce2020:ART

A comprehensive model of fatigue for steel beams Deborah C. Nardi Yongtao Bai Ricardo A. Picón Julio Flórez-López ultralow and low cycle fatigue high and ultrahigh cycle fatigue lumped damage mechanics Steel beams may be subjected to cyclic loads and consequently damaged by the fatigue phenomena.Concerning to identify and to monitor the crack initiation, the crack evolution and the subsequent failure of thisstructures, in this paper it is proposed a model that allows the study of the fatigue phenomena, either for ultralowand low cycles and high and ultrahigh cycles, considering both stationary and non-stationary fatigues. A new statevariable for the identification of the beginning of the crack propagation is introduced for each plastic hinge, whichis called the pre-damage variable. Its evolution law is based on Manson-Coffin law and also on the Basquin law.Fundamental concepts of the Lumped Damage Mechanics (LDM) are also included. It allows the consideration ofthe damage variable itself and its influence in the constitutive relationships. A new damage law is settled and takesinto consideration effects from both different types of fatigues. Appropriately, the crack closure effect is usedthrough the unilateral damage assumption. Finally, the accuracy of the model is its validation is done by a finiteelement analysis (FEA) to predict the experimental behavior of tests of steel beam-column that are available in theliterature. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6194 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6194/5246

oai:publicacoes.softaliza.com.br:article/6195 2024-07-10T10:58:13Z cilamce2020:ART

An elastoplastic model with damage based on the Thermodynamics of Frames Deborah C. Nardi Julio Flórez-López Ricardo A. Picón thermodynamics of frames reinforced concrete cracking evolution lumped damage mechanics The representation of the mechanical behavior of reinforced concrete structures aims to describe thephysical reality as accurately as possible, which for there are many available theories. Besides that, to go furtherin those researches of physical representation, there are postulated formulations based on the science ofthermodynamics, which link the influence of mechanical behavior in the development of physical phenomena andvice versa, through a systematic procedure that allows the determination of thermodynamic forces associated withthe state variables, which are able to represent these phenomena. Therefore, the model here presented isunderpinned on thermodynamic models that describe physical phenomena of reinforced concrete structures andproposes a new damage law that allows the observation of the cracking evolution. A new cracking resistancefunction that describes the energy release rate during the damage evolution is established since this new damagelaw comes now from Gibbs Free Energy. Finally, in order to evaluate the accuracy of the new model, the resultsobtained by the proposed model are compared with those given by the Lumped Damage Mechanics theory, whichpresents itself as an efficient tool to describe the cracking appearance and evolution, for both analysis andcomputational implementation. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6195 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6195/5247

oai:publicacoes.softaliza.com.br:article/6197 2024-07-10T10:58:13Z cilamce2020:ART

Numerical analysis of compressed end-flattened steel bars of three- dimensional trusses Henrique de A. R. Cruz Welington V. da Silva Luciano M. Bezerra end-flattened steel bar three-dimensional truss steel structures stress field On the field of steel structures, one of the most commonly used types of structural systems is thethree-dimensional truss. It is applied in a wide range of sizes and shapes, with its constituent elements usuallyprescribed as hollow circular cross-section bars. In order to assemble them in a practical and efficient way, onealternative often chosen by designers is to flatten their ends and attach these bars in bolted connections.Although such constructive method has notorious advantages and is already present in a large number ofengineering projects in different countries, it is still necessary to conduct more studies that analyze its singularstructural behavior and thereby contribute to the establishment of forthcoming normative criteria. In this sense,this work presents an association of numerical analysis and empirical data of an example of end-flattened steelbar, especially regarding the variation of the stress field developed along the structure subjected to differentlevels of load. The results obtained provide a better understanding of the consequences of the reduction ofstiffness due to the flattening process of the bar ends. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6197 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6197/5248

oai:publicacoes.softaliza.com.br:article/6198 2024-07-10T10:58:13Z cilamce2020:ART

Estabilidade de edifícios de múltiplos andares em aço: uma comparação entre metodologias de análise Rafael Eclache Moreira de Camargo José Jairo de Sáles edifícios em aço estabilidade estrutural análise de segunda ordem análise estrutural Este trabalho apresenta uma análise comparativa dos efeitos de segunda ordem em um edifício de 20pavimentos. O modelo apresentado foi dimensionado pelos princípios do método da análise direta, presente naABNT NBR 8800:2008. O método da amplificação dos esforços solicitantes (MAES) foi usado para se obter osesforços atuantes nos elementos do edifício considerando os efeitos locais e globais de segunda ordem. Aincidência do vento foi simulada sem e com excentricidade devida aos efeitos de vizinhança, de acordo com aABNT NBR 6123:1988. Todas as análises numéricas foram repetidas usando o método simplificado de segundaordem conhecido como P-Delta. Por meio dos resultados obtidos, foi observado que os esforços solicitantesdeterminados pelo método P-Delta ficaram bastante semelhantes àqueles calculados pelo MAES, com desviosdesprezíveis. O MAES, por sua vez, mostrou-se bastante trabalhoso, pois exige a modelagem de diferentes tiposde estruturas para a determinação dos esforços. No que diz respeito aos efeitos de vizinhança, observou-se que suamaior influência está no aumento dos momentos fletores e dos deslocamentos da estrutura. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6198 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6198/5249

oai:publicacoes.softaliza.com.br:article/6199 2024-07-10T10:58:13Z cilamce2020:ART

Estudo numérico do efeito Shear Lag em perfis de aço com seção transversal do tipo U Jorge Fernando Reis Bernardo de Matos Silva Melo Rodrigo Barreto Caldas Ana Lydia Reis de Castro Silva Hermes Carvalho shear lag estruturas de aço seção transversal U Barras de aço tracionadas são amplamente empregadas em sistemas estruturais, tais como treliças decobertura, torres de transmissão, sistemas de contraventamento e outros. Dentre os perfis mais utilizados, tem-seo tipo U, que pode ser conectado por meio de uma ou mais partes da seção transversal, por exemplo, conexão apartir do elemento da alma. Nesses casos, a distribuição de tensões se torna não uniforme ao longo da seção doperfil, tendo maior intensidade nas regiões conectadas. O efeito proveniente da concentração dessas tensões emuma área reduzida é conhecido como shear lag e tem como consequência a redução na capacidade resistente. Esseefeito é contemplado pelas normas ABNT NBR 8800:2008, ANSI/AISC 360-16 e EN 1993-1-1:2005 comsimplificações gerais. Na literatura encontram-se estudos mais abrangentes para perfis cantoneira e ligaçõesparafusadas. Sendo assim, realizou-se um estudo numérico por meio do método dos elementos finitos (MEF) deligações de perfis U tracionados com ligações soldadas, considerando a influência da presença ou não de soldatransversal em conjunto com a longitudinal, comprimento da barra e da ligação para seções com geometriasdiferentes. Os resultados foram confrontados com a literatura, indicando comportamento menos conservador dosmodelos. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6199 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6199/5250

oai:publicacoes.softaliza.com.br:article/6200 2024-07-10T10:58:13Z cilamce2020:ART

A numerical methodology for the cross-sections analysis of steel-concrete composite beams with partial shear connection ́Igor J.M. Lemes Tawany A. Carvalho Bruno M. Siciliano Rafael C, Barros Rodrigo B. Caldas Ricardo A.M. Silveira Partial shear connection Steel-concrete composite beams SCM Moment-curvature relationship The present work aims at the implementation and validation of a numerical formulation based on theStrain Compatibility Method (SCM) for the calculus of the cross-section’s resistance capacity of steel-concretecomposite beams with partial shear connection. It is developed, here, a strategy for capturing the longitudinaldeformations at all cross-section’s points. Thus, the section’s discretization, isolating the steel profile from theconcrete slab, is necessary. In this context, the classic SCM is modified by the insertion of one explicit degree offreedom at the steel-concrete interface, corresponding to a discontinuity on the deformations field, allowing thelongitudinal sliding between the steel profile and the concrete slab. Therefore, the axial force dismemberment isdone, on which a part is absorbed by the profile and the other part by the slab. By equilibrium, the differencebetween the slab’s and profile’s forces generates a shear force at the connection and, using the Ollgaard’s model,the longitudinal sliding at the contact point, is found. Assuming the plane cross-section theory, a single curvatureis assigned to both constituents of the section. Thereby, it is done the construction of the moment-curvaturerelationship using the standard Newton-Raphson method combined with continuation strategies aiming to capturethe hardening and softening of the materials over the loading historic of the section. However, in order to implementthe analysis, exclusively, in the cross-section, a fixed degree of freedom is assigned to it. For the validation of theproposed numerical formulation, the obtained results are confronted with numerical data available in the literature. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6200 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6200/5251

oai:publicacoes.softaliza.com.br:article/6201 2024-07-10T10:58:13Z cilamce2020:ART

Concentrated plasticity-based second order formulation for analysis of semirigid steel-concrete composite frames and beams with partial shear connection ́Igor J.M. Lemes Tawany A. Carvalho Luís E.S. Dias Ricardo A.M. Silveira Amilton R. Silva Second-order effects Semi-rigid connections Partial shear connection Concentrated plasticity Steel- concrete composite frames The present work aims at the implementation and validation of a displacement-based two-dimensionalnumerical formulation including several sources of non-linearities in steel-concrete composite frames, such as:second order effects; plasticity; beam-to-column semi-rigid connections; and partial shear connection on beams.The finite element method is used together with the co-rotational approach in order to allow large displacementsand rotations in the numerical model. The degradation of axial and flexural stiffness is determined exclusively atthe nodal points of the finite element mesh, characterizing the concentrated plasticity. In cross sections, the StrainCompatibility Method (SCM) is used to capture the axial strains in the components of the section and also theslip in the steel-concrete interface. Sliding is considered by introducing a degree of freedom at the steel-concreteinterface in the analysis of the cross section. In this way, the constitutive models of the materials and the shearconnection elements are described by continuous functions. The semi-rigid connections are simulated by meansof zero-length pseudo springs that are introduced at the finite elements ends, making them hybrid. To validate theproposed numerical formulation, the results obtained are compared with numerical and experimental data availablein the literature. Since the model proposed here starts from the concentrated simulation of nonlinear effects, a studyof the finite element mesh refinement is also carried out. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6201 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6201/5252

oai:publicacoes.softaliza.com.br:article/6202 2024-07-10T10:58:13Z cilamce2020:ART

Non-linear analysis of steel-concrete composite frames via RPHM consid- ering cracking and partial shear connection Pedro H.A. Lima Tawany A. Carvalho ́Igor J.M. Lemes Rafael C. Barros Ricardo A.M. Silveira Second-order effects Partial shear connection Concentrated plasticity Steel-concrete composite frames Interaction curves The present work aims at the implementation and validation of a two-dimensional numerical formulationfor the simulation of steel-concrete composite frames. Geometric and material nonlinearities are considered. Acorotational approach is used to simulate second order effects. In the case of material nonlinearity, zero-lengthpseudo springs are used at the finite elements ends, where the gradual loss of flexural stiffness is determined by thecombination of normal and flexural efforts (NM) at the nodal points, exclusively. The limits of the non-cracked,elastic and plastic regimes of the section are made in the NM interaction diagram. This diagram is obtained fromthe Strain Compatibility Method (SCM), where the non-linear analysis of the cross section is made. The crackingof the concrete is explicitly simulated with the effective moment of inertia proposed by NBR 6118 (2014). Forsteel-concrete composite beams, the possibility of longitudinal sliding between the concrete slab and the steelprofile is considered, with the degradation of inertia being addressed as prescribed in NBR 8800 (2008). Theresults obtained are compared with numerical and experimental data available in the literature. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6202 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6202/5253

oai:publicacoes.softaliza.com.br:article/6203 2024-07-10T10:58:13Z cilamce2020:ART

Numerical study of thermal-mechanical behavior of 2D composite steel-concrete frames Rafael C. Barros Dalilah Pires Ricardo A.M. Silveira Ígor J.M. Lemes composite frames fire situation thermal-structural analysis CS-ASA RPHM/MCD coupling The purpose of this study is to apply the advanced numerical methodology developed and implementedin the CS-ASA/FA (Computational System for Advanced Structural Analysis/Fire Analysis) and CS-ASA/FSA(Fire Structural Analysis) to understand the thermal-mechanical behavior of 2D composite steel-concrete framesin fire situation. The analysis is carried out on two-level approaches, the first referring to the structural elementcross-section. In this step, the temperature field is calculated using a transient heat transfer model, from where the degradation of stiffness and strength parameters are obtained when the materials are exposed to fire. The second-level stage is related to inelastic second order analysis (ISOA) of the composite steel-concrete structural system under high temperatures. In the ISOA context via finite element method (FEM), a co-rotational formulation is usedto follow the large displacements and rotations of the structural model, and the material elasto-plastic behavior issimulated through the Refined Plastic Hinge Method (RPHM) and Strain Compatibility Method (SCM) coupling.Finally, the structural modeling studied seeks to validate the proposed numerical strategy using the results foundin literature. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6203 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6203/5254

oai:publicacoes.softaliza.com.br:article/6204 2024-07-10T10:58:13Z cilamce2020:ART

Advanced numerical analysis of shallow and deep steel arches under fire condition Rafael C. Barros Ricardo A.M. Silveira Dalilah Pires Lidiane R.R.M. Deus Lidiane R.R.M. Deus Jackson S. Rocha Segundo Luís H.A.A. Queiroz Steel arches Fire situation Thermal-structural analysis CS-ASA/FSA RPHM/MCD coupling The arches are structures used to overcome large spans, since their curvature can guarantee strengthgains. However, such systems exhibit strongly nonlinear behavior, and therefore, for a more realistic modeling, itis necessary that numerical formulations consider several sources of nonlinearity, such as geometric and material.In a fire situation, the analysis is usually more complex, since the materials physical and mechanical properties aresignificantly affected by temperature. Therefore, this work aims to study the thermal-mechanical behavior ofshallow and deep steel arches under high temperatures using the CS-ASA/FSA module (Computational Systemfor Advanced Structural Analysis/Fire Structural Analysis). Basically, the analysis will be developed in two-levelapproaches: the first refers to the temperature field calculation in any cross-section, where, as consequence of fireexposition, the materials properties degradation are obtained; the second stage is intended to carry out an inelasticsecond order analysis (ISOA) of shallow and deep steel arch in a fire situation. A co-rotational finite elementformulation is used to follow the large displacements and rotations of the structural model, and the materialinelastic behavior is simulated with the Refined Plastic Hinge Method (RPHM) and Strain Compatibility Method(SCM) coupling. The numerical thermal-structural results obtained here will be validated by comparison withresponses available in the literature. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6204 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6204/5255

oai:publicacoes.softaliza.com.br:article/6205 2024-07-10T10:58:13Z cilamce2020:ART

