2026-09-13T07:10:47Z https://publicacoes.softaliza.com.br/cilamce2023/oai

oai:publicacoes.softaliza.com.br:article/4840 2024-05-11T12:12:37Z cilamce2023:M1

Dynamic buckling of slender variable section members to self-weight Reyolando M.L.R.F. Brasil dynamic stability self-weight Rayleigh’s Method optimization We present a study of the dynamic buckling of variable section very slender members due to their self-weight. Modern materials and powerful new analysis methods are leading to the design of very slender aerospace structures that may be prone to instability issues. Elastic stability of such structural systems is a problem inside thescope of Non-Linear Dynamics Analysis Methods. An indicator of instability is when the structure's free vibration frequency tends to zero. Two factors affect these frequency results. First the stiffness, composed of elastic stiffness, always positive and non-zero, that diminishes rapidly with height, and the geometric stiffness, negative for compressive forces, whose absolute value grows as the structure gets taller and heavier. Second, the mass, that also grows with the height of the structures, and is always positive. To access this behavior, we present a one-degree-of-freedom mathematical model of a cantilever vertical member via Rayleigh's Method, adopting a cubic polynomial as shape function. Closed form formulas are obtained for elastic and geometric equivalent stiffness, aswell as for equivalent mass, dependent on the member length and transverse section variable characteristics. For some adopted numerical geometric and material properties we use an optimization algorithm to maximize the member length. Check of the formulation is possible for the prismatic member case. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4840 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4840/abmec2023 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4868 2024-05-11T12:12:36Z cilamce2023:M1

QUAD LAMINATES AEROELASTIC INSTABILITY QUAD LAMINATES AEROELASTIC INSTABILITY' Helio de Assis Pegado panel flutter orthotropic panel quad laminates aeroelastic instability The flutter in panels of rockets, missiles, and vehicles was identified when technological advances al-lowed these vehicles to reach supersonic and hypersonic speeds. The phenomenon was first noticed and recognized during World War II, when the German V2 rockets were being developed. The initial studies used the Ritz and Galerkin approach based on a linear aerodynamic and structural model intended to determine the critical dynamic pressure. Researchers started using nonlinear structural models with a nonlinear aerodynamic model and obtain-ing the limits cycle oscillation (LCO) due to computer advances and the growing use of matrix techniques, such as finite elements. In the last ten years of the previous century, structural components and aircraft wings began to utilize composite materials like carbon and glass fiber on a large scale. Thus, the researchers began to verify the impact of using these materials on structures subject to this instability. This paper investigates the aeroelastic stability of laminate panels in supersonic flow. It is optimized to obtain the best fiber direction and number of layers to increase the critical dynamic pressure. The researchers discovered that quadriaxial laminates with prede-termined directions have several advantages over others. In order to reduce flutter, the impact of employing quad laminate sets will be examined and contrasted with that of alternative configurations. The analysis is performed using a specially customized program. Finally, the results are compared with the literature, and the differences areanalyzed. The flutter in panels of rockets, missiles, and vehicles was identified when technological advances al-lowed these vehicles to reach supersonic and hypersonic speeds. The phenomenon was first noticed and recognized during World War II, when the German V2 rockets were being developed. The initial studies used the Ritz and Galerkin approach based on a linear aerodynamic and structural model intended to determine the critical dynamic pressure. Researchers started using nonlinear structural models with a nonlinear aerodynamic model and obtain-ing the limits cycle oscillation (LCO) due to computer advances and the growing use of matrix techniques, such as finite elements. In the last ten years of the previous century, structural components and aircraft wings began to utilize composite materials like carbon and glass fiber on a large scale. Thus, the researchers began to verify the impact of using these materials on structures subject to this instability. This paper investigates the aeroelastic stability of laminate panels in supersonic flow. It is optimized to obtain the best fiber direction and number of layers to increase the critical dynamic pressure. The researchers discovered that quadriaxial laminates with prede-termined directions have several advantages over others. In order to reduce flutter, the impact of employing quad laminate sets will be examined and contrasted with that of alternative configurations. The analysis is performed using a specially customized program. Finally, the results are compared with the literature, and the differences areanalyzed. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4868 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4868/4027

oai:publicacoes.softaliza.com.br:article/4869 2024-04-26T12:25:29Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4871 2024-04-26T14:01:35Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4873 2024-04-26T12:30:03Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4874 2024-05-11T12:12:35Z cilamce2023:M2

Numerical Analysis of the Stresses and Behavior of Composite Castellated Beams Brenda Vieira Costa Fontes Luciano Mendes Bezerra William Taylor Matias Silva1 Steel Beams Finite Element Method Castellated Composite Structures This work has as main objective to analyze, through numerical modeling, the structural behavior of Composite Castellated Beams (CCB), with steel profile and reinforced concrete slab, in order to map the performance of the beams and the stress distribution for hexagonal castellated holes. For this, a detailed study of the CCB behavior will be done, then, based on the data obtained, a numerical modeling through the Finite Element Method (FEM) using the ABAQUS/CAE software was elaborated, and finalized with an extensive analysis of the behavior of the stresses in each type of beam modeled. This study is important because composite castellated beams are structural elements that have high strengths because they are the result of the application of various construction techniques. First, composite beams with steel profile and reinforced concrete slab increase the bending stiffness and resistance to stresses of the beam. Also, castellated beams have higher bending stiffness due to the height gain after their construction process. Therefore, the union of these techniques needs to be studied and analyze the stresses generated in the beam. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4874 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4874/4036 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4876 2024-05-11T12:12:33Z cilamce2023:M2

Optimum Design of continuous composite slab using Particle Swarm Optimization Mariana Oliveira Teixeira Élcio Cassimiro Alves Janaina Pena Soares de Oliveira Valle Adenilcia Fernanda Girobério Calenzani continuous composite slabs optimization particle swarm algorithm additional reinforcement negative reinforcement Civil construction is one of the main contributors to the emission of CO2 in the atmosphere. In the pursuit of more environmentally friendly structures, evaluating the emission of gases generated by civil construction, particularly in the manufacturing process of composite slabs, is of paramount importance. Composite slabs are typically analyzed as a succession of simply supported spans; however, due to the construction method, these structures are actually built as continuous. Considering the continuity of the slabs in composite steel and concrete systems can lead to a more optimized structural design. The aim of this paper is to determine optimal solutions for continuous composite slabs in terms of CO2 emissions. The constraints of the optimization problem are based on the design criteria of Brazilian Standards, and the solution to the optimization problem was obtained using Particle Swarm Optimization. As result, the algorithm selected slabs with thinner steel formwork, lower concrete cover, and lower rates of negative and additional positive reinforcement. Additionally, it chosen concrete with intermediate compressive strength and a rate of negative reinforcement close to lower bound. The CO2 emissions resulting from steel formwork and concrete were the most influential variables in the final problem solution. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4876 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4876/3973 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4877 2024-05-11T12:12:32Z cilamce2023:M2

Advanced Parametric Modelling of Pyramidal Trusses Jackson S. Rocha Segundo Ricardo A. M. Silveira Rafael C. Barros Dalilah Pires Ígor J. M. Lemes pyramidal trusses advanced analysis material and geometric non-linearities stability and strength Trusses are an affordable and easy solution for engineers, especially when spanning large distances. It is notorious that several aspects of trusses influence their behavior. By accounting for material and geometric non-linearities, this study examines the behavior of pyramid trusses under vertical load. Practical applications make these structures valuable as either a primary or secondary component. This study looks at how elastic and inelasticstability of pyramidal trusses are influenced by factors like focus height, base radius and number of bars. Therefore, it will be possible to identify the ideal stability and strength configurations for pyramidal trusses. The advanced nonlinear analyzes intend to use results from the literature or obtained via other softwares in the calibration of the proposed numerical models. It will be possible to perceive under what conditions the pyramidal truss presents gain and loss of rigidity, indicating alternatives for designers that envisage such structure shape. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4877 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4877/4037 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4878 2024-04-26T13:14:00Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4879 2024-05-11T12:12:31Z cilamce2023:M2

Path following strategies for non-linear analysis of steel-concrete composite sections: a bi-axial bending evaluation Pedro H.A. Lima Ígor J.M. Lemes Ricardo A.M. Silveira Rafael C. Barros Path-following strategies non-linear analysis steel-concrete composite cross-sections The present study aims at the non-linear analysis of steel-concrete composite cross-sections. The strain compatibility method (SCM) is used to describe the sections deformed shape in each step of the incremental-iterative solution process. For the full analysis of the moment-curvature relationship, the SCM is coupled to path-following strategies (adapted generalized displacement technique and adapted minimum residual displacement method) to go beyond the critical bending moment points in the construction of the relations that describe the complete cross-section mechanical behavior. Concomitantly, the strain-control strategy is implemented as an alternative numerical approach and used for comparison, since the bending moment limit points do not prevent the complete construction of the cross-section equilibrium path. The constitutive relationships are addressed explicitly, as well as the residual stresses present in the steel sections. To validate the proposed numerical formulation, the results obtained are compared with the numerical and experimental data available in the literature. To validate the proposed numerical formulation, the results obtained here are compared with the numerical data available in the literature. Additionally, the softening effect on the concrete was increased to induce descending stretches in the moment-curvature relationship, and this condition was correctly evaluated. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4879 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4879/3975 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4880 2024-05-11T12:12:31Z cilamce2023:M3

Crack detection in 2D structures using wavelet transform and the boundary element method Sá. Rafael G. Gilberto S. Ramon Boundary elements Wavelet transforms Damage detection BEMcracker2d Detecting damages in structures is of paramount importance as they can lead to the collapse of structuralelements. In the current scenario, two reliable techniques for non-destructive testing of structures, namelyultrasound and X-rays, are practically applicable for precise localization of hidden damages. However, suchtechniques are costly, time-consuming, and require special procedures to be performed. Currently, researchsuggests the possibility of using numerical methods to assist in damage detection in structures. Generally,numerical methods for damage detection, such as cracks, are based on finite element modeling and comparisonsbetween the signatures or responses of the structures before and after the occurrence of damage. This articleproposes a new approach to damage identification based on the Wavelet Transform (WT) and the BoundaryElement Method (BEM), making the numerical modeling of structures more accurate, straightforward, and withoutrequiring the structure's signature before the damage occurs. To validate the adopted methodology, a cantileverbeam containing a crack with different orientations will be modeled using the in-house programs BEMLAB andBEMCRACKER2D, as well as the algorithms implemented in MATLAB for handling wavelet coefficients anddamage localization. The obtained results indicate that WT is a useful tool for identifying and monitoring damagesin structures. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4880 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4880/4038 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4881 2024-05-11T12:12:30Z cilamce2023:M3

BemLab2D & BemCracker2D: A computational package for modeling and analyzing fracture mechanics problems with boundary elements Gilberto Gomes Iuri A. A. Lustosa Alan S. Moura crack growth bemlab2d bemcracker2d DBEM The stress analysis in structures with complex geometry as in aircraft fuselages, where geometry iscontinuously altered by crack growth, usually requires the use of numerical methods, since the presence ofcracks in the structure raises difficulties related to the modeling and, consequently, to the calculation of the stressintensity factors (SIF). In this aspect, the dual boundary element method (DBEM) has been applied in this typeof analysis, taking advantage over the FEM considered, since there is no need for continuous remeshing at eachcrack increment. Therefore, this work introduces a software written in C ++ and based on Object OrientedProgramming, called BemCracker2D, for two-dimensional analysis by DBEM for crack propagation problems inthe field of linear elastic fracture mechanics, as well as its BemLab2D GUI. Parameters as SIF, crack-growth,number of load cycles and others, will be computed and compared with examples from the open literature inorder to attest to the program's efficiency and robustness. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4881 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4881/3977 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4882 2024-05-11T12:12:29Z cilamce2023:M4

A 3-D Extension of the Multiscale Control Volume Method for the Simula- tion of the Steady-State Diffusion Equation Filipe A. C. S. Alves Artur C. R. de Souza Darlan K. E. de Carvalho Paulo R. M. Lyra MsCV MPFA-D GLS background grid steady-state diffusion problem The level of detail on modern geological models requires higher resolution grids that may render the simulation of multiphase flow in porous media intractable. Moreover, these models may comprise highly heteroge-neous media with phenomena taking place in different scales. The Multiscale Finite Volume (MsFV) method can tackle such issues by constructing a set of numerical operators that map quantities from the fine-scale domain to a coarser one where the initial problem can be solved at a lower computational cost and the solution mapped back to the original scale. Unlike more traditional techniques like homogenization and upscaling, the MsFV has the advantage of maintaining the coupling between the scales even when there is no clear scale separation. However, the MsFV formulation is limited to k-orthogonal grids since it uses a Two-point Flux Approximation (TPFA) method and employs an algorithm to generate the coarse meshes that is not capable of handling general geometries. The Multiscale Restriction Smoothed-Basis method (MsRSB) improves on the MsFV by introducing a new iterative procedure to find the multiscale operators and modifying the algorithm for the generation of the multiscale geometric entities to accommodate unstructured coarse grids, but is still limited to structured fine grids due to the TPFA discretization. Finally, the Multiscale Control Volume method (MsCV) replaces the TPFA by the Multipoint FluxApproximation with a Diamond stencil (MPFA-D) scheme on the fine-scale while further enhancing the generation of the geometric entities to allow truly unstructured grids on the fine and coarse scales for two-dimensional simulation. In this work we propose an extension to three-dimensional geometries of both the MsCV and the algorithm to obtain the multiscale geometric entities based on the concept of background grid. We also modify the MPFA-D to use the very robust Generalised Least Squares (GLS) interpolation technique to obtain the required auxiliary nodal unknowns. We show that the 3-D MsCV method produces satisfactory results even for heterogeneous and highly anisotropic media, employing true unstructured grids on both scales to handle the simulation of the steady-state diffusion equation. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4882 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4882/4025 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4883 2024-05-11T12:12:28Z cilamce2023:M4

A multiscale finite element method for simulating flow in fractured porous media Nathan Shauer Pedro Lima Jose B. Villegas S. Philippe R. B. Devloo Discrete Fracture Networks Porous Media Flow Multiscale Method Mixed Finite Elements This work extends on Duran et al. [1] to propose a multiscale locally conservative finite element method ́for the simulation of flow in fractured porous media. The method employs H(div)-confirming flux approximationsthat carry advantages such as the ability to solve problems with nearly incompressible materials, better accuracyfor the velocity field approximation, fewer requirements on the regularity of the solution, and continuity of thenormal velocity between elements. The last of these leads to locally conservative approximations of the velocityfield, which is considered paramount in the area of reservoir simulation. The flow in the porous media is modeledusing traditional Darcy’s law, and the coupling with the fracture flow is modeled with the Discrete-Fracture-Matrixrepresentation, where the fractures are idealized as lower-dimensional elements at the interface of matrix elements. The method is applied to a benchmark problem of a complex reservoir with several fractures. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4883 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4883/3978 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4884 2024-05-11T12:12:27Z cilamce2023:M2

