2026-09-13T06:07:25Z https://publicacoes.softaliza.com.br/cilamce2021/oai

oai:publicacoes.softaliza.com.br:article/5641 2024-06-24T21:17:47Z cilamce2021:ART

Analysis of cold-formed steel truss and prefabricated concrete slab composite floor system Odivaldo B. Dias Eduardo de M. Batista Juarez M. S. Franco Composite structures Numerical analysis Shear connector Cold-formed steel members Steel and concrete composite floor systems improve the resistance capacity and flexural stiffness. Stud-ies on composite floor of buildings available in the literature consider, for the most part, open steel cross sections and solid or steel deck reinforced concrete slabs. The present work is based on the results obtained in an ex-perimental campaign carried out by the research group on steel and composite construction at the Laboratory of Structures and Materials from COPPE /UFRJ, and proposes the validation of a numerical model based on theFinite Element Method (FEM), in order to improve the knowledge of the structural behavior of the constructionsystem. This work aims to extend the original investigation of the composite structural system proposed and testedby Luiz Alberto Leal (doctoral thesis in 2019), associating lattice girder in cold-formed steel members (CFS) andcomposite unidirectional prefabricated concrete slab, for which there are few numerical and experimental studies. In this context, the present work performs the FEM-based numerical modeling, calibrated with the help of exper-imental results, consisting of CFS trussed girders and unidirectional slabs, combined with innovative thin-walled perfobond (TWP) shear connectors. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5641 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5641/4709

oai:publicacoes.softaliza.com.br:article/5642 2024-06-24T21:17:47Z cilamce2021:ART

Computational study of concrete-filled steel tube columns produced with aggregates from construction and demolition waste Athila V. Lima Mario Sergio O. Cesar Filho Alexandre M. Mont ́Alverne Leonardo M. Bezerra concrete-filled steel tube columns computational modeling recycled aggregate The use of concrete-filled steel tube columns – CFSTC had begun about 70 years ago and, until today,these elements have been widely used worldwide. The behavior of the steel-concrete system can be seen as anadvantage, since it opens space for the possibility of using alternative materials in the manufacture of concrete forcomposite columns, once the stress triaxial state minimizes the strength reductions that can occur with the use ofsuch alternative materials. For this reason, this work aimed to computationally analyze the behavior of compositecolumns of circular section filled with concrete (manufactured with aggregates of the type CDW – Constructionand Demolition Waste) and subjected to centered compression. In this study, the influence of the use of CDW inshort CFSTC subjected to axial compression was analyzed. In the present study, a computational model of shortCFSTC was constructed. Two groups of models were analyzed. Considering the results, it was possible to affirmthat the increase of strength and ductility verified in the CFSTC are very important characteristics to make possible,from the structural point of view, the use of CDW, in the production of the concretes used in concrete-filled steeltube short columns. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5642 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5642/4710

oai:publicacoes.softaliza.com.br:article/5643 2024-06-24T21:17:47Z cilamce2021:ART

Dynamic structural behaviour of steel-concrete composite floors subjected to rhythmic human activities Nathalia de A. C. Branco Felipe A. de Sousa José Guilherme S. da Silva composite floors dynamic structural analysis human comfort assessment Over the last few years, a lot of structural problems associated with excessive vibration of building floorsystems when induced by human rhythmic activities have occurred in places such as fitness centres, event hallsand offices. On the other hand, it’s well known that the resonance phenomenon can occur due to equality (orproximity) between one of the excitation frequencies and the structure natural frequencies. Having this thought inmind, this paper investigates the dynamic structural behaviour of a steel-concrete composite floor when subjectedto loadings induced by human rhythmic activities. This way, the studied structural system consists of a health clubthat presents an area used for aerobics. The composite floor system presents dimensions of 22.5 m by 14 m and atotal area of 315 m2. In this study, the dynamic loadings were obtained through the use of several dynamic load models (only force models) and also based on the modelling of biodynamic systems, to incorporate the human-structure interaction dynamic effect to the analysis. The composite floor numerical model was generated based on usual modelling techniques adopting the mesh refinement present in the Finite Element Method (FEM) andimplemented in the ANSYS program. The investigated floor dynamic structural response was calculated throughthe consideration of 20 people practising rhythmic activities on the original area specified in the project and on theother two possible areas of the structural system aiming to verify the occurrence of excessive vibration and also toassess the human comfort having in mind the recommended limits proposed in the traditional international designstandards. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5643 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5643/4711

oai:publicacoes.softaliza.com.br:article/5644 2024-06-24T21:17:47Z cilamce2021:ART

The Effect of Rounded Corners in the Moment Resistance of Steel Shuttering of Composite Slabs Mayane C. Loureiro Protáze Mageveske Élcio C. Alves Adenilcia Fernanda G. Calenzani elastic buckling analysis steel formwork finite strip method The objective of this paper is to analyze the influence of modeling rounded corners on the bendingmoment resistance of steel formworks used in composite slabs. The Finite Strip Method (FSM), as well as theconstrained Finite Strip Method (cFSM) were implemented via the software CUFSM for trapezoidal cross-sectionsto predict the bending moment resistance with the Direct Strength Method. The FSM was used to determine thecritical loads and the cFSM served to identify distinct buckling modes for signature curves without unique minima.Five different steel sheet geometries were analyzed - four commercially available sections and one extracted fromthe literature. Based on these, 4 additional geometries with no intermediate stiffeners and 5 with straight-linemodels were designed. In total, this study investigated 5 and 9 cross-sections with straight-line and rounded cornermodels, respectively. Results show a slight influence of the corners on the critical moment of local buckling, withstraight-line models reducing this value, as well as increasing the distortional critical moment. Overall, thedifference between the cFSM and the FSM decreases for the local mode when considering rounded corner modelswith stiffeners and for the distortional mode when using straight-line models with stiffeners. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5644 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5644/4712

oai:publicacoes.softaliza.com.br:article/5645 2024-06-24T21:17:47Z cilamce2021:ART

Buckling analysis of storage tanks based on the use of geometric imperfections measured by laser scan dimensional inspection techniques Matheus A. Lopes Francisco José da C. P. Soeiro José Guilherme S. da Silva Storage Tanks Wind Induced Buckling Laser Scan Inspection Nonlinear Analysis Integrity Assessment Storage tanks are thin-walled equipment often subjected to wind loadings, which may lead theequipment to structural instability. The critical buckling load of storage tanks are too sensitive to structuralimperfections, that can be present at its structure taken into account damage mechanisms which tend to reducethe structural integrity of this type of equipment along its life cycle. Inspection techniques are employed tocharacterize damage mechanisms, which in turn are assessed to evaluate whether or whether not the equipmentmay have a safe operation. The laser scan technique has been shown to be accurate in dimensional inspection ofstorage tanks. This paper focuses on the structural integrity assessment of an actual damaged surface of a realstorage tank. The tank is 43.428 m in diameter and 14.63 m in height and is used for diesel storage.Deformations are present at the structure of the tank, which are measured with an industrial laser scan. The pointcloud resulting from the dimensional laser scan inspection is used to build a finite element model taken intoaccount all geometric imperfection. Geometric and Material with Imperfection Nonlinear Analyses (GMNIA)are performed considering different load combinations and different wind pressure coefficients to assess plasticcollapse, excessive local plastic strain failure and buckling. Simulations considering structural steel shapes at theshell of the tank are performed to evaluate failure from wind induced buckling, once the structural integrity ofthe equipment is reduced by deformations present at the structure of the tank. The results show that theequipment XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5645 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5645/4713

oai:publicacoes.softaliza.com.br:article/5646 2024-06-24T21:17:47Z cilamce2021:ART

Project and construction of a didactic wind tunnel for the vibration analysis of buildings experimental models Leonardo F. de Miranda Leonardo de S. Bastos Jean C. M. Silva José Guilherme S. da Silva engineering education dynamic analysis of buildings wind tunnel The usual practise in design of structures assumes that wind effects are represented by static loads.However, the wind presents a dynamic nature, and its effects on buildings can lead to problems associated withexcessive vibrations. Therefore, it is important for Civil Engineering students to be able to investigate andunderstand the dynamic phenomena of structures. To facilitate the teaching of these concepts, this research workpresents a practical methodology supported by the construction of a wind tunnel in order to simulate the dynamicactions of the wind on representative building models. These models are exposed to the wind and the dynamicresponse is filmed using a smartphone, and then analysed using appropriate computer programmes for imageprocessing. Thus, it is possible to evaluate the dynamic structural response of the models (displacements andaccelerations), in the time domain. It is worth noting that, despite the experimental tests showing larger totaldisplacements in the wind direction, the floating part of the displacement is larger in the transverse direction,which is due to the occurrence of wind vortices. In conclusion, the authors believe that the development of thisteaching methodology will support both, undergraduate and graduate Civil Engineering students, to betterunderstand tall buildings dynamic behaviour when subject to wind actions. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5646 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5646/4714

oai:publicacoes.softaliza.com.br:article/5647 2024-06-24T21:17:47Z cilamce2021:ART

Fatigue assessment of steel-concrete composite highway bridges considering a progressive pavement deterioration model Ana Célia S. da Silva Vencislau M. Quissanga Guilherme S. Alencar José Guilherme S. da Silva highway bridges dynamic structural analysis irregular pavement surface fatigue behaviour Highway bridges are subjected to random traffic loads with relevant impact dynamic loadings alongall their service life. The road-roughness of asphalt pavements represents a key issue to the significant decreaseof the highway bridge decks service life. Having this context in mind, this article aims to develop an analysismethodology to assess the fatigue performance of highway bridges, including the dynamic actions due tovehicles and the effect of the progressive deterioration of the pavement, taking into account the road surface damages. The developed methodology is based on a linear cumulative damage rule, and the use of the Rainflow-counting algorithm and S-N curves from main design codes. The investigated structural model corresponds to a steel-concrete composite highway bridge deck, with straight axis, simple supported and spanning 13.0m by40.0m. In this work, the numerical model developed for the dynamic analysis of the steel-concrete compositebridge adopted the usual mesh refinement techniques present in Finite Element Method (FEM) simulationsimplemented in the ANSYS computational program. The results of a parametric analysis are presented aiming toverify the extension of the dynamical effects on the service life of highway bridges due to vehicles crossing onthe irregular pavement surface. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5647 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5647/4715

oai:publicacoes.softaliza.com.br:article/5648 2024-06-24T21:17:47Z cilamce2021:ART