Simulação numérica de uma estrutura tridimensional considerando a interação solo-estrutura Patricia Grezelle Francisco A. A. Gomes Paôla R. Dalcanal Haridasa F. Carvalho Paulo R. Novak Giovanni Bratti soil-structure interaction coupling problems finite element method dynamic analysis The dynamic behavior in the study of Soil-Structure Interaction (SSI) has attracted intense interestamong researchers and engineers from diverse areas, as it is a fundamental principle to ensure the safety andstructural stability of buildings that are increasingly slender and flexible. However, problems associated with thepractical application of SSI are harmed by complex literature, in addition to codes and standards with limitedguidelines and practical examples with scarce applications. Thus, the present study proposes to numericallyanalyze the SSI of a three-dimensional (3D) structure based on the modal response. The model is discretized in anequivalent mass-spring-dampener system, the structure is a system of concentrated masses and soil represented bya system of springs and dampeners calculated through impedance coefficients. Posteriorly, the geometry ismodeled and the SSI is coupled with the structure receiving excitation from the base. For such, the finite elementmethod and the ANSYS software are used. The results showed the vibration modes and the harmonic and transientresponse of the structure with the greatest displacement occurred on the third floor at a frequency of 1.1417 Hz.Therefore, the study made possible to identify the dynamic behavior of the structure before external action at thebase. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6205 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6205/5256

oai:publicacoes.softaliza.com.br:article/6206 2024-07-10T10:58:13Z cilamce2020:ART

Dynamic analysis of highway bridges considering a progressive pavement deterioration model Ana Célia Soares da Silva Vencislau Manuel Quissanga José Guilherme Santos da Silva highway bridges dynamic structural analysis irregular pavement surface Highway bridges are subjected to random traffic loads along their lifecycle and also subjected torelevant impact dynamic loadings. The road-roughness of asphalt pavements represents a key issue to thesignificant increase of the displacement and stress values on the highway bridge decks. Considering this fact, theaim of this research work is to develop an analysis methodology to evaluate the displacement and stress valuesof a steel-concrete composite highway bridge, including the dynamic actions due to vehicles convoy and also theeffect of the progressive deterioration of the pavement, taking into account the road surface damages. Theanalyzed structural model corresponds to a typical steel-concrete composite highway bridge deck, with straightaxis, simple supported and spanning 13.0m by 40.0m. In this investigation, the numerical model developed forthe dynamic analysis of the steel-concrete composite bridge, adopted the usual mesh refinement techniquespresent in Finite Element Method (FEM) simulations implemented in the ANSYS computational program. Themain conclusions of this study focused on alerting structural engineers to the significant distortions associated tothe bridge dynamic structural response, when subjected to dynamic actions produced by vehicles convoys on theirregular pavement surface. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6206 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6206/5257

oai:publicacoes.softaliza.com.br:article/6207 2024-07-10T10:58:13Z cilamce2020:ART

Human-induced vibration analysis and human comfort assessment of pedestrian footbridges Irwing Aguiar Ribeiro da Silva José Guilherme Santos da Silva Pedestrian footbridges Biodynamic models Dynamic structural analysis The design of pedestrian footbridges has always been challenging. Essentially, this type of structurepresents long spans and, due to more resistant materials, the structural elements slenderness has beenconsiderably increased. Consequently, the excessive vibration problems become more evident and may causediscomfort to the pedestrians or even structural risk. Therefore, aiming to predict the dynamic structural responseof footbridges induced by human walking, two mathematical models were used: single force model andbiodynamic models. Based on the use of the two loading models, an extensive parametric study was carried outconsidering the pedestrian step frequencies, the pedestrian-footbridge mass ratios and the structural dampingrate. The results obtained along this investigation shows that the influence of the human walking depends on therelationship between the mass of the pedestrians and the footbridge, and the pedestrian-footbridge dynamicinteraction effect can be irrelevant for small mass ratios. On the other hand, the human walking can, without anydoubt, provoke higher dynamic structural responses, especially when the footbridge fundamental frequency isclose to the pedestrian step frequencies’ range. In this situation, the structural system can reach high vibrationlevels that can compromise the footbridge user’s comfort. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6207 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6207/5258

oai:publicacoes.softaliza.com.br:article/6208 2024-07-10T10:58:13Z cilamce2020:ART

Dynamic structural analysis and fatigue assessment of wind turbine towers Rodrigo Guedes. Simões Leandro Rocha Machado de Oliveira José Guilherme Santos da Silva Steel wind tower nondeterministic wind dynamic loads numerical modelling fatigue verification The wind energy has been very promising because it is inexhaustible energy of low environmentalimpact. Based on the increasing demand on renewable and clean energy, the wind turbine design has advancedsignificantly in terms of its size and type. In Brazil, considering this advance, the conventional conical steeltower is a predominant type of supporting structure. Proper consideration of all the aspects before mentionedpointed out our team to develop an analysis methodology with emphasis to evaluate the stresses through adynamic structural analysis of a typical wind turbine supporting steel tower, including the nondeterministic windactions. Thus, this research works aims to study the dynamic non-deterministic structural response and evaluatethe service life of a steel tower to be used as a support for a wind turbine model type MM-92 from Repower. Inthis investigation, the numerical model developed for the structural analysis of the tower adopted the usual meshrefinement techniques present in Finite Element Method (FEM) simulations and implemented in the ANSYSprogram. The analysis of the non-deterministic dynamic response of the tower is performed for several windvelocities, having in mind a critical evaluation about the maximum values obtained for the Von Mises's stressesand the service life of the investigated structure. Finally, the results obtained along this study are evaluated andcompared with the limit values recommended by international design codes and recommendations. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6208 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6208/5259

oai:publicacoes.softaliza.com.br:article/6209 2024-07-10T10:58:13Z cilamce2020:ART

Structural integrity assessment of storage tanks based on damaged surface reconstruction and finite element modelling Matheus Abreu Lopes Francisco José da Cunha Pires Soeiro José Guilherme Santos da Silva Storage tanks Finite element modelling Integrity assessment This research paper aims to discuss an analysis methodology developed for structural integrityassessment of storage tanks. Such methodology is based on the assessment of the damaged structure, consideringthe pre-deformed geometry, via stresses analysis. Then, a finite element model is generated, based on thedeformed surface of the structural system, through laser scanning technology. This way, it is possible to detectthe real geometry that explicitly includes the damages present on the studied storage tank. This way in this work,a real case study is investigated having in mind an Atmospheric Storage Tank (AST) located in an industrialfloor related to the oil and gas industry. The equipment object of this analysis presents a cylindrical geometrywith approximately 45 m diameter and a 14.63 m height and is utilized for diesel oil storage. The storage tank presents deformations on its shell (cylindrical surface of the structure), and in order to evaluate its Fitness-For-Service (FFS), i.e. evaluate whether the equipment is suitable to continue in operation, with existing damages, a laser scanning was performed on the storage tank shell. In sequence, the stresses analysis methodology providedby API (American Petroleum Institute) design codes was adopted to the assessment of the structural response.The results obtained along this research work show that the developed analysis methodology used for theevaluation of the damaged storage tank is very effective and also can reduce maintenance costs as well as lossesdue to the time that the structure needs to be out-of-operation. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6209 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6209/5260

oai:publicacoes.softaliza.com.br:article/6210 2024-07-10T10:58:13Z cilamce2020:ART

Dynamic experimental monitoring and numerical analysis of floors subjected to human activities Felipe A. de Sousa Jefferson V. Aguiar Nathalia de A. C. Branco José Guilherme Santos da Silva Reinforced concrete floors Dynamic experimental monitoring Human comfort The present work aims to evaluate the dynamic structural behaviour of a reinforced concrete floorlocated on the eighth story of the State University of Rio de Janeiro (UERJ). The investigated floor is currentlyused for rhythmic human activities (gym activities). In some situations, such rhythmic activities produce a highdegree of synchronization, which on some occasions can stimulate high levels of vibrations that may causediscomfort to the users. This way, the investigated structural model consists of a reinforced concrete floor withdimensions of 16 m by 35 m and total area of 560 m2. Initially, a dynamic experimental monitoring of the floorwas performed aiming to determine the dynamical properties (natural frequencies and structural damping). Afterthat, a numerical model was developed to represent the studied floor, based on the use of usual mesh refinementtechniques present in the Finite Element Method (FEM) simulations and implemented in ANSYS program. Insequence, the experimental and numerical dynamic structural responses were compared and the finite elementmodel of the reinforced concrete floor was properly calibrated. Finally, the floor was subjected to rhythmichuman activities (gym activities) and the dynamic response was investigated based on the use of biodynamicmodels. The current outcome of this research paper enabled a complete structural dynamic assessment of theconcrete floor in terms of human comfort and its associated vibration serviceability limit states. The results showthe relevance of the dynamic analysis in the structural design of buildings, considering the human activities thattake place and influence the structure. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6210 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6210/5261

oai:publicacoes.softaliza.com.br:article/6211 2024-07-10T10:58:13Z cilamce2020:ART

Assessment of the human comfort of steel-concrete composite floors Jefferson Viana Aguiar Bárbara Elisa Ferreira Hermes Carvalho José Guilherme Santos da Silva Steel-concrete composite floors Dynamic structural analysis Human comfort assessment This research work aims to investigate the dynamic structural response of steel-concrete compositefloors from the point of view of human comfort, when subjected to human walking. This way, the investigatedstructural model is associated to a steel-concrete composite floor building which is composed of a hot-rolledframing system, with a total area equal to 1300 m2. The floor system is used for normal school occupancy and issupported by steel-concrete composite columns with a ceiling height of 3.40m. The proposed numerical model,developed for the floor building dynamic analysis, adopted the usual mesh refinement techniques present in theFinite Element Method (FEM) simulations and implemented in the ANSYS program. In this numerical model,the steel-concrete composite floor girders were represented by three-dimensional beam elements, where flexuraland torsion effects are considered. On the other hand, the concrete slab was represented by shell finite elements.Both materials (steel and concrete) present an elastic behavior. The complete interaction between the concreteslab and steel beams was considered in the analysis, i.e., the finite element model coupled all the nodes betweenthe steel beams and concrete slabs, in order to prevent the occurrence of any slip. Regarding the structural behavior of the connections present in the investigated structure, the beam-to-beam connections and the beam-to-column connections were considered as rigid joints. After that, having in mind to determine if the investigated floor framing system satisfies the human comfort criterion for walking vibration, the dynamic structural responseof the investigated floor was analysed based on the peak accelerations values. These values were calculated andclassified according to several human comfort criteria, considering situations of the current design practice. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6211 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6211/5262

oai:publicacoes.softaliza.com.br:article/6212 2024-07-10T10:58:13Z cilamce2020:ART

Fixed offshore platform: assessment on the possibility of reuse of the jackets for offshore wind farms Vencislau Manuel Quissanga José Guilherme Santos da Silva fixed offshore platform offshore wind farms finite element modelling This paper focuses on the possibility of reusing (or not) a fixed offshore platform, with the purpose tounderstand whether the removal of the deck from the platform (partial decommissioning) would be consideredincluding the replacement for a wind tower. Thus, the present research aims to verify the structural behaviour ofa fixed offshore platform (jacket) when subjected to the loading of a 10 MW wind tower. However, in additionto the static loading coming from the wind tower, the environmental forces (variable loads) related to the wavesand wind acting on the platform were pondered. The loading related to the 10MW wind tower was consideredand distributed on top of the four legs of the jacket. The investigated structural system presents a 26 m heightjacket (from the mudline); the lower area presents dimensions of 9.97 m x 9.97 m and the upper area 6.10 m x6.10 m. The structure presents eight legs and three deck elevations between the upper and lower deck. Thenumerical model was developed based on the use of the SACS V12.0 computational software, and via the use ofthe Finite Element Method (MEF). Therefore, the resistance analysis is performed on the fixed offshore platform(jacket) considering the influence of the static and variable loadings in order to assess the current structuralbehaviour. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6212 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6212/5263

oai:publicacoes.softaliza.com.br:article/6213 2024-07-10T10:58:13Z cilamce2020:ART

Human comfort assessment of buildings considering the modelling of masonry infills and the soil-structure effect Jean Carlos Mota Silva José Guilherme Santos da Silva High buildings Modelling of masonry infills Soil-structure effect In the last decades, the urban verticalization in Brazil has been remarkable, and even in medium-sizedcities, the project and construction of high buildings is growing exponentially. However, the architectural darenessand also the increasing in the building project’s slenderness have been crucial to reducing the natural frequencyvalues of these structures, and in some situations, these facts could induce excessive vibration problems. On theother hand, important aspects, generally disregarded in the current design practice are related to the effects of themasonry infills and the soil-structure interaction. This way, this research work aims to develop an analysismethodology aiming to evaluate the structural behaviour and assess the human comfort of buildings subjected to the wind nondeterministic dynamic actions, including in the analysis the effects of the masonry infills and the soil-structure interaction. This way, the dynamic structural behaviour of a 16-storey reinforced concrete building, 48 m high and dimensions of 15.0 m by 14.2 m is investigated. Thus, numerical models were developed to obtain amore realistic representation of the system, based on the Finite Element Method (FEM), through the use of theANSYS program. The results obtained along this investigation have indicated relevant quantitative differenceswhen the dynamic structural response of the building was analysed, such as the reduction of the horizontal translational displacements and peak acceleration values, when the effects of the masonry infills and the soil-structure interaction were considered. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6213 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6213/5264

oai:publicacoes.softaliza.com.br:article/6214 2024-07-10T10:58:13Z cilamce2020:ART

Structural assessment of lattice steel towers used in power transmission lines Mariana Souza Rechtman José Guilherme S. da Silva steel lattice towers power transmission lines nonlinear analysis The lattice steel towers have been widely used as supports for overhead power transmission lines.These towers have become essential elements to the transmission systems and their stability contributes to abetter functioning and electrical safety. In this research work, a three-dimensional latticed structural system,composed by primary and redundant members was adopted to represent the steel towers. In current designpractice, redundant members are not included in the finite element models and a linear analysis is performed forthe structural design. Considering this methodology, several design recommendations indicates that the forcesacting on the redundant members can be up to 2.5% of the forces on the primary elements (main elements).Therefore, the main objective of this investigation is to develop an analysis regarding the redundant member’sstructural behaviour of lattice steel towers used in power transmission lines, having in mind the assessment ofthe forces, as well as the design on these elements. Hence, five different steel towers associated to a 500 kVtransmission line were investigated and a nonlinear analysis was performed aiming to determine the forcesvalues acting on the redundant members and comparing with those calculated according to the design standards(linear analysis). The global structural behaviour related to the redundant elements failure was also studied, aswell as the influence of the angle between the members, having in mind the forces values. The results obtainedalong this analysis have shown relevant quantitative differences between the forces values established by thedesign standards and those calculated through a nonlinear analysis based on finite element models. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6214 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6214/5265

oai:publicacoes.softaliza.com.br:article/6215 2024-07-10T10:58:13Z cilamce2020:ART