In recent decades, the increasing of slenderness in buildings structural design has been relevant leading to the reduction of the natural frequencies values and the damping levels, resulting in excessive vibrations and human discomfort, in some situations Jean Carlos Mota Silva Juliana Mattos Farias José Guilherme Santos da Silva tall buildings geometric nonlinearity buildings dynamic analysis aerodynamic damping In recent decades, the increasing of slenderness in buildings structural design has been relevantleading to the reduction of the natural frequencies values and the damping levels, resulting in excessivevibrations and human discomfort, in some situations. Having in mind the current day-to-day project practiceaiming to determine the dynamic structural response of tall buildings, two aspects are generally disregarded,associated to the effect of the geometric nonlinearity and the aerodynamic damping. Therefore, this researchwork aims to assess the dynamic structural behaviour of a steel-concrete composite building with 48 floors and172.8 m height, when subjected to wind nondeterministic actions, including in the dynamic analysis the effectsof the geometric nonlinearity and the aerodynamic damping. The building numerical model was developed toobtain a realistic representation of the analysed structural system, based on the Finite Element Method (FEM),through the use of the ANSYS software. The conclusions of this study, obtained based on the displacements andaccelerations values, pointed out to the fact that the effect of the geometric nonlinearity led to relevantdifferences on the dynamic structural response of the investigated building. On the other hand, the contributionof the aerodynamic damping was not significant. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4884 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4884/3979

oai:publicacoes.softaliza.com.br:article/4887 2024-04-26T12:53:17Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4888 2024-05-11T12:12:25Z cilamce2023:M4

A Multipoint Flux Approximation Method Based Of Harmonic Points (MPFA- H) For The Numerical Simulation Of Coupled Poroelastic Problems Pedro Victor Paixao Albuquerque Jonathan da Cunha Teixeira Lucıolo Victor Magalhaes e Silva Gustavo Lenin Souza Santos Pacheco Fernando Raul Licapa Contreras Paulo Roberto Maciel Lyra Darlan Karlo Elisario de Carvalho Geome- chanics Finite Volume Method Multipoint flux approximation Poroelasticity Reservoir Simulation Reservoir simulation is an important tool for the prediction of oil and gas production. However, somephysical phenomena were either neglected or oversimplified in the simulations, in order to facilitate the processof developing a simulation tool to analyze the fluid flow within the rock reservoir. One such phenomenon is themechanical behavior of the reservoir and surrounding rocks, and how it affects rock properties, and consequently,the fluid flow behavior through the porous media, which, in turn, influences its mechanical behavior, since fluidpressure contributes to the rock deformation. These effects are well observed in wellbore stability and reservoirsubsidence, as both can severally change the production behavior, if not considered. In this work, Biot’s theory ofconsolidation is used to derive the governing equations of both the process of rock deformation and fluid flow inthe porous rock and their coupling. In the petroleum reservoir community, usually, these problems are solved using different numerical methods: The Finite Element Method (FEM) is used for the geomechanics problem while the Finite Volume Method (FVM) is employed for the fluid flow problem. However, in the present paper, we propose a full finite volume formulation for both problems based on the use of the Multi-Point Flux Approximation using Harmonic Points (MPFA-H), which was extended to handle the geomechanical problem. The MPFA-H method is very robust and flexible. Using the same basic strategy for both problems has the advantage of producing a locally conservative formulation, which is important for multiphase flow modeling, and the use of the same data structure which eases the simulation tool development, is expected to increase numerical stability, accuracy, and simulation speed. We use a sequential solution method in which the equations for solid deformation and fluid flow are solved separately and the solutions of each problem exchange information in all time steps, using the fixed-strain split. The solutions obtained with the strategy described are verified using benchmarks found in literature. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4888 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4888/4040 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4889 2024-05-11T12:12:24Z cilamce2023:M4

Numerical assessment of pressure, velocity, and stress post-processing strate- gies for the Biot’s problem Giovanni Taraschi Maicon R. Correa Finite Element Method Post-processing strategies Biot’s problem In the context of the displacement-pressure formulation for the Biot’s problem, the present work ex-plores some possibilities of Finite Element post-processings to improve the accuracy of the pressure field, the Darcy velocity, and the effective stress. Numerical experiments illustrate the performance of the different strategies and compare their results with the native approximations obtained through the use of the lowest-order Taylor-Hood space in the displacement-pressure Galerkin method. Our results indicate that the post-processing strategies pre- sented significantly improve the approximation of the velocity and effective stress fields. The pressure field, on the other hand, does not benefit as much from the strategies considered here. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4889 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4889/4047 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4890 2024-05-11T12:12:24Z cilamce2023:M4

A methodology to evaluate fluid-dynamic forces on immersed bodies in 3D fluid flow problems André S. Müller Eduardo M. B. Campelo Henrique C. Gomes fluid-dynamic forces immersed boundary techniques Nitsche’s method finite element method This work presents first results on a methodology to evaluate fluid-dynamic forces on immersed bodiesin three-dimensional fluid flows resolved through the finite element method (FEM). A classical Eulerian approachis followed to describe the fluid (assumed incompressible through the Navier-Stokes equations). The fluid-bodyinterface is treated through Nitsche’s method, which is an immersed boundary technique with which weconsistently impose the Dirichlet boundary conditions in a weak form. In order to assess the accuracy andefficiency of the developed scheme, a numerical simulation of a 3D benchmark stationary flow of anincompressible fluid is performed. This work refers to an intermediate stage of a doctoral research that aims tomodel fluid flows with immersed particles with consistent fluid-particle interaction and particle-to-particlecontacts, as observed in many particle-laden fluid applications. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4890 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4890/4032 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4891 2024-05-11T12:12:22Z cilamce2023:M4

An improved embedded finite element formulation for investigating fluid flow behavior in fractured porous media Danilo B. Cavalcanti Cristian Mejia Deane Roehl Luiz F. Martha Ignasi de Pouplana Guillermo Casas Embedded finite element fluid flow in porous media barriers Discontinuities, such as fractures and geological faults, are present in several geological models where a fluid flow analysis is performed. In cases where the discontinuity filling material has a lower permeability than the matrix, this discontinuity will act as a barrier to fluid flow in the porous media. On the other hand, fluid flow is enhanced in the absence of filling material or in the highly porous case. Embedded formulations have become attractive to model discontinuities over the last decades since they do not require mesh conformity. However, the literature lacks a formulation fully developed in the context of the Finite Element Method capable of modeling discontinuities that act like barriers to fluid flow in transient problems. This paper presents an improved embedded finite element formulation to investigate fluid flow behavior in fractured porous media. The proposed approach includes additional degrees-of-freedom representing the pressure drop between fracture surfaces and the fluid pressure within the fracture. Single-phase flow is considered. Darcy’s law governs fluid flow through the porous media, while the cubic law of parallel plates controls the fluid flow inside the fracture channel. A numericalexample comparing the results with a model with interface elements modeling the discontinuity is compared tothe embedded formulation. The numerical results demonstrate the capability and limitations of the proposedapproach to capture the influence of discontinuities on fluid flow behavior in porous media. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4891 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4891/3981 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4892 2024-05-11T12:12:21Z cilamce2023:M4

A Multipoint Flux Approximation Method based on Harmonic Points to Simulate Highly Heterogeneous and Anisotropic Aquifers Fernando R. L. Contreras Darleson L. A. Oliveira Paulo R. M. Lyra Alessandro R. E. Antunes Darlan K. E. Carvalho Groundwater Hydraulic head Finite volume method MPFA-H Currently, groundwater has become an essential natural resource for human consumption, particularly in arid regions. It is well-known that aquifers have very complex geological characteristics due to the presence of zones of low permeability, vugs and fractures. The geological complexity and the presence of strongly coupled terms in the mathematical models make it difficult, if not impossible, to obtain an analytical solution, and solving this class of problem is a challenge for the hydraulic engineer. In this sense, computer simulators supported by numerical methods have become a fundamental tool for dealing with these mathematical models. Currently, in the context of numerical simulation of fluid flow in aquifers, several classical numerical methods are used in most commercial simulators such as FEFLOW, MODFLOW, and HydroGeoSphere. However, it is well known that these classical methods cannot deal with complex physical phenomena and can lead to inconsistent approximate solutions. In this sense, in the present work, the hydraulic head equation of the aquifer is solved for the first time using a cell-centered finite volume method, where the spatial and temporal terms are solved using the multi-point flux approximation method based on harmonic points (MPFA-H) and the backward Euler or Crank-Nicolson schemes, respectively. In this context, the MPFA-H method is characterized by being globally and locally conservative, piecewise-linear, and able to deal with highly heterogeneous and anisotropic porous media. Moreover, the harmonic points are calculated from physical and geometrical parameters, which allows a piecewise-linear solution and guarantees the positivity of the interpolation weights of the hydraulic head on the control surface of the computational mesh. The results show that the proposed method provides high accuracy and efficiency in groundwater simulation. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4892 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4892/3982 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4893 2024-05-11T12:12:20Z cilamce2023:M5

Towards a general multiscale methodology for the simulation of thermal behavior of granular media Rafael L. Rangel Juan M. Gimenez Alessandro Franci hierarchical multiscale analysis discrete element method representative volume elements heat conduction This work presents a continuum-discrete hierarchical multiscale methodology based on data-drivencomputations of the microscale response to simulate heat conduction in static granular materials. The effectivethermal conductivity tensors of the continuous method at the macroscale is obtained from a database of microscale results. The microscale database is created by generating and homogenizing several Representative Volume Elements (RVEs) in order to relate the thermal conductivity of the granular material to its microstructuralproperties. In this study, these properties are the local porosities and anisotropies, which are inputs of the database to obtain the conductivity. An easy yet efficient protocol for RVE generation and homogenization is also presented. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4893 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4893/3983 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4896 2024-05-11T12:12:18Z cilamce2023:M5

Simulation of fresh concrete slump test with the Material Point Method Leonardo T. Ferreira Tiago P. S. Lobo Ricardo A. Fernandes Lucas G. O. Lopes Lorran F. Oliveira Luciana C. L. M. Vieira Adeildo S. Ramos Jr Slump test Herschel-Bulkley Numerical simulation Nonlinear behavior Material Point Method The exponential growth in computational power in recent years has increasingly made numerical simulations a go-to tool for studying the behavior of structures and materials. A pertinent application is the simulation of the fresh concrete slump test, a laboratory test used to study the consistency and mobility of the concrete mixture. However, this simulation presents a challenge, as concrete — composed of a varied mixture of materials like water, cement, sand, and gravel — exhibits viscoplastic behavior. Therefore, a robust numerical method that models this physical nonlinearity is necessary. Previous works have successfully simulated the fresh concrete slump test as a Herschel-Bulkley fluid, utilizing the lattice Boltzmann method. Meanwhile, the Generalized Interpolation Material Point (GIMP) method is gaining traction in the industry. GIMP unites the best traits of mesh-based methods with the best traits of particle-based methods, by combining a fixed background grid of finite elements (i.e., a grid that remains still throughout the simulation) with material points where the kinematic data is stored. This approach favors the simulation of large displacements and deformations. In this work, GIMP is adopted to numerically simulate the fresh concrete slump test with the Herschel-Bulkley model. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4896 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4896/3986 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4897 2024-05-11T12:12:17Z cilamce2023:M5

An Analysis of water hammer pipe flow with unsteady friction model using the SPH Method Pamplona, A. J. V. P. S. Fernandes Júnior, J. Vasco, J. R. G. Nascimento, A. A. Smoothed Particles Hydrodynamics Water Hammer Unsteady Friction Two methods used for simulating flow problems in engineering are Method of Characteristics (MOC)and Smoothed Particle Hydrodynamics (SPH). This paper compares the results obtained using these two methodsfor hydraulic transient in forced conduits. Both steady and unsteady friction losses are considered using theunsteady model proposed by Vardy et al. [1]. The study findings obtained by in-house codes are compared withthe experimental results of Martins et al. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4897 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4897/3987 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4898 2024-05-11T12:12:17Z cilamce2023:M5

Discrete element modeling for predicting 3D-printed concrete process parameters Victor Hugo M. Avancini Osvaldo D. Quintana-Ruiz Eduardo M. B. Campello 3D concrete printing discrete element methods (DEM) particles This work presents a computational model for the simulation of the rheological behavior of 3D-printedfresh concrete. Our approach is based on the discrete element method (DEM) for description of the particles’overall dynamics, combined with the Discrete Fresh Concrete (DFC) model [1] to account for particle-particleand particle-wall interactions at the level of the (contact) constitutive equation. Using the DFC model, we hopeto be able to represent the interaction among coarse aggregate particles within a fine mortar matrix. This is anon-going research that is part of a master’s dissertation, and only the theoretical framework will be presented bynow. Numerical results shall appear soon. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4898 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4898/3988 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4900 2024-07-02T12:47:22Z cilamce2023:M6

Numerical Simulation of the Stress-strain Behavior of Polymeric Fibers for Mooring Offshore Structures Daniel M. Cruz Marcelo A. Barreto Larissa B. Zangalli Felipe T. Stumpf Jakson M. Vassoler Carlos E. M. Guilherme Offshore mooring, Ultra deep-water, Constitutive model, Synthetic fibers, Strain energy function. Polyester fibers have been used in offshore mooring due to their excellent mechanical properties,resistance to marine environments, and relatively low cost. However, its mechanical behavior still needs furtherinvestigation since its working environment is subject to adverse conditions that can magnify inelastic behaviors.Thus, this work focuses on the characterization of components of this material according to different levels ofconstruction. Multifilaments and sub-ropes were numerically simulated based on the Modified Yeoh strain energymodel. The simulation parameters were adjusted using experimental data from cyclic tests, and the results werethen compared with the experimental data. The numerical simulations demonstrated good agreement, with anaverage error of approximately 1.3% for both multifilaments and sub-ropes. Furthermore, the study identifieddissimilarities in constitutive behavior between them due to the twisting and braiding involved in sub-ropeconstruction. These findings suggest the possibility of developing a formation law that can predict the constitutivebehavior of sub-ropes based on the numerical simulation results obtained for multifilaments. Such correlationcould prove advantageous in optimizing material performance and construction methods for offshore mooringsutilizing polyester fibers. However, it's important to conduct further studies to establish the precise correlationbetween both behaviors under different manufacturing conditions. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4900 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4900/5231 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4901 2024-05-11T12:12:15Z cilamce2023:M6