Nondeterministic dynamic analysis and fatigue assessment of wind turbine towers Rodrigo G. Simões Leandro R. M. de Oliveira José Guilherme S. da Silva Steel wind tower non-deterministic wind dynamic loads numerical modelling fatigue verification Wind energy has been playing a very important role in whole world energy matrix. In this sense, agreat technological evolution has occurred over several decades, transforming old windmills into extremely talland slender towers, with the capacity to generate large amounts of energy. In Brazil, considering this advance,the conventional conical steel tower is a predominant type of supporting structure. According to this context, thisresearch works aims to study the dynamic structural response and structural fatigue assessment (service life) of asteel tower to support a wind turbine model MM92 by Repower. In this way, a numerical model was developedto represent the investigated tower, using the Finite Element Method (FEM) simulations implemented in theANSYS program. The analysis of the non-deterministic dynamic response of the tower is performed for severalwind velocities, having in mind a critical evaluation about the maximum values obtained for the von Mises’sstresses and the service life of the investigated structure. Finally, the results obtained along this research workare evaluated and compared with the limit values recommended by international design codes andrecommendations. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5648 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5648/4716

oai:publicacoes.softaliza.com.br:article/5649 2024-06-24T21:17:47Z cilamce2021:ART

Assessment of the human comfort of floors based on the use of biodynamic models Jefferson V. Aguiar Bárbara E. Ferreira H. Carvalho José Guilherme S. da Silva Steel-concrete composite floors Dynamic structural analysis Biodynamic Model This research work aims to investigate the structural dynamic response of steel-concrete compositefloors from the point of view of human comfort, when subjected to human walking. This way, the investigatedstructural model is related to a steel-concrete composite floor building which is composed of a hot-rolled framingsystem, with a total area equal to 1300m2.The floor system is used for normal school occupancy and is supportedby steel-concrete composite columns with a ceiling height of 3.40m. The proposed numerical model, developedfor the steel-concrete composite floor building dynamic analysis, adopted the usual mesh refinement techniquespresent in finite element method (FEM) simulations implemented in the ANSYS computational program. In thisnumerical model, the steel-concrete composite floor girders were represented by three-dimensional beam elements,where flexural and torsion effects are considered. On the other hand, the concrete slab was represented by shellfinite elements. Both materials (steel and concrete) have an elastic behavior. The complete interaction between theconcrete slab and steel beams was considered in the analysis, i.e., the numerical model coupled all the nodesbetween the beams and slab, to prevent the occurrence of any slip. Regarding the structural behavior of theconnections present in the investigated structural model, the beam-to-beam connections and the beam-to-columnconnections were considered as rigid joints. Having in mind to determine if the investigated floor framing systemsatisfies the human comfort criterion for walking vibration, the dynamic structural response of the investigatedfloor was analysed based on the peak accelerations and RMS values. A numerical study was made of the numberof people influence on the slab using a biodynamic model. Then, the modal and forced vibration analysis numericalresponses were compared to experimental responses. In addition, all numerical and experimental values weredetermined and classified according to several human comfort criteria, considering situations of the current designpractice. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5649 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5649/4717

oai:publicacoes.softaliza.com.br:article/5650 2024-06-24T21:17:47Z cilamce2021:ART

Vibration analysis and human comfort investigation of floors when subjected to rhythmic human activities Felipe A. de Sousa Nathalia de A. C. Branco José Guilherme S. da Silva Reinforced concrete floor Dynamic structural analysis Human comfort Nowadays, determined buildings structural problems can be associated, for example, to floorsexcessive vibrations subjected to human rhythmic activities. This type of structural project situation can occurwhen the rhythmic activities are performed in a group, due to the fact that produces a high degree ofsynchronization, especially when there is the proximity between one of the excitation frequencies and the floornatural frequencies. This way, this research work consists of the assessment of the structural dynamic responseof a real reinforced concrete floor with dimensions of 16 m by 35 m and a total area of 560 m2 located on theeighth story of the State University of Rio de Janeiro (UERJ). The main focus of the investigation is to study thehuman-structure interaction dynamic effect between the occupants and the reinforced concrete floor through theuse of several dynamic load traditional only-force models and also based on the use of biodynamic systems(mass-spring-damper systems). The numerical modelling of the reinforced concrete floor was performed usingthe ANSYS program, based on usual modelling techniques adopting the mesh refinement present in the FiniteElement Method (FEM). The maximum values related to the floor dynamic structural response were investigatedand compared with the human comfort criteria limits. Therefore, it was verified that the floor presents excessivevibration and human discomfort when the only force models were considered in order to generate the dynamicloads. On the other hand, when the dynamic response of the structure was evaluated considering the dynamicload models generated based on the use of biodynamic systems the structural system attends the human comfortcriteria and there are no excessive vibrations. However, it must be emphasized that this dynamic loadingmathematical model (biodynamic systems) was formulated based on experimental tests where the dynamiccharacteristics of the people and the human damping were included in the formulation. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5650 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5650/4718

oai:publicacoes.softaliza.com.br:article/5651 2024-06-24T21:17:47Z cilamce2021:ART

Comparative study between structural systems in prestressed concrete Cristiano Talhas Leandro Silva Prestressed Concrete Prestressed Losses Bridge Modeling CSiBridge This work presents a theoretical comparison of distinct modeling of a model structure through linearanalysis using the commercial structural analysis and design software, CSiBridge. The selected structure was a20.0m spar beam. The central idea was to compare its behavior when varying parameters in the models thatcharacterize the adopted prestressing system. Aspects such as the structural system, the steel class used, which isa function of the type of reinforcement, the level and type of prestressing system and the geometric design of thereinforcement, stand out. The response values investigated in all lines of study were displacements, bendingmoments and axial and shear stress, aiming to present a complete and critical analysis, pointing out possiblereasons for the perceived differences. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5651 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5651/4719

oai:publicacoes.softaliza.com.br:article/5652 2024-06-24T21:17:47Z cilamce2021:ART

Structural analysis of steel towers used in power transmission lines subjected to wind induced dynamic actions Mariana S. Rechtman José Guilherme S. da Silva latticed steel towers power transmission lines nonlinear dynamic analysis The lattice steel towers have been widely used as supports for power transmission lines becomingessential elements since their stability contributes to a better functioning and electrical safety of the transmissionsystems. Although the main loading applied to this type of structure be produced by the wind acting dynamicallyon the elements of the transmissions system (conductors, shield wires, insulators and steel towers), in the currentdesign practice the dynamic structural behaviour of the structural system (towers-conductors) is not considered.Therefore, the main objective of this investigation is to develop an analysis regarding the behaviour of powertransmission lines when subjected to wind dynamic loadings, having in mind the assessment of the forces anddisplacements of the steel towers of the system. In this research work, a power transmission line, composed by themain tower, two adjacent towers, conductors, shield wires and insulators was studied based on a finite elementmodelling, considering the wind non-deterministic dynamic characteristic, where the wind loads were modelledby an aleatory process based on their statistical properties. The results obtained along the analysis have shownrelevant quantitative differences associated to the forces and displacements values when the structural response ofthe investigated power transmission line was calculated based on a static analysis and a dynamic non-deterministicanalysis. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5652 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5652/4720

oai:publicacoes.softaliza.com.br:article/5653 2024-06-24T21:17:47Z cilamce2021:ART

Nonlinear dynamic analysis of tall buildings considering nondeterministic wind loads Jean Carlos M. Silva Leonardo de S. Bastos José Guilherme S. da Silva tall buildings human comfort assessment geometric nonlinearity In recent years, the technological advances of the civil construction associated to a favourable economicscenario have promoted the project and construction of tall buildings in several countries, such as the United States,and more recently, some of the Asian countries, like China, Malaysia and the United Arab Emirates. However, thearchitectural dareness and also the increasing in the structural project’s slenderness have been crucial to reducingthe natural frequencies values of these buildings, and in some situations, these facts could induce excessivevibration problems and human discomfort. On the other hand, other aspect generally disregarded in the currentdesign practice is related to influence of the effect of geometric nonlinearity on the building’s structural response.This way, this research work aims to develop an analysis methodology to evaluate the dynamic structural behaviourand assess the human comfort of tall buildings, when subjected to the wind nondeterministic actions, including inthe analysis the effect of geometric nonlinearity. This way, the dynamic structural behaviour of a 40-storeyreinforced concrete building, 140 m high and dimensions of 29.05 m by 9.00 m was investigated. Several numericalmodels were developed to obtain a more realistic representation of the structural system, based on the FiniteElement Method (FEM), using the ANSYS program. The results obtained throughout this investigation haveindicated important quantitative differences when the dynamic structural response of the studied building wasanalysed, having in mind the effect of geometric nonlinearity. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5653 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5653/4722

oai:publicacoes.softaliza.com.br:article/5654 2024-06-24T21:17:47Z cilamce2021:ART

Steel-concrete composite floors subjected to mechanical equipment loads: dynamic analysis and fatigue assessment Álvaro E. do A. M. Junior Francisco J. da C. P. Soeiro José Guilherme S. da Silva Steel-concrete composite floors Dynamic structural analysis Fatigue assessment This research work aims the study of the dynamic structural behavior and assesses the service life ofsteel-concrete composite floors when subjected to the vibrations induced by mechanical equipment. Thedevelopment of this research becomes necessary due to the growing issues associated with excessive floorsvibrations arising from dynamic loads, which are likely to cause human discomfort or even reduce the systemservice life. This way, the investigated structural design is based on a steel-concrete composite floor withdimensions of 5m x 5m and a total area of 25 m2. The numerical modelling of the composite floor model wasgenerated based on usual modelling techniques adopting the mesh refinement present in the Finite ElementMethod (FEM) and implemented in the ANSYS program. The applied loads were simulated based on harmonicforces related to the dynamic loadings imposed by the equipment on the concrete slab (generation unit: motor,gear unit and coupling). The investigated floor dynamic structural response was calculated by consideringseveral types of equipment acting on the floor areas specified in the project, aiming to verify the occurrence ofexcessive vibrations and assess the steel-concrete composite floor service life, considering the recommendedlimits proposed in the traditional international design standards. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5654 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5654/4723

oai:publicacoes.softaliza.com.br:article/5655 2024-06-24T21:17:47Z cilamce2021:ART

Educational tool for analysis of steel frames with semi-rigid connections Christian L. Dias Rafael L. Rangel Luiz Fernando Martha Steel frames Nonlinear semi-rigid connections Educational software The article describes the implementation in Ftool of semi-rigid connections with nonlinear behavior ofthe moment-rotation relationship. The main objective is to describe the extension of the program's graphicalinterface and its use to demonstrate the behavior of steel frames with semi-rigid nonlinear connections. Althoughit is possible to couple the physical nonlinearity of the connection with geometric nonlinear analysis, the articledeals only with physical nonlinearity. The semi-rigid connection is modeled using a finite element with two nodeswith a stiffness matrix that relates the relative rotation between the two nodes and the moment in the connection.Nonlinear behavior is provided by multi-linear curves relating moment to rotation. The monitoring of theequilibrium trajectory of the structure with nonlinear behavior is performed in an incremental-iterative mannerusing several types of classical algorithms in the literature. It is also possible to show structure buckling andvibration modes considering the linear behavior of the semi-rigid connection. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5655 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5655/4724

oai:publicacoes.softaliza.com.br:article/5656 2024-06-24T21:17:47Z cilamce2021:ART