BIM aplicado a projetos de engenharia, com foco em incompatibilidades – Estudo de caso André Luigui Bezerra Santos Sara de Oliveira Marques Luna Marcilene Vieira da Nóbrega Janielly Kaline de Oliveira Ferreira da Fé Projetos de engenharia BIM Incompatibilidades Durante muito tempo a elaboração de projetos de engenharia consistiu na utilização de diferentesplataformas, utilizando-se para a elaboração das plantas baixas, desenhos auxiliados por computador (CAD), desoftwares estruturais, para dimensionar as estruturas e planilhas eletrônicas, para quantificar os materiais.Entretanto, a não centralização dos projetos e quantitativos acaba ocasionando a perda ou o aumento deinformações durante o processo de quantificação, culminando no excesso ou na falta de material durante o processoconstrutivo. Além disso, devido aos projetos complementares não serem executados dentro de uma mesmaplataforma diversos problemas quanto a compatibilidade entre os projetos surge durante a execução das obras.Como forma de gerar dados cada vez mais precisos as ferramentas de Modelagem/Modelação da Informação daConstrução (BIM) surgem com um ambiente ideal para a modelagem de projetos e checagem deincompatibilidades. Neste trabalho será utilizada uma plataforma BIM, o Autodesk Revit®, para realizar umestudo de caso dos desenhos arquitetônicos e complementares de uma residência unifamiliar feito no AutodeskAutoCAD®, juntamente com o Autodesk Neviswork® para checagem das incompatibilidades entre os projetos.Comparando com os projetos já realizados de maneira convencional foi possível encontrar incompatibilidadesentre elementos estruturais, instalações e estrutura. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6215 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6215/5266

oai:publicacoes.softaliza.com.br:article/6216 2024-07-10T10:58:13Z cilamce2020:ART

Finite element analysis of cellular beam by load control method L. Madeira G. S. Vieira J. G. Ribeiro Neto L. R. Cruvinel Cellular beams Finite elements method High-strength steel Cellular beams are of great interest due to their great flexural rigidity, high section modulus, excellentheight/weight ratio, economical and eco-sustainable construction, possibility of services through the openings ofthe web and architectural aesthetic appearance. This study perform an approach to the processes of numericalimplementation via Finite Elements Method in cellular beams evaluating their elastoplastic behavior with focuson the Vierendeel mechanism. The numerical model was calibrated against the experimental results of Warren [1]and a comparative study is carried out with respect to the physical properties of the steel, allowing to understandthe advantages that high-strength steel can promote in this kind of structure. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6216 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6216/5267

oai:publicacoes.softaliza.com.br:article/6217 2024-07-10T10:58:13Z cilamce2020:ART

Analysis of the distortional buckling curves of cold-formed steel beams through GBTUL and DSM L. Cruvinel G. Vieira E. Silva Buckling Cold-formed steel Direct Strength Method Distortional curves GBTUL Due to the wide variety of cross-section as well as their good mass/strength ratio, cold-formed steel(CFS) components are gaining prominence among metal structures. However, this material is more susceptible tolocal, distortional, and global buckling. The Direct Strength Method (DSM) requires obtaining the buckling criticalloads and applying these data in conjunction with a series of resistance curves to determine the final cross-sectionstrength. This study aims to investigate the behavior of distortional buckling mode for a CFS simply supported beam, and to compare the results obtained through DSM and GBTUL (software responsible for numerical compu-tational analysis). To obtain the data, the GBTUL was used, which, in turn, uses the geometries and flow stresses. For this analysis, a cold-formed, non-drilled, multi-dimension section was chosen. From the analyses presentedin this paper, it was noticed that the distortional curves available in the Brazilian standard do not overestimate thefinal strength of the CFS beams simply supported when subjected to uniform bending. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6217 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6217/5268

oai:publicacoes.softaliza.com.br:article/6218 2024-07-10T10:58:13Z cilamce2020:ART

Shape optimization of cold-formed steel columns using generalized beam theory and genetic algorithms M. Neves C. Baságlia Cold-formed steel columns Generalized Beam Theory Genetic Algorithms Optimization The search for lighter and more efficient design has put thin walled steel structures on the center of theattention from civil engineers. Furthermore, with the necessity to fight its slenderness and improve its structuralworth we have a need to find its best optimal cross section. The newest way to achieve such is to wed bothGeneralized Beam Theory (GBT) and Genetic Algorithms (GA) for an improved analysis that takes short periodsof processing times. Enhancing structural elements to endure local and distortional failures with longitudinalstiffeners is not something new to engineers although could be even more efficient for a computer to do it. Thepursuit for the best stiffener geometry and its location based on the knowledge of the local and distortionalresponses from multiple elements could save an abundance of resources and time. The goal of this work is toimplement a computational calculation using a genetic algorithm to find the most suitable solution within a limitrange of parameters for an optimal cross section design for channel and zed compressed columns. GeneticAlgorithms are a heuristic search that mimics natural evolution events. Learning by evolving generations populatedwith random elements and combinations of the best cross sections the algorithm sets its goal to find the optimalsolutions for distortional and local strengths separately. After its goals are met is its job to try to cross both solutionsto turn into an optimal cross section design. With the local and distortional critical loads, the element could beanalyzed using the Direct Strength Method (DSM) that has been widely used to design Cold-Formed Steel (CFS)elements. This implementation will be used in the future to accomplish the same on different structural elementscomposed of CFS and improve the way these elements are fabricated thus resulting in better and lighter overallstructures. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6218 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6218/5269

oai:publicacoes.softaliza.com.br:article/6219 2024-07-10T10:58:13Z cilamce2020:ART

Finite element simulation of composite steel-concrete castellated and cellular beams: effect of the web openings Matheus E. Benincá Inácio B. Morsch Composite cellular beams composite castellated beams web-post buckling finite element method Composite castellated or cellular beams consist of a concrete slab linked with castellated or cellularsteel profiles through shear studs. Particularly, for simply supported beams, it results in an optimized structuralsolution. However, designing a composite alveolar beam is not a simple task, since Brazilian and internationalstandards do not specify criteria for its analysis and design. Therefore, advances in numerical simulations areimportant for a better understanding of their complex structural behavior, which involves different failure modes.This work continues the research presented in the latest edition of CILAMCE, in which a finite element modelwas developed and validated, using ANSYS software. This model was used in this paper to study the effects ofthe web openings on the structural behavior of composite beams. For this purpose, firstly two composite cellularbeams experimentally tested in previous works were numerically simulated, considering the cases with and withoutweb openings. Secondly, it was proposed an example of a beam with a larger span (11 m) subjected to a uniformlydistributed load, and a numerical study was carried out considering both the original steel profile, without holes,and the expanded profiles, with different opening patterns. It was concluded that the web-post buckling may limitthe structural gains on load capacity, so it is important to adopt opening patterns that enhance the resistance of thebeam to this mode of failure. On the other hand, when the failure mode is the formation of a flexural mechanism,it was verified that the load capacity gain is influenced by the expansion ratio and the tee-section height. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6219 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6219/5270

oai:publicacoes.softaliza.com.br:article/6221 2024-07-10T10:58:13Z cilamce2020:ART

Desenvolvimento de software de análise, dimensionamento e verificação de lajes retangulares de concreto armado Aaron Farah Nolasco Ana Waldila de Queiroz Ramiro Reis Rodrigo Bird Burgos slabs thin plates reinforced concrete software The progress of theoretical knowledge and computational technology has enabled the development ofseveral methods for the analysis and design of structures. Reinforced concrete is still widely used today in severalstructures, from bridges to buildings. Even in so-called composite structures (steel-concrete), slabs in reinforcedconcrete are still used, since the material is the best choice in terms of plate behavior. In this way, the design ofslabs is still a current issue, and this procedure must guarantee that the final structure is safe from both the ULS(Ultimate Limit State) and SLS (Service Limit State) points of view. In the context of slabs design and to assistcivil engineering students and newly graduated engineers, this work presents the development of computersoftware for the design of reinforced concrete slabs, based on Visual Basic programming language for theWindows operating system. This software uses design tables for obtaining internal forces in thin plates (Kirchhofftheory), allows the design and verification of reinforced concrete two-way slabs in a fast and practical way. Suchimplementations are confronted with classical examples, in order to prove the validity of the results obtained bythe software. Finally, the user can export these solutions to a text document, so that it can be easily interpreted andmanipulated. It should be noted that the design and verification procedures implemented in the software are inaccordance with criteria established by the Brazilian Standard NBR 6118:2014. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6221 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6221/5271

oai:publicacoes.softaliza.com.br:article/6222 2024-07-10T10:58:13Z cilamce2020:ART

GBT-Based buckling analysis of cold-formed steel purlin-sheeting systems using restrained deformation modes Heitor de F. Araujo Cilmar Basaglia Cold-formed Steel purlins Buckling Analysis Generalized Beam Theory (GBT) In Generalized Beam Theory (GBT), which incorporates genuine plate theory concepts, the cross-section displacement field is expressed as a linear combination of deformation modes, making it possible to write the equilibrium equations in a very convenient format. In practical applications, thin-walled steel members areoften continuously braced along their lengths - e.g., cold-formed steel purlins restrained by sheeting. In order toincorporate such bracing in a GBT analysis, two approaches can be followed: (i) incorporate the restraints only atthe member analysis stage, which means that the deformation modes are obtained for the unrestrained cross-section(conventional approach) or (ii) incorporate the restraints at the cross-section analysis stage, which means that thedeformation modes already take them into account (restrained cross-section analysis approach - proposed in thiswork).This paper reports the results of an investigation on improving the GBT buckling analysis of continuouslybraced cold-formed steel purlins by including the displacement/rotation restraints at the cross-section analysisstage, i.e., during the determination of the cross-section deformation modes and calculation of the associated modalproperties - the end product of this procedure are “restrained deformation modes”. After describing, the proceduresinvolved in the determination of such restrained deformation modes, the paper illustrates the advantages of theiruse in the GBT-based buckling analysis of cold-formed steel purlins restrained by sheeting. For validation andassessment purposes, some GBT-based results are compared with values provided by the codes GBTUL2.0 (conventional GBT approach) and Finite Strip Method (FSM) analyses. It is still worth noting that restrained cross-section analysis makes it possible to obtain semi-analytical solutions to determine critical buckling loadings in purlins restrained by sheeting - such solutions are based on one or two restrained deformation modes. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6222 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6222/5272

oai:publicacoes.softaliza.com.br:article/6223 2024-07-10T10:58:13Z cilamce2020:ART

Strength analysis of steel columns under influence of residual stresses and geometric imperfections Jefferson A. Ferreira Giovani V. Costa Harley F. Viana Renata G. L. Silva Advanced analysis Geometric imperfections Residual stresses Strength of steel columns Knowledge about the behavior of structures is of great importance for the correct design of a structuralproject. Generally, it is desired to obtain lighter and slender structures, which, in addition to providing cost savings,present a good performance in face of the requesting efforts. In addition, improvements in computational methodsfor advanced analysis have favored the achievement of results closer to the structure’s real behavior. In this sense,the objective of this article is to evaluate the influence of residual stresses and geometric imperfections on steelcolumns subjected to bending around weak-axis, especially in columns with intermediate slenderness (40 ≤ l / r ≤120). For this end, it is used the data obtained by a non-commercial software, called PPLANLEP program, whichis based on the Finite Element Method and is capable of considering the physical nonlinearity, modeled by thedistributed plasticity approach, and the geometric nonlinearity. In the analyses, residual self-balanced stresses dueto material manufacturing process are considered with different magnitudes and distributions on the flanges andweb for an I-type cross section. In addition, this factor is combined with different configurations of initialgeometric imperfections. Finally, the resistance curves of the columns are compared with the curves proposed bythe Brazilian standard ABNT NBR 8800: 2008 and European standard EN 1993-1-1: 2005. It is verified aninadequacy in the use of the single buckling curve, adopted by the Brazilian standard, for flexural buckling aboutminor axis. In addition, it is observed that the use of the buckling curve “c” proposed by the European standard ismore assertive for the design of columns subjected to bending around the weak-axis. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6223 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6223/5273

oai:publicacoes.softaliza.com.br:article/6224 2024-07-10T10:58:13Z cilamce2020:ART

GBT-based buckling analysis of composite steel-concrete beams Carlos M. Andrade Júnior Cilmar D. Basaglia Distortional buckling Generalized Beam Theory (GBT) Restrained deformation modes Continuous restrained I-section beams may be subject to lateral-distortional buckling and web lateralbuckling in regions of negative bending. Buckling analysis of restrained beams demands time-consuming ShellFinite Element Method (SFEM) models. SFEM is an important unquestionable tool to solve eigenvalue problems,however, it requires models involving several degrees of freedom and substantial engineering judgment. This factexplains why assessing the structural response of such structural systems constitutes a complex task. One verypromising route that has been explored in the last decade is the use of Generalized Beam Theory (GBT) − a beamtheory that incorporates genuine folded-plate concepts. In this context, a GBT-based analytical solution for thedistortional buckling is proposed. First, the continuous elastic torsional restraint is incorporated in the cross-section distortional deformation mode. Next, a kinematic assumption comprising the null shear strain in each wall mid-plane is imposed to determine the distortional displacement field. Finally, the buckling stress is derived from an energy method. The accuracy of the solution is validated by numerical solutions provided by the 2.0 release of thesoftware GBTUL. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6224 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6224/5274

oai:publicacoes.softaliza.com.br:article/6225 2024-07-10T10:58:13Z cilamce2020:ART

Numerical study of CHS-SHS and CHS-RHS T-joints with chord web failure Daniel J. R. Pereira João B. S. Neto Luiza G. V. Alves Messias J. L. Guerra Gabriel V. Nunes Arlene M. C. Sarmanho Hollow steel sections Joints Chord web failure Slender sections Hollow steel sections have properties that enable their use in large span structures and trusses, in whichthe design of joints between chords and braces with hollow steel sections are composed of circular (CHS),rectangular (RHS) or square (SHS) cross-sections. However, the current design prescriptions do not contemplatethe design of T-joints with containing slender cross-sections. In this work, CHS-SHS and CHS-RHS T-joints withbrace-to-chord ratios equal to one and composed of chords with slender sections were analysed through anumerical analysis using a commercial software. A brace axial load of compression was applied, and the normaltension distributions, the joint resistance and the load-displacement behaviour were examined. The numericalresults were compared with a design equation from a normative prescription. Chord web failure was observed inall the joints analysed. Thus, the joints outside the current validity ranges of the normative prescriptions – that is, with slender sections – presented the same predicted failure mode for joints with compact or semi-compact cross-sections. The comparison between numerical and analytical joint resistances showed that current design equation does not adequately predict the joint behaviour of joints with slender chords. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6225 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6225/5275

oai:publicacoes.softaliza.com.br:article/6226 2024-07-10T10:58:13Z cilamce2020:ART