Towards a methodology to estimate environmental loadings from time history motions of offshore platform by using Artificial Neural Networks Bruno F. Monteiro Carl H. Albrecht Breno P. Jacob Artificial Neural Networks Environmental loadings Floating production systems (FPS) for offshore oil exploration are subject to environmental loads suchas waves, wind and current in different directions of incidence and varying intensities that result in dynamicmovements of this same system. Nowadays, FPS has several sensors, in this particular case, its position ismonitored by GPS and accelerometers. On the other hand, it is hard to monitor environmental loadings in a deepwater that depends on oceanographic buoys. Therefore, this paper presents the first steps to estimate the parametersof wave loading from a time history motions of an offshore platform by using Artificial Neural Networks (ANN).From this, it may be possible to verify oceanographic forecast models and to know the environmental conditionsat the moment of an event, such as, line break or equipment breakdown. In addition to this, we can estimate realenvironmental data for the generation of digital twins, which is a digital replica of the real system. In the casestudy, ANN training process is performed from data of a rigorous Finite Element (FE) analysis. From the results,we can observe that ANN presents a high level of accuracy in this kind of application, which allows to moveforward with research in this area. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4901 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4901/4074 https://drive.google.com/drive/folders/1hMF6QinqtwdLuFsA1eVT7Ye0HW1B9g76

oai:publicacoes.softaliza.com.br:article/4902 2024-05-11T12:12:15Z cilamce2023:M6

Finite Element Analysis of a NORSOK L005 Ball Valve for Oil & Gas Applications Felipe Frizon Diego Rizzotto Rossetto Diogenes Barbosa Teles ball valve, NORSOK L005, oil and gas industry, finite element analysis. The oil and gas sector is one of the main consumers of industrial valves, which are essential devices formanaging liquid, gas, or mixed fluids, ensuring safety and production in this industry. Designed according tointernational standards, valves undergo structural analyses with calculations to ensure reliability and safety,considering the pipeline's pressure class. In this study, a NPS 6 trunnion-mounted split-body ball valve wasanalyzed, with flanged connections between the body and the cover designed according to NORSOK L005 [5]standard. Using the finite element method and ANSYS software, three analyses were applied: linear-elastic withstress linearization, elastoplastic, and elastoplastic for localized deformations, following the guidelines of ASMEVIII, Division II code [7]. The study resulted in an optimized valve geometry concerning mass concentration inthe body-to-cover connection, meeting the strength criteria defined in the design by analysis methodology ofASME VIII, Division II [7]. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4902 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4902/3991 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4903 2024-05-11T12:12:14Z cilamce2023:M6

Sensitivity analysis of production parameters in multiphase flow simulations Philip Stape Murilo F. Rapozo Juliana S. Baioco Luis F. Mazadiego Martínez Breno P. Jacob Oil fields development, production management, multiphase flow simulations, sensitivity analysis. With the development of oil fields in ever deeper water depths, the costs involved in exploration andproduction have grown drastically. Thus, to make projects more economically attractive, it is necessary tounderstand the factors that contribute to maximize production. In hydrocarbon production management, there areseveral parameters that involve fluid flow through the production system that can significantly impact fieldproductivity. The value of these parameters may contain uncertainties that interfere in the platform's short-termdecisions, such as: well opening and closing strategies, choke valve opening, injection parameters, among others.In this context, the proposed paper aims to evaluate the well test parameters and perform a sensitivity analysis toverify which parameters have the most impact on the well productivity, through a correlation matrix. The analyzedparameters are reservoir pressure, productivity index, gas-oil ratio, water cut and gas lift injection rate. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4903 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4903/3992 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4904 2024-06-06T22:23:25Z cilamce2023:M6

Using metamaterial to control offshore wind turbine vibrations Marcela R. Machado Maciej Dutkiewicz Wind turbine dynamic analysis, Metastructure, Vibration control, Tuned mass damper. Wind energy is one of the renewable sources in fast development and implementation worldwide.Developing competitive renewable energies and energy supply networks, e.g. offshore wind turbines (OWT), isessential to guarantee a sustainable power supply in cities and megacities. In these scenarios, a reliable energysupply is crucial. These large and flexible structures are vulnerable to external vibration sources such as wind, seawaves and earthquake excitation. It is necessary to mitigate the dynamic responses of offshore wind turbines toensure the safety of these structures. The OWT selected is a National Renewable Energy Lab (NREL) monopile 5 MW baseline wind turbine. This OWT is a conventional three-bladed variable-speed, pitch-to-pitch, upwind-controlled turbine. This paper explores using metamaterial to control vibrations from offshore wind turbine tower modes. The effectiveness of the proposed control is numerically investigated. The outcomes reveal the benefit ofusing the metamaterial compared to conventional tuned damped mass passive controls. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4904 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4904/4706 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4905 2024-06-06T22:26:08Z cilamce2023:M6

Evaluation of Extreme Conditions for Transportation of Offshore Drilling Equipment Using Riser Column Aline E. S. Freitas Fabrício N. Corrêa offshore, drilling system, BOP stack, equipment transportation. Considering the increase in offshore production activities taking place in deep water depths, theoperations related to well drilling and oil production are becoming more complex and expensive and demandsdetailed analysis to assess the safety of the procedures. An example is the transportation of equipment with largedimensions such as the Blow-Out Preventer (BOP) and Lower Marine Riser Package (LMRP) pack, which is aprocedure that needs attention since it is costly and demands a lot of time due to deep water depths at which thisequipment is being installed. In addition, the pack can reach resonance zones during the installation procedure,increasing the relevance of dynamic analyses. In this context, the objective of this paper is to study the feasibilityof transporting the BOP/LMRP without the need to withdraw the equipment to the drilling rig, which, in somecases, should considerably reduce the time and cost of the operation. In addition, the work addresses the mainforces acting on the drilling riser during this procedure and the need to perform specific analyses. Typicalequipment will be studied at three different depths considering different navigation speeds and wave heights.Criteria such as maximum stress and limit angle of the lower flexjoint are evaluated. Although the wave and VortexInduced Vibration (VIV) fatigue phenomena have not been studied, the main goal is to assess whether extremeefforts are points of attention in transport operations with the BOP/LMRP set suspended. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4905 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4905/4707 https://drive.google.com/drive/folders/1hMF6QinqtwdLuFsA1eVT7Ye0HW1B9g76

oai:publicacoes.softaliza.com.br:article/4906 2024-06-06T22:35:25Z cilamce2023:M6

Nonlinear dynamic structural optimization of offshore structures using equiv- alent static models Gabriel R. Domingos Eduardo N. Lages Adeildo S. Ramos Jr Anderson T. Oshiro Mauro C. Oliveira Structural Optimization, Offshore Structures, Anchor systems, Dynamic Models, Equivalent Static Models Nonlinear dynamic analyses of offshore structures are well-known for their often expensive computa-tional cost. Optimizing such models is an even more complex task because it requires many nonlinear dynamic analyses in sequence. On the other hand, nonlinear static analyses of offshore structures have significant lowercomputational cost, and can be used to approximate the nonlinear dynamic nature of the original problem andcome up with a valid optimized solution. This work proposes the use of an equivalent static model to performstructural optimization applied to anchor systems of offshore structures. The equivalent static model is built based on the field of displacement of the original model, using a penalization factor to approximate the static displace-ments field to the dynamic one. To encompass more of the dynamic nature of the problem into the static model, not only the field of displacement is used, but also its convex hull. This strategy allows minor differences betweenthe models to be taken into consideration. This penalization factor, chosen at the start of the optimization, as wellas the use of the convex hull of the displacement fields were shown to create a fair correspondence between themodels, allowing the problem to be solved in a fraction of the original time, and resulting in valid, optimizedresults. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4906 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4906/4708 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4909 2024-05-11T12:12:12Z cilamce2023:M6

TOWARDS THE GLOBAL ANALYSIS OF SOIL AND RISER INTERACTION USING A DEGRADATION SOIL MODEL Edgar S. B. Micolo Fabrício N. Correa Breno P. Jacob Soil and riser interaction coupled analysis numerical analysis In offshore industry as water depth gets deeper, the prediction of riser loads gets more complex, due toissues such as its interaction with seabed. The touchdown point (TDP) – where the riser touches the seabed for thefirst time – is a hot spot where the interaction is intense, and good predictions of TDP response is critical to theassessment of steel catenary riser (SCR) fatigue life. Therefore, the soil model plays an important role, becausesimplified models can overestimate the SCR curvature at TDP. Different types of soil have been studied fromlinear to nonlinear springs to represent the seabed. Nonetheless, linear springs cannot represent the real soilbehavior, thus research focuses on P-y curves based in pipe-soil experimental results. Two models became widelystudied: the non-degradation and degradation models. The former has been applied in general software analysis,but the degradation model has not. The degradation model is based on plastic soil deformation under cyclic loads,and it has other features such as consideration of soil- water mixing, erosion, and soil consolidation, which candrive the riser-soil separation and trench formation. The purpose of this article is to describe the implementationof a soil-riser interaction model considering degradation effects [1] on the in-house time domain global analysissoftware SITUA-Prosim. Two case studies are presented to validate the model and the proposed algorithm. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4909 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4909/3996 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4910 2024-05-11T13:06:19Z cilamce2023:M6

Streamlining nonlinear blast analysis for efficient structural design of off- shore platforms Andre L. L. S. Lima Lucas D. F. Lino Eduardo S. S. Silveira Tiago P. S. Lobo Christian C. Oliveira Gabriel C. Freitas Dilnei Schmidt Offshore structural design, Blast analysis, Model preparation, Nonlinear analysis, The design of offshore platforms requires comprehensive blast analyses to ensure safety and structural integrity. However, creating dedicated structural models for nonlinear blast analyses can be complex and time-consuming. This paper describes the development of an innovative application that simplifies and automates steps of the model preparation process for nonlinear blast analyses, by taking advantage of existing structural modelsused for in-place operational structural analyses. Engineers can use wizards within the application to automate steps, reducing manual work and potential errors. Developed with a Java Spring Boot backend and a React fron-tend, this tool not only simplifies but also streamlines the model preparation process, ultimately enhancing the efficiency of offshore platform design. As a result, the application has demonstrated substantial efficiency gains,significantly reducing the time required for nonlinear blast analysis model preparation when compared to manualmethods for a single structure. This application represents a significant advancement in nonlinear blast analysisworkflow, boosting productivity, accuracy, and reliability in the development of offshore structures. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4910 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4910/4249 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4911 2024-05-11T14:22:13Z cilamce2023:M7

Dynamic Model Updating of Al-Al Honeycomb Sandwich Panels for Aerospace Applications Cássio B. Mainardes Sergio H. S. Carneiro Model Updating, Bayesian Optimization Algorithm, Honeycomb Sandwich Panel. In aerospace environment, it is crucial to develop reliable dynamic models to accurately predict thestructural behavior of aircraft. The established approach involves constructing numerical models using the FiniteElement Method and utilizing experimental data for model updates and improvements. This paper focuses on theconstruction and updating process of dynamic models applied to Al-Al honeycomb sandwich panels, which serveas the main structure of the Brazilian Geostationary Satellite. Two numerical models are proposed to replicate thehoneycomb plate's geometry, including a simple equivalent laminated plate, and a face plate-equivalent solid coremodel. Experimentally obtained parameters are utilized to update the numerical models using a Bayesian optimization algorithm, which finds equivalent values for physical parameters enhancing the numerical-experimental correlation of natural frequencies. Since this process is probabilistic, Monte Carlo simulations are performed to ensure convergence of the obtained values. The results demonstrate that even the lower complexityequivalent plate model can adequately represent the panel, making it suitable for preliminary analysis and savingcomputational time compared to the higher complexity model. Overall, this paper presents a comprehensiveapproach to constructing and updating dynamic models of honeycomb sandwich panels, demonstrating theireffectiveness in accurately capturing the dynamical behavior of aerospace structures. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4911 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4911/3998 https://drive.google.com/drive/folders/1hNby-mQKAd6KxrRwTOl7NpkFbsNVji99

oai:publicacoes.softaliza.com.br:article/4912 2024-05-11T14:55:24Z cilamce2023:M7

Contribution of the eccentricity of unbonded tendons to the punching shear resistance of prestressed flat slabs Elyson A. P. Liberati Heraldo Brigo Marília G. Marques Leandro M. Trautwein punching shear, flat slabs, prestressed concrete, numerical analysis. With the increasing use of prestressed flat slabs in floor construction, studies are needed to assess thehigh shear stresses generated in the slab-column connection, which is a vulnerable point to punching failure andcrucial for the design of this constructive system. Together with experimental studies, the use of computationaltools has allowed the analysis of the influence of prestressing on the ultimate resistance and thus the understandingof the puncture phenomenon through numerical simulations. In this study, experimental tests were simulatedthrough nonlinear three-dimensional analysis using the computational program ATENA. The nonlinear behavior of cracked concrete and the yielding of steel in passive and active reinforcement was considered. The load-displacement and load-strain curves were compared between the experimental and numerical results obtained, with the aim of validating the constitutive models adopted for concrete and steel. From the adequate calibration ofmodels, a parametric study was carried out with variations in the spacing and eccentricity of the tendons in theslab, thus allowing to identify the influence of these parameters on the punching shear resistance. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4912 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4912/3999 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4914 2024-05-11T14:53:13Z cilamce2023:M7

Parametric structural computational study of flat slabs under punching shear stress Orlando M. L. Almeida reinforced concrete, flat slabs, parametric structural design, punching shear. The system composed of flat slabs and columns offers advantages compared to the traditional systemof slab-beam system such as increased internal space and reduced formwork usage. This structural system hasbeen the object of study over the last few decades due to the complexity of its structural behavior, particularly thepunching shear phenomenon. It is a brittle failure mechanism that occurs in the slab-column connection, inducedby high shear forces. Thereby, the study of punching shear is crucial due to structural sudden failure characteristic.Over the last decades, the relevance of parameters that influence the performance of flat slabs has beeninvestigated, such as slab thickness, longitudinal reinforcement ratio and column size. The use of parametriccomputational analyses allows the use of optimization procedures to improve the efficiency of the system and further investigate the relevant parameters affecting punching shear. Therefore, this research employs three-dimensional parametric structural computational models to analyze the impact of slab thickness and column size in the phenomenon of punching shear. The models are based on a centrally located column in a slab panelmeasuring 250 x 250 mm. The space of solutions for the parameters under analysis are examined to find the optimalrange for their use. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4914 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4914/4250 https://drive.google.com/drive/folders/1hNby-mQKAd6KxrRwTOl7NpkFbsNVji99

oai:publicacoes.softaliza.com.br:article/4915 2024-05-11T14:51:02Z cilamce2023:M7