Basic Fundamental Approach of 2nd Order Geometric Nonlinear Analysis: Concepts and Computational Implementation Sara de J. Bulhosa Lais De B. Lecchi Karina de O. Nascimento Yargo P. Souza Walnório G. Ferreira Structural Stability Geometric Nonlinear Analysis Newton-Raphson method One of the main objectives of structural engineering has been to make the structures slenderer and moreeconomical, reducing their weight and the consumption of materials without, however, compromising theirstability. The increase in the slenderness of the structural elements makes them more susceptible to large lateraldisplacements before their rupture occurs. The stability analysis of slender structural systems currently involvesthe application of the Finite Element Method (FEM). As a consequence, a system of non-linear algebraic equationsis generated and its solution is obtained, in general, through incremental-iterative procedures. This article initiallypresents structural single-degree-of-freedom systems (SDF, scalar variables), subjected to geometric nonlinearbehavior, showing their analytical and numerical solutions, using the Principle of Stationary Total PotentialEnergy. Four SDF systems, with different behaviors, are presented: stable or unstable post-critical behavior andwith and without bifurcation. Geometric imperfections are incorporated. The work ends with the presentation oftwo-degree-of-freedom systems, where the variables become matrix and vector, expanding the concepts of SDFsystems for the multi-degree-of-freedom (MDF) ones. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5656 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5656/4725

oai:publicacoes.softaliza.com.br:article/5657 2024-06-24T21:17:47Z cilamce2021:ART

Modelagem BIM e otimização com algoritmo genético de coberturas treliçadas Alexandre L. Bitencourt Silvia Corbani Juarez M. Franco BIM modelagem paramétrica O advento da tecnologia Building Information Modeling (BIM) introduziu uma mudança de paradigmano desenvolvimento de projetos estruturais na engenharia civil. Os modelos computacionais em BIM são capazesde armazenar mais dados sobre elementos e sistemas do que as tecnologias CAD e CAE que a precederam. Emlugar das usuais simplificações em engenharia, as plataformas BIM integram ferramentas de programação,modelagem geométrica e simulação de desempenho em projetos de qualquer grau de complexidade, aumentandoa produtividade e reduzindo a perda de informação entre diferentes etapas de trabalho. O maior volume de dadosdisponível torna mais difícil, em projetos de geometria incomum, que o projetista alcance soluções de altodesempenho sem o auxílio de ferramentas de Inteligência Artificial (IA). Dado o elevado custo computacional dosaplicativos BIM e das tecnologias IA em geral, faz-se necessária averiguar os limites e as potencialidades destasferramentas no projeto de estruturas, face à capacidade de processamento dos computadores pessoais disponíveisatualmente. Este trabalho visa empregar o algoritmo genético NSGA-II (otimização multicritério com fronteira dePareto) para determinar parâmetros de geometria e seção transversal dos perfis de uma cobertura de aço compostapor vigas treliçadas planas. A implementação do algoritmo é realizada no ambiente Dynamo disponível no Revit,um programa BIM, enquanto os esforços solicitantes são determinados através do Robot Structural Analysis. Sãoestudadas treliças com vão fixo e diferentes parâmetros de geometria, como, alturas, inclinações, número dediagonais e montantes, para avaliar a configuração que consume menos material. Um dos principais desafiosenvolvidos nesta tarefa é a proposição das funções de aptidão, que abarcam os objetivos a serem maximizados eas restrições de projeto que não podem ser violadas, de modo a informar automaticamente aos algoritmos deotimização os ajustes a serem efetuados no projeto. Embora as implementações realizadas nesta pesquisa indicamque a programação nos sistemas BIM pode elevar o custo computacional das tarefas de otimização, este estudoempregando o algoritmo genético NSGA-II teve um consumo de aço menor quando comparado a um valor dereferência que foi o consumo de aço de uma cobertura treliçada dimensionada conforme procedimento deescritórios de projeto. É possível diminuir o consumo de material neste valor de referência, mas o processo deredefinição dos parâmetros da estrutura e modelagem da mesma tomaria tempo do projetista. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5657 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5657/4726

oai:publicacoes.softaliza.com.br:article/5658 2024-06-24T21:17:47Z cilamce2021:ART

Numerical study of CHS-SHS T-joints with chord face failure Luiza G. V. Alves João B. S. Neto Daniel J. R. Pereira Matheus M. Oliveira Arlene M. C. Sarmanho Messias J. L. Guerra Hollow steel sections T-joints Chord face failure Slender sections. National and international normative prescriptions do not currently predict the design of joints withsections containing high slenderness values. In this work, tubular T-joints containing chords with square hollowsections and braces with circular hollow sections, which offer an easiness to the welding process, were studiedwith the intention of enabling the of lighter profiles in tubular structures. A numerical model was developed usingfinite elements in a commercial software (ANSYS), in which the stress distributions, the joint resistance, the failuremode and the load-displacement behaviors were analyzed in joints with different geometric properties. An axialcompression load was applied to the brace, and the joint results were compared with the analytical results usingthe equation recommended by ABNT NBR 16239:2013. Chord face failure was the failure mode found in allprofiles analyzed. It was observed that, for higher values of brace diameters and chord thicknesses, higher jointresistance results were found. In the joints analyzed, it was observed that the current normative design equationdid not predict the joint resistance values from the numerical model with high accuracy, with a general mean ratioof the normative joint resistance divided by the numerical joint resistance equal to 0.717. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5658 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5658/4727

oai:publicacoes.softaliza.com.br:article/5659 2024-06-24T21:17:47Z cilamce2021:ART

Structural reliability for the design of cold-formed steel I-sections members undergoing web crippling under interior loading conditions Nathália Barbosa de Melo Marcílio S. R. Freitas André L. R. Brandão cold-formed sections FORM method web crippling Cold-formed steel sections (CFS) are subjected to different buckling modes. This work presents theresults of structural reliability analysis of web crippling strength expression currently used in the BrazilianStandard, with a particular focus on I-sections (Stiffened Flanges) beams subjected to the loading conditions ofInterior-One-Flange (IOF). Previous research studies of web crippling showed that I-sections members fastenedto the bearing plate (support), subjected to IOF load case, presented inadequate reliability indexes (β) whencompared to the target reliability index. Experimental data of I-sections members reported in the literature wereanalyzed to obtain the professional factor statistics. The First-Order Reliability Method (FORM) was used forthe standard calibration procedure. The reliability analysis was developed for load combinations found in theNorth American and the Brazilian standards, in addition to the nominal live-to-dead load ratio, Ln/Dn, equal to 3and 5. Target reliability indexes usually used in the calibration of the main international standards for CFSmembers were considered. It was found that the resistance factor present in the Brazilian standard should beincreased for the I-sections members. A revision is necessary to standardize the level of safety of the design tothe limit state of the web crippling. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5659 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5659/4728

oai:publicacoes.softaliza.com.br:article/5660 2024-06-24T21:17:47Z cilamce2021:ART

Numerical modeling of cold-formed steel-concrete columns Lays R. A. da Costa Hidelbrando J. F. Diógenes Maria I. B. Valente cold-formed structures steel-concrete columns composite structures encased columns The objective of this study was to perform numerical simulations through the FEM method, usingABAQUS®, to investigate the structural behavior of Cold – formed steel - concrete columns (CFSC). Theconcrete’s influence on the system's efficiency was investigated for systems with different heights between 2.50and 3.00 meters, since most of the articles with CFSC show results for short columns up to 1 meter. The resultsshowed that the concrete favors the structural behavior, but this resistance’s gain is reduced as the systems becomehigher due to the buckling action: In the columns with 1.5 meters, concrete contributed to a more than 100 %increase in the strength of the columns, while for columns with 3 meters, this gain was only 28%. In columns with2.5 meters, this gain represents 70%. Even with the loss in strength of the composite systems due to the increasein slenderness, the encased columns with 3 meters in height presented strengths of almost 100 kN, whichcorresponds to the average values requests in small buildings. In simple steel tubular columns, these values didnot reach 60kN. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5660 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5660/4729

oai:publicacoes.softaliza.com.br:article/5661 2024-06-24T21:17:47Z cilamce2021:ART

Reliability analysis of cold-formed steel beams susceptible to distortional buckling using numerical analysis data incorporated into the professional factor variable Márcio M. da Silva Washington B. Vieira André L. R. Brandão Marcílio S. R. Freitas Reliability analysis Numerical analysis Cold-formed steel beams Distortional buckling DSM In cold-formed steel (CFS) beams subjected to simple bending with restriction to lateral-torsionalbuckling and without restriction on the compressed flange, distortional buckling can be the predominant failuremode. This work aims to develop a study on the distortional instability mode in CFS lipped C-section subject tosimple bending by numerical analysis using ABAQUS finite element software and CUFSM, a finite strip methodsoftware. The Matlab software was used to automate the modeling so that a range of numerical simulations withmaterial and geometric nonlinearity was performed and validated with experimental results from the literature. Areliability analysis with the FORM method was performed using load combinations according to the calibrationparameters of AISI-LRFD and AISI-LSD to obtain the reliability index (β) and probability of failure (PF). Fromthese results, it was observed a good achievement between the reliability indexes of the models and the establishedtarget index of βo = 2.50, a reference for the calibration of the AISI-LRFD. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5661 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5661/4730

oai:publicacoes.softaliza.com.br:article/5662 2024-06-24T21:17:47Z cilamce2021:ART

Determination of composite slabs resistance by the partial shear connection method considering friction at the support Giovanni Morais Mercuri de Figueiredo Rodrigo Sernizon Costa Mariana Velloso Barbosa Armando Cesar Campos Lavall Renata Gomes Lanna da Silva Harley Francisco Viana Mayara Lago de Matos Pereira Delmário dos Santos Gomes Galvão Composite slabs Partial shear connection Friction at the support This paper aims to evaluate the behavior and longitudinal shear strength of the steel-concrete compositeslab using the Steel Deck P75 through the partial shear connection method considering the contribution of thefriction acting in the interface of the steel deck with the concrete at the region of supports. The method proposedby EN 1994-1-1:2004 for the design of composite slab systems is based in the analytical model similar to that ofcomposite beams which allows to determine the degree shear connection between the steel sheeting and theconcrete. This method allows analysis the influence of friction at the support, in addition to the contribution ofstud bolts on the mechanical resistance of composite slab. The composite slab was tested in the Federal Universityof Minas Gerais structure laboratory which used the semi-empirical "m-k" method to obtain its resistance. Thebehavior of the composite slab system was analyses through of the graphics deflections, end slips and strains,allowing the determination of its failure mode. Finally, the results obtained from the longitudinal shear resistanceconsidering the friction at the support were applied in one practical examples. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5662 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5662/4731

oai:publicacoes.softaliza.com.br:article/5663 2024-06-24T21:17:47Z cilamce2021:ART