Análise experimental de uma viga de concreto armado reforçada com barras externas protendidas Jorge Luiz de Souza Junior Hidelbrando José Farkat Diógenes Andrea Brasiliano Silva Marília Marcy Cabral de Araújo Mayara Cinthia de Oliveira Mesquita concreto armado análise estrutural dano reforço estrutural protensão externa A degradação do concreto é uma condição natural que deve ser avaliada em cada caso. Na análiseestática, a avaliação pode ser feita por meio de deslocamentos em um determinado intervalo de tempo. Naanálise dinâmica, essa avaliação pode ser feita por meio da análise modal, que permite a identificação defrequências naturais, formas modais e taxas de amortecimento. As técnicas de armadura são soluções queproduzem ganho de rigidez na recuperação estrutural, neste sentido, a utilização de barras externas protendidasem elementos danificados tem se mostrado bastante adequada, de forma que sua execução possa ocorrer semmaiores interferências destrutivas. Assim, para verificar a eficácia da utilização desta técnica, foi dimensionado eproduzido um protótipo de viga de concreto armado que, posteriormente, foi submetido ao ensaio de flexão e aoensaio de captura de frequências naturais com o software Sonelastic®. Com base nos resultados das análises,constatou-se que o sistema de barras externas protendidas pode ser eficiente na recuperação estrutural. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6226 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6226/5276

oai:publicacoes.softaliza.com.br:article/6227 2024-07-10T10:58:13Z cilamce2020:ART

Modelagem Numerica de Vigas de Aço Constituídas por Perfis Formados a Frio Gregorio Sandro Vieira Jerfson Moura Lima Vigas em aço Modelagem numerica Metodo dos Elementos Finitos Os sistemas estruturais que utilizam perfis de ac ̧o formados a frio tem aumentado sobremaneira sua ˆparcela no Mercado. Apesar disto, os estudos dos comportamentos destes perfis quando submetidos aos maisdiferentes tipos de carregamentos, nao tem acompanhado na mesma proporc ̧ ̃ ao esta utilizac ̧ ̃ ao. Neste trabalho ̃foi apresentado um estudo numerico feito em vigas compostas por dois perfis met ́ alicos formados a frio do tipo ́“U” simples unidos por suas almas formando uma sec ̧ao do tipo “I”. O objetivo principal deste estudo foi desen- ̃volver um modelo numerico tridimensional e n ́ ao-linear capaz de simular o comportamento de vigas constitu ̃ ́ıdaspor perfis formados a frio. Para o desenvolvimento do modelo numerico foi utilizado o programa computacional ́ABAQUS, baseado no Metodo dos Elementos Finitos. O modelo num ́ erico foi calibrado e validado com os resul- ́tados experimentais da literatura. Os resultados numericos obtidos foram concordantes com os resultados experi- ́mentais. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6227 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6227/5277

oai:publicacoes.softaliza.com.br:article/6228 2024-07-10T10:58:13Z cilamce2020:ART

Proposta para obtenção do momento de inércia efetivo aplicado à laje mista de aço e concreto Elis Lemos Andrade Rodrigo Sernizon Costa Armando Cesar Campos Lavall Renata Gomes Lanna da Silva Harley Francisco Viana laje mista aço e concreto momento de inércia efetivo flecha A análise do comportamento e da resistência de lajes mistas de aço e concreto abrange vários parâmetros;nesse viés, a curva carga versus flecha no meio do vão consiste em uma importante relação para a verificação dosdeslocamentos. Em relação ao cálculo da flecha, geralmente, as normas técnicas recomendam que o momento deinércia da seção mista seja dado pela média simples dos momentos de inércia das seções não-fissurada e fissurada.Porém, investigações experimentais mostram que esse procedimento não representa adequadamente ocomportamento das lajes mistas de aço e concreto, levando a uma estimativa inadequada do momento efetivo deinércia e resultando em menor flecha, principalmente quando submetidas a cargas maiores. Utilizando osresultados de pesquisas realizadas no Departamento de Engenharia de Estruturas da UFMG, este trabalho temcomo objetivo apresentar uma proposta para determinar o momento de inércia efetiva em lajes mistas querepresenta adequadamente o comportamento durante a fase de carregamento. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6228 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6228/5278

oai:publicacoes.softaliza.com.br:article/6229 2024-07-10T10:58:13Z cilamce2020:ART

Numerical analysis of the structural behavior of flat plates under tension loads K. Rocha J. G. R. Neto B. S. Rocha steel structures tensile elements numerical analysis finite element method Based on the guidelines provided by the ABNT NBR 8800 [1], the present study analyzes theprescription for determining the strength of cross-sections with holes arranged straight or zigzag for elementssubject to tensile load. In case of misaligned holes, these calculations are performed by a semi-empirical parameter,defined by the Cochrane equation. This additional parameter covers an increase of resistance from an additionalequivalent portion of the cross-sectional area. In this work, it is intended to simulate numerically the structuralbehavior of flat steel plates under tensile stress through a finite element modeling processed by Ansys 16.0 andverify the compatibility with the analytical methods prescribed by the code. Three plates were modelled accordingto the study by Oliveira and Wietzikoski [2] to attest the collapse modes, rupture profile, and resistance obtainedexperimentally and validate the analytical prescriptions from the results of the numerical modeling. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6229 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6229/5279

oai:publicacoes.softaliza.com.br:article/6230 2024-07-10T10:58:13Z cilamce2020:ART

DIMENSIONAMENTO E ANÁLISE COMPUTACIONAL DE UM GALPÃO METÁLICO UTILIZANDO O SOFTWARE SAP 2000 Bianca Saldanha Pinheiro Salete Souza de Oliveira SAP 2000 análise estrutural tutorial estrutura metálica modelagem O presente trabalho apresenta um tutorial do SAP 2000 v.16 - Structural Analisys Program, paramodelagem, dimensionamento e análise estrutural de um galpão com estrutura em perfis metálicos. O SAP 2000é um software para análise estrutural que utiliza o método dos elementos finitos, desenvolvido pela empresaamericana CSI – Computers&Structures Inc. e comercializado no Brasil pela empresa Multiplus SoftwaresTécnicos in. O software é vastamente utilizado para analisar edificações de pequeno, médio e grande porte, noentanto, apesar de ser uma importante ferramenta de análise e dimensionamento, nota-se a dificuldade dos alunosde engenharia civil em aprender a usá-lo, assim como a escassez de material em português apresentando,didaticamente, tutoriais para auxiliar na utilização do programa, visto que, com a evolução das estruturas, queestão se tornando cada vez mais complexas, tornou-se, em grande parte das situações, inviável a resolução pormeio de cálculos analíticos. Desta forma, o presente trabalho visa contribuir para diminuir estas dificuldades,apresentando um manual de modelagem, dimensionamento e análise de uma estrutura metálica, a fim de gerar operfil adequado para cada barra, assim como os diagramas de esforços, deflexões, momentos, cisalhamento,reações e deformadas. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6230 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6230/5280

oai:publicacoes.softaliza.com.br:article/6231 2024-07-10T10:58:13Z cilamce2020:ART

Comparative Optimization Study of an Isogrid Structure Using Sunflower Optimization and Genetic Algorithm Francisco, M. B. Gomes, G. F. Cunha Jr, S. S. Da Silva, L. R. R. Silva, B. A. Isogrid structure Genetic Algorithm Sunflower optimization Response Surface Methodology Finite Element Method Isogrid structure emerged in the early 1970s due the need for lightweight and high-performance modelin the aeronautical industry, however, over the years, several other branches that also need these characteristicsbegan to use this type of components. The present work aims to find the optimal design parameters for the latticestructure in order to minimize the Tsai-Wu failure index and the mass of the structure under compression loads byusing two different metaheuristics algorithm: Genetic Algorithm (GA) and Sunflower Optimization (SFO). AResponse Surface Methodology (RSM) was used for the purpose of setting up a series of experiments for adequate predictions of the responses and the generated models were used as objective functions for single and multi-objective optimizations. Finally, the results of both algorithms were compared with finite element method and the performance of the new meta-heuristics algorithm SFO was evaluated. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6231 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6231/5281

oai:publicacoes.softaliza.com.br:article/6232 2024-07-10T10:58:13Z cilamce2020:ART

Tri-objective truss structural optimization considering sizing design variables José P. G. Carvalho Afonso C. C. Lemonge Patrícia H. Hallak Cláudio H. B. Resende Beatriz S. L. P. de Lima Denis E.C. Vargas Multi-objective optimization Truss structural optimization Differential Evolution Multi-Tournament Decision method Structural multi-objective optimization problems are common in the Engineering field’s real-worldproblems where one or more objective functions, in general conflicting, may be considered to be optimized, leadingto complex optimization problems. Two objective functions problems represent the great majority of formulationsin this context where Pareto fronts can be easily represented and provided to the Decision Maker (DM). Forinstance, in the trusses’ structural optimization, these conflicting objective functions may be the weight and themaximum nodal displacements to be minimized. This paper presents the formulation of multi-objective trussstructural optimization problems considering three objective functions, such as the weight, the maximum nodaldisplacement, and the first natural frequency of vibration. The constraints refer to the allowable axial stressesin the bars. Several experiments inspired in the benchmark mono-objective optimization are analyzed in thispaper, presenting their Pareto surfaces showing the non-dominated solutions. The structural optimization problemsconsider sizing and shape design variables simultaneously, and they can be continuous, discrete, or mixed. Thesearch algorithm adopted to solve these problems is a modified version of the Differential Evolution called ThirdEvolution Step Differential Evolution (GDE3). One of the most important steps, after obtaining the Pareto surfaces,is the definition of which solution or solutions will be chosen by the decision-maker (DM), a non-trivial task. AMulti-Tournament Decision method, commonly used in bi-objective optimization, is adapted in this paper to extractthe solutions from the Pareto surfaces based on DM preferences. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6232 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6232/5282

oai:publicacoes.softaliza.com.br:article/6233 2024-07-10T10:58:13Z cilamce2020:ART

Uso da Otimização por Colônia de Formigas (ACO) na determinação trajetória de pulsos ultrassónicos em elementos de concreto Vinícius M. Giglio Vladimir G. Haach Concreto Ensaios nao destrutivos Tomografia ultrassônica Otimização por colônia de formigas Os ensaios nao destrutivos t ̃ em se mostrado eficientes na detecc ̧ ˆ ao de heterogeneidades do concreto, se ̃firmando como uma alternativa menos invasiva e com menor variabilidade estat ́ıstica. Dentre estes, o ensaio deultrassom tem se desenvolvido bastante. E poss ́ ́ıvel combina-lo com a t ́ ecnica de tomografia computadorizada para ́gerar imagens do mapa de velocidades do pulso ultrassonico em sec ̧ ˆ oes transversais de estruturas. No entanto, para ̃calcular essas velocidades, e necess ́ ario que se assuma uma hip ́ otese a respeito da trajet ́ oria seguida pelos pulsos. ́O presente artigo tem como objetivo determinar a trajetoria de pulsos ultrass ́ onicos em elementos de concreto ˆutilizando a otimizac ̧ao por col ̃ onia de formigas na variac ̧ ˆ ao ACS ( ̃ Ant Colony System). Para isso, um modelodo algoritmo foi implementado no software de gerac ̧ao de imagens tomogr ̃ aficas em estruturas TUSom. A fim de ́comparar os parametros tempo de processamento e qualidade das soluc ̧ ˆ oes fornecidas, o ACS foi comparado com o ̃algoritmo determin ́ıstico de Dijkstra em um exemplo de sec ̧ao de concreto com defeitos simulados. Os resultados ̃demonstraram que Dijkstra apresentou melhor desempenho em problemas pequenos (ate 150 n ́ os), enquanto o ́ACS se mostrou muito superior conforme a malha cresce, se firmando como uma alternativa mais rapida para ́solucionar o problema das trajetorias. ́ XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6233 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6233/5283

oai:publicacoes.softaliza.com.br:article/6234 2024-07-10T10:58:13Z cilamce2020:ART

Static Analysis and Optimization of stiffened plates under pressure loading Beatriz F. Souza Carla T. M. Anflor Daniel O. Fernandes Ariosto B. Jorge Besim Baranoglu Stiffened Plates Optimization Exhaustive Search Finite Elements In this work, the Exhaustive Search Method (ESM) was used to optimize a plate structure with stiffeners.The main goal is to establish a numerical simulation procedure in order to identify the optimal geometry forstiffened steel plates, where the objective function to be minimized is the maximum displacement, keeping thetotal reference volume constant. The search process is allowed to vary the number, thickness, and height of thestiffeners. The optimization and analysis of mechanical behavior were performed by ESM combined with ANSYSMechanical APDL software which is based on the Finite Element Method (FEM). The stiffened plates werecalculated to transform 40% of the total volume into stiffeners. The optimal geometry resulted in a reduction of98.34% in the maximum displacement if compared to the reference plate showing the good results obtained by theproposed methodology. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6234 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6234/5284

oai:publicacoes.softaliza.com.br:article/6235 2024-07-10T10:58:13Z cilamce2020:ART

OTIMIZAÇÃO DE VIGAS CASTELADAS DE AÇO Mateus P. Pauletto Moacir Kripka Optimization Castellated Beams Simulated Annealing Web Openings Due to the increasing competition, associated to growing concerns about the environmental impactscaused by construction, it is important the rational use of structural materials. In this sense, optimization techniquescan be seen as valuable tools to improve the design efficiency. This work presents the application of optimizationto design of castellated steel beams, aiming the weight minimization. To achieve this goal, both the dimensions ofthe profile and of the holes were taken as the design variables. The constraints, related to ultimate and limit states,were considered according to Brazilian standards. The optimization was performed through the usage of SimulatedAnnealing Method, a meta-heuristic developed upon the analogy of the annealing of metals. Based on theformulation implementation, some structures were analyzed in order to verify the efficiency of the proposedprocedure. In addition, welded and laminated optimized steel beams were compared, aiming to ide notify therelative economy obtained. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6235 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6235/5285

oai:publicacoes.softaliza.com.br:article/6236 2024-07-10T10:58:13Z cilamce2020:ART