Remote inventory and inspection of the truss bridge elements and connections using STS and UAV P. Olaszek E. Maciejewski A. Rakoczy R. Cabral R. Santos D. Ribeiro visual inspections, Scanning Total Station, Unmanned Aerial Vehicle. The traditional visual inspections, along with the remote Structural Health Monitoring (SHM) methodsare very valuable tools to keep the existing bridges safely in service. In the case of old structures with incompletedocumentation, verification of dimensions is also an essential aspect. Traditional on-foot or on-boat visualinspections have many limiting factors. For large or tall structures, there is little to no possibility of visuallyinspecting the entire structure without using lifts or other heavy machinery. This paper presents an attempt to usea Scanning Total Station (STS) for the inspection and inventory of the dimensions of a truss railway bridge overthe largest river in Poland. Measurements were conducted using two methods: the direct method with the use of atotal station and the use of advanced geometric analyses of the collected point cloud. The field tests on the bridgewere preceded by tests in the laboratory, where the accuracy of the method was assessed. During the tests on thebridge, a deviation from the actual geometry of the selected truss connection in relation to the old documentationwas detected. The credibility and scale of this deviation throughout the bridge span were confirmed by UnmannedAerial Vehicle (UAV) inspections. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4915 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4915/4001 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4917 2024-05-11T14:48:55Z cilamce2023:M8

A study on temperature rise in heterogeneous cement materials using the FE2 method Luciene de Souza Kichel Rodrigo Rossi CBM, temperature rise, hydration kinetics, Direct FE2. The hydration reaction of ordinary Portland cement (OPC) is a complex process that initiates as soon asthe OPC meets water. During this process, hydration products are formed, changing the thermal and mechanicalproperties and releasing heat. Massive structures of cement-based materials (CBMs) such as damns, bridges orfoundations of large buildings, tend to present a substantial increase of temperature due the great amount of heatgenerated by the hydration reaction which together with the mechanisms of heat transfer trough the boundariescan cause significative high temperature gradients and nonhomogeneous dilation/shrinkage, leading to cracking during the early ages. To prevent these damages, the hydration process can be numerical predicted using multi-scale models, once that the thermochemical response and increasing of temperature of the macroscale depends on the microstructural changes due the hydration reaction. In this paper, the recent computational homogenizationapproach direct FE2 method (dFE2) is applied to predict the adiabatic and semi-adiabatic temperature rising inmortars, assuming a simple chemical kinetics law to describe the hydration of the OPC and several sand fractions.The dFE2 method is a monolithic method in which the passage information macro to micro and micro to macrois not required as in the usual FE2. Instead, by using the concepts of multipoint constrains the macro and micro discretization are linked allowing the imposition of the boundary conditions (linear, periodic, etc.) to the represen-tative volume element (RVE). The implementation was made on ABAQUS finite element software by developing particular user-subroutines used to determine state of cure of cement-based materials. A example of macrostructureunder semi-adiabatic conditions, exchanging heat with its surroundings by convection, is presented. The resultsshow the adequacy of the proposed approach. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4917 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4917/4002 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4918 2024-05-11T14:46:05Z cilamce2023:M8

Numerical and Analytical Study of Reinforced Concrete Beams with Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) Ingrid R. Irreño Palomo Camila de Q. Moreira reinforced concrete, retrofit, UHPFRC, finite element, beam. Ultra-High Fiber Reinforced Concrete (UHPFRC) has recently been used to retrofit structures,presenting great mechanical behavior under flexural loads. This work used the data of a developed numerical studyto develop a numerical and analytical methodology to obtain the ultimate bending moment (Mu) of a reinforcedconcrete (RC) beam retrofitted with UHPFRC subjected to monotonic load. The numerical model was developedin the commercial program ATENA 3D, using the Finite Elements Method (FEM). The numerical analysisconsidered the nonlinear material behavior to obtain closer values to the experimental test. The analyticalmethodology was based on the previous equations developed by other authors, with the modification of the tensilediagram of the UHPFRC. The results obtained from both methods presented good accuracy in the ultimate bendingmoment compared to the experimental one. Regarding the case study, the analytical and numerical models showeddifferences of 7.1% and 2.9%, respectively, and similarity in the load-displacement curve of the retrofit beam withUHPFRC. This work demonstrated the ability of the ATENA program to simulate the structural behavior of RCbeams retrofitted with UHPFRC. Finally, it is possible to conclude that both methodologies could determine theultimate bending moment for beams strengthened with UHPFRC. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4918 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4918/4003 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4919 2024-05-11T14:41:57Z cilamce2023:M8

Bond Behavior between helically wrapped FRP rebars and concrete Cristiane Caroline Campos Lopes Hermes Carvalho FRP rebars, FEM, Concrete, Abaqus, Bond behavior. The bond behavior of FRP rebar embedded in concrete structures is influenced by many factors, suchas fiber type, fiber content, the diameter of the rebar, and concrete strength. The bond behavior of FRP rebars isone of the major concerns in FRP applications as reinforcement in concrete structures. There are many studies inthis area because there is no standardization for the surface treatment of these rebars. Besides the experimentalanalysis of the behavior of the rebars through pullout tests, numerical analyses are extremely necessary so thatmore of the parameters that influence bond behavior can be varied and their influence analyzed. The aim of thispaper is to analyze the bond behavior of new FRP rebars developed. The numerical analysis will be carried out onthe finite element analyses program ABAQUS. The material of both the concrete block and the FRP rebar wasimplemented as linear elastic until failure. For the interaction between the concrete block and the FRP rebars wasused the cohesive surface solution and the results obtained by the simulation were compared with experimentalresults obtained by the authors. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4919 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4919/4004 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4920 2024-04-26T13:10:46Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4921 2024-05-11T14:42:25Z cilamce:ART

oai:publicacoes.softaliza.com.br:article/4923 2024-04-26T13:11:30Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4924 2024-05-11T14:39:03Z cilamce2023:M8

Analysis of transition variables in a continuous-discontinuous model to describe the crack process in concrete structures Lívia Ramos Santos Pereira Samuel Silva Penna Continuous-discontinuous model, Fracture representation, Transition variable, Damage, Phase-field The complete characterization of fracture in quasi-brittle materials such as concrete remains a chal-lenge in computational modeling because of the complexity of this phenomenon and the material constitution. Continuous-discontinuous approaches have been developed to fill this gap, embracing the continuous degradationprocess related to smeared cracks and the discontinuity representation when discrete cracks emerge. Besides theefforts, there is no consensus about the transition procedure between continuous and discontinuous. The literatureindicates that many parameters can be monitored to annunciate the transition, such as energy, historical variables,crack length, crack opening, etc. But the most frequently used variable is damage. More recently, the phase-fieldmodels have shown an ability to connect Continuum Damage Mechanics and Fracture Mechanics, acting as a crack enunciator and tracker. Considering the context, an analysis of the transition variable and the value it assumes dur-ing the evolution of smeared degradation to an explicit crack is proposed. A combined strategy that associates nonlocal damage models with a mesh redefinition model based on nodal duplication is adopted. Two parameters are compared in the transition function: the damage variable and the phase-field variable. Some numerical simula-tions were performed, admitting different limit values. The results are analyzed to establish the optimal value that characterizes crack nucleation and which parameter works better as a transition variable. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4924 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4924/4008 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4925 2024-05-11T14:34:22Z cilamce2023:M8

Numerical analysis of two pile caps reinforced concrete with partially embedded and shear key interface Morais Neto, J.A.C Rodrigo Barros Daniel Maciel Pile caps. Socked foundation. Abaqus. Reinforced concrete. On Precast concrete structures the column foundation connections can occur through the socketfoundation, which can be embedded, partially embedded or external, with socket walls over the pile caps. Thispaper presents an experimental study about two pile caps reinforced concrete with partially embedded socketsubmitted to central load, using 1:2 scaled models. In the analyzed models, the shear key interface between thesocket walls and column was considered. Additionally, a numerical analysis in the Abaqus software wasperformed, considering the physical non-linearity of the materials. The results are compared to a reference modelthat presents monolithic connections between the column and pile caps. It is observed that the ultimate load ofpile caps with partially embedded socket present less magnitude than the reference model, and that the presenceof additional reinforcement does not significantly change the behavior of pile caps. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4925 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4925/4009 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4927 2024-04-26T13:32:38Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4929 2024-05-11T14:32:18Z cilamce2023:M8

Advancing Cement Paste Shrinkage Modeling: Investigating The Normalized Ultrasonic Pulse Transit Time Evolution And Its Impact On Stress Analysis In Oil Wells Carlos P. C. Carvalho Emilio C. C. M. Silva Jose C. F. Telles Eduardo M. R. Fairbairn Jose M. S. Rocha Magno T. Mota Ingrid E. Silva Romildo D. Toledo-Filho Ana B. C. G. Silva cement shrinkage, finite element method, transit time, degree of hydration, remaining capacity. This study presents a new modeling approach for predicting cement paste shrinkage evolution, with aspecific focus on its relationship with transit time, and consequently with the hydration of the cement paste. Cementplays a crucial role in well integrity, and therefore, cement shrinkage is a critical factor in stress analysis withinoil wells. By developing a proper modeling technique, it becomes possible to numerically calculate the residualcapacity of the cement sheath, accounting for thermal and pressure loads throughout the well's lifespan. In thisresearch, a new modeling approach is proposed for the evolution of shrinkage based on cement slurry cured undertemperature 60 °C and pressure of 1.0 kpsi. The development of the cement was analyzed using ultrasonic pulsevelocity and volumetric shrinkage tests over a period of 90 hours. The newly developed shrinkage evolution modelis compared to the traditional linear adjustment method, considering the degree of hydration. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4929 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4929/4011 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4933 2024-05-11T14:29:06Z cilamce2023:M8

A discrete and explicit representation of tendons based on coupling finite elements for numerical analysis of prestressed concrete structures Osvaldo L. Manzoli Lu ́ıs A. G. Bitencourt Jr. Paulo V. C. N. da Gama Prestressed concrete, Coupling finite element, Tendon-concrete interaction, Unbonded post-tensioned, Bonded post-tensioned. This work presents a new strategy for representing tendons with a discrete and explicit approach tonumerical analysis of prestressed concrete structures via finite element method. The prestressing tendons arerepresented by one-dimensional truss finite elements with the behavior described through a bilinear elastoplasticmodel with a prescription for initial deformations. The concrete and prestressing tendons are inititally discretized infinite elements in a totally independent way. Then, coupling finite elements are inserted to describe the interactionbetween tendons and concrete. A damage constitutive model is used for modeling unbonded postensioned cases.The proposed approach is validated through the numerical simulation of benchmarks available in the literature anda good agreement between them can be observed. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4933 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4933/4012 Copyright (c) 2024 XLIV Ibero-Latin American Congress on Computational Methods in Engineering

oai:publicacoes.softaliza.com.br:article/4935 2024-05-11T14:24:52Z cilamce:ART

oai:publicacoes.softaliza.com.br:article/4936 2024-05-11T14:24:03Z cilamce:ART

oai:publicacoes.softaliza.com.br:article/4938 2024-05-11T12:12:00Z cilamce2023:M9

1D Nonlinear Acoustic Wave Equation In Heterogeneous Fluid Renan A. Peres Antônio M. F. Frasson Carlos F. Loeffler Fábio P. Piccoli Julio T. A. Chacaltana Non-linear Acoustic Wave equation Non-homogeneous Finite Element Method Ricker wavelet In this work, the one-dimensional nonlinear equation of acoustic wave propagation in non-homogeneous fluid was developed using the physical laws of fluid mechanics and thermodynamics for a compressible fluid, including a source term for pressure wave generation. The solution of the 1D Acoustic Wave equation is performed in the time domain using the Petrov-Galerkin Finite Element Method (FEM), and the linear and parabolic approximation basis functions. In wave generation, two different types of pressure source term were implemented, the Ricker type (Chacaltana [1]; Picolli [2]) and the sinusoidal type. The boundary conditions of Neumann (natural reflection) and Reynolds [3] (Absorbing Boundary Condition - ABC) were also implemented and tested. To test the model, a Fortran code was written and a graphical interface in Octave was used to visualize and analyze the numerical results. Simulations were performed in a discrete domain of points representing the one-dimensional mesh. The non-uniform distribution of discrete points was obtained by the GMSH mesh generator. Numerical results were compared with those found in the literature. And, there was a good agreement between them. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4938 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4938/4016 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4940 2024-05-11T12:11:59Z cilamce2023:M9

Analysis of the conditioning of the inertia matrix in acoustic models of the Boundary Element Method with Direct Interpolation G. A. R. Santos C. F. Loeffler Boundary element method Acoustic problems Direct Interpolation technique After to be solved problems given by Helmholtz, Diffusion-Advection, and Poisson equations, this work presents the results of the Direct Interpolation Method concerning acoustic wave cases to homogeneous media. The main objective is to establish a link between the stability of the discrete model with the conditioning level of the dynamic matrix, which is generated through a sequential of radial basis functions. Several conditioning norms were verified and applied to several linear boundary element meshes. A classical problem of wave propagation in scalar fields was chosen for the numerical analysis. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4940 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4940/4018 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4941 2024-05-11T12:11:59Z cilamce2023:M10

Application of a Relevance Matrix to Thermal Unit Commitment in the Presence of Renewable Energy Sources De Oliveira M. Layon Junior C. da S. Ivo Abritta Ramon De Oliveira Edimar José Castro B. Cristina Marcia unit commitment thermoelectric power optimization renewable energy sources The short-term unit commitment problem is considered hard to optimally solve given the combinatorialexplosion of the operation decisions regarding the generating units involved in the daily operation planning. Theproblem’s complexity further increases when introducing renewable energy sources, e.g., solar and wind, to theplanning. This paper applies a recently proposed search space reduction method to thermal unit commitmentsystems penetrated by solar and wind power generation.   XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4941 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4941/4019 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4942 2024-05-11T12:11:58Z cilamce2023:M10

Utilization of Artificial Intelligence techniques in the development of City Information Models (CIM) Iasmin de Sousa Jaime Raquel Naves Blumenschein City Information Modeling Artificial Intelligence Image segmentation Machine Learning This paper presents an investigation into the application of computational intelligence techniques, optimization, and data modeling in the development of CIM models. CIM is a concept that seeks to integrate information and data related to a city into a three-dimensional digital model, allowing for a detailed and dynamic representation of the urban environment. However, dealing with large volumes of data and optimizing the efficiency of urban operations is a complex challenge. To address this challenge, this article proposes the use of artificial intelligence techniques, such as machine learning algorithms and artificial neural networks. These techniques are capable of handling large-scale problems, finding optimal or approximate solutions, and dealing with uncertain or imprecise data. The article explores the different applications of computational intelligence techniques in the optimization and data modeling of CIM through the development of a systematic literature review (SLR) and the application of the Design Science Research (DSR) method to discuss the relationship between these technologies and CIM. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4942 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4942/4020 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4943 2024-05-11T12:11:57Z cilamce2023:M10