Stress numerical analysis of cold-formed steel angles Brenda Vieira Costa Fontes Luciano Mendes Bezerra Valdeir Francisco de Paula Metallic Structures Angles Bolted Connections Net section reduction coefficient ABAQUS This work is a stress numerical study of cold-formed tensile-loaded steel angles with bolt-connections.Due to the bolted connection, the angle does not deform evenly, resulting in a phenomenon known as shear lag,which reduces the resistant capacity of the angle under tension. This phenomenon is also investigated in thiswork. For the calculation of the piece final capacity, the hypothesis of rupture of the net section is examined andthe phenomenon of shear lag considered through the Ct factor. In order to verify the behavior of cold-formedangles with bolted connections subjected to traction, several angles were modeled using the ABAQUScommercial finite element analysis package, considering geometric and material non-linearity. The resultsobtained in the numerical analysis were compared with results of experimental tests, reaching a good agreementbetween them. However, it was verified the feasibility of numerical modeling in the support andcomplementation of experimental research involving thin sheet profiles. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5663 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5663/4732

oai:publicacoes.softaliza.com.br:article/5664 2024-06-24T21:17:47Z cilamce2021:ART

Reliability of perforated cold-formed steel channel-section beams using FORM method Rogério F. Santos André L. R. Brandão Marcílio S. R. Freitas cold formed sections FORM method perforated beams Cold-formed steel (CFS) members can be designed with the AISI Direct Strength Method (DSM) whichutilizes the local, distortional, and global elastic buckling properties of a cross-section to predict ultimate strength.The Brazilian standard also includes the DSM, but does not consider the presence of holes in the section. Thispaper develops the reliability assessment of beams, designed based on available methods in the literature adaptedfor sections with perforation. Such methods have their origin in the Direct Strength Method. An experimentaldatabase of cold-formed steel channel-section beams was established. Using this database, a statistical analysis oftest results was conducted to determine the probability distribution function that provides the best fit to theprofessional factor data and the distribution parameters. The statistical parameters of professional factor, materialstrength, geometrical properties, load type, and load ratio were considered in the reliability evaluation. Then, thestructural reliability indexes of beams subject to the local and distortional buckling modes were evaluated usingthe first order reliability method (FORM). The results showed that the target reliability index of 2.5 was not reachedwhen the load combination of the Brazilian code was applied for profiles susceptible to the distortional bucklingmode. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5664 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5664/4733

oai:publicacoes.softaliza.com.br:article/5665 2024-06-24T21:17:47Z cilamce2021:ART

Application of an incomplete similarity approach in the analysis of impact problems Mateus C. Redin Ignacio Iturrioz Alexsandro Sordi Similarity incomplete similarity impact deformable-body explicit dynamics The assessment of safety to the impact of motor vehicles requires costly experimental tests, such ascrash-tests and advanced methods of structural analysis. The design of bus structures in Brazil, for example, doesnot have adequate calculations methods and regulatory standards, and safety is difficult to assess. Therefore, amethodology is proposed for conducting impact tests on small-scale models that have incomplete similarity, inorder to facilitate access to experimental data about vehicle crashworthiness. The methodology is applied to thesimplified problem of a drop test on a fully clamped tubular steel beam. The test was numerically simulated usingthe Abaqus® software, from which it was possible to reproduce results from prototypes and models. Through amethodology presented in the literature, two models were used to correct the incomplete similarity characterizedby the parameter regarding the beam thickness. This approach demonstrated a good correlation with the numericalresults in the range of the dimensionless group in which the models were made, and started to diverge from thenumerical results as it moved away from that range. A second approach, with a second non-similar parameter, wasused for comparison with experimental data, which demonstrated a good correlation. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5665 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5665/4734

oai:publicacoes.softaliza.com.br:article/5666 2024-06-24T21:17:47Z cilamce2021:ART

Advanced parametric study of three-pinned steel arches Matheus M. Oliveira Jackson S. Rocha Segundo Iara S. Azevedo Ricardo A.M. Silveira Arlene M.C. Sarmanho Andrea R.D. Silva three-pinned arch advanced analysis steel structural nonlinear response The arches are structural elements widely used from antiquity to the present times, since these elementsgenerally present an increase in rigidity due to their curvature, outstanding in the use of drainage structures andvaults. Arches are characterized by a strongly nonlinear behavior, being an important target of study to know thestructural behavior and to guarantee reliability and safety of structures that have such an element. Thus, this workfocuses on the parametric study of three-pinned arches with physical and geometric nonlinearities. To investigate the complete behavior, first-order elastic (FOE), second-order elastic (SOE), first-order inelastic (FOI) and second-order inelastic (SOI) analyses are performed using the computer software MASTAN2. Therefore, the influence of the geometric and physical parameters, the arch’s shape, the boundary conditions, and the stiffness of three-pinnedarches are evaluated. The results obtained indicate under which conditions the arches present the better behaviorperformance in terms of stability and resistance. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5666 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5666/4735

oai:publicacoes.softaliza.com.br:article/5667 2024-06-24T21:17:47Z cilamce2021:ART

Numerical strategies for complete assessment of the moment-curvature re- lationship of steel, concrete and steel-concrete composite sections ́́Igor J.M. Lemes Rafael C. Barros Tawany A. Carvalho Ricardo A.M. Silveira Moment-curvature relationship non-linear evaluation cross-sectional analysis SCM In the non-linear evaluation of the behavior of steel, concrete and steel-concrete composite cross sec-tions, increment and iteration strategies are necessary for the complete construction of the moment-curvature re-lationship. For the correct simulation of sections composed of strain softening materials, a strategy of constant force increments fails to capture the downward stretch of the moment-curvature relationship. The present studyaims to couple path-following strategies to the Strain Compatibility Method (SCM) to pass load limit points in theconstruction of the relations that describe the mechanical behavior of the section. In this context, the generalized displacement technique, depending on the generalized stiffness parameter, and the minimum residual displace-ment method, will be adapted to the cross sectional problem. Concomitantly, strain control strategies will be implemented as a comparison parameter, since when using it, the load limit points do not prevent the completeconstruction of the cross section equilibrium paths. The constitutive relationships will be addressed explicitly aswell as the residual stresses present in the steel profiles. To validate the proposed numerical formulation, the resultsobtained are compared with numerical and experimental data available in the literature. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5667 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5667/4736

oai:publicacoes.softaliza.com.br:article/5668 2024-06-24T21:17:47Z cilamce2021:ART

Numerical study of steel trusses in fire conditions Gustavo H.C. Ferreira Jackson S. Rocha Segundo Rafael C. Barros Ricardo A.M. Silveira planar truss analysis inelastic analysis thermal loads Ftool software A structural system under fire is subject to loss of strength and stiffness and may eventually collapse.In this context, the need for studies to investigate the structural behavior under high temperatures is necessary.Therefore, the present study proposes to perform numerical analyses of steel trusses in a simplified way,considering the physical non-linear effects from the deterioration of the material at high temperatures, as describedin NBR 14323. Thus, a methodology was adopted that considers the effects caused by temperature on the stiffnessof the structural element. The calculation of displacements and internal forces is done through the Fool Software.With the reduction of the stiffness parameter, the results show that the structure displacements increase with therise in temperature, and the more accentuated this steel deterioration, the greater the influence of the external loadon the displacement. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5668 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5668/4737

oai:publicacoes.softaliza.com.br:article/5669 2024-06-24T21:17:47Z cilamce2021:ART

INELASTIC-LARGE DISPLACEMENT ANALYSIS OF STRUCTURES WITH CONTACT CONSTRAINTS Jéssica L. Silva Ricardo A.M. Silveira Ígor J.M. Lemes Christianne L. Nogueira Paulo B. Gonçalves Advanced numerical analysis Co-rotational formulation SCM-RPHM coupling Contact constraints This work presents a numerical methodology based on inelastic-large displacement approach to simulatethe 2D nonlinear behavior of structures under contact constraints imposed by the soil/rock. Non-linearities sourcesare addressed, such as: second-order effects, plasticity and contact. It is worth mentioning the adoption of anonlinear finite element formulation based on the explicit separation between rigid body movements and thosethat cause strain (co-rotational approach). The finite element formulation also considers the nodal concentratedplasticity in which the material nonlinear behavior is represented by an explicit constitutive relationship by usingthe Strain Compatibility Method (SCM). The SCM is also applied here to define any cross-sections typology strength under axial force and bending moment. Thus, this numerical formulation can be used to obtain the non-linear response of problems involving structure-support interaction. The contact constraints imposed by the soil/rock can be considered as bilateral and unilateral. In case of unilateral constraints, a penalty method is appliedin each load increment and during the iterative process. Numerical modeling of a structural circular ring undercontact constraints are presented. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5669 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5669/4738

oai:publicacoes.softaliza.com.br:article/5670 2024-06-24T21:17:47Z cilamce2021:ART

DEVELOPMENT OF A COMPUTATIONAL TOOL FOR FATIGUE ASSESSMENT OF STEEL STRUCTURES ACCORDING TO THE MASTER S-N CURVE METHOD Guilherme Alencar J. G. S. da Silva Rui Calçada Abílio de Jesus Fatigue of Steel Structures Engineering software development Master S-N curve method In a recent publication, Alencar et al [1] demonstrated that the Master S-N curve method is equallyappropriate to assess the fatigue strength of welded bridge details. The Master S-N curve method is analternative option included in the context of the American mechanical engineer’s standard (ASME Sec VIIIDiv2) in the last decade, which allows the use of coarse finite elements to carry out estimates of the remainingfatigue life of welded details, despite its advantage in the use of a unique fatigue strength S-N curve. This paperpresents the development of a computational tool for the Master S-N curve method. The tool was built intoANSYS Mechanical and allow to carry out fatigue life estimations of welded structures and mechanicalcomponents under constant amplitude loading. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5670 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5670/4739

oai:publicacoes.softaliza.com.br:article/5671 2024-06-24T21:17:47Z cilamce2021:ART