Dimensionamento otimizado de vigas de aço e de concreto armado: estudo comparativo Joel M. Ozimboski Zacarias M. C. Pravia Moacir Kripka beams optimization reinforced concrete steel cost This work presents a study related to the optimization of reinforced concrete beams and steel beams.Initially, formulations to optimize reinforced concrete beams of rectangular section and “I” welded steel beamswere developed, aiming to minimize the total cost. For both structural materials, cross-sectional dimensions wereconsidered as discrete design variables. To the constraints, related to serviceability and ultimate limit states,Brazilian Standards NBR6118/2014 and NBR8800/2008 were adopted, respectively to reinforced concrete and tosteel beams. The developed formulations were computationally implemented by the usage of Simulated Annealingoptimization method. From a parametric study considering different spans and loads, simply supported beamswere analyzed in order to obtain the optimized costs and their corresponding cross-sectional dimensions. Thecomparison of concrete and steel beams aimed to clearly identify the advantages of each structural material to agiven span in terms of cost, height and self-weight. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6236 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6236/5286

oai:publicacoes.softaliza.com.br:article/6237 2024-07-10T10:58:13Z cilamce2020:ART

A tri-objective truss design optimization using a Multi-objective Craziness based Particle Swarm Optimization Erica C.R. Carvalho Afonso C.C. Lemonge Samuel C.A. Basílio Patrícia H. Hallak Multi-objective Truss Optimization Particle Swarm Optimization Multiple natural frequencies of vibration Recently there has been a growing interest in evolutionary multi-objective optimization algorithmsdue to its applicability in problems from several fields, especially those of applied engineering and mathematics.In this context, there are many of algorithms applied to these types of problems, such as differential evolution, genetic algorithms, particle swarm, among others. This paper deals with a multi-objetive sizing, discrete or con-tinuous, strucutural optimization problem with respect to: i) the minimization of the mass of truss structures; ii) the maximization of the first natural frequency of vibration and iii) the minimization of the maximum displace-ment, considering stress constraints. A multi-objective particle swarm algorithm called Multi-objective Craziness based Particle Swarm Optimization (MOCRPSO) is the search algorithm adopted here and an Adaptive Penal-ization Method (APM), which has been successfully applied to solving mono-objective optimization problems, is used to handle the constraints. Some computational experiments are analyzed, presenting very interesting resultsproviding pareto fronts between the objectives. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6237 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6237/5287

oai:publicacoes.softaliza.com.br:article/6238 2024-07-10T10:58:13Z cilamce2020:ART

Optimal Search Space for Topological Optimization of Transmission Line Towers Gabriel P. Alves Leandro F. F. Miguel Joel V. Pimenta Structural Optimization Transmission Line Towers Meta-heuristics Due to the vast territorial extension of Brazil and its hydroelectric potential, many power plants are builtfar from consumption centers and in order to deliver electricity to these centers, extensive transmission lines (TL)are needed. One of the main components of these lines are the steel lattice towers, which end up being repeatedseveral times in a TL. For this reason, an opportunity to reduce costs presents itself through the optimization of these structures, especially when the dimension, geometry and topology of the tower are optimized simultane-ously. However, with the inclusion of topological variables an uncertainty arises due to the definition of the search space for the process of optimization. On one hand, if many variables are considered, the convergence may beimpaired. On the other hand, if just a few variables are chosen, great possibilities of mass reduction might be leftaside. Hence, the present work aims to relate the structure mass and its search space, finding a general rule fortemplates selection by analyzing the optimization results of eight towers with three design spaces for each, wherethe difference between these is the number of templates considered. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6238 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6238/5288

oai:publicacoes.softaliza.com.br:article/6239 2024-07-10T10:58:13Z cilamce2020:ART

Optimization of transmission line towers considering the family concept Alexandre Deichmann Leandro F. F. Miguel Rafael H. Lopez Joel V. Pimenta Structural optimization Transmission line tower tower family Transmission line towers (TLTs) are responsible to support the cables of overhead transmission lines(TLs). Because these structures are repeated several times in a line, the application of optimization procedures ishighly recommended. In the design of a line, towers with different heights and leg combinations are necessary.However, it would be difficult to individually design or produce these supports. Therefore, for the ease of design, industrial production and erection processes, a TLT can be separated in main parts, such as basic body, body ex-tensions and legs. The so-called tower family is the combination of these minor components in order to obtain the different supports. The present work aims to apply this concept into a size, shape and topology optimization pro-cedure of TLTs. The developed optimization procedure is an extension of the methodology proposed by de Souza et al. [1]. A self-supported 138 kV double circuit tower family composed by tower body, one body extensionand two different tower legs was evaluated. The sizing of redundant members and each bolted connection areconsidered. The final solution is around 9% lighter than the original family design, showing the efficiency of theproposed optimization procedure. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6239 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6239/5289

oai:publicacoes.softaliza.com.br:article/6240 2024-07-10T10:58:13Z cilamce2020:ART

A Comparative analysis of structural optimization of spatial steel frames considering different bracing systems Claudio H. B. Resende Afonso C. C. Lemonge Patrícia H. Hallak Jose P.G. Carvalho Luiz F. Martha Structural optimization Steel frames Bracing systems Differential evolution In tall steel buildings, aspects related to natural frequencies of vibration, global stability, and horizontaldisplacements due to wind pressure become more relevant when compared to sizing strength constraints. In thissense, the bracing systems may be crucial to improve the dynamic behavior increasing the structure stiffness. Thispaper shows a comparative analysis between four bracing systems used in six-story spatial steel frames subjected toweight minimization. This study shows which bracing system is most suitable for the final design of the structure.The constraints imposed in the structural optimization problem are the first natural vibration frequency, the criticalload factor concerning to global stability, and horizontal displacements. The search algorithm is the DifferentialEvolution (DE) coupled with an Adaptive Penalty Method (APM) to handle the constraints. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6240 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6240/5290

oai:publicacoes.softaliza.com.br:article/6241 2024-07-10T10:58:13Z cilamce2020:ART

Global stability and natural frequencies of vibration in multi-objective op- timization of 3D steel frames. Claudio H. B. Resende Afonso C. C. Lemonge Patrícia H. Hallak Jose P.G. Carvalho Julia C. Motta Multi-objective optimization Steel frames Natural frequencies of vibration Global stability In a structural optimization problem, it may be desired not only to minimize the cost of the final designbut also to enhance its performance. In this sense, aspects concerning the first natural frequency of vibrationand the critical load factor concerning global stability may be desired to be maximized. Also, for instance, thedisplacements are to be minimized, leading to conflicting objective functions. This paper analyses multi-objectivestructural optimization of 3D steel frames considering the weight minimization of the structure with the first naturalfrequency, the critical load factor, and the maximum horizontal displacement in three different multi-objectiveproblems. The analysis presents their Pareto-fronts showing the non-dominated solutions, leaving the task ofdefining which solution or solutions to be extracted from these curves to a Multi-Tournament method based on thepreferences of the decision-maker. The search algorithm adopted is the Third Step Differential Evolution (GDE3)coupled with an Adaptive Penalty (APM) Method to handle the constraints. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6241 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6241/5291

oai:publicacoes.softaliza.com.br:article/6242 2024-07-10T10:58:13Z cilamce2020:ART

Fatigue Curves in Steel Railway Generated by Genetic Algorithm Maria Rafaela B. de M. Ribeiro José Antônio F. Santiago Ritermayer M. Teixeira Fatigue Railway Bridge Probabilistic Analysis Genetic Algorithm Genetic Algorithms (GA) are global optimization, based on natural selections and genetic mechanismsfor which structured and random search strategies are geared by reinforcing the search for high amplitude pointsin which the function to be minimized (maximized) has relatively low (high) values. This work deals with a studyon the Genetic Algorithm application to estimate parameters inherent to S-N-p Curves generated for typicallystructural details of the metal railway bridges applying together with The Maximum Likelihood Method to inferrunout data, such as censored data for failure probability functions. MatLab software is employed to develop thecomputational program. To compare the obtained results, the Interior Point Algorithm is also presented, due to itswide use in problems involving linear and nonlinear quadratic programming. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6242 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6242/5292

oai:publicacoes.softaliza.com.br:article/6243 2024-07-10T10:58:13Z cilamce2020:ART

A Dynamic Treatment Criterion of Population Sizes in PSO Samuel C.A. Basílio Afonso C.C. Lemonge Érica C.R. Carvalho Patrícia H. Hallak Structural Optimization Problems Metamodel-Based Optimization Particle Swarm Optimization Populational algorithms are strongly dependent on parameters, and among them, the size of the pop-ulation directly impacts the search for optimized solutions and computational cost. As the population grows, the slice of the inspected search space also tends to expand, allowing new optimums to be discovered. However, the increase in this population also implies an increase in the objective function calls, consequently increasing the al-gorithms’ computational effort and execution time. When the objective function calls are the execution bottleneck, the number of individuals observed at each iteration is decisive for the weight given to exploration and exploita-tion. In general, the choice of population size happens empirically, through the user’s experience. However, the dynamic treatment of population size can be a more interesting choice. In optimization problems that require asimulator, such as optimization in mechanical and structural engineering, the decrease in computational cost is very significant. Moreover, many simulations have high computational costs, motivating the study of a less empir-ical approach in population size choosing. Here we propose and study an approximation metamodel in the form of a criterion for dynamic treatment of the population size of a Particle Swarm Optimization algorithm applied tomechanical engineering optimization problems. This metamodel considers that particles that are very close andwith similar speeds will have similar behavior, tending to the same solution, thus allowing one of the particles tobe eliminated. Comparative results are presented using the proposed strategy, showing that it achieved the desiredexpectations. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6243 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6243/5293

oai:publicacoes.softaliza.com.br:article/6245 2024-07-10T10:58:13Z cilamce2020:ART

A Dynamic Treatment Criterion of Population Sizes in PSO Samuel C.A. Basílio Afonso C.C. Lemonge Érica C.R. Carvalho Patrícia H. Hallak Structural Optimization Problems Metamodel-Based Optimization Particle Swarm Optimization Populational algorithms are strongly dependent on parameters, and among them, the size of the pop-ulation directly impacts the search for optimized solutions and computational cost. As the population grows, the slice of the inspected search space also tends to expand, allowing new optimums to be discovered. However, the increase in this population also implies an increase in the objective function calls, consequently increasing the al-gorithms’ computational effort and execution time. When the objective function calls are the execution bottleneck, the number of individuals observed at each iteration is decisive for the weight given to exploration and exploita-tion. In general, the choice of population size happens empirically, through the user’s experience. However, the dynamic treatment of population size can be a more interesting choice. In optimization problems that require asimulator, such as optimization in mechanical and structural engineering, the decrease in computational cost is very significant. Moreover, many simulations have high computational costs, motivating the study of a less empir-ical approach in population size choosing. Here we propose and study an approximation metamodel in the form of a criterion for dynamic treatment of the population size of a Particle Swarm Optimization algorithm applied tomechanical engineering optimization problems. This metamodel considers that particles that are very close andwith similar speeds will have similar behavior, tending to the same solution, thus allowing one of the particles tobe eliminated. Comparative results are presented using the proposed strategy, showing that it achieved the desiredexpectations. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6245 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6245/5294

oai:publicacoes.softaliza.com.br:article/6246 2024-07-10T10:58:13Z cilamce2020:ART

Comparison of the performance of different metaheuristic optimization algorithms Otávio A. P. de Souza Letícia F. F. Miguel optimization metaheuristic algorithms performance Metaheuristic algorithms are powerful tools for solving optimization problems. With the advancementof computational technology, many metaheuristic algorithms were developed to solve optimization problemsquickly and accurately. Within this context, in this paper five of the main metaheuristic optimization algorithmsdeveloped in recent decades – Particle Swarm Optimization (PSO), Harmony Search (HS), Firefly Algorithm (FA),Search Group Algorithm (SGA) and Whale Optimization Algorithm (WOA) – had their performance compared inthe solution of problems involving the optimization of benchmark functions and the optimization of trusses inwhich the design variables are the cross-sectional areas. Each algorithm was evaluated in terms of precision,computational time of operation and standard deviation among the results obtained after many executions. Withthe results obtained, the effectiveness of the five algorithms has been proven, although the older algorithms havea slightly lower performance. In most problems, the best results were achieved through the WOA or the SGA. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6246 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6246/5295

oai:publicacoes.softaliza.com.br:article/6247 2024-07-10T10:58:13Z cilamce2020:ART

Optimización de armaduras con un algoritmo de evolución diferencial a través de control de parámetros Oscar. Contreras-Bejarano Jesús D. Villalba-Morales algoritmo adaptativo armadura control de parámetros evolución diferencial optimización In recent decades, numerical tools have been to improve the design process of civil structures. Amongthem, it is possible to find the evolutionary algorithms, which are based on analogies with the evolutionary process.Among the main limitations observed in the literature for its implementation is the need to enter the algorithmparameters for a problem in study by the user. There exist some parameters own of each algorithm that control thesuccess level. This paper presents the application of an adaptive differential evolution algorithm (ADEA) to theoptimization of planar steel trusses. In ADEA is necessary that the user to set the population size and thecoefficients cF and cCR. To show the performance of the proposed methodology, two cases obtained in the literatureare presented for comparison, which is done in terms of quality of the objective function, robustness andconvergence. It is expected that with this type of work, the results required in structural optimization problems canbe improved through implementing the differential evolution algorithm. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6247 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6247/5296

oai:publicacoes.softaliza.com.br:article/6248 2024-07-10T10:58:13Z cilamce2020:ART

Optimization Algorithm and the Inverse Problems Applied to the Structural Damage Identification in Steel Beams with the use of FEM and Experimental Data Brunno E. Sobrinho Gilberto Gomes Ramon S. Y. R. C. Silva Optimization Finite Element Method Inverse Problems Damage Identification Differential Evolution Optimization problems in academia and industry are recurrent, in addition the structural elementsconditions over their lifetime when in use acquired differents damages from their natural deterioration or evenbecause of the exceptional causes that can cause these different magnitudes of damage. In this sense, to combinethe damages identification through optimization processes in the continuous search for more adequate means andconsequently the improvement of the available informations that characterizes the problems under essential study,and constitutes one of the current engineering requirements, considering the evolutionary state of the structuralelements when in use. In this work, it is proposed the adjustment of experimentally steel beams structures tested,from a static analysis by the Finite Element Method (FEM) using ANSYS© to obtain displacements, with the useof inverse problems and an optimization method. From the adjusted models, damages in the structures aresimulated (elements stiffness properties reduction) and then an optimization technique and damage identificationare applied through the Differential Evolution Method. The modelled and experimentally steel beams structurestested showed mostly consistent results and the DE technique showed good potential for solving damageidentification problems using Inverse Problems, achieving convergence in almost all cases. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6248 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6248/5297

oai:publicacoes.softaliza.com.br:article/6249 2024-07-10T10:58:13Z cilamce2020:ART