Map Fusion for Precise Yet Efficient Collaborative SLAM Luigi Maciel Ribeiro Nadia Nedjahr Paulo Victor R. Carvalho C-SLAM Map fusion Fourier Transform Pearson Correlation Multi-robots Collaborative Simultaneous Localization and Mapping (C-SLAM) is an active research area in robotics that aims to enable the collaboration of multiple robots in constructing a shared map and simultaneously estimating their positions. However, Map fusion poses a significant challenge, especially when involving a large group of robots. It aims at obtaining an accurate global representation of the environment. This paper proposes an novel approach using the Fourier Transform, the Pearson correlation coefficient and Particle Swam Optimization to address the map fusion problem. Efficiently merging maps into a global representation requires careful consideration of spatial relationships and alignment of these maps. The Fourier Transform analyzes spectral features in each robot’s measurements, extracting insights about spatial distribution. The Pearson correlation coefficient evaluatesspectral similarity between different map sections, facilitating region pairing for successful fusion. The search foroptimal fusion parameters is performed using the Particle Swarm Optimization Algorithm. These distinct regionsguide the fusion process, optimizing global map creation. Instead of a complete map fusion, selective fusion of sections increases the likelihood of success. Experiments involving five robots in a simulated environment validate the proposed approach, demonstrating the capability of optimized map fusion to provide a more accurate and comprehensive representation of the environment. This enhancement should contribute to refine further theC-SLAM. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4943 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4943/4021 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4944 2024-05-11T12:11:57Z cilamce2023:M10

Optimization of Load Frequency Control parameters In hydro-wind sys- tems using Manta Ray Foraging Optimization Gabriel Schreider da Silva Lucas Santiago Nepomuceno Edimar Jose de Oliveira Arthur Neves de Paula Leonardo Willer de Oliveira Ivo Chaves da Silva Junior Manta Ray Foraging Optimization nonlinear programming Load Frequency Control Wind generation Hydro generation This work proposes a novel hybrid optimization approach combining nonlinear programming and the Manta Ray Foraging Optimization (MRFO) metaheuristic to optimize the controller parameters of the hydro-wind interconnected power system to improve the Load Frequency Control (LFC). The optimization process addresses challenges posed by integrating wind power into power grids due to its limited inertia, which hampers natural inertial response. The research focuses on incorporating wind generation into Load Frequency Control (LFC) utilizing the Virtual Synchronous Generator (VSG) technique and operational adjustments. In this way, this work contributes to improving LFC efficiency in mixed power generation setups by introducing a hybrid method that surpasses the limitations of traditional controllers, enhancing the equilibrium between power generation and demand. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4944 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4944/4029 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4945 2024-05-11T12:11:56Z cilamce2023:M10

Parallel Implementation of the Particle Swarm Optimization Algorithm on a Multiprocessor Embedded System with Network-on-Chip Alberto de Carvalho Passos Luiza de Macedo Mourelle Nadia Nedjah Particle swarm optimization Parallel algorithms Multiprocessor embedded system Network-on-chip In recent years, with technological advancements, the need to solve complex problems has emerged in various areas of knowledge, such as data mining, combinatorial optimization, power systems, signal processing, pattern recognition, machine learning, and robotics. The key characteristic of these problems is their computational intensity, particularly in terms of execution time. In order to accelerate the problem-solving process, bio-inspiredalgorithms have been developed, which aim to simulate the behavior found in biological systems, such as living organisms and ecosystems, to efficiently solve complex problems. Examples of these algorithms include ParticleSwarm Optimization, Ant Colony Optimization, Artificial Bee Colony, and Cuckoo Search. This work aims to obtain a parallel implementation of the Particle Swarm Optimization algorithm using a Multiprocessor Embedded System with Network-on-Chip. The parallelization strategies we employ are based on the Parallel Particle Swarm Optimization and Cooperative Parallel Particle Swarm Optimization algorithms, using master-slave, ring, and 2Dgrid topologies. Based on the execution time obtained by each parallel algorithm and each employed topologyduring the simulations, it will be possible to identify which parallelization strategy provides the best performance,as well as the number of processors required. Currently, the results, when compared to the serial version of theParticle Swarm Optimization algorithm, are promising. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4945 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4945/4023 https://drive.google.com/drive/folders/1fxqMrIhDIxELEJcWPbxq7XMMST0VsISx

oai:publicacoes.softaliza.com.br:article/4946 2024-05-11T12:11:55Z cilamce2023:M10

Collective transport by caging in swarm robotics Karen S. Cardoso Nadia Nedjah Luiza M. Mourelle Swarm robotics Collective Transport Caging Collective transport, in swarm robotics, is based on the transportation of objects by swarms of robots characterized by having significantly smaller dimensions compared to the object to be transported. The set of robots of the swarm generally have the same architecture. Individually, the robots are able to perform simple functions, such as sensing, locomotion, and basic communication. However, cooperatively, they can perform complex task. Collective transport has diverse applications that encompass the transportation of both large-scale objects and nanoscale objects. Consequently, numerous studies have been driven by this topic, highlighting three  transport strategies: pushing, grasping, and caging. In this work, the caging strategy is adopted. It can be defined as the complete enclosure of the object. Allowing it a certain degree of freedom but preventing it from escaping the formation of robots around it. The main advantage of this strategy is the coordinated and cohesive progression of the transport since the forces applied to the object by the swarm complement each other and prevent significant deviations in its trajectory towards the planned destination. This work proposes a method to approach collective transport by caging, which operates in three stages: the search for the object by the swarm, the recruitment of swarm robots, aiming to position the robots around the object and enclose it, and the transport stage. The implementation of the proposed strategy is carried out in the CoppeliaSim platform, wherein the swarm is composed of Khepera III-type robots. This robot is chosen due to the arrangement of its sensors along  its perimeter, which allows for a wide view of the environment. The arena, which is the scenario where the simulations are conducted is discretized into different configurations. This space discretization has a significant impact on the performance of the search and transport stages. The performance evaluation of the search and recruitment stages are based on the execution time, while for the transport stage, in addition to the execution time, the normalized error of the object’s trajectory is evaluated for different arena discretization configurations and path lengths. The proposed method proves to be effective, as the caging is maintained throughout the entire path, thus ensuring the uniform transport of the object. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4946 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4946/4024 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4947 2024-05-11T12:11:55Z cilamce2023:M1

TMD's Optimization for Dynamic Analysis of Walkways Excited by Pseudorandom Pedestrian’s Load Victor C. Oliveira Reyolando M. L. R. F. Brasil Walkways TMD Optimization Dynamic Load Pseudorandom Pedestrian Load In this work, optimization of vibration absorbers (TMD) will be presented for dynamic analysis of walkways in aerospace structures excited by pedestrians. The dynamic loading used to excite the walkway will be a pseudorandom model. Using this type of loading, it is possible to cover a band of frequencies and amplitudes of possible excitation to the structure, similar to a PSD. The deterministic dynamic loading used as a basis is the Schulze loading. First, a simply supported beam representing a walkway will be modeled via a commercial FEM software to obtain modal mass, modal stiffness and frequency. Next, a two-degree-of-freedom model of the critical vibration mode of the structure close to the excitation frequency is presented, with a vertical TMD and a horizontal TMD, the latter modeled as a pendulum. Using MATLAB tools, the TMD mass ratio is optimized using asobjective function the minimization of the difference between the maximum acceleration of the system and limitaccelerations recommended by standards of human comfort. These optimal parameters will be carried back to theFEM model for comparisons. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4947 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4947/4030

oai:publicacoes.softaliza.com.br:article/4948 2024-05-11T12:11:54Z cilamce2023:M1

Nonlinear dynamic analysis of guyed mast under random aerodynamic loading Marcelo G. Magalhães Reyolando M.L.R.F. Brasil guyed mast nonlinear dynamics random vibrations synthetic wind In this research, a guyed mast with non-linear behavior under random aerodynamic loading is modeled. It is a slender lattice metal structure, articulated at the base, stabilized by cables. An equivalent mass of the system concentrated at its upper end is admitted, whose displacements are the generalized coordinates of the system.  The model admits large displacements, leading to the need to consider geometric nonlinearity, that is, dynamic equilibrium is always imposed on the displaced position. The non-linear equations of motion are derived via directdynamic equilibrium. The numerical algorithm for simulating the response is based on step-by-step time integration using Runge-Kutta’s Method. The random aerodynamic loading is simulated by a Monte Carlo-typeprocedure with superposition of harmonic series whose amplitudes are obtained from Power Spectrum Density Functions with randomly chosen phases. For application to the model under study, an equivalent point load is applied to the mass at the top of the mast. This procedure is inspired by the well-known Synthetic Wind Method. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4948 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4948/4031

oai:publicacoes.softaliza.com.br:article/4949 2024-05-11T12:11:54Z cilamce2023:M1

Satellite ACS Design during Orbit Injection using the SDRE Method Luiz C. Gadelha de Souza satellite control nonlinear sdre method The performance of the Satellite Attitude Control System (ACS) during the orbit injection phase is of fundamental importance for the success of the mission. In this phase the satellite leaves the launcher with high angular velocity and then the ACS needs to manoeuvre the satellite to its normal mode of operation, which is characterized by an attitude of small angles. One way to achieve this transition between these two phases is using gas jets followed by reaction wheels. In this paper one investigates and develops by simulation the ACS algorithm to minimize space mission costs by reducing the number of errors transmitted to laboratory prototypes project. The high angular velocities of the satellite in the injection phase makes its dynamics highly nonlinear introducing some level of perturbation into the system. As a result, application of linear control technique cannot be able to design the ACS with adequate performance to reach the required level of appointment. To mitigate this problem, one will use the State-Dependent Riccati Equation (SDRE) method which can deal with nonlinear system. The SDRE controller design algorithm is based on gas jets and reaction wheel torques to perform large angle manoeuvre to  reduce the high angular velocities to attitude with small angles. The criterion for the transition between the two operating modes is based on the decrease of the system energy. This investigation serves to validate the numerical simulator model and to verify the functionality of the control algorithm designed by the SDRE method. It is intended to use in the next phase of this research the Federal University of ABC (UFABC) 3D simulator which supplies the conditions for implementing and testing the SDRE algorithm in terms of hardware and software. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4949 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4949/4033

oai:publicacoes.softaliza.com.br:article/4950 2024-05-11T12:11:53Z cilamce2023:M1

Study of the effect of pressurization on the vibration frequencies of fuselages Kaique M. M. Magalhães Reyolando M. L. R. F. Brasil Alexandre M. Wahrhaftig geometric nonlinearity aircraft fuselage vibration frequency finite element method In this research, an aerospace vehicle fuselage was modeled as a long-pressurized cylinder. Theinvestigation assessed the presence of high tensile stresses in the structure and their correlation with the values ofthe undamped free vibration frequencies of the system, which vary according to its geometric stiffness. Themodeling was conducted utilizing the Finite Element Method, employing thin shell elements accounting forgeometric nonlinearity, as offered in commercial and academic software. Generally, such programs can addressthe eigenvalue problem associated with this model, using a stiffness matrix considering application of the load,i.e., pressurization. This can originate from the conditioning of the internal atmosphere of commercial aircraft orthe presence of large loads of fuel and oxidant in space vehicles (rockets). Another aspect to consider in thisanalysis is the fact that these vehicles do not have supports, leading to the existence of so-called rigid body modes,with zero vibration frequencies. Ultimately, a maximum variation of 45.29% in the natural frequency value of theinvestigated structure was observed. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4950 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4950/4034

oai:publicacoes.softaliza.com.br:article/4951 2024-04-26T17:44:24Z abmec2023:ART

oai:publicacoes.softaliza.com.br:article/4952 2024-05-11T12:11:53Z cilamce2023:M1

Analysis of a Hydrogen Flying Airplane De Aguiar, João B Tacksian, Isadora F. De Aguiar, José M. Hydrogen plane balance of plant redesign analysis Present aircrafts make use of fossil fuels in combustion processes that create large amounts of emissions.Pollution and climate changes are perceived as related to this type of emissions. These worries have led to worldwide efforts towards reduction in the use of combustion engines. Clean airplanes with zero direct emissions  require technological developments some yet in exploratory phase. Hydrogen propelled airplanes promise large  reductions in CO2 emissions. Design, testing and evaluation of power type modified airplanes is quite challenging,  as a whole new system of components is required to work with the fuel cell. To this endeavor a method is presented here, with parameters from a conceptual plane chosen as reference airplane, so as to avoid unnecessary and costly changes. Once verified the main premises, structural response of the hydrogen powered  airplane is developed with due consideration of powertrain components. For the plane, the same mission requirements are set. Balance of the plant is undertaken, before specifications are done. A first order structural analysis of the plane, for cruise conditions, shows redundancy enough to accept the modifications. Discussion and comparisons are presented. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4952 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4952/4063

oai:publicacoes.softaliza.com.br:article/4953 2024-05-11T12:11:52Z cilamce2023:M2

Generalized direct strength design approach: steel cold-formed columns under buckling mode interaction Gustavo Yoshio Matsubara Eduardo de Miranda Batista Cold-formed steel member Local-Distortional buckling interaction Local-Distortional-Global buckling interaction Direct Strength Method Finite Element Method Thin-walled steel cold-formed members exhibit local (L), distortional (D), and global (G) buckling modes. These modes can interact in various ways, depending on the relationship between the corresponding buckling loads (PcrL, PcrD, and PcrG). The direct strength method (DSM) provides equations for designing columns experiencing global, local, distortional, and local-global buckling interaction (LG). This study focuses on the most general buckling mode interaction (LDG), building upon a recent approach by the authors that covers local-distortional buckling (LD). To develop the design equations, extensive numerical (FEM) and experimental databases were utilized, covering the relevant ranges of slenderness factors (λL, λD, and λG) associated with L, D, and G buckling modes, respectively. The proposed approach combines the existing DSM equations from the Brazilian code NBR 14762:2010 and the design equations for LD buckling interaction, recently proposed by the authors. After identifying the main variables and calibrating the design equations using FEM and literature-based experimental results, the contribution of the global mode is incorporated. The resulting set of design equations takes into account all the possible buckling modes, L, D and G, and the buckling interactions (LG, LD, and LDG)for axial compression of steel cold-formed members. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4953 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4953/4041

oai:publicacoes.softaliza.com.br:article/4954 2024-05-11T12:11:52Z cilamce2023:M2