A non-linear finite volume method coupled with a higher order MUSCL- type formulation for the numerical simulation of groundwater solute trans- port Fernando R. L. Contreras Uewerton A. O. Vaz Alessandro R. E. Antunes Paulo R. M. Lyra Darlan K. E. Carvalho Groundwater solute transport Finite volume method for groundwater simulation Non-linear TPFA MUSCL A groundwater solute transport model can predict the process of contaminant migration and play an im-portant role in groundwater contamination control and remediation. In groundwater solute transport simulation, for example, reliable prediction of fluid dynamics requires a simulator that can rigorously handle highly heterogeneousand anisotropic permeability tensors on nonorthogonal grids dictated by complex aquifer geology. In this sense,to solve the equations that constitute the flow model, it is necessary to make simplifying assumptions about theaquifer and the physical processes governing groundwater flow. In this study, we applied an improved numericalformulation which deals with highly heterogeneous and anisotropic medium, that can handle distorted meshes. Thegoverning equations are solved via an implicit pressure and explicit concentration procedure, where the dispersionterm is discretized by a non-linear Two-Point Flux Approximation Method (NL-TPFA), this method is very robustand capable of reproducing piecewise linear solutions exactly by means of a linear preserving interpolation withexplicit weights that avoids the solution of locally defined systems of equations. A Monotonic Upstream CenteredScheme for Conservation Laws (MUSCL) type method is adapted for the solution of the advection term. This method is based on a gradient reconstruction obtained by a least square technique in which monotonicity is rein-forced by an appropriate slope limiter. The methods can be used with general polygonal meshes, even though we restrict ourselves to conforming triangular and quadrilateral grids. In order to validate the formulations adopted, some benchmark problems found in literature are solved. These numerical experiments suggest that our formu-lations can provide robust solutions for simulating groundwater solute transport processes, especially in aquifer systems with complex physical and geological properties. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5671 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5671/4740

oai:publicacoes.softaliza.com.br:article/5672 2024-06-24T21:17:47Z cilamce2021:ART

A Computational Tool for the Geometric Modeling of Naturally Fractured Carbonate (Karst) Petroleum Reservoirs Filipe A. C. S. Alves Artur C. R. de Souza Darlan K. E. de Carvalho Paulo R. M. Lyra Carbonate (karst) reservoir fractures mesh generation computational geometry One of the main reasons why the modeling of carbonate (karst) reservoirs is a challenging task is thegeometric representation required to capture the complex geological structures in these reservoirs, such as fractures,vugs, cavities and caves. Mesh generation from a geometrical model is thus affected by the choices made for vugsand fractures representations. An alternative approach is to assign geological features to the volumes in a fine scalemesh as physical properties. These discrete models are required when, for instance, Stokes-Brinkman’s equations are adopted to model multiphase flow simulation in carbonate karstic oil reservoirs, found often in Brazilian Pre-Salt. In this paper, we propose a computational tool for generation of karst reservoir scenarios by creating a geometrical model of the geological features and then computing the mesh volumes inside vugs, cavities, caves andfractures. Vugs are represented by randomly distributed and possibly overlapping ellipsoids in a three dimensionspace. They might be connected by fractures, modeled as cylinders, ellipsoids or boxes. Face connectivity betweenmesh volumes in a fracture is assured. The code was written in Python using the NumPy library and the IMPRESS(Intuitive Multilevel Pre-processor for Smart Simulation), an “in-house” pre-processor used for mesh management.Example scenarios were generated to evaluate the correctness and robustness of the developed computational tool. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5672 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5672/4741

oai:publicacoes.softaliza.com.br:article/5673 2024-06-24T21:17:47Z cilamce2021:ART

Single-phase flow simulation in 3-D naturally fractured reservoirs using a locally conservative formulation, an embedded discrete fracture model and unstructured tetrahedral meshes Túlio de M. Cavalcante Darlan K. E. Carvalho Paulo R. M. Lyra naturally fractured reservoirs single-phase flow embedded discrete fracture model (EDFM) Fluid flow in fractured porous media is a truly relevant phenomenon for the oil industry, but also forwater extraction and aquifer remediation. Modeling this type of problem represents a great challenge, due to thecomplexity of depositional environments. In such cases, it is particularly complex to construct structured meshescapable of adequately modeling the reservoir. In this context, in the present paper, we describe a new strategy tosimulate the single-phase fluid flows in three-dimensional heterogeneous, anisotropic and fractured porousmedia using tetrahedral unstructured meshes. Aiming to model fractures, we use the Embedded Discrete FractureModel (EDFM) in which fractures are represented explicitly, but without the necessity of building a “fracturefitting mesh”, which could be an overly complex task. To discretize the elliptic pressure equation, we use the recently developed 3-D version of the MultiPoint Flux Approximation that uses the "Diamond stencil" (MPFA-D) which is a robust and flexible formulation, capable of handling highly heterogeneous and anisotropic reservoir rocks, achieving second order accuracy for the scalar variable and first order accuracy for fluxes. Ourstrategy has shown to be notably flexible, and our preliminary results are very promising. has achieved good preliminary results. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5673 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5673/4742

oai:publicacoes.softaliza.com.br:article/5674 2024-06-24T21:17:47Z cilamce2021:ART

Numerical Simulation of Oil and Water Displacements in Petroleum Reser- voirs Using a Non-Linear Two-Point Flux Approximation Method Coupled to a Modified Flow Oriented Formulation Using a Sequential Implicit Pro- cedure Gustavo L. S. S. Pacheco Paulo R. M. Lyra Phillipe C. G. da Silva Fernando R. L. Contreras Marcio R. de A. Souza Tulio de M. Cavalcante Darlan K. E. de Carvalho Reservoir Simulation Grid Orientation Effects (GOE) Non-Linear Two Point Flux Approximation (NL-TPFA) Modified Flow Oriented Scheme (M-FOS) Sequential Implicit Procedure The numerical modeling of the multiphase and multicomponent flow in oil reservoirs is very complex and demands the development of robust and efficient computational tools. Two important issues whenever de-signing numerical formulations for the modeling such problems are the so-called Grid Orientation Effect (GOE), which is the dependence of the numerical solution with the spatial alignment of the computational grid, and thenon-monotonicity of the solution generally obtained when highly anisotropic reservoir rocks or distorted meshesare addressed. The GOE effect is linked to the anisotropic distribution of the truncation error in the numerical approximation of the transport term. The uneven amount of anisotropic numerical diffusion introduced in each di-rection may trigger a nonlinear process in which the error may grow exponentially, particularly when the displaced fluid (e.g. heavy oil) is much less mobile than the displacing fluid (e.g. water). Due to the GOE, different and, usu-ally, wrong solutions may occur considering grids with different spatial orientations with respect to the direction of the fluid flow. Besides, if the mesh is non k-orthogonal, classical Linear Two-Point Flux Approximation (L-TPFA) methods, may not even converge to the proper solution. Even the use of more robust linear Multipoint Flux Ap-proximation (MPFA) methods may produce pressure fields with spurious oscillations for highly anisotropic media or distorted meshes. Therefore, we propose a truly multidimensional cell centered finite-volume method to sim-ulate oil and water displacements in heterogeneous and anisotropic petroleum reservoirs. The sequential implicit procedure is used to handle the coupling between the pressure and the saturation equations. The elliptic pressureequation is discretized by a positivity preserving Non-Linear Two-Point Flux Approximation (NL-TPFA) usingharmonic averaging points located on cell edges. A variation of the first order Modified Flow-Oriented Scheme (M-FOS) is used to implicitly solve the non-linear hyperbolic saturation equation. Adaptive weights tune the for-mulation multidimensionality according to the grid in this scheme. This strategy is used to reduce the occurrence of Grid Orientation Effects (GOE). In order to verify the accuracy and robustness of our formulation, we test it againstclassic benchmarks available in literature. In the future, we intend to extend our formulation to higher-order, toimprove front resolution and further reducing GOE. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5674 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5674/4743

oai:publicacoes.softaliza.com.br:article/5675 2024-06-24T21:17:47Z cilamce2021:ART

On the accuracy of finite element approximations of elliptic problems with heterogeneous coefficients Giovanni Taraschi Alisson S. Pinto Cristiane O. Faria Maicon R. Correa Finite element methods Post-processings Heterogeneous coefficients Interface of discontinuity In this work, we investigate the accuracy of different finite element post-processing strategies in theapproximation of dual fields in elliptic problems such the stress tensor field in the linear elasticity problem, withspecial attention to problems with discontinuous coefficients. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5675 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5675/4744

oai:publicacoes.softaliza.com.br:article/5676 2024-06-24T21:17:47Z cilamce2021:ART

Analysis of high order multilayered functionally graded composite beams: a numerical approach R. S. de Melo F. C. da Rocha Composite materials Functionally graded materials Equivalent Single Layer theory High-order beam theory Unified beam theory Functionally graded materials (FGMs) are multiphase composites whose properties vary continuouslyin one or more directions, obeying a function that better suits the purpose of the structure. In the present work, thestudy of FGMs is integrated to multilayered composite beams with varying properties per layer. The continuity ofthe material properties from the FGM mode mitigates the stress peaks that occur in the interface between layerswith different orientations. A unified high-order theory for beams incorporating FGMs is developed and appliedto the Equivalent Single Layer theory approach to analyze single and multilayered beams using any order finiteelement method. Examples of simply supported beams are analyzed and compared to the results presented in theliterature. The proposed formulation presented results in agreement with the literature. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5676 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5676/4745

oai:publicacoes.softaliza.com.br:article/5677 2024-06-24T21:17:47Z cilamce2021:ART

Crack analysis of mesoscale concrete by FEM using an alternative mesh overlay to represent mortar and coarse aggregate Welington H. Vieira Rodrigo R. Paccola Humberto B. Coda Mesoscale concrete One of the main mechanisms of deterioration of concrete structures is cracking. As the shapes of the cracksare influenced by the heterogeneity of the concrete, when looking for a mechanical model that allows to determinethem realistically, it is necessary to discretize the structure in mesoscale. Using the positional approach of the FiniteElement Method (FEM), this work presents an alternative representation of mesoscale concrete. In this modeling,the finite element meshes that represent the coarse aggregates and the mortar are generated independently andoverlapped to form the composite material. This strategy aims to make pre-processing easier, the nodes of eachmesh need not be coincident and the degrees of freedom of the elements of the aggregates do not add any unknownsto the problem. To verify the efficiency of this model, it is applied to the concurrent multiscale analysis of a concretesample, leading to responses close to the experimental ones. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5677 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5677/4746

oai:publicacoes.softaliza.com.br:article/5678 2024-06-24T21:17:47Z cilamce2021:ART