Structural Optimization of Reinforced Concrete Beams using GA method. Guilherme Adriano Weber Alana Paula Costa Quispe René Quispe Rodríguez Civil Engineering Optimization Beams Reinforced Concrete GA In the civil construction sector, especially in the structural area, the search for optimized designs thatsatisfy architectural, constructive, safety criteria, being at the same time economic viable are the challengesexperienced by designers, who are constantly looking for tools and methods to find the ideal structure. In reinforcedconcrete structures, beams are elements designed to support and distribute the loads, generally from slabs, to thecolumns and correspond to a significant portion of the structural design. Therefore, the search for optimal beamscan be advantageous, since the final cost can be positively impacted. The main objective of this work is theoptimization of cross sections of reinforced concrete beams, having as an objective function the final cost ofreinforced concrete inputs. For computational implementation of routines for dimensioning longitudinal andtransverse reinforcement, the programming language Matlab was used. The dimensioning process of longitudinaland transverse reinforcement areas were implemented using the commercial software Matlab. This process, aswell as all imposed constraints are in accordance with the Brazilian standard NBR6118/2014. The optimizationwas achieve using the heuristic method GA (Genetic Algorithm). Diverse situations were analyzed as variations inspans and loads, having the height of the section, the resistance of the concrete (Fck) and the area of the transverseand longitudinal reinforcements as design variables. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6249 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6249/5298

oai:publicacoes.softaliza.com.br:article/6250 2024-07-10T10:58:13Z cilamce2020:ART

Topology Optimization of Continuum Elastic Structures through the Progressive Directional Selection Method Luiz C. L. Véras Márcio A. A. Cavalcante topology optimization progressive directional selection method continuum elastic structures The present work deals with a new approach for Topology Optimization (TO) of two-dimensionalcontinuum elastic structures through the Progressive Directional Selection (PDS) method. To achieve the besttopology of a structure, a typical goal is to define the best material distribution in a domain, considering anobjective function and mechanical constraints. In general, most of the studies address the compliance minimizationof structures. Numerical methods for TO of continuum structures have been investigated extensively. Most ofthose methods are based on finite element analysis, where the design domain is discretized into a fine mesh ofelements. In such a setting, the optimization procedure is to find a structure's topology by determining for everypoint in the design domain if there should be material (solid element) or not (void element). To control the processof inserting or removing finite elements without forgotten the continuum representation, standard algorithms asHomogenization, Solid Isotropic Microstructure with Penalization (SIMP), and Evolutionary StructuralOptimization (ESO) are applied in many studies. The latter approach is based on the simple concept that theoptimal design can be achieved by gradually removing inefficient material (elements) from the design space. TheESO algorithms are easy to understand and implement. However, ESO is heuristic, and there is no proof that anoptimum solution can be achieved by element elimination and admission. The original scheme is inefficient onceit needs to find the best solution by comparing several intuitively generated solutions. To avoid this problem buttaking advantage of ESO's simplicity, the PDS method, which is inspired by natural selection observed in biology,applies a strategy to minimize the strain energy of a discretized analyzed domain with a volume restriction. Basedon the performance criteria adopted for the problem, the selected population is reached through an iterative processthat converges when the optimal topology does not evolve anymore, i.e., there is no change in the final set ofselected elements. An instructional problem that shows the essence of PDS for a rigid body problem and oneexample of topology optimization of a classical problem found in the literature are investigated. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6250 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6250/5299

oai:publicacoes.softaliza.com.br:article/6251 2024-07-10T10:58:13Z cilamce2020:ART

Mechanical Project of an Automotive Part Using Numerical Analysis-Based Reverse Engineering Hiram Y. Shirata Rosicley J. R. Rosa Rodolfo A. K. Sanches Structural Optimization Finite Element Genetic Algorithm In the diverse areas of mechanical industry, sometimes it is difficult to find specific reposition parts.In such cases, it is necessary to manufacture a single part, which must have its mechanical properties similarto the original one. In this work, we develop a technique to design a replacement part based on finite elementsimulations and optimization techniques, seeking to produce a new part with optimal similarity to old one regardingmechanical properties, even if material, geometry and manufacturing process are not the same as in the originalcontext. This is done by considering that there is no previous knowledge about the design loads, being known justthe material and geometry. The mechanical analysis is based on triangular isoparametric finite element with cubicapproximation for plane stresses elasticity. In order to perform shape optimization, we employ an evolutionaryalgorithm. The developed technique is applied to a lower control arm of a vehicle that is no longer under productionas a replacement strategy. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6251 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6251/5300

oai:publicacoes.softaliza.com.br:article/6252 2024-07-10T10:58:13Z cilamce2020:ART

Modeling and Model Predictive Control (MPC) of an Underwater Double Inverted Pendulum (UDIP) Éverton L. de Oliveira Gabriel S. Belém Victor B.R.A. Pereira Reginaldo Cardoso Décio C. Donha Underwater Double Inverted Pendulum Model Predictive Control Underwater Robotics The Inverted Double Pendulum (IDP) is a classical nonlinear and unstable mechanical system used asa benchmark model for the application of innumerous control techniques. However, such a model was never treatedin an off-the-self environment, which represents a gap in its applications range since the demand for underwater robotics is increasing together with the ocean engineering activities. Thus, to fill this gap and build a new bench-mark model for the control development of underwater robotics, this paper presents the modeling and control of an Underwater Double Inverted Pendulum (UDIP). The dynamic model is formulated using the formalism of An-alytical Mechanics and considering the pertinent hydrodynamic and hydrostatic effects. To keep straight with the control techniques trends, a Model Predictive Control (MPC) is designed for the UDIP. This controller is testedthrough numerical simulations in MATLAB/Simulink© environment considering two scenarios: 1) in the absenceof disturbances, and 2) in the presence of a time-varying water current. The obtained results for the disturbancescase reveal an increase in the control effort in comparison with the case without disturbances. In such a way, thisreflect the difficulty associated to the control of underwater robots in unstructured environments. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6252 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6252/5301

oai:publicacoes.softaliza.com.br:article/6253 2024-07-10T10:58:13Z cilamce2020:ART

Vibration control of slender structures under base motions by pendulum TMD’S Tatiane Cristine Pereira de Carvalho Omar Gutierrez Campana Reyolando M.L.R.F. Brasil TMD’S pendulum slender structures vibrations The technological progress has been making possible the building of slender constructions, but verysusceptible to unwanted vibrations. To control that, it has been advised the use of TDM’s, that can decreaseconsiderably the dynamic responses. Following that line, the present work aims to realize a dynamic analysis of atall slender tower, exposed to support motions but with a pendular TDM installed to damp out the dynamic effects.In this work a finite elements model of a 90m tall slim tower without damper is modeled in the Scia Engineersoftware, to achieve the natural vibration frequencies, the structure’s equivalent stiffness and mass in the top end.With those values, a mathematical model with two degrees of freedom is built: the horizontal movement of the topend of the tower (q1) and the pendulum’s vertical angle (q2). The equations that govern the movement of thesystem are derived by the Lagrange Equations. From that model, a program in the Matlab software is introducedto calculate the structural displacement with and without a tuned pendular mass damper, to verify the dynamicdamper effects, and the displacement limit according to international standards. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6253 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6253/5302

oai:publicacoes.softaliza.com.br:article/6254 2024-07-10T10:58:13Z cilamce2020:ART

Theoretical study of Sommerfeld effect in flexible rotor shaft on structural model with two degrees of freedom Sara Prates Lima Reyolando Manoel Lopes Rebello da Fonseca Brasil machine-foundation interaction Sommerfeld Effect non-ideal systems soil-structure interaction elastic half-space theory This paper address nonlinear dynamical analysis of a foundation structure for a flexible rotor machine.The residual unbalance will always be present in rotating equipment systems. This aspect is often not consideredduring the design steps, although all real motors are non-ideal power sources. Thus, the interest in further studyingthe machine-foundation and soil-foundation interactions.Our mathematical model considers this system as non-ideal, subjected to the Sommerfeld effect, which maymanifest close to the low power machine’s resonance, with possible jumps from lower to higher frequency rotationregimes without intermediate stable solutions. The model proposed is defined by two degrees of freedom, vertical and horizontal translations, and an additional one associated with the rotation of the rotor shaft (intrinsic to the so-called non-ideal systems). The mathematical model that describes the system’s motion is derived via Lagrange equations. The solution ofthis system of differential equations can in principle be solved analytically, but this can be difficult or evenimpossible in some cases, particularly when these equations are nonlinear, such as the proposed model. Thenumerical solution adopted here will be implemented in the Matlab®. This paper aims to analyze a little studiedproblem of practical importance. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6254 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6254/5303

oai:publicacoes.softaliza.com.br:article/6255 2024-07-10T10:58:13Z cilamce2020:ART

Calculo da velocidade de flutter de uma asa retangular considerando incertezas paramétricas Marcelo A. D. Filho Antonio M. G. de Lima Gutembergy F. Diniz Denner M. Borges Aeroelasticidade Quantificac ̧ao de Incertezas Flutter No contexto da aeroelasticidade, a velocidade de flutter pode ser calculada pelo o metodo doublet lattice ́(DLM) em conjunto com o metodo dos elementos finitos (MEF) e o m ́ etodo pk. Os referidos m ́ etodos, apesar ́de bastante consolidados, sao determin ̃ ́ısticos, e nao consideram assim o efeito de variac ̧ ̃ oes nos par ̃ ametros de ˆentrada que possam existir na pratica. Assim, o objetivo deste trabalho ́ e o de verificar a influ ́ encia da incerteza ˆinerente as vari ` aveis de projeto geom ́ etricas sobre a velocidade de flutter de uma asa retangular. Com essa fi- ́nalidade, empregou-se o metodo de Monte Carlo, considerando o comprimento, largura e espessura da asa como ́variaveis aleat ́ orias, todas com distribuic ̧ ́ ao gaussiana. Conclui-se que a velocidade de flutter ̃ e sens ́ ́ıvel as variac ̧ ` oes ̃geometricas, variando 25,5% para 10% de incerteza nas dimens ́ oes avaliadas, apresentando uma distribuic ̧ ̃ ao apro- ̃ximadamente gaussiana. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6255 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6255/5304

oai:publicacoes.softaliza.com.br:article/6256 2024-07-10T10:58:13Z cilamce2020:ART

Spectral characterization of the electron drift instability in a Hall thruster Rodrigo A. F. Alves Rodrigo A. Miranda Hall thruster Plasmas Particle-in-cell simulation Electron drift instability turbulence The Hall thruster is an electric propulsion device commonly used for station-keeping purposes in satel-lites and in deep-space missions since 1971. This device generates thrust from the interaction between a plasma and electromagnetic fields. Several aspects of this interaction and the thruster operation are still not well understood.Recently, numerical simulations and experimental measurements have shown the occurence of a high-frequency,low-wavenumber instability known as the E × B electron drift instability. This instability modifies the electroncross-field mobility in the plasma and can affect the thruster efficiency.In this study we perform numerical simulations of a SPT-100 Hall thruster using the particle-in-cell method.We describe a two-dimensional model in cylindrical coordinates in which the axial and azimuthal directions arekept, neglecting variations in the radial direction. Our numerical simulations show that the instability induces a large-amplitude wave in the azimuthal electric field and the ion density, as expected. We proceed by character-izing the frequency and wavenumber of this instability using a spectral analysis, and compute power-laws in the resulting power spectra. Our results demonstrate that the plasma in a Hall thruster displays a turbulent behaviorwith an energy cascade induced by the E × B electron drift instability. We also show that the microturbulence ischaracterized by an inertial subrange which extends to scales smaller than 1 mm. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6256 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6256/5305

oai:publicacoes.softaliza.com.br:article/6257 2024-07-10T10:58:13Z cilamce2020:ART

Final results of topology optimization of a stringer using MATLAB program and comparison with Ansys software. Da Silva Maschietto. Julia Araujo da Silva. Marcelo Otimização MATLAB Elementos Finitos Ansys Esta pesquisa tem como intuito apresentar o resultado final das otimizações realizadas nos softwaresAnsys® e MATLAB. Calculou-se as tensões máximas e mínimas em ambos os softwares a fim de realizarotimizações a partir de dois métodos: redução de energia e espessura comparando-as com a Otimização Topológicado software Ansys Mechanical e otimização paramétrica do software Ansys AIM. Após a coleta dos resultados,os resultados serão apresentados e por fim, a apresentação de sugestões para trabalhos futuros. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6257 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6257/5306

oai:publicacoes.softaliza.com.br:article/6258 2024-07-10T10:58:13Z cilamce2020:ART

Paulistinha Design Review De Aguiar, J.B Gagliardi, G De Aguiar, J.M Paulistinha airplane drawing model stress-strain analysis failure Paulistinha was the first airplane developed and constructed in industrial form in Brazil. It was inspiredin the initial designs of the Taylor Cub in US, having however several differences, to accommodate localtechnological possibilities, mostly. It resulted from a semi-empirical approach, having suffered many changesduring its long maturation life, from its start in Ipiranga, São Paulo in the 1930 ́s up to the end of its serialfabrication in Botucatu, in the late 1970 ́s. In this research starting, from the drawings of the airplane, a modelof the structure is constructed. Wings and fuselage are compiled to detail, from local measures in a real airplane.A model is then developed in computer, from the drawings, to ascertain aerodynamic and structuralcharacteristics. Finite element procedures are used in the analysis. Results show large safety values and thereforemargins for improvements with the model. Its concept may be extended to new planes using alternativepropulsion, construction materials and applications including the much required versatility of hydroplanes. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6258 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6258/5307

oai:publicacoes.softaliza.com.br:article/6259 2024-07-10T10:58:13Z cilamce2020:ART

Smooth Second-Order Sliding Mode Flight Control of an Ellipsoidal Multirotor Airship Jorge A. Ricardo Jr Davi A. Santos Sliding mode control multirotor airship flight control function homogeneity This work is concerned with the robust attitude and position tracking control of a multirotorairship subject to a smooth model uncertainty representing unknown aerodynamics coefficients and addedmass. The vehicle is assumed to be full-actuated. To tackle this problem, we present a multi-inputformulation of a smooth second-order sliding mode control strategy with stability guaranteed on the basisof vector field homogeneity. The method is evaluated using numerical simulation and shows effective. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6259 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6259/5308

oai:publicacoes.softaliza.com.br:article/6260 2024-07-10T10:58:13Z cilamce2020:ART