Vibration analysis and human comfort assessment of composite floors subjected to dynamic loads induced by groups of people Elisângela Arêas Richter dos Santos Felipe Almeida de Sousa José Guilherme Santos da Silva steel-concrete composite floors dynamic structural analysis human comfort assessment This research works aims to assess the human comfort and study the structural behaviour of steel-concrete composite floors subjected to dynamic loadings induced by rhythmic human activities. In this paper, the analysed structural system corresponds to a steel-concrete composite floor with dimensions of 40m x 40m and total area of 1600m2. The structure represents a typical interior floor of a commercial building commonly used for aerobics. The dynamic loadings were obtained through the use of traditional “only force” mathematical models, and also based on the consideration of biodynamic systems, in order to incorporate the human-structure interaction dynamic effect to assess the floor dynamic response. This way, the finite element model of the floor was developed based on the use of modelling techniques, adopting the mesh refinement present in the Finite Element Method (FEM) and implemented in the ANSYS software. The floor dynamic response, analysed based on the displacements and accelerations values, was determined through the investigation of several dynamic load models considering groups of people practicing rhythmic activities on the concrete slabs. Finally, it was concluded that the displacements and accelerations values have surpassed the design criteria recommended limits indicating that the floor human comfort was violated, inducing excessive vibrations and human discomfort. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4954 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4954/4042

oai:publicacoes.softaliza.com.br:article/4955 2024-05-11T12:11:51Z cilamce2023:M2

Influence of the geometric nonlinearity and the aerodynamic damping on the dynamic response of tall buildings Jean Carlos Mota Silva Juliana Mattos Farias José Guilherme Santos da Silva aerodynamic damping tall buildings geometric nonlinearity buildings dynamic analysis In recent decades, the increasing of slenderness in buildings structural design has been relevant leading to the reduction of the natural frequencies values and the damping levels, resulting in excessive vibrations and human discomfort, in some situations. Having in mind the current day-to-day project practice aiming to determine the dynamic structural response of tall buildings, two aspects are generally disregarded, associated to the effect of the geometric nonlinearity and the aerodynamic damping. Therefore, this research work aims to assess the dynamic structural behaviour of a steel-concrete composite building with 48 floors and 172.8 m height, when subjected to wind nondeterministic actions, including in the dynamic analysis the effects of the geometric nonlinearity and the aerodynamic damping. The building numerical model was developed to obtain a realistic representation of the analysed structural system, based on the Finite Element Method (FEM), through the use of the ANSYS software. The conclusions of this study, obtained based on the displacements and accelerations values, pointed out to the fact that the effect of the geometric nonlinearity led to relevant differences on the dynamic structural response of the investigated building. On the other hand, the contribution of the aerodynamic damping was not significant. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4955 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4955/4043

oai:publicacoes.softaliza.com.br:article/4956 2024-05-11T12:11:50Z cilamce2023:M2

Dynamic structural analysis of transmission lines steel towers subjected to nondeterministic wind loadings Mariana Souza Rechtman José Guilherme Santos da Silva latticed steel towers power transmission lines nonlinear dynamic analysis In the current design practise of steel latticed towers used to support electrical transmission lines, the structure’s dynamic behaviour is not considered. However, the main loading to be taken into account in the structural analysis of electrical transmission lines steel towers is produced by the wind loads, which acts dynamically over the structural system composed by towers and cables. In addition, it’s not uncommon for slender towers to present disadvantageous dynamic properties, making them vulnerable to the wind action. Considering that many accidents associated to this kind of structure occur even for wind velocities below that specified in project, it’s possible that most of these accidents have been produced by dynamic actions. This research work proposes an analysis methodology that can accurately simulate the coupled behaviour between the transmission line cables and the suspension structures, when subjected to wind nondeterministic actions, including in the dynamic analysis the effects of the geometric nonlinearity and the aerodynamic damping. The results obtained in this work indicated that the dynamic response can be relevant to the system structural behaviour, and in this scenario the use of a static analysis can lead to a non-trustable design of the towers. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4956 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4956/4044

oai:publicacoes.softaliza.com.br:article/4957 2024-05-11T12:11:50Z cilamce2023:M1

Dynamic analysis of transversal response due to moving mass in a continuous beam Baddyo K. S. P. Silva Reyolando M. L. R. F. Brasil Moving Loads Structural Dynamics Newmark’s Method This paper presents a computational analysis of the dynamic responses of a continuous beam subjectedto a moving mass and corresponding load that travels along its entire length. It aims to understand the behavior of the structure and to determine its transversal response. Here, a discretized dynamic finite element algorithm  was developed, using numerical integration by Newmark’s Method for the solution of ordinary differential equations and obtain the transversal displacements of the structure in the time domain, in order to evaluate its behavior due to moving masses and loads. The analysis is made in different velocities, damping ratios, with and without the contribution of the moving mass in the inertia of the system and comparing the effects of these parameters in the responses. The main objective is to apply the results obtained with the method to obtain displacements due to moving loads in structures such as bridges and viaducts, among other applications, and to obtain the critical velocities, where the greatest deflections of the structure are found. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4957 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4957/4061

oai:publicacoes.softaliza.com.br:article/4959 2024-05-11T12:11:49Z cilamce2023:M11

Architecture-Structure Conception in the Design of the CCBB Building in Brasilia Leonardo da Silveira Pirillo INOJOSA Márcio Augusto Roma BUZAR José Humberto Matias DE PAULA Lenildo Santos da SILVA Marcos Ritter DE GREGÓRIO Marco Aurélio de Souza BESSA Architecture Structure Niemeyer Structural System CCBB The Presidente Tancredo Neves building, which has housed the Banco do Brasil Cultural Center in Brasilia since 2000, is one of the iconic works by architect Oscar Niemeyer, designed in 1992. In the architecture of the building stand out the facades composed of long longitudinal walls in reinforced concrete with large openings that allow ventilation and natural lighting of the upper floors. These structures, with minimal thickness compared to their grandiose dimensions, have the appearance of vierendeel beams, although the structural system does not function as such. This work presents a structural design analysis of the building, seeking to show the designer’s elements of creativity to balance the structure, maintaining the formal characteristics provided by the architecture. A numerical analysis of the structural solution is made with the available computational tools, describing the adopted structural system. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4959 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4959/4046 Copyright (c) 2024 Associação Brasileira de Métodos Computacionais em Engenharia

oai:publicacoes.softaliza.com.br:article/4960 2024-05-11T12:11:48Z cilamce2023:M11

Numerical Safety and Performance Analysis of a Multipurpose Building’s Structure – Case Study Leonardo da Silveira Pirillo INOJOSA structural model Structure Structural System Pathology of buildings Elastic Instability. The present work shows the case study of a multi-use building located in Brasília-DF. The analyzedbuilding has a structural model formed by elements of a spatial portico and four-knot plate, with dimensions of25.75 by 25.75 m and a height of 11.65 m. It is supported on the foundations by rotating pillars at the base. It hasa ceiling height of 3.25 m on the ground floor and 2.80 m on the other floors. The closures are in bored brickmasonry. The article presents numerical analyses through the three-dimensional model of the building, using theSAP2000 structural software. These analyses were executed to verify the displacements and deformations and theefforts developed by the structure. The ultimate and in-use limit state criteria for the Brazilian standard ofreinforced concrete (NBR 6118) were observed for the study. In addition, the records and analyses of thestructure’s pathologies, found in the building, are presented. The main structural elements with their respectivepathologies are described, detected by visual inspection, and then the numerical tests performed are shown. Dueto the presence of several cracks among other pathologies in the building, an elastic instability analysis of thestructure was performed to verify the collapse load factor, using the Rankine-Marchant analysis model. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://publicacoes.softaliza.com.br/cilamce2023/article/view/4960 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 https://drive.google.com/file/d/1_8t8BwisOADJNhx0UhXG_GU2g5gE1yA3/view?usp=sharing

oai:publicacoes.softaliza.com.br:article/4961 2024-05-11T12:11:48Z cilamce2023:M11

Phase-Field modelling of ramdomly representative volume elements Hugo M. Leão Saulo S. de Castro Roque L. da S. Pitangueira First keyword Second keyword Third keyword Real-world engineering materials are usually heterogeneous in nature. Taking concrete as an example,it is composed of sand, gravel, a cementitious matrix, in addition to various voids and imperfections caused bychemical hardening reactions inherent of the material itself. To model those kinds of materials, the Phase-FieldModelling has been widely used by the scientific community due to the advantages presented by it like the abilityto detect crack nucleation and to obtain its full path. For that, this model considers the smeared variational formof Griffith’s sharp crack that spreads over a portion of the domain according to a length scale parameter. ThePhase-Field is inserted into the problem through an additional equation that solves, for each degree of freedom,its variable that varies from 0 to 1 and indicates the damage. The purpose of this article is to use the Phase-FieldModels with heterogeneous material to study the behaviour of RVE for different sizes and grading curves. All theimplementation was done in INSANE, an open-source software, developed in Java at the Structural EngineeringDepartment of the Federal University of Minas Gerais. Numerical results will be presented. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://publicacoes.softaliza.com.br/cilamce2023/article/view/4961 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4961/4048 https://drive.google.com/file/d/1n6crDJbCEr5oCoaBhtmmDGdtyLLSz0m1/view?usp=sharing

oai:publicacoes.softaliza.com.br:article/4962 2024-05-11T12:11:47Z cilamce2023:M11

Analysis of the Battistero di San Giovanni’s behavior subjected to seismic events Sabrina LF Vitor Roberto Corazzi Graciela Doz dynamic modal earthquakes historical monument Florence The analysis behavior of historical structures over the years constitute a fundamental research’s field toperpetuate the constructive methods and the cultural heritage of civilizations. Such analyzes involve not only thestatic aspect but also the seismic action, present in a large part of the world territory and which subjects severalstructures to vibrations. Evaluating the historic masonry construction’s vulnerability against earthquakes, manystudies are carried out to guarantee the protection of structures and consequently the cultural heritage. With theease of access to computational means, a large part of the historic building’s studies has been carried out using thefinite element method, with the aid of computational tools made available by commercial software. In this context,the Italian municipality of Florence, which has the highest concentration of universally renowned works of art, isin a seismic zone, presenting episodes of earthquakes in the month of June 2023, with 4.0 Mw of magnitude. Thus,the present work aims to numerically analyze the dynamic behavior of the Battistero di San Giovanni, from the4th-5th centuries, located in Florence. Its behavior against seismic events is evaluated from the structural analysisby the finite element method, using the ABAQUS software. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4962 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4962/4049

oai:publicacoes.softaliza.com.br:article/4963 2024-05-11T12:11:47Z cilamce2023:M11

Comparative analysis of the structural systems of blocks A and B of the architectural set of the Attorney General of the Republic of Brazil, Brasília, DF Stefano Galimi Márcio Augusto Roma Buzar João da Costa Pantoja Valmor Cerqueira Pazos Ana Luiza Alves de Oliveira Structure Architecture Oscar Niemeyer Attorney General’s Office Oscar Niemeyer's work, recognized in the landscape of international architecture, has always attractedthe attention of architects and engineers to discover the dichotomy and paradigm that exists between structure andarchitecture. Among the Works of Oscar Niemeyer of the 2000 ́s, symbol of the juridical order and the democraticregime, the “Attorney General’s Office” stands out for being constituted by an architectural complex of sixbuildings. The geometric forms of this complex are defining a monumental space represented by two mainbuildings, realized by two constructive technologies and different structural solutions. The block “A”, supportedby a cable-stayed system, and the block “B”, supported by reinforced concrete pillars, demonstrates how thestructure is strongly linked to the design of architectural morphology. Through a structural analysis carried out bythe SAP2000 program, it was possible to identify the structural models that constitute the Attorney ́s project toobtain numerical data that represent the innovation of constructing the same architectural object through twoantithetical conceptions. This study of the work in question allowed to understand the patterns that characterizethe formal aspects of the structural technology used by the genius of the Brazilian architect and the relativeconstructive methods adopted. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4963 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4963/4050

oai:publicacoes.softaliza.com.br:article/4965 2024-05-11T12:11:46Z cilamce2023:M1

Energy Harvesting Using a Piezoelectric Nonlinear Energy Sink (PNES) to an Aeroelastic System Ana Carolina Godoy Amaral Marcos Silveira Electrical Parameters Nonlinear energy sink Flutter Energy Harvesting The influence of piezoelectric nonlinear energy sink (PNES) on the dynamic behaviour of an energy harvesting system applied to an aeroelastic structure in flutter condition is studied. NES is often used in aeroelastic systems to decrease the amplitude of vibration, possibly attenuating , controlling or delaying typical aeroleastic phenomena, such as flutter, galloping and VIV (vortex-induced vibrations). It is also able to harvest energy and distribute this energy to electric devices available in the system. The dynamic response of the PNES with en-ergy harvesting was analysed for four cases: linear case, only cubic nonlinear stiffness, only quadratic nonlinear piezoelctrical coupling and both nonlinear terms combined. The inclusion of nonlinear terms increased flutter speed, and the combination of both nonlinear terms have the greatest increase. The cubic nonlinear stiffness is responsible for increasing the equivalent stiffness of the system, which causes a decrease in the amplitude of the system response, while quadratic nonlinear piezoelectrical coupling increases the energy harvest of the system, which also decrease the amplitude and increase the electric energy harvested. The influence of electric parameters in flutter speed and power were also studied. The variation of these parameters is able to maximize flutter speed and electrical power. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4965 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4965/4052

oai:publicacoes.softaliza.com.br:article/4966 2024-05-11T12:11:46Z cilamce2023:M11

Structural Degradation Assessment of RC Buildings: Application via Software of the method of assessment by integrity and safety - MAIS Method - in a Heritage Case Study in Brasilia Ana Luiza Oliveira João Pantoja Humberto Varum Stefano Galimi Risk Management Reliability MAIS Method RC Buildings Structural Assessment The assessment of an existing structure is a complex task that necessitates a thorough understanding ofthe materials involved, the applied loads, environmental aggressiveness, and various other factors to accuratelyevaluate its functionality and predict structural safety levels. This process is challenging due to the numerousuncertainties inherent in it, as buildings do not always reveal the condition of their internal components andmaterials. In response to these challenges, the Method of Assessment by Integrity and Safety - MAIS Method - has been developed over the past five years. One of the modes that the MAIS Method can be employed involvesthe utilization of a structural software. Through on-site surveys, data is collected, enabling the quantification ofthe integrity of each constituent element within the system. Subsequently, structural modeling is carried out usingdedicated software for both the intact structure and the degraded structure, incorporating the integrity index directlyinto the elasticity index of each structural element. The software is then executed, and a comparative analysis isconducted between the two structural representations. The study focused on a building located in the Asa Sulregion of Brasília, Brazil, recognized as a UNESCO World Heritage Site. The present research concludes that theMAIS Method is efficacious, facilitating visual identification of the structural condition. Furthermore, itestablishes the feasibility of conducting both global and local analyses of the structure. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4966 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4966/4051

oai:publicacoes.softaliza.com.br:article/4968 2024-04-26T19:19:31Z abmec2023:M1

oai:publicacoes.softaliza.com.br:article/4969 2024-05-11T12:11:45Z cilamce2023:M11