PERFORMANCE OF ACOUSTIC METAMATERIAL BASED ON A DOU- BLE LAYER MICROPERFORATED PANEL Linconl C. B. Farias Gildean do N. Almeida Erasmo F. Vergara Leandro R. Barbosa Robson Z. Mikulski Sound absorption Acoustic metamaterial Low-frequency Double-layered In recent years, the development of models of acoustic metamaterials has received considerable promi-nence due to the several unique properties found in this absorbers. AMM based on a microperforated panel of type with internal air cavities have been promising and depending on the application provide satisfactory results at lowfrequencies. This work investigates the performance of a honeycomb type acoustic metamaterial (AMM) modeledas double-layered microperforated panels. The effective sound absorption in the frequency range between 100 and500 Hz is verified analytical, numerical and experimentally. The analytical results are corroborated numerically using a 3D finite element (FEM) method. A sound absorber sample was manufactured using 3D printing technol-ogy and evaluated in an impedance tube considering the normal incidence of waves. Sound absorption of 94% at 182 Hz with a bandwidth of 52 Hz was obtained and good agreement with the analytical model was reached. Inaddition, it is verified that this result is due to the high dissipation of sound energy in the perforation region of thefirst panel. Therefore, this sound absorber shows excellent performance to control the low frequencies. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5678 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5678/4747

oai:publicacoes.softaliza.com.br:article/5679 2024-06-24T21:17:47Z cilamce2021:ART

Numerical Investigation of Transformation Field Analysis for Elastic-Plastic Periodic Materials Christiano A. F. Varady Filho Marcio A. A. Cavalcante Transformation Field Analysis Present work analyzes the numerical cost-benefit ratio of Dvorak’s Transformation Field Analysis to evaluate elastoplastic behavior of periodically perforated metal sheets. The accuracy measurement and the process-ing time are analyzed by implementing a finite element approach integrated with the Transformation Field Analysis technique for different meshes and finite element orders. Numerical studies are employed to compare with standardFinite Element Analysis for elastoplastic analysis of periodically perforated metal sheets. The numerical resultsshow the technique’s capabilities and favorable scenarios, besides the influence of domain discretization and finiteelement order. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5679 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5679/4748

oai:publicacoes.softaliza.com.br:article/5680 2024-06-24T21:17:47Z cilamce2021:ART

Study of the parametric excitation phenomenon of a slender riser using finite element method and a reduced order model Guilherme Rocha Martins Paulo Akira Figuti Enabe Rodrigo Provasi Alfredo Gay Neto Parametric excitation finite element method reduced order model Mathieu’s instability In the context of oil and gas (O&G) exploitation, risers are slender structures connecting the floatingunit to the seabed. These structures experience static and dynamic loads with potentially high nonlinearities. It isrelevant for O&G industry to understand the riser’s mechanical behavior to improve the structure life and predictfailures. In this sense, this work focuses on the analysis of the dynamical behavior of a vertical riser (representedas a vertical beam) under harmonic excitation in the top, standing for the oscillation of a floating unit. Dependingon the structure’s mechanical properties and on the load frequency, the parametric excitation phenomenon cantake place, yielding large-amplitude lateral motion even for small vertical displacements. More specifically, thefocus is on the Mathieu’s instability regions, which occurs when the excitation frequency is an even multiple ofthe structure natural frequency. In this work, we establish a simplified analytical approach using a reduced ordermodel (ROM), which considers an Euler-Bernoulli beam model undergoing small rotation. For this purpose, theequations of motion are obtained using the extended Hamilton’s principle (EHP). By applying Galerkin’s methodusing three sinusoidal shape functions and considering a time-spatial split, ROM’s non-dimensional final equationscan be obtained. Next, an in-house nonlinear FEM-based solver, called Giraffe (an acronym for “Generic InterfaceReadily Accessible For Finite Element”) is presented and some comparative examples are performed using theROM and the Giraffe, observing their differences and similarities. These case studies were performed consideringthe structure immersed in water and air, and the excitation frequency is varied to evaluate the first and the secondMathieu’s instability region. The results presented good agreement in both models, with, in general, slightly largerdisplacements for the ROM models. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5680 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5680/4749

oai:publicacoes.softaliza.com.br:article/5681 2024-06-24T21:17:47Z cilamce2021:ART

Study on Genetic Algorithms and Constraint Handling Techniques Applied to the Optimization of Jacket Structures for Offshore Wind Turbines Rodrigo O. Cruz Grasiele R. Duarte Beatriz S. L. P. de Lima Structural optimization offshore jackets Offshore Wind Turbines Genetic Algorithm Constraint Handling Techniques Recently, steel jackets have been an attractive alternative as support structures for Offshore WindTurbines (OWT), supporting the production of wind energy. Design of offshore jackets require complex analysisdue to the dynamic environmental loads and the frequencies from the turbine operation. So, it is important toaddress coupled models where the interactions between the jacket and the turbine are considered. The jacket weightalso represents an important measure since a lighter structure has a lower cost and a potential of higher efficiency.The main objective of this work is to study optimization techniques based on Evolutionary Algorithms (EA) tominimize the weight of jackets for OWT, considering a coupled model. The structure model used in this work wasbased on that developed in the OC4 (Offshore Code Comparison Collaboration Continuation) project. A GeneticAlgorithm (GA) was applied as the optimization algorithm. Two constraint handling techniques were comparedin the problem. Preliminary results present feasible solutions which decreased the weight and natural frequencies. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5681 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5681/4750

oai:publicacoes.softaliza.com.br:article/5682 2024-06-24T21:17:47Z cilamce2021:ART

Analytical-numerical study of natural frequencies and mode shapes of interconnected acoustic cavities due to the influence of several significant parameters Montes, R. O. P Pedroso, L. P. Interconnected acoustic cavities Transfer Matrix Method Finite Element Method Tubular circuits Natural frequencies Mode shapes Nuclear power plants, industrial plants, refineries, and other engineering installations, are made up oftubular circuits traversed by fluids, and the dynamic response of these systems excited by flows, are characterized by fluid-structure problems of great interest in engineering projects. This paper presents a comparative analytical-numerical study on the behavior of interconnected acoustic cavities, considering the influence of several significant parameters, such as the number of tubes, the boundary conditions and section changes of the circuit. As a responseto the analysis, natural frequencies and mode shapes are obtained by comparing an analytical method andnumerical modeling. The analytical formulation was developed from the classic idea of the Transfer Matrix Method (TMM), considering different boundary conditions at the ends of the circuit, such as the open-open, closed-closed and closed-open system. For all cases, the fundamental equation composed by the association of several interconnected elements is obtained. All analyzes were compared with numerical simulations obtained by theFinite Element Method (FEM), with the aid of the commercial software ANSYS. The cases treated in this paperinclude the evaluation of the effects of these parameters, oriented to applications in tubular circuits, present inindustrial plants, analyzing the behavior of the acoustic pressures and flows in these cavities, through the study ofnatural frequencies and mode shapes in each case. There is a good agreement of the results obtained by the FiniteElement Method in comparison with the analytical solutions obtained by the Transfer Matrix Method. Thus, thestudy of the behavior of acoustic cavities interconnected by different methods, in addition to enabling the validationof this simple analytical formulation, allows the preliminary treatment of the problem, for the fluid-structureapproach, which is a more complex issue and dependent on these analyzes. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5682 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5682/4751

oai:publicacoes.softaliza.com.br:article/5683 2024-06-24T21:17:47Z cilamce2021:ART

Structural Analyses of Fixed Offshore Wind Turbine Jacket-Type Support Structure Érica M. de Mendonça Gabriel Nogueira Gilberto B. Ellwanger José R. M. de Sousa Offshore Wind turbine Jacket-Type Support Structure Ultimate limit state Fatigue limit state This work aims to study a steel jacket supporting a 10 MW offshore wind turbine (OWT) in a 40 mwater depth on the Northeastern Brazilian Coast. In order to do so, various structural analyses were carried out.First, the system’s natural frequencies were evaluated, and stresses caused by local environmental loads of wind,waves, and currents were assessed. GeniE was responsible for calculating the utilization ratio of the jacket’selements under extreme loads. The jacket foundations, composed of piles on sandy soil, were also analyzed in GeniE, highlighting the representation of soil-foundation interaction and the soil load capacity according to API-RP-2A-WSD. SIMA-RIFLEX performed fatigue analysis through the Rainflow Counting method associated with an S-N curve to assess fatigue damage, which is pivotal for the project. Different wind turbulence intensities wereinvestigated as this factor proved to influence the structure’s lifetime greatly. A final adjustment was made to thejacket cross-section, after the analyses, in order to guarantee its structural integrity. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5683 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5683/4752

oai:publicacoes.softaliza.com.br:article/5684 2024-06-24T21:17:47Z cilamce2021:ART

Design of a Floating Offshore Structure by a Deep Neural Network Fillipe R. L. Esteves Bernardo L. R. Andrade Kazuo Nishimoto Deep Neural Networks Offshore Design Forced Mass-Spring-Damper System Hydrodynamic Model Semi-submersible The design process of an offshore system requires a suitable dynamic model of the floating structure, accord-ing to the geometry and environmental conditions. However, the choice of the hydrodynamic model is directly associated with the computational cost since dozens of simulations are necessary during the design process. Inthis work, the assessment of different parameters allowed to accelerate the design analysis model applying DeepNeural Networks instead of the hydrodynamic model. A two-phase study assessed the main parameter’s calibrationto the Deep Neural Network (DNN), with a forced 1 DoF Mass-Springer-Damper (MSD) system and a validatedhydrodynamic model for heave motions of a semi-submersible platform. The use of simplified models in this studyallowed a large volume of cases to compose the dataset. Systematically varying the number of layers in the DNNand the number of neurons in each layer, the authors selected the combination with the minimum mean squarederror. The response surface provided by the best network configuration provides a response surface that is usefulfor optimization tasks of future works. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5684 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5684/4753

oai:publicacoes.softaliza.com.br:article/5686 2024-06-24T21:17:47Z cilamce2021:ART