Suboptimal Control on Nonlinear Satellite Simulations using SDRE and H-infinity Alessandro Gerlinger Romero Luiz Carlos Gadelha de Souza Nonlinear control SDRE H-infinity The control of a satellite can be designed with success by linear control theory if the satellite has slowangular motions. However, for fast maneuvers, the linearized models are not able to represent all the perturbationsdue to the effects of the nonlinear terms present in the dynamics which compromises the system’s performance. Therefore, a nonlinear control technique yields better performance. Nonetheless, these nonlinear control tech-niques can be more sensitive to uncertainties. One candidate technique for the design of the satellite's control law under a fast maneuver is the State-Dependent Riccati Equation (SDRE). SDRE provides an effective algorithm forsynthesizing nonlinear feedback control by allowing nonlinearities in the system states. The Brazilian National Institute for Space Research (INPE, in Portuguese) was demanded by the Brazilian government to build remote-sensing satellites, such as the Amazonia-1 mission. In such missions, the satellite must be stabilized in three-axes so that the optical payload can point to the desired target. Although elsewhere the application of the SDRE tech-nique has shown to yield better performance for the missions developed by INPE, a subsequent important question is whether such better performance is robust to uncertainties. In this paper, we investigate whether the applicationof the SDRE technique in the AOCS is robust stable to uncertainties in the missions developed by INPE. Moreover,in order to handle such uncertainty appropriately, we propose a combination of SDRE with H-infinity based on aleft coprime factorization. In such a way that the attention is moved to the size of error signals and away from thesize and bandwidth of selected closed-loop transfer function. The initial results showed that SDRE controller isrobust to 5%, at least, variations in the inertia tensor of the satellite. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6260 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6260/5309

oai:publicacoes.softaliza.com.br:article/6261 2024-07-10T10:58:13Z cilamce2020:ART

Effects of Geometric Nonlinearities on the Dynamic Characteristics of Portal Frames Paulo E S Santos Reyolando M L R F Brasil geometric stiffness modal analysis Rayleigh’s Method Finite Element Method In this paper, we present a study of the effects of the presence of large compressive axial forces appliedto members of portal frames on their vibration frequencies. It is a well-known fact that axial forces in structuralmembers may affect the so-called geometric stiffness. If they are compressive, the overall stiffness will decrease,and, as a consequence, the vibration frequencies also.Our structural model is a simple portal frame composed of two upright columns fixed at their bases supporting ahorizontal beam pinned at both ends. We suppose a motor to be mounted at the beam mid span. The naturalfrequencies of vibration of the structure will usually be set far away from the machine nominal operational speedto avoid possible resonance due to motor unbalance. But if large axial forces are applied to the portal framemembers changing their geometric stiffness and frequencies, unexpected resonances may occur, potentiallydangerous.Two analysis are carried out. First, a simplified mathematical model is derived using simple Rayleigh’s Methodconsiderations. Next, a more refined Finite Element model is implemented. Results agree reasonably well. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6261 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6261/5310

oai:publicacoes.softaliza.com.br:article/6262 2024-07-10T10:58:13Z cilamce2020:ART

Passive Control of HALE Aircraft Wings with Tuned Mass Dampers Victor Casulli de Oliveira Reyolando M. L. R. F. Brasil Hale Aircraft Vibration TMD's Dynamic analysis In this paper we study the control of vibrations of a HALE aircraft wing using TMD devices. Thestructure was modeled using a commercial structural analysis software. The wing profile and materialcharacteristics used were provided in available literature. Aerodynamic loads of random nature are simulated.When the first natural frequencies of the structure are close to the aerodynamic loads frequencies it can lead tounsafe flying conditions due to resonance. In addition, it can shorten the frame life due to material fatigue andfurther maintenance may be required. Processing suggests the presence of accelerations above the desired oranticipated by several international standards on the subject. To mitigate them, passive vibration absorber (TMD's,Tuned Mass Dampers) control is proposed for vertical and lateral vibrations. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6262 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6262/5311

oai:publicacoes.softaliza.com.br:article/6263 2024-07-10T10:58:13Z cilamce2020:ART

Dynamic Effects of Moving Loads on Structures Baddyo K. S. P. Silva Reyolando M. L. R. F. Brasil Moving loads Structural Dynamics Newmark’s method This study presents a computational analysis of the dynamic behavior of a cantilever steel beamsubjected to a moving mass and corresponding load that travels along its entire length. It aims to understand thebehavior of such a structure and to determine dynamic impacts on displacements. Present methods for structuralanalysis usually consider acting forces as static. However, structures subjected to masses whose position changeconsiderably in time need to be more carefully considered. It is essential to ensure the safety of the structure, theproper functioning of equipment and the comfort and safety of users. Consideration of the dynamic behavior of astructure allows to evaluate the results with greater reliability, since it brings the model closer to reality, as theactual masses and corresponding loads vary with time and, therefore, produce dynamic effects. Advances incomputational power and in the development of computational methods allow the design of these structures toinclude dynamic analysis, which promotes more realistic results in engineering design. Here, a discretized modelwas developed, based on the Finite Element Method, using numerical integration by Newmark’s Method for thesolution of the nonlinear 2nd order ordinary differential equations and obtaining the displacements of the structurein the time domain, to evaluate its behavior due to moving masses and loads. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6263 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6263/5312

oai:publicacoes.softaliza.com.br:article/6264 2024-07-10T10:58:13Z cilamce2020:ART

Vibration analysis of the CubeSat SPORT boom’s through a flexible multi- body model Lorenzzo Q. Mantovani Willer G. dos Santos Flavio L. Cardoso-Ribeiro Flexible multibody Non-latching mechanism Boom CubeSat SPORT (Scintillation Prediction Observation Research Task) is a 6U CubeSat being developed in a part-nership among NASA, Aeronautics Institute of Technology (ITA), National Institute for Space Research (INPE) and several U.S. universities, with its launch planned for 2021. SPORT’s scientific mission is the study of the pre-bubble conditions in space weather, which induce the formation of plasma bubbles; hence it has several instru-ments, with five of them positioned in four booms around the satellite. The boom’s opening occurs through spring mechanisms soon after its ejection from the International Space Station (ISS). These same springs keep the boom’sfinal position perpendicular to the satellite body since there are no mechanisms to lock the booms in place. Thus,periodic calibration maneuvers performed by the SPORT may induce vibration in both rigid and flexible modes ofthese booms, which can lead to interferences in the control system. These interferences can reduce the pointingaccuracy of the satellite or even make the control system unstable, which supports the need to analyze them. Thispaper presents the modeling of the SPORT as a rigid body and its mechanisms as flexible bodies using a multibodyapproach, which allows simulating the boom’s behavior in the space environment. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6264 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6264/5313

oai:publicacoes.softaliza.com.br:article/6265 2024-07-10T10:58:13Z cilamce2020:ART

Use of Third-Order Piston Theory in Panel Flutter Analysis on Composite Laminated Plates with NASTRAN Victor S. dos Santos Helio A. Pegado Panel Flutter Nastran Laminated Composite Panel Flutter is an aeroelastic instability of plates and shells of aerospace vehicles. The phenomena have recently grown of interest as the increased efforts to make supersonic and hypersonic flight viable in the upper lay-ers of the atmosphere. Many results are available in the literature using customized programs to study panel flutter with non-linear structural and aerodynamics models. In this work, the third-order Piston Theory is used in the su-personic panel flutter analysis and an evaluation of the NASTRAN capabilities. Later, the mesh convergence study and, subsequentially, the flutter analysis of a metallic and a composite laminated plate is performed. The obtainedresults show a good agreement with the literature and, therefore, demonstrate the capability of the methodologyfor the cases developed in this work. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6265 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6265/5314

oai:publicacoes.softaliza.com.br:article/6266 2024-07-10T10:58:13Z cilamce2020:ART

Lumped Element Multibody Modeling Approach for Very Flexible Aircraft Marko A. Rempel Flavio L. Cardoso-Ribeiro Fernando J. O. Moreira Very Flexible Aircraft Lumped Elements Multibody System Aeroelasticity This paper presents a modeling approach using lumped element multibody systems to describe aeroe-lastic dynamics of aircraft. The model is shown to describe geometric nonlinearities arising from large structural displacements and oscillations such as that of a very flexible wing bending under aerodynamic loads. The pre-sented approach is applied to a Goland’s wing to determine the flutter speed resulting from coupling the multibody structure to a quasi-steady aerodynamic model. Flutter velocities are comparable to those obtained using modalrepresentations for structural dynamics. Finally, the modeling appoach is shown to be scalable, parametrized andmodular, all of which could make it valuable in iterative environments such as during conceptual design phases ofvery flexible aircraft. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6266 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6266/5315

oai:publicacoes.softaliza.com.br:article/6267 2024-07-10T10:58:13Z cilamce2020:ART

Análise de sistemas aeroelásticos em regime subsônico: efeito do amortecimento viscoelástico G.F. Diniz A.M.G. de Lima M.A.D. Filho D.M. Borges Flutter controle aeroelástico materiais viscoelásticos DLM Fenômenos aeroelásticos estão presentes em várias aplicações de engenharia. O flutter é um fenômenoaeroelástico que surge da interação fluido-sólido e causa instabilidades em estruturas aeronáuticas. A aplicação denovos materiais e técnicas de construção estrutural vêm sendo utilizadas de forma conjunta para o controle deinstabilidades aerodinâmicas em estruturas flexíveis, onde modelos aerodinâmicos não estacionários sãoutilizados. Nesse sentido, o Doublet Lattice Method (DLM) se destaca por sua confiabilidade e eficácia nosestágios iniciais do desenvolvimento de aeronaves para análises aeroelásticas. Os materiais viscoelásticos sãoamplamente utilizados como mitigadores de vibrações e, portanto, no controle aeroelástico, uma vez que atuamincluindo um amortecimento adicional na estrutura. Com base nisso, o presente trabalho analisou o efeito doamortecimento viscoelástico no controle aeroelástico de estruturas tipo plate like wing engastada livre. Amodelagem do problema aeroelástico foi realizada em ambiente Matlab®, onde o comportamento aerodinâmico,modelado via DLM, foi acoplado ao comportamento estrutural modelado em elementos finitos (MEF). A presençade material viscoelástico alterou a dinâmica do sistema através da adição de massa, rigidez e a presença do efeitodissipativo inerente ao material. Houve aumento na frequência e velocidade crítica da vibração da placa tratada,demonstrando numericamente a eficiência do tratamento viscoelástico na mitigação da instabilidade. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6267 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6267/5316

oai:publicacoes.softaliza.com.br:article/6268 2024-07-10T10:58:13Z cilamce2020:ART

Wing Structural Optimization for Electric Distributed Propulsion Aircraft using Genetic Algorithm Bruno Amaral de Oliveira Hélio de Assis Pegado Optimization Electric Distributed Propulsion Spar The search for less polluting means of transport has been stimulating the development of batterieswith higher energy densities and electric motors that are more efficient. These advances have made possible theemergence of several all-electric aircraft, which make use of multiple rotors. In this sense, there was a need tocreate a methodology to be followed in the conceptual design phase, focused on aerodynamic and structural issuesthat change in this type of aircraft. These changes, such as the lack of a Gravity Center shift and the need for agreater number of engines and rotors, alters the spar, the aerodynamic flow, the number of ribs and the stiffness ofthe wing itself. In this study, the engines are distributed along the wing, aiming greater traction and less variationin the angle of attack along the wingspan. An aerodynamic model was created with these requirements, based onthe lift line theory, in order to calculate the flight load. Finally, using these values, employing routines of geneticalgorithms, the structure was optimized, adopting the spar geometry and thickness as design variables, with theobjective of minimizing weight, following the Tsai-Wu criterion and the impossibility of buckling. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6268 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6268/5317

oai:publicacoes.softaliza.com.br:article/6269 2024-07-10T10:58:13Z cilamce2020:ART

Dynamic modeling of a liquid rocket engine turbo pump rotor Sâmela Fernandes Pereira de Lima Carlos d’Andrade Souto Rotordynamics turbo-pump finite-elements Liquid propelled rocket engines present many advantages over its solid propelled counterpart: thepossibility of shutdown and re-ignition in flight and the fact that they are more efficient (greater specificimpulse). For these reasons, they are used in most satellite launching rockets. In a liquid propellant rocketengine, the oxidizer and fuel must be injected under high pressure into the combustion chamber. This can beachieved by using pressurized tanks. This solution is technologically simpler and less costly but significantlylimits the injection pressures of propellants. To obtain more powerful engines, propellants must be injected athigher pressures into the combustion chamber. This is done using a turbo pump, a high-capacity pump poweredby a gas turbine. Turbo pumps operate at high angular speeds (tens of thousands of rpm) and undergo intensedynamic loads in flight, in addition to the dynamic loads intrinsic to the operation of rotating machines.Therefore, the dynamic behavior of this type of system must be evaluated at the design stage. In this work, thetransverse displacements of a turbo pump rotor are analyzed using routines developed in the numericalcomputation software Octave. The mathematical model developed considers the rotor shaft flexible and rigiddisks. The axis is modeled using finite elements and point masses and inertias are used to represent the disks.Campbell’s diagram, response to unbalance and forces applied on bearing are obtained. The influence ofbearings positioning on the rotor unbalance response is studied. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6269 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6269/5318

oai:publicacoes.softaliza.com.br:article/6270 2024-07-10T10:58:13Z cilamce2020:ART

Impact of falling cables on bulkhead beams Victor Casulli de Oliveira Marcelo Araujo da Silva Reyolando M. L. R. F. Brasil Impact Design Steel beam In this work, 585.95 meters long falling cable will be analyze to compute its impact on a steel beam.The beam is lifted by two cranes and used as a shield to protect structures under the cables, during its installation.Using energy conservation concepts, it is possible to find the impact force on the beam, and with that, dimensionwhich is the ideal metallic profile to support such impact. A model was also developed using the STRAP software,via Finite Element Method, to perform a more refined analyze and check the design of the metal beam. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6270 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6270/5319

oai:publicacoes.softaliza.com.br:article/6271 2024-07-10T10:58:13Z cilamce2020:ART

Regulador Linear Quadrático iterativo para Controle de Atitude de um Quadricóptero Iago S. Vieira Aniel S. Morais Iteractive Linear Quadratic Regulator (iLQR) Unmanned Aerial Vehicle Dynamic Model The quadrirotor is an aircraft which has a vertical takeoff and landing. Due to the mechanical simplicitymany papers have been published recently, proposing numeric methods to increase the reliability on flights. Thiswork presents the development of a dynamic model of a quadcopter that was obtained from the Newton-Eulerformalism and also the development of a control system using iLQR (iteractive Linear Quadratic Regulator) witha time variant system considering the gyroscopic effect generated by the angular velocity from the frame. Themethod must be able to stabilize and act on the trajectory compliance of a quadcopter. The model was built inSolidWors to extract the moments of inertia required for the mathematical model and the prototype was built byhand using aluminum profiles and brushless motors A simulation was developed on the MATLAB®️ platform fromthe model obtained to check the proposed control, and then analyze the experimental flights, where thesimplifications on the mathematical model will be verified.. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6271 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6271/5320

oai:publicacoes.softaliza.com.br:article/6272 2024-07-10T10:58:13Z cilamce2020:ART