Numerical analysis of vibrations of cable and tower of electric power transmission lines JY Farias RSYRC Silva ACO Miranda M. Guimarães Vibration Tower Cable Electric Transmission Lines This article presents preliminary results on the behavior of towers and cables in power transmissionlines using a three-dimensional numerical model. Computational analyses were performed considering the plasticbehavior of ASTM-A36 and ASTM-A242 steels used in the tower. The mechanical model included rigidconnections and fixings, and four vibration modes of the metal tower were obtained: transverse, longitudinal,torsional, and flexural. To validate the dynamic behavior of the cable, the classical problem of the violin stringwas used, verifying that natural frequencies increased with cable tension. Receptance analysis allowed obtainingdisplacement curves as a function of wind excitation frequency for different orientations. Critical wind excitationfrequencies were related to the vibration modes of the structure. The geometry and dynamic behavior of thetransmission tower and cable were explored, providing information on vibration frequencies and dynamic responseof the structure under different wind orientations. Four vibration modes were found: transverse, longitudinal,torsional, and beam bending. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4969 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4969/4055

oai:publicacoes.softaliza.com.br:article/4970 2024-05-11T12:11:44Z cilamce2023:M40

Python Program for 3D Linear Static Reticular Structural Analysis Based on Finite Element Method Gabriel C. Ferreira Maria SM Sampaio python 3D structural analysis finite element method static analysis reticular finite elements Structural analysis in civil engineering is the method, in which, the response of a real-world structurebefore its design and construction is predicted. For any non-simplistic structure, it's hard to conceive the analysisby hand without relying on simplifications, that by themselves, sacrifices precision of the analytical solutions.Therefore, to solve these structures quickly and accurately, a computational tool is needed. These computationaltools, usually available in commercial version, come at a high monetary cost, causing inaccessibility for studentsto have access, even for confirming and/or learning purposes. In this regard, this paper proposes to develop a freeand open-source computational tool, able to make structural analysis of reticular structures in 3D linear-staticregime. To make it possible, the Finite Element Method for structural discretization and the Python programminglanguage were used. Analytical and numerical examples available in the literature were exhaustively tested. Thedifferences between the solutions obtained with the numerical tool and the reference solutions are in the range of10-7 to 10-5 showing the good performance of the implemented tool for the tested examples. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4970 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4970/4056

oai:publicacoes.softaliza.com.br:article/4972 2024-05-11T12:11:44Z cilamce2023:M12

Modeling in digital rock analysis: an image segmentation tutorial Felipe F. Alves João Leal Ricardo Leiderman Andre Pereira image segmentation petrophysics micro-CT image-based analysis modeling Image-based simulations are fundamental to assist in rock characterizations using a fully digital envi-ronment. The basic workflow in digital rock physics or petrophysics comprises three general phases: 1) 3-D scan: image acquisition and reconstruction, 2) 3-D modeling: image processing and segmentation, and 3) 3-D analysis: image simulation and characterization. In this work, we focus in the modeling phase, by presenting two educa-tional approaches to perform image segmentation of rock samples. The first approach relies completely in the use of software with user interfaces, whereas the second one is a fully script-based approach relying in open source packages with Python APIs. Although we describe educational approaches, which adopt compact sets of dedi-cated strategies, they can also be combined to achieve the best performance and learning process. We assume here that the images were acquired by high-resolution X-ray micro-computed tomography (micro-CT), and that theywill be employed to perform rock characterizations, such as determination of the effective absolute permeabilityof porous materials based on the concepts of numerical homogenization. Therefore, step-by-step procedures andimplementations to achieve high quality segmented images are described. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4972 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4972/4057

oai:publicacoes.softaliza.com.br:article/4974 2024-05-11T12:11:43Z cilamce2023:M12

Isogeometric analysis with interactive modeling of multi-patches NURBS João Carlos L. Peixoto Rafael L. Rangel Finite Element Method, Isogeometric Analysis NURBS Educational Software Object-oriented Programming Isogeometric analysis (IGA) is an innovative method of numerical analysis of structures that seeks tounite design and simulation, allowing the creation of computational models that preserve the exact geometry ofthe problem. This approach uses mathematical functions known as NURBS (Non-Uniform Rational B-Splines),widely used in CAD systems to model curves and surfaces. In the context of the IGA, these same functions thatdefine the geometry are used to approximate the field variables. This work aims to provide a computational toolfor two-dimensional isogeometric analysis, covering the stages of modeling, analysis, and visualization of theresults. It is worth mentioning that the visualization of results is still a prototype under development. The systemconsists of two software: FEMEP (Finite Element Method Educational Computer Program), developed in Python,responsible for geometric modeling, and FEMOOLab (Finite Element Method Object-Oriented Laboratory), aMATLAB software used for analysis and display of results. The proposed tool presents an intuitive graphical userinterface (GUI) to facilitate the visualization and manipulation of NURBS curves, providing advanced modelingfeatures. The device also includes features for the automatic intersection of curves and region recognition tosimplify and streamline the modeling process. In addition, the modeling software is also responsible for managingattributes such as material properties and natural and essential boundary conditions. A relevant aspect of this workis to provide open-source code, allowing the user and developer community to collaborate and contribute to thecontinuous development of the tool. This open-source approach encourages innovation and shared growth,fostering an environment for collaboration and mutual learning. This tool aims to make isogeometric analysisaccessible even to users with basic programming knowledge, expanding its scope and enabling its application invarious projects and engineering studies. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4974 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4974/4058

oai:publicacoes.softaliza.com.br:article/4975 2024-05-11T12:11:43Z cilamce2023:M12

LESM: An interactive-graphics open-source educational software in MATLAB for static and dynamic structural analysis Luiz F. Martha Claudio HB Resende Pedro C. Lopes Rafael L. Rangel This paper highlights the latest advancements in LESM (Linear Elements Structure Model), an educational software designed to analyze frames, trusses, and grillages. Developed as an open-source project using MAT- LAB, LESM boasts a user-friendly Graphical User Interface (GUI) that facilitates modeling and post-processing. The primary focus of the latest version of LESM centers around dynamic analysis, which necessitated substantial modifications to the program’s analysis module. The notable enhancements encompass integrating inertial and damping effects, robust support for time-dependent load conditions, and introducing a transient analysis solver that accommodates multiple time integration schemes. The upgraded GUI is one of the most significant improvements, empowering users to leverage the dynamic analysis features interactively. This development holds immense po-tential in academic applications, offering students and researchers a valuable tool for exploring and understanding structural dynamics. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4975 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4975/4059

oai:publicacoes.softaliza.com.br:article/4976 2024-05-11T12:11:42Z cilamce2023:M12

Tri-objective optimization of 3d Steel Frames Considering Columns Ori- entation and Bracing System Configuration as Design Variables Claudio HB Resende Afonso CC Lemonge Structural optimization multi-objective steel frames bracing systems meta-heuristics In the field of steel structural design, particularly in the context of tall buildings, there is a need to minimize costs while enhancing performance with regards to dynamic behavior, and structural stability. Furthermore, determining the most suitable geometric configuration for the bracing system and the optimal orientation of the principal axes of inertia for the columns is not readily apparent. Typically, such decisions are based on the expertise of the designer. Consequently, solving this complex problem, which involves simultaneously considering three objectives, is far from  straightforward. Hence, this paper focuses on the tri-objective optimization of spatial steel frames, considering both the configuration of the bracing system and the orientation of the columns as design variables. To accomplish this, four differential evolution algorithms have been employed: the third evolution step of generalized differential evolution (GDE3), the success history-based adaptive multi-objective differential evolution (SHAMODE), the SHAMODE with whale optimization (SHAMODE-WO), and the multi-objective meta-heuristic with iterative parameter distribution estimation (MM-IPDE). Additionally, a multi-criteria tournament method is utilized to extract desired solutions from the Pareto front, aligning with the preferences of the decision-maker. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4976 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4976/4060

oai:publicacoes.softaliza.com.br:article/4977 2024-05-11T14:23:38Z cilamce2023:M12

A phase-field model to simulate hydraulic fracture propagation Eduarda M. Ferreira Roque LS Pitangueira Lapo Gori Hydraulic fracture Pressurized fractures Phase field models of fracture INSANE software The term hydraulic fracturing is used in problems where the fracture starts and propagates due to the hydraulic load of the fluid inside the fracture. In petroleum engineering, hydraulic fracturing is mainly used to re-cover oil and gas from reservoirs. For structural engineering, a great interest is in the analysis of concrete structures that are exposed to hydraulic environments, such as dams, offshore platforms, and bridges. Given the relevance of the subject, the aim is to study the hydraulic fracturing process using a phase-field model. Phase-field models have been intensively studied in the last decade regarding their application in hydraulic fracturing problems, with emphasis on its variational formulation that allows the detection of the initiation, propagation, and nucleation of any number of cracks without the need for additional techniques. The adopted model has been studied and extended by several researchers over the years, who have shown its robustness and efficiency. It is considered a homogeneous and impermeable reservoir and an incompressible fluid, which is not explicitly modeled, only its effect on the crack is considered, indirectly, from the phase-field model. All implementation and numerical simulations were carried out in the INSANE (INteractive Structural ANalysis Environment), an open-source software developed at the Structural Engineering Department of the Federal University of Minas Gerais. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4977 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4977/4062

oai:publicacoes.softaliza.com.br:article/4979 2024-05-11T12:11:41Z cilamce2023:M13

Computational Model for the Optimization of the Generation of Thermal Power Plants in Brazil Dayana K. Kuchenbecker Thermal Operations Planning Optimization Algorithm Numerical Modeling An organized infrastructure and available energy resources are fundamental for the development of a country to be continuous and effective. Although Brazil has many natural resources and a large water structure, other types of energy generation sources are required to contribute to the country's energy demand. Given this, thermoelectric generation has characteristics that make it capable of guaranteeing the necessary complementation, making the reliable system. For this, the planning of the hydrothermal operation is necessary to determine the optimal generation to guarantee the supply with efficiency, safety and economy. Given the complexity of the system, computational models help in decision-making on determining the optimal generation. Therefore, this research work seeks to explore a methodology that aims to determine the optimal generation of thermoelectric plants in part of the Brazilian system, based on the necessary complementation determined by the optimal generation of hydroelectric plants. In this study, the real data from the Brazilian system, available on the NEWAVE deck, were modeling and processed by Linear Optimization Toolbox of MATLAB® program. After the performance of tests, satisfactory results were presented and demonstrated that the proposed methodology is efficient for determining the generation of the thermoelectric system. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4979 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4979/4064

oai:publicacoes.softaliza.com.br:article/4980 2024-05-11T12:11:40Z cilamce2023:M13

Solution of bound constrained nonlinear least squares problems with ap- plication to backcalculation of asphalt pavements Lia BG Furtado Evandro Parente Jr. Elias S. Barroso Nonlinear Least Squares Bound Constraints Backcalculation Asphalt Pavements Backcalculation is a procedure used to estimate the material properties of pavement layers from results of non destructive tests, as the Falling Weight Deflectometer. It is important to assess the quality of a pavement construction and/or to monitor its condition during its lifespan. The Finite Element Method can be used to evaluate pavement deflections, provided that the loading and the properties of each layer are known. Assuming linear elastic behavior and known Poisson’s ratios, the backcalculation procedure consists in the determination of the elastic moduli that minimize the differences between the simulated and measured deflections. Thus, pavement backcalculation corresponds to the solution of a Nonlinear Least Squares problem, where the unknown parameters (elastic moduli) are strictly positive. This paper presents a simply approach to include bound constraints in the Gauss-Newton and the Levenberg–Marquardt methods to ensure convergence to physically meaningful solutions. The accuracy, robustness, and computational efficiency of the modified algorithms are compared in the backcalculation of asphalt pavements. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4980 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4980/4065

oai:publicacoes.softaliza.com.br:article/4981 2024-05-11T12:11:39Z cilamce2023:M13

Metamodel-assisted metaheuristic for structural optimization problems Érica CR Carvalho Afonso CC Lemonge Kenedy GF Júnior Patrícia H. Hallak Structural Optimization Problems Metaheuristics Machine Learning Metamodels Optimization problems are common in many different areas, especially engineering. The complexity of modern problems has led to the development of increasingly complex mathematical models, resulting in expensive simulation models. An alternative for solving these problems is population-based metaheuristics, especially those of natural inspiration. However, they usually require many evaluations to obtain a feasible or even satisfactory solution. In this context, the application of metamodels, or surrogate models, together with metaheuristics, has received the growing attention of researchers in several areas. The metamodels generate a simpler computational model to be used in parts of the optimization process, replacing the original model. This work presents an application strategy of metamodels within metaheuristics, which allows for computational cost reduction. The methodology is applied to structural optimization problems, demonstrating its applicability and establishing it as an alternative to improving solutions in the context of fixed-budget simulations. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4981 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4981/4066

oai:publicacoes.softaliza.com.br:article/4982 2024-05-11T12:11:39Z cilamce2023:M2

Numerical Simulation Of FPCB Shear Connectors For Thin Sheets Ariany C. Pereira Rodrigo B. Caldas Cristiane C. C. Lopes Thin sheet Ductility Slip capacity Composite dowel Shear connector In this work, experimental investigations were conducted, and a numerical model was proposed to analyze the behavior of circular openings with transverse bars as steel-concrete shear connectors (FPCB).Although the effectiveness of these connectors for thick plates has already been proven by previous works, the application of circular openings with transverse rebar shear connectors to thin sheets has not been widely evaluated yet. This paper presented the development of the numerical model for the analysis of circular openings with transverse bars as steel-concrete shear connectors. The three-dimensional model of the plug-in test adapted for the analysis of these connectors was performed in the finite element program ABAQUS. The C3D8R solid element was used to simulate the concrete block, the steel sheet, and the steel rebar. For the steel stirrups, T3D2 truss elements were used. To simulate the concrete the Concrete Damaged Plasticity (CDP) model was adopted and for the steel elements the bilinear simplified curve was implemented. The aim of this paper was to compare it with experimental tests performed by the author and to demonstrate its capacity to efficiently represent the behavior of the circular openings with transverse rebar shear connectors to thin sheets observed in the experimental test. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4982 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4982/4067

oai:publicacoes.softaliza.com.br:article/4983 2024-05-11T12:11:37Z cilamce2023:M13

Sensitivity analysis of flexible multibody systems with nonlinear beams JJ Arribas Montejo JC García Orden F. Gabaldon Castillo D. Dopico Dopico Multibody Flexible Sensitivity Beam Optimization of the dynamics of multibody systems is an active area of research with many important applications in different fields. Among many available optimization techniques, gradient methods are very versatile and popular; and one of its main ingredients is the computation of sensitivities. Sensitivities provides information about how the coordinates of the system change with time when the parameters change. Since multibody systems are typically represented by systems of nonlinear differential equations (or algebraic-differential systems), sensitivities are computed evaluating the corresponding derivatives respect the parameters around the reference movement. These derivatives (sensitivities) depends on time and are the solutions of a system of linear differentialequations (with variable coefficients). Their computation may be performed after the solution for the dynamics, or simultaneously with it. Sensitivity analysis of mechanisms exclusively composed by rigid bodies has been studied in many works of the literature. However, analysis dealing with flexible mechanisms are rarer. In this work we show the results of a sensitivity analysis of special systems, where the flexible parts are slender beams represented by a nonlinear beam model. Their sensitivity contributions are computed analytically improving the efficiency and accuracy of the computations. What is more, a robust and physically intuitive approach based on a finite-difference method is presented for obtaining preliminary sensitivity results, that provide a valuable tool for developing and validate the previously described analytical approach. Some simple numerical examples are presented showing the performance of the proposed approach. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4983 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4983/4069

oai:publicacoes.softaliza.com.br:article/4984 2024-05-11T12:11:38Z cilamce2023:M10