Study of the parametric excitation phenomenon of a slender riser using finite element method and a reduced order model Guilherme Rocha Martins Paulo Akira Figuti Enabe Rodrigo Provasi Alfredo Gay Neto Parametric excitation finite element method reduced order model Mathieu’s instability In the context of oil and gas (O&G) exploitation, risers are slender structures connecting the floatingunit to the seabed. These structures experience static and dynamic loads with potentially high nonlinearities. It isrelevant for O&G industry to understand the riser’s mechanical behavior to improve the structure life and predictfailures. In this sense, this work focuses on the analysis of the dynamical behavior of a vertical riser (representedas a vertical beam) under harmonic excitation in the top, standing for the oscillation of a floating unit. Dependingon the structure’s mechanical properties and on the load frequency, the parametric excitation phenomenon cantake place, yielding large-amplitude lateral motion even for small vertical displacements. More specifically, thefocus is on the Mathieu’s instability regions, which occurs when the excitation frequency is an even multiple ofthe structure natural frequency. In this work, we establish a simplified analytical approach using a reduced ordermodel (ROM), which considers an Euler-Bernoulli beam model undergoing small rotation. For this purpose, theequations of motion are obtained using the extended Hamilton’s principle (EHP). By applying Galerkin’s methodusing three sinusoidal shape functions and considering a time-spatial split, ROM’s non-dimensional final equationscan be obtained. Next, an in-house nonlinear FEM-based solver, called Giraffe (an acronym for “Generic InterfaceReadily Accessible For Finite Element”) is presented and some comparative examples are performed using theROM and the Giraffe, observing their differences and similarities. These case studies were performed consideringthe structure immersed in water and air, and the excitation frequency is varied to evaluate the first and the secondMathieu’s instability region. The results presented good agreement in both models, with, in general, slightly largerdisplacements for the ROM models. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5686 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5686/4754

oai:publicacoes.softaliza.com.br:article/5687 2024-06-24T21:17:47Z cilamce2021:ART

An IBEM-FEM model of the Rayleigh wave-scattering function of long walls David A. S. Carneiro Josue Labaki Persio L. A. Barros Heavy Surface Structures Rayleigh Waves Ground Vibration Attenuation Boundary Element Method This work presents a numerical method to investigate the ground vibration screening capability of long walls and how their presence affects the wave propagation in the soil. Incident Rayleigh waves imping-ing on the wall are considered as seismic excitation. The soil is modeled as a two-dimensional, homogeneous, transversely isotropic, viscoelastic half-space modeled through an indirect formulation of the Boundary ElementMethod (IBEM), discretized by constant boundary elements. The method consists of a superposition of Green’s functions for uniformly distributed surface loads. The wall is discretized by linear-elastic, four-noded, isoparamet-ric, quadrilateral finite elements. This coupling results in an IBEM-FEM model in which traction and displacement fields within the half-space containing the wall subjected to Rayleigh waves are related through sets of contact tractions applied to the boundary elements. Post-processing from these tractions yields quantities such as the dis-placement and strain fields within the half-space, which are used to study how the presence of the wall affects the ground vibration generated by Rayleigh waves. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5687 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5687/4755

oai:publicacoes.softaliza.com.br:article/5688 2024-06-24T21:17:47Z cilamce2021:ART

A 3D IBEM-FEM coupling model for time-harmonic soil-structure inter- action analysis I. Cavalcante J. Labaki Boundary Element Method Coupled methods Soil-structure interaction This work presents a numerical model for the analysis of arbitrarily-shaped 3D structures, under time-harmonic loading, supported by the soil surface. The structure is modeled with the finite element method, and the soil is modeled by the indirect boundary element method. The present formulation uses superposition of Green’sfunctions for loads distributed over rectangular areas to obtain stress and displacement fields anywhere in thesoil. The use of a boundary element-based formulation makes this model capable of representing accurately wavepropagation in the soil and of complying with Sommerfeld’s radiation condition, and avoids truncation problemsand computational cost issues that would result from different methods. Coupling between the elements of thestructure and of the soil is established by imposing equilibrium and continuity conditions at their interface. Thisresults in an equation of motion of the soil-structure system, written in terms of nodal displacements and forces ofthe structure, and involving the effect of soil flexibility. A representative example of a tower interacting with thesoil is analyzed. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5688 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5688/4756

oai:publicacoes.softaliza.com.br:article/5689 2024-06-24T21:17:47Z cilamce2021:ART

Numerical integration method for very high frequencies in the evaluation of Green’s functions for layered media: transient wave propagation phenomena I. Cavalcante J. Labaki Numerical integration Green’s function Very high frequency Countor deformation path Extrapolation methods of integration This paper is the sequel of a numerical scheme prepared for numerical integration of improper integrals,containing an infinite number of singularities and a decaying tail that oscillates indefinitely. This kind of integralsis common in many engineering unbounded media problems that involve computing Green’s functions, whichare usually solved with transformed integrals approaches. This work considers the Green’s function for case ofthe time-harmonic response of a multilayered transversely isotropic half-space under external excitations. Thisresponse is obtained with the aid the Hankel transform and presented in terms of an exact stiffness matrix method.The solution, in the Hankel transformed domain, was integrated numerically to obtain the corresponding physicaldomain displacements for very high frequencies. The Fast Fourier Transform (FFT) algorithm was employed inthe previously synthesized frequency domain solutions, which results in the determination of transient responsesfor very small time-steps. The results show that three wave fronts are generated. The displacement velocity ofthese wave fronts can be associated to compression, shear and Rayleigh waves. This work contributes to ourunderstanding of the numerical evaluation of time-harmonic and transient responses of soil media and is importantin many fields of geotechnical engineering and other unbounded media problems. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5689 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5689/4757

oai:publicacoes.softaliza.com.br:article/5690 2024-06-24T21:17:47Z cilamce2021:ART

Non-singular Green’s functions for quadratic-order indirect-BEM discretizations: implementation and numerical results Iago Cavalcante Edivaldo Romanini Josue Labaki Euclides Mesquita Boundary Elements Method Green’s functions Fourier transforms Numerical integration This article presents original Green’s functions that can used to model bounded and unbounded prob-lems through boundary discretization and meshless methods. Time-harmonic loads are applied within rectangular patches within isotropic, three-dimensional full-spaces. The coupled differential equations describing the problemare solved with the aid of double Fourier transforms. A boundary-value problem corresponding to horizontal andvertical loads with bi-quadratic distribution over the loaded area is considered. The final stress and displacementfields are expressed in terms of double Fourier integrals to be evaluated numerically. These non-singular Green’sfunctions can be thought of as bi-quadratic boundary elements, to be used within direct and indirect boundaryelement formulations. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5690 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5690/4758

oai:publicacoes.softaliza.com.br:article/5691 2024-06-24T21:17:47Z cilamce2021:ART

IBEM-FEM model of the vibratory response of a buried, elastic strip footing Aldemar P. Siqueira Persio L. A. Barros Josue Labaki Boundary elements soil-structure interaction coupled methods This work investigates the dynamic response of an elastic, partially buried strip footing under verticaland horizontal external time-harmonic loads. The footing is modeled as a two-dimensional embedded rectanglediscretized by a plane-strain isoparametric finite element. The soil is a two-dimensional, isotropic, viscoelastichalf-space modeled through an Indirect-Boundary Element formulation. Solutions for this medium are obtainedby superposition of Green’s functions for buried loads. Direct kinematic compatibility and equilibrium conditionsare used to couple the finite element mesh to the boundary element mesh, assuming perfectly bonded contact atthe foundation-soil interface. The effect of foundation embedment and elastic properties on the dynamic behaviorof the foundation is illustrated with selected numerical examples. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5691 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5691/4759

oai:publicacoes.softaliza.com.br:article/5692 2024-06-24T21:17:47Z cilamce2021:ART

Computation of moments in quadratic discontinuous anisotropic plane elasticity fast multipole formulation J. S. França L. S. Campos A. B. Dias Jr. D. D. C. Matheus E. L. Albuquerque anisotropic plane elasticity fast multipole method boundary element method quadratic discontinuous elements The fast multipole formulation is used in order to solve large scale problems in general boundary el-ement formulation. In this work we will present the computation of moments in the anisotropic plane elasticity fast multipole formulation with quadratic discontinuous elements. Fundamental solutions of plane elasticity arerepresented by complex functions from the classical 2D elasticity theory. The Multipole Expansion for kernels U(displacement field) and T (traction field) will be computed using series. The convergence of the series expansionto the fundamental solutions is analyzed considering different numbers of series terms and different distance fromsource point to field point. Moments are computed to evaluate integrals of influence matrices where elements arefar away from the source point, whereas the conventional approach will be applied to evaluate the integrals on theremaining elements that are closer to the source point. All fast multipole operations are demonstrated in this workand compared to the standard boundary element formulation. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5692 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5692/4760

oai:publicacoes.softaliza.com.br:article/5693 2024-06-24T21:17:47Z cilamce2021:ART

On the MFS for potential problems in non-homogeneous media Edmundo Guimaraes de Araújo Costa Marlucio Barbosa Jose Antonio Fontes Santiago Jose Claudio de Faria Telles MFS Green’s functions non-homogeneous media This paper presents a simple formulation based on Method of Fundamental Solutions (MFS) for thenumerical solution of non-homogeneous potential problems. This formulation makes use of Green’s functions fordealing with the non-homogeneity of the problems. These Green’s functions are here modified by the method ofimages, aiming decreasing the number of surfaces discretized by the MFS and thus reducing the computationalcost of the proposed models. The MFS formulation is then evaluated for different Green’s functions by comparingits results with the ones given by analytical solutions. Finally, an example is presented, illustrating the goodperformance of the MFS for such problems with embedded boundary conditions. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5693 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5693/4761

oai:publicacoes.softaliza.com.br:article/5694 2024-06-24T21:17:47Z cilamce2021:ART

Comparison of two open-source codes of the boundary element method for acoustic problems Fernando Barreto Soares Alvaro Campos Ferreira Eder Lima de Albuquerque Boundary element method Acoustics A comparison between two competing free and open-source codes of the boundary element method(BEM) for internal and external acoustic problems is carried out in this work. The BEM programs used wereBempp-cl and BB. While Bempp-cl is an well established Python program developed at University College Londonand the University of Cambridge, BB is a more recent code, developed at the University of Bras ́ılia, written in Julialanguage. For the mesh generation, an also open-source program, Gmsh, was used. Initially, internal problems ona cubic geometry were solved, both in terms of response analysis in the resonant frequencies as well as frequencyresponse analysis for the three first modes of the problem. For the same problem, a processing time analysis wasalso conducted, in order to assess the efficiency of the mentioned programs. The solutions obtained by the twoprograms were compared with each other as well as with analytical solutions, when available. The results for thecubic geometry shown that both programs were able to successfully predict the behavior for the modes and forthe frequency analysis, with a satisfactory time consuming. Therefore, the use of BEM and, specially, of bothprograms studied in this article are very powerful tools, freely available, to solve large and complex engineeringproblems, with great efficiency and accuracy. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5694 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5694/4762

oai:publicacoes.softaliza.com.br:article/5695 2024-06-24T21:17:47Z cilamce2021:ART