Nonlinear Receding Horizon Guidance of a Thrust-Vectoring Quadrotor Under Control Allocation Constraints Jose Agnelo Bezerra Davi A. Santos Multirotor aerial vehicle control allocation wayset-based guidance model predictive control The present work deals with the guidance of a pre-stabilized thrust-vectoring quadrotor, which is re-quired to be steered from its initial condition to a given state-based wayset. To tackle this problem, we adopt a receding horizon strategy based on a constrained nonlinear programming, whose crucial constraints are the controlmapping equation and the actuator limits. The online optimization solution is calculated using sequential quadraticprogramming. The proposed method is evaluated using computer simulation, which shows its effectiveness. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6272 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6272/5321

oai:publicacoes.softaliza.com.br:article/6273 2024-07-10T10:58:13Z cilamce2020:ART

Attitude Tracking Control for a Quadrotor Aerial Robot Using Adaptive Sliding Modes Jorge A. Ricardo Jr Davi A. Santos Tiago Roux de Oliveira Adaptive sliding mode control quadrotor attitude control multirotor aerial vehicle This work is concerned with the design and analysis of the attitude control law for a quadrotor aerialvehicle, under bounded external disturbances and model uncertainties with unknown bounds. First, the vehicle rotational kinematics and dynamics are modeled in terms of well-defined Gibbs vector and angular velocity rep-resenting the control errors. To tackle the problem, we propose a first-order multi-input adaptive sliding mode control strategy based on an adaptation law for the switching gain matrix. This adaptive gain matrix is proved to converge to its maximum bound and the existence of an ideal sliding mode is guaranteed. The main contribu-tions are: 1) the geometric dynamic modeling in SO(3) for the attitude control error using Gibbs vector; and 2) the extension of a switching gain adaptation law originally proposed for single-input systems to a more generalmulti-input formulation. The method is evaluated by numerical simulations, using IMAV-M, which is a recentlydeployed open-source flight control simulator for multirotor aerial vehicles (MAVs). In an ideal scenario, withoutmeasurement noise (or estimation errors) and small sampling time, the method shows to be effective and easy toimplement and tune. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6273 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6273/5322

oai:publicacoes.softaliza.com.br:article/6274 2024-07-10T10:58:13Z cilamce2020:ART

Adaptive Universal Integral Regulator For Flight Control - A Preliminary Study Rafaella Barreto Campos Yohan Díaz-Mendez Marcelo Santiago de Sousa Sebastiao Simões Cunha Jr Universal Integral Regulator Adaptive UIR Flight Control Adaptive Gain This article proposes a new treatment for the design of the Universal Integral Regulator (UIR). The UIRis a non-linear control technique based on sliding mode control with the inclusion of a Conditional Integrator (CI).The main tuned gain of this control law is constant in the original approach, in the present work we propose to makethis gain dependent on the tracking error (adaptive gain). The performance of this change will be demonstrated ina flight control case, performance indexes will allow to quantitatively compare its performance with the originalone. Simulations results show a superior performance of the UIR after the proposed gain modification, called atthis work as Adaptive UIR (AUIR) XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6274 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6274/5323

oai:publicacoes.softaliza.com.br:article/6275 2024-07-10T10:58:13Z cilamce2020:ART

Influência da Flambagem Termomecânica na Otimização de Rotas de Dutos Submarinos Vinicius Cantarino Curcino Edgar Stonyo Bernardo Micolo Juliana Souza Baioco Breno Pinheiro Jacob Djalene Maria Rocha Pipeline Buckling, Routes Optimization Subsea The planning of subsea pipeline routes has great relevance for exploration and production projects,as they ensure a safety operation of subsea systems. With the advance of oil exploration in deep and ultra-deepwaters, which means a rise in the operation severity, where the equipment works in an environmental with highpressure and temperature levels. These factors can lead the large vertical or lateral displacement in the pipelineinitial condition (as laid), that is because the temperature variations leading to the occurrence of the phenomenonof thermomechanical buckling. The aim of this work is to study the weight of buckling in pipelines submitted byHT / HP (high temperature / high pressure) flow in the penalty criteria on submarine pipeline route synthesis andoptimization tools, using evolutionary algorithms. In ways to do a better representation of buckling, the pipelinesare assumed laid on the seabed, subjected to environmental loading as current and passive soil resistance duethe soil mobilization around the pipe, with or without thermal coating, and also with a hot internal fluid. Once theclassic formulation of pipeline buckling proposed by Hobbs is based in an infinite rigid soil, in this work a modifiedHobbs formulation is considered, so this secure that the resistance and all intrinsic penetration soil properties arerepresented. Thus, a safety factor indicated in the practical recommendation of DNV-OS-F101 and DNV-RP-F110is calculated and compared with the limit safety factor pre-established in the project. With the results obtainedby the pipeline section defined in the project, a depth profile graph is generated showing the critical sectionsconsidering the buckling. In this way, the tool assists the designer in the assessment of submarine pipeline routesconsidering thermomechanical criteria and environmental factors. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6275 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6275/5324

oai:publicacoes.softaliza.com.br:article/6276 2024-07-10T10:58:13Z cilamce2020:ART

Evaluation of Composite Hull for Subsea Separator Rodrigo Duarte Ribeiro Marysilvia Ferreira da Costa Ilson Paranhos Pasqualino Olga M. O. de Araújo subsea separator composite material water absorption aramid fiber numerical simulation The subsea separator is one of the most important equipment to subsea processing, since it is responsiblefor separating the fluids extracted from the reservoir. The separation module may be composed by injection bombsand several other equipment, besides the separator tank, which makes it a huge structure. Since it is made of steel,the separator hull is extremely heavy and expensive, requiring very specific and expensive crane vessels forinstallation. Composite materials made of polymeric resins and fibers usually have very low density compared tosteel, good mechanical properties, which make them a feasible alternative to weight reduction without losingstructural safety. Therefore, it is important to evaluate its mechanical properties under the operational conditionsto validate the proposed application. This work evaluated salt water absorption of composite plates underconditions of 3000 psi of external pressure and temperature of 4oC. Tensile and shear tests were performed toassess the influence of water absorption on the resistance and elastic and shear moduli of the material. A numericalmodel was also developed to evaluate the behavior of the structure under different levels of external pressure andto compare a metallic with a composite hull. It was possible to conclude that the absorption did not causesignificant changes on the elastic and shear moduli nor on the tensile strength of the material. In addition, thenumerical results showed that, for the same external pressure, the composite hull has a thicker wall and a lowermass when compared with a metallic one. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6276 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6276/5325

oai:publicacoes.softaliza.com.br:article/6277 2024-07-10T10:58:13Z cilamce2020:ART

Design and fatigue assessment of gravity base foundations for offshore wind turbines Gabriel Nogueira Fellipe A. Gomes Eduardo Dorscheidt Gilberto B. Ellwanger Wind turbine Gravity base foundation Ultimate limit state Fatigue limit state In this work, a gravity base foundation (GBF) was designed to support the DTU’s 10 MW wind turbine.Recently, the industry is considering GBFs as a potential solution to the difficulties of driving monopilefoundations in certain types of soil. Also, checking their feasibility in greater water depths is a pivotal questionsince these concrete structures might be cheaper than the steel monopile alternative. Thus, in a 40 meters waterdepth, the proposed model is checked for its geotechnical capacity and the resistance of critical points underextreme loads. The foundation is designed with a natural frequency that avoids excessive fatigue damage due tothe action of Brazilian environmental loads and rotor operation frequencies. This paper discusses the mostinfluential factors in these analyses. Palmgren-Miner rule assessed the fatigue damage in association with thewidely employed S-N curves for concrete. SIMA-RIFLEX’s dynamic analysis module generated the stress timeseries. Rainflow method, combined with the Markov matrix, is utilized for counting stress cycles. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6277 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6277/5326

oai:publicacoes.softaliza.com.br:article/6278 2024-07-10T10:58:13Z cilamce2020:ART

Numerical model for analysis of the load attenuation on mooring lines in catenary system Eduardo. G. Rosa Marcelo. M Rocha anchor-chain interaction mooring line load attenuation inverse catenary With the advancement of oil exploration at greater depths, the solution to maintain offshore platformsin place has changed from a traditional rigid system to a flexible system formed by mooring lines. Usually, amooring line consists of an anchor chain attached to the floating unit in the upper end and the anchor or foundationelement at the lower end, which implies that, along its length, the chain is not only submerged in water but alsoembedded in soil. Experimental investigations conducted on reduced scale have shown that the load applied at the embedment point located on the seabed surface does not reach the same magnitude at the anchoring point. The so-called “load attenuation” is related to the inverse catenary shape developed by the mooring line embedded in the soil, providing a transversal reaction force and longitudinal friction force in the soil-chain interface. In order toevaluate the problem from a numerical point of view, an initial 3D finite element model of the anchor chainembedded in marine soil was built in the ANSYS software. As a starting point, the anchor chain behavior is adoptedas elastic, the soil is considered perfect elastoplastic with Drucker-Prager yield criterion and the contact interfaceis simulated by Coulomb’s law of friction. The load attenuation levels obtained for several cases are compared toreference results, both experimental and numerical, and the stress disturbance in soil is presented in terms of vonMises equivalent stress. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6278 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6278/5327

oai:publicacoes.softaliza.com.br:article/6279 2024-07-10T10:58:13Z cilamce2020:ART

UNVEILING PATTERNS IN THE INTERACTION BETWEEN RISERS AND SEABED Edgar Stonyo B. Micolo Anderson Barata Custódio Riser-Soil Interaction Finite Elements Non-Dimensional Analysis Risers play an important role in offshore production systems by conveying oil, gas and other fluids fromsubsea wells to floating production units (FPU) or vice versa. Free hanging (catenary) risers using flexible pipeshave been the most conventional configuration in Brazilian production assets, but the participation of steel catenaryrisers has long been fostered by oil companies and their technological partners. The most challenging sections offree hanging risers are the vicinity of their top end and the touchdown zone (TDZ). This investigation focuses onthe latter section, by examining the static interaction between riser and seabed, which is described by Skempton’sbackbone curve. Besides the external pressure and possible wall compression, the curvatures often impose thestrongest constraints to the riser design space. Parametric studies using finite element methods, non-dimensionalanalysis and statistics seem to be promising route to assess the riser response. The results documented herein arelimited to static response with no marine current or wave loads, focusing on the maximum curvature along theTDZ, and they supply zero-order approximations to studies which aim at describing the dynamic response usingasymptotic approximation techniques. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6279 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6279/5328

oai:publicacoes.softaliza.com.br:article/6280 2024-07-10T10:58:13Z cilamce2020:ART

Fatigue analysis of gravity-based foundation supporting a 10 MW OWT considering small-strain stiffness of soils Eduardo Dorscheidt Fellipe A. Gomes Gabriel Nogueira Gilberto B. Ellwanger gravity-based foundation soil-structure interaction hardening soil offshore wind turbine In the past few years, gravity-based foundations (GBF) proved to be an advantageous solution forsupporting offshore wind turbines (OWT) when soil conditions represent a hindrance to deep foundations asmonopiles. In this type of support structure, soil-structure interaction (SSI) interferes directly in system stiffness.The available standard formulations are still based on the Theory of Elasticity and do not contemplate some soilproperties, as its hardening effects when subjected to plastification. This paper aimed to investigate the influenceof an elasto-plastic soil model such as HSS (Hardening Soil with Small-Strain Stiffness) in a coupled fatigueanalysis of concrete, a critical point of GBF structural design, considering a 10 MW OWT. The results of theproposed analysis showed low influence of small-strain stiffness, but a significant role of plasticity and hardeningeffects. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6280 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6280/5329

oai:publicacoes.softaliza.com.br:article/6281 2024-07-10T10:58:13Z cilamce2020:ART

Post-failure behavior of long wires under dynamic pulse buckling Bergson S. Matias Jonas Aguiar Jr. Evandro Parente Jr. A. Macario C. de Melo Anderson B. Custodio Dynamic Buckling Nonlinear Dynamics Finite Element Analysis The phenomenon of dynamic pulse buckling, which can appear with the failure of long slender structuresunder tension, as offshore structures such as risers, has drawn the attention of the interest of researchers dueto accidents and the damage they can cause to the environment. The risers connect floating units to flowlinesand other equipment on the seabed and are used for drilling and exploration of oil and gas. Experimental andnumerical researches have been conducted in reduced wire models to study post-failure behavior, mainly after thecompressive elastic unloading wave reaches the fixed end, being reflected and giving rise to a buckling locatednear this end. This work addresses the finite element modeling and simulation of dynamic pulse buckling inwire failure tests. An elastoplastic model with linear hardening is adopted for the material behavior. Explicit andimplicit integration algorithms are used for nonlinear dynamic analysis considering 2D and 3D beam elements withlarge displacements and strains. The effects of the finite element type, mesh discretization, integration algorithm,geometric imperfections, numerical damping, wire length, and time step in the post-failure behavior are assessedand the implications of these results for the simulation of post-failure analysis of marine risers are discussed. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6281 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6281/5330

oai:publicacoes.softaliza.com.br:article/6282 2024-07-10T10:58:13Z cilamce2020:ART

USING METAMODELS TO PREDICT CUTTING FORCES IN BOP Nikolas Lukin Larissa Driemeier Offshore drilling BlowOut Preventer Finite Element Method Cutting drill string inside BOP (BlowOut Preventer) may be required if Dynamic Positioning Systemfails to maintain an offshore drilling platform at a fixed point in the ocean. The required force to cut the string istraditionally determined by analytical models and commissioning tests, which can be far from the real situations.Depending on boundary conditions of this tubular, the BOP may fail to cut it, which can lead to catastrophic events.In this way, the proposed work aims to define a metamodel to predict required forces for BOP to cut API S-1356.63’’ 40.87 ppf drill pipes, with different boundary conditions. Simulations were performed using FEM, withmaterial and failure modelled according to Johnson-Cook model (1986), with parameters obtained from literature.Different simulations in combined conditions, including initial traction and torque, pipe decentralization and ramoffsetting, were performed in order to find the required force in indentator to cut the pipe. Such data were used todevelop a metamodel using feed a machine learning algorithm and its results were validated with real test data.Situations with more realistic boundary conditions concludes that current BOP cutting models may underestimatethe required force. XLI Ibero-Latin American Congress on Computational Methods in Engineering 2024-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2020/article/view/6282 XLI Ibero-Latin American Congress on Computational Methods in Engineering; v. 2 n. 02 (2020): XLI Ibero-Latin American Congress on Computational Methods in Engineering por https://publicacoes.softaliza.com.br/cilamce2020/article/view/6282/5331 aa015788b2b913d2110a156b7c8c5796