Estimating geomechanical parameters from hydraulic fracturing tests using a soft computing-based methodology Rafael Abreu Cristian Mejia Deane Roehl Leonardo Cabral hydraulic fracturing geomechanical parameter identification neural networks genetic algorithm The discovery of naturally fractured reservoirs in the Brazilian pre-salt has attracted considerable attention for a better understanding of reservoir characterization and fluid flow inside fracture channels. Predicting the hydromechanical behavior of these reservoirs is a cumbersome task, which requires the identification of their geomechanical parameters. In this scenario, a soft computing-based methodology is implemented to estimate geomechanical parameters from borehole injection pressure in hydraulic fracturing tests. Based on artificial intelligence techniques, this approach integrates a proxy model and an optimization algorithm to match the field measurements and the borehole pressure curve predicted by a finite element model. Considering a multistep-ahead strategy to predict time series, a multilayer perceptron-based proxy model computes the borehole pressure curves, substituting the numerical simulation of a minifrac test. The adoption of a proxy model substantially reduces the computational effort of the parameter identification task. Therefore, a genetic algorithm can efficiently estimate the reservoir geomechanical parameters by solving a nonlinear least squares problem. The application to field-measured data from a minifrac test confirms the capability of the proposed methodology to estimate geomechanical parameters from hydraulic fracturing tests. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4984 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4984/4068

oai:publicacoes.softaliza.com.br:article/4985 2024-05-11T12:11:36Z cilamce2023:M13

Analysis of CO2 Emissions in the Topological Optimization of Floor Systems Composed by Composite Trusses Chayana Gomes Morgner Beatriz Vargas Afonso Isabela Oliveira Maia da Silva Adenílcia Fernanda Grobério Calenzani Élcio Cassimiro Alves Composite floor Composite Tubular Trusses CO2 Emission Genetic Algorithm Particle Swarm Optimization The use of composite floor systems in steel buildings has been growing over the last few decades. However, this application usually takes place with full web composite beams and composite slabs with incorporated steel formwork, although there are other possibilities, such as, for example, trusses composite beams. The objective of this work is to present the formulation of the topological and sizing optimization problem for floor systems composed of composite trusses with tubular steel profiles and composite slabs. A structure for the floor, secondary trusses are proposed that directly support the slabs and main trusses that serve as support for thesecondary trusses. The trusses are simply supported and the upper compressed chord may or may not be filled with concrete. The objective function minimizes CO2 emissions from the manufacture of materials used in the floor. The optimization problem solution was obtained via Genetic Algorithm (GA) and the Particle Swarm Optimization (PSO). The algorithm selects, in addition to the topology of the truss (height and number of truss panels), the ideal number of secondary trusses, the compressive strength of the concrete slab and the filling of the upper chord, and finally, it selects the profiles of the chords, diagonals and verticals and composite slab formwork from manufacturers' catalogues. The results indicate that, when compared with composite floor systems composed offull web beams, a reduction in CO2 emissions of over 20% can be obtained depending on the spans of the analyzed floors. In addition, tubular trusses with a concrete-filled upper chord provide better solutions than trusses with an unfilled tube. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4985 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4985/4070

oai:publicacoes.softaliza.com.br:article/4986 2024-05-11T12:11:35Z cilamce2023:M13

Multi-Objective Harmony Search applied to minimize cost and displacement of steel-concrete composite beams Fernando Luiz Tres Junior Guilherme Fleith de Medeiros Moacir Kripka Multi-Objective Harmony Search (MOHS) multi-objective optimization Pareto front steel-concrete composite structure During the design of structures, it is common for the engineer to come across situations in which different and conflicting objectives must be assessed, where the multi-objective or multicriteria optimization provides subsidies to assist in decision-making by designers. In this sense, this paper aims to present the cost and displacement minimization of steel-concrete composite beams, applying the Multi-objective Harmony Search (MOHS) algorithm. The steel-concrete beam is represented by nine design variables, namely the concrete strength of the slab, the slab thickness, the dimensions of the welded steel beam, and the interaction degree. Solutions areverified in terms of ultimate and serviceability limit states according to Brazilian standards. With the optimization results, a Pareto front is generated, and the efficiency of the MOHS is evaluated from the comparison with results of another multiobjective optimization algorithm already consolidated in the literature, the Nondominated Sorting Genetic Algorithm II (NSGA-II). XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4986 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4986/4072

oai:publicacoes.softaliza.com.br:article/4988 2024-05-11T12:11:35Z cilamce2023:M2

Timber Cross-Section Verification in Fire Situation Jackson S. Rocha Segundo Caroline A. Ferreira Ricardo A. M. Silveira Rafael C. Barros Dalilah Pires Ígor J. M. Lemes thermal analysis fire situation timber cross-section CS-ASA/FA SAFIR Temperature has a significant influence on the timber structural elements behavior. Such material, anisotropic, with irregular fibers and the presence of knots, and flammable, when exposed to high temperatures (fire situation), has its physical and resistance properties deteriorated. This deterioration leads to a considerable loss of stiffness and strength of timber structural systems. During a fire, the thermal analysis of the structural element cross-section becomes dominant, since the behavior of the beam, column, truss or frame under high temperature depends directly on this phase. This thermal analysis allows for determining the temperature fieldvariation through the boundary conditions adopted for the timber cross-section model. Therefore, the objective of this study is to carry out transient thermal analysis, via FEM, of a timber cross-section widely used in civil construction. Such numerical analysis will be carried out through the CS-ASA/FA module with additions of graphical interfaces via GiD platform. Thus, a more complete and accurate visualization of the temperature field variation in the timber cross-section is expected. Finally, comparisons are made with other literature or software results, as SAFIR, to prove the capability of the CS-ASA/FA module and GiD graphical interfaces. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4988 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4988/4071

oai:publicacoes.softaliza.com.br:article/4989 2024-05-11T12:11:33Z cilamce2023:M13

Optimal Reconfiguration of the Eletric Power Distribution Network with High Photovoltaic Generation and Overvoltage Yanick R. Gomes Diego José da Silva Edmarcio A. Belati Distribution Network Reconfiguration Power Loss Voltage Optimization Flower Pollination Algorithm Photovoltaic Energy Distribution Network Reconfiguration (DNR) is the most common method employed by distribution network operators to achieve optimal system operation. The proliferation of Renewable Energy Sources (RES), particularly photovoltaic (PV) energy generation, in modern distribution networks has introduced novel challenges in network planning and operation. In this context, this paper introduces a DNR strategy involving the manipulation of network topology through switch opening and closing, integrated with a Modified Flower Pollination Algorithm (FPA-M). The primary aim is to minimize active power losses and regulate voltage levels at distribution system buses, particularly under high PV generation. The problem formulation takes the form of a Mixed IntegerNonlinear Programming (MINLP), encompassing continuous and discrete variables. The FPA-M method is an efficient meta-heuristic algorithm inspired by flower pollination processes. Compared to alternative methods, the FPA-M boasts a single control parameter and proves highly effective in optimization problems. The study’s central contribution lies in enhancing algorithm performance and reducing computational effort through a refined determination of the search space. The proposed approach is evaluated across diverse operational scenarios, including load curves and PV data collected from the Federal University of ABC. Tests are conducted on a 33 bus distribution system, and results are benchmarked against other methodologies from the literature. The findings underscore that the amalgamation of FPA-M with DNR yields substantial energy loss reductions, effectively maintaining voltage levels within acceptable bounds throughout the evaluation period. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4989 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4989/4073

oai:publicacoes.softaliza.com.br:article/4990 2024-05-11T12:11:33Z cilamce2023:M20

Analysis of one-vs-all versus one-vs-one approaches in lithofacies classification Genesis, Gallileu Fernandes Gomes, Igor Antonio Barbosa, José Lithofacies classification Multiclass classification One-vs-One One-vs-All XGBoost The lithofacies classification provides valuable information about the geological history and the depositional environment. For multiclass classification tasks, as is usually the case with lithofacies classification, there are two basic approaches for building the models: the One-vs-One (OvO) and the One-vs-All (OvA) approaches. In general, when building models, default settings are typically employed, without conducting a detailed study to determine the most suitable approach for each scenario. In this study, we evaluated the performance of the OvA and OvO in the lithofacies classification task. The results indicate that the OvA model has lower computational cost and consistently outperforms the OvO model across almost cross-validation folds. Results on test data indicate that OvA can be a good alternative in scenarios with imbalanced classes or when there is a limited amount of data for training and testing. The OvO model can be an interesting alternative when the imbalance between classes is an important factor for the problem. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4990 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4990/4103

oai:publicacoes.softaliza.com.br:article/4991 2024-05-11T12:11:32Z cilamce2023:M20

Model constrained empirical Bayesian neural networks for inverse problems S. Philley, Russell V. Nguyen, Hai Bui-Thanh, Tan Deep learning inverse problems Bayesian methods uncertainty quantification variational inference Principled Uncertainty quantification (UQ) in deep learning is still an unsolved problem. Numerous methods have been developed so far, with Bayesian neural networks (BNNs) as the popular approach. BNNs, while inherently UQ-enabled and resistant to over-fitting, suffer from unnatural and artificial priors over their parameters. This paper develops a model-constrained framework for quantifying the uncertainty in deep neural network inverse solutions. At the heart of our approach is an interpretable and physically-meaningful prior over neural network parameters trained through use of Stein variational gradient descent (SVGD). We provide comprehensive numerical results for a 2D inverse heat conductivity problem and a 2D inverse initial conditions problems for both the time-dependent Burgers’ and Navier-Stokes equations. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4991 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4991/4076

oai:publicacoes.softaliza.com.br:article/4992 2024-05-11T12:11:32Z cilamce2023:M20

Spectral Method and Machine Learning approach to Wind Turbine damage detection Maciej Dutkiewicz, Maciej R. Machado, Marcela da Silva Coelho, Jefferson Wind Turbine Spectral Method Machine Learning Frequency Response Functions Wind energy is one of the cleanest energy source currently used in the world, an energy source that interferes least with the environment. It is important to locate Wind Farms (WF) in such a way as not to limit the living space and not to reduce the comfort of people in the area. Due to the intensity of the wind and minimal human impact, offshore farms seem to be the required solution. Another aspect important from the point of operational reliability, is ensuring continuous working conditions due to the design and material solutions. Wind Turbine (WT) structures are exposed to the dynamic action of wind and waves from the sea, as well as to the corrosive environment, causing accelerated damage to WT. The action ensuring safe use of structural elements of WT is monitoring the technical condition of the structure based on the analysis of frequency response functions (FRF). At the design, as well the operational stage, it is important to predict the failure of the element. The paper presents the simulation results of the monitoring and prediction of damage of IEA 15-Megawatt offshore wind turbine using the analysis of changes in resonant frequencies in the FRF and the Machine Learning technique. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4992 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4992/4077

oai:publicacoes.softaliza.com.br:article/4993 2024-05-11T12:11:31Z cilamce2023:M21

Using a Radial Point Interpolation Meshless Method for the numerical simulation of the viscoplastic extrusion process Rodrigues, D.E.S. Belinha, J. Natal Jorge, R.M. Fused Filament Fabrication (FFF) Viscoplastic extrusion flow formulation meshless methods Radial Point Interpolation Method (RPIM) In this work, an accurate and efficient meshless technique - the Radial Point Interpolation Method (RPIM) – is used to address the numerical simulation of the viscoplastic extrusion process, which is the initial phase of the Fused Filament Fabrication (FFF), an extrusion-based additive manufacturing (AM) process. Unlike the FEM, in meshless methods, there is no preestablished relationship between the nodes in the nodal mesh. Thus, the concept of ‘element’ is inexistent. In meshless methods, nodal discretization can be straightforwardly modified since nodes can be added or removed from the initial nodal mesh. Hence, mesh-free techniques show a particular relevance if associated with AM processes since the nodes can be distributed to match the layer-by-layer deposition of the printing process. Additionally, meshless methods have shape functions with virtually a higher order, allowing a higher continuity and reproducibility. This work combines, for the first time, the flow formulation and the heat transfer formulation in an RPIM algorithm to simulate the extrusion process of viscoplastic materials like the ones used in the FFF. The proposed algorithm is developed, implemented, and then validated for benchmark examples. The accuracy of the obtained numerical results highlights the importance of using meshless techniques in this field. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4993 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4993/4080

oai:publicacoes.softaliza.com.br:article/4994 2024-05-11T12:11:30Z cilamce2023:M21

A novel SPH algorithm to simulate tumour angiogenesis Maria Inês A. Barbosa, Maria Belinha, Jorge M. Natal Jorge, Renato X. de Carvalho, Ana cell proliferation angiogenesis smooth particle hydrodynamics meshless methods numerical simulations Nowadays, cancer is one of the foremost causes of death worldwide. As a tumor grows, it requires an increased supply of oxygen and nutrients to sustain its progression. However, once it reaches a critical size, the transportation of these molecules to the center of the tumor becomes challenging. In such circumstances, tumor cells initiate the process of angiogenesis to generate new blood vessels and so, a new nutrient source. Understanding the impact of angiogenesis on tumor progression is crucial for comprehending cancer. In recent decades, computational models have been extensively employed to investigate various biological problems, including tumor progression. The objective of this study was to develop a 3D algorithm to simulate the process of cell proliferation combined with angiogenesis. The algorithm utilizes the Smoothed Particle Hydrodynamics method and takes into account the concentration of Vascular Endothelial Growth Factor. To validate the algorithm, various high-concentration points were selected to observe whether the generated blood vessels followed appropriate paths. The proliferation process was assumed to follow an exponential pattern, and its reliance on the created blood vessels was analyzed. The results demonstrated that in all cases, the process of angiogenesis wassuccessfully integrated with the process of cell proliferation. XLIV Ibero-Latin American Congress on Computational Methods in Engineering 2024-04-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://publicacoes.softaliza.com.br/cilamce2023/article/view/4994 XLIV Ibero-Latin American Congress on Computational Methods in Engineering; v. 5 n. 05 (2023): CILAMCE 2023 por https://publicacoes.softaliza.com.br/cilamce2023/article/view/4994/4081 dece2525911e281b962f8fa117bb5aa9