Performance Comparison between the Multiple Reciprocity and Direct Interpolation Boundary Element Method in Problems Governed by the Helmholtz Equation Balista, T.G Loeffler, C.F Lara, L.O.C Boundary Element Method Radial Functions Fundamental Higher-Order Solutions Helmholtz Equation. In this work, response problems applied and governed by the Helmholtz equation are analyzed. Theformulation Multiple Reciprocity Boundary Element Method (MRBEM) can be seen as an extension of theformulation with Dual Reciprocity (DRBEM) because the original problem as a whole is modeled by a sequenceof fundamental solutions of a higher-order, while the formulation of the DRBEM uses a sequence of radial-basedfunctions to approximate the kernel the domain integrals. Although both techniques apply the reciprocitytheorem, the idea behind each method is essentially different. For the validation of this formulation, problemsgoverned by the Helmholtz equation are solved, in which the MRBEM results were compared to a newformulation of the Boundary Element Method (BEM), denoted in this work as DIBEM-2 (Direct InterpolationBoundary Element Method without Regularization). DIBEM-2 makes use of radial basis functions toapproximate domain integrals. Performance curves are generated by calculating the average percentage error foreach mesh, demonstrating the convergence and precision of each method. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5695 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5695/4763

oai:publicacoes.softaliza.com.br:article/5696 2024-06-24T21:17:47Z cilamce2021:ART

Analysis of centrifugal body force problems in anisotropic materials using the boundary element method Leonardo B. Silva Eder L. Albuquerque Lucas S. Campos Boundary Element Method Anisotropic Materials Centrifugal Loads The main objective of this work is the development of a formulation of boundary elements for theanisotropic material problem evaluation under centrifugal loads. The fundamental anisotropic solutions are usedand terms of inertia are considered as body forces. The domain integrals that result from the inertial terms aretransformed into boundary integrals using the radial integration method. As a result, no internal points are neededto improve the accuracy of the solution. Discontinuous quadratic boundary elements are used whose degrees offreedom are written in a local reference system, where the directions of the coordinate axes coincide with thenormal and tangent directions to the boundary at the collocation point. Problems with known analytical solutionsare used in order to assess the accuracy of the proposed formulation. There is a good agreement between thenumerical and exact solutions. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5696 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5696/4764

oai:publicacoes.softaliza.com.br:article/5697 2024-06-24T21:17:47Z cilamce2021:ART

Secondary torsion moment deformation effect (STMDE) by Boundary Element Method in composite bars with variable cross sections Maicon José Hillesheim Francisco Célio de Araújo Secondary torsion moment deformation effect generic composite bars subregioning technique preconditioned iterative solvers This paper proposes a formulation for solving torsion problems in composite bars with variable cross sections including secondary torsion moment deformation effect (STMDE). The Boundary Element Subregion-by-Subregion (BE-SBS) Technique is applied to model cross sections with general shape and constituted of any number of different materials. Four boundary value problems are solved. The primary and secondary warpingfunctions are determined by applying the Boundary Element Method, while the primary and secondary twistangles, θ pand θs, along the element axis are solved by a process based on the weighted residual method. It isworth mentioning that iterative Krylov’s solvers are used, which results in saving memory and solver time. Theefficiency, robustness and accuracy of the implemented algorithm are demonstrated in several numericalexamples. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5697 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5697/4765

oai:publicacoes.softaliza.com.br:article/5698 2024-06-24T21:17:47Z cilamce2021:ART

A Comparison Between Cell-less Formulations for Domain Integrals Treat- ment in the Poisson type problem by the Boundary Element Method Lucas de Paulo de Souza Rodrigo Guerra Peixoto Boundary Element Method Dual Reciprocity Method Multiple Reciprocity Method Radial Integration Method Direct Integration Method By applying the Boundary Element Method (BEM) to solve Poisson problems, besides boundary in-tegrals, the final equation also contains a domain integral involving the inhomogeneous term. This integral can be evaluated by discretizing the domain into cells. However, one of the main advantages of the BEM, which isthe reduction of the problem’s dimension by one order, is lost and several methods have been developed aimingto treat these integrals without the need to do this discretization. This paper makes a comparison among threeformulations to do this: the Dual Reciprocity Method (DRM), the Multiple Reciprocity Method (MRM) and theRadial Integration Method (RIM). The formulations and features of each method are presented as well as numericresults obtained by their applications to some examples with known analytical solutions. The aim of this paper isto make a critical analysis in terms of the numeric efficiency and accuracy of each technique, primarily about thenumber of elements and internal points required for obtaining results inside an acceptable margin of error. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5698 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5698/4766

oai:publicacoes.softaliza.com.br:article/5699 2024-06-24T21:17:47Z cilamce2021:ART

An isogeometric Boundary Element formulation for solids containing trimmed surfaces Matheus Rocha Edson D. Leonel Isogeometric analysis Boundary Element Method Three-dimensional modelling Trimmed analysis The Isogeometric Boundary Element Method (IGABEM) is an accurate and recent approach for solvingboundary value problems. This approach is especially accurate in the representation of complex geometries andmechanical responses. Besides, it enables the direct application over Computer Aided Design (CAD) models, oncethey utilise same basis functions in the parametrization of geometric entities. In the context of elasticity problems, the Non-Uniform Rational B-Splines (NURBS) functions approximate both geometry and mechanical fields. Ad-ditionally, CAD models often represent complex solids with trimmed NURBS surfaces. The generation of these type of surfaces rely on the trimming operation, in which NURBS curves represent the edges of a cut. Conse-quently, a robust IGABEM analysis must account for trimmed surfaces, which is a challenging task nowadays. Hence, the present research deals with the mechanical analysis within IGABEM and trimmed geometries. For thispurpose, an identification task based on the ray-casting algorithm detects regions and control points unaffected bytrimming operation, trimmed or inactivated. Afterwards, the collocation points in surfaces’ corners are moved intothe surface, which follows the modified Greville Abscissae (GA) strategy. Besides, the integration process appliesthe transformations proposed by Kim et al (2009). The proposed formulation applies a non-singular strategy, whichavoids additional singularities’ treatment. One application demonstrates the accuracy of the proposed formulation,in which the responses have been compared against analytical solutions. A new extension of mechanical analysiswithin IGABEM has been reached herein, once trimmed surfaces are also incorporated in this numerical method. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5699 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5699/4767

oai:publicacoes.softaliza.com.br:article/5700 2024-06-24T21:17:47Z cilamce2021:ART

Three-dimensional failure analysis by BEM using cells with embedded discontinuity activated during the nonlinear loading process Alisson P. Chaves Rodrigo G. Peixoto Ramon P. Silva Boundary Element Method Three-dimensional Nonlinear Analysis Embedded Discontinuity Numerical simulation of brittle fracture of three-dimensional solids is addressed in this work by theboundary element method (BEM) and the strong discontinuity approach (SDA). In this formulation, cracks aretreated using a non-geometric representation through the use of cells with embedded discontinuity. Into these cells,the inelastic strain field is obtained as a result of the application of kinematic equations with discontinuities in thedisplacement field (strong discontinuities) to standard continuum constitutive models, containing a softening law.A reinterpretation of some parameters of the constitutive model is also performed to guarantee its compatibility tothe discontinuous kinematics. Since in the BEM only the internal regions where dissipative effects happen needto be discretized into cells, crack propagation is driven by activations of such cells during the loading process,followed by an expansion of the matrices that define the discrete model. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5700 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5700/4768

oai:publicacoes.softaliza.com.br:article/5701 2024-06-24T21:17:47Z cilamce2021:ART

Application of the Direct Interpolation Boundary Element Technique with Self-Adaptative Integration to Bidimensional Diffusive-Advective Problems Loeffler, C.F. Santos, A.J. Pinheiro, V.P. Melo, L.D.V. Boundary Element Method Direct Interpolation Technique Diffusive-Advective Model Self-Adaptative Integration Scheme The application of the Boundary Element Method (BEM) in the formulation of advective-diffusive modelsexperiences a solid scientific revival and finds its main challenges in the numerical treatment of the transport term.Despite the classic formulation, which is based on the fundamental solution related to the problem, being ableto adequately describe physical situations dominated by advection, it does not present flexibility when dealingwith variable velocity fields. The recent Direct Interpolation technique (DIBEM), also based on the robustnessof approximations by radial basis, handles in a more balanced way the challenges imposed to BEM, while ableto represent hydrodynamic fields with spatial variation and maintaining numerical stability up to moderate Pecletnumbers. Basically, the technique procedure transforms domain integrals into boundary integrals, approachingthe entire kernel using radial basis functions. The DIBEM’s mathematical structure is very similar to a classicinterpolation, that in turn requires a significant number of interpolating points in the domain. In this context,the performance of the Direct Integration formulation as well as it is numerical stability depend, among otherfactors, on the quality of the approximation of ordinary, quasi-singular and singular integrals that are inherent tothe discrete linear system. The current article proposes a comparison and analysis of the influence of the numericalintegration scheme selection, testing the classic Gaussian quadrature against a self-adaptive scheme, aiming toevaluate possible accuracy gains of the Direct Interpolation Technique. Quantitative assessment of the impacts ofintegration schemes are evaluated using well-known analytical solutions. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5701 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5701/4769

oai:publicacoes.softaliza.com.br:article/5702 2024-06-24T21:17:47Z cilamce2021:ART

Analytical and adaptive numerical evaluation of all terms required in a 3D boundary element implementations for potential problems using linear triangle elements Ney Augusto Dumont Tatiana Galvao Kurz Collocation boundary element method Numerical integration Analytical integration 3D Problems The present contribution introduces a formulation for 3D steady-state potential and elastostatics prob-lems that ends up with the analytical handling of all integrals necessary in an implementation using linear triangle (T3) elements – whether regular, improper, quasi-singular, singular or hypersingular integrals are involved. Theboundary element matrices – including the discontinuous term of the double-layer potential matrix – are obtainedin a straightforward way with the use of analytically pre-evaluated integrals. Results at internal points that maybe located arbitrarily close to the boundary are also given analytically. The paper describes the main concepts andcomputational features of the proposed formulation and presents an example of 3D potential problem to illustratethe most challenging topological configurations one might deal with in practical applications. For source pointssufficiently far from a boundary element an adaptive numerical integration scheme is also proposed for the sake ofcomputational speed – and how far a point should be in order to be considered far is also discussed. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5702 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5702/4770

oai:publicacoes.softaliza.com.br:article/5703 2024-06-24T21:17:47Z cilamce2021:ART

Direct Transient Response of Coupled Structures-Soil Systems Modelled by Matrix Methods and Green’s Functions Approach Amauri C. Ferraz Euclides Mesquita Luis F. V. Lima Josué Labaki Dynamic Soil-Structure Interaction Transient Response Modal Analysis Even today it is still a big computational challenge to obtain the dynamic transient response of complexsystems constituted of a structure interacting with a foundation supported by the soil. The most common numericalsolution schemes for the two sub-systems, the structure and the soil-foundation support are distinct. Usually, thefoundation dynamics is modelled by the Finite Element Method (FEM) or related matrix methods. On the otherhand, the soil dynamics has been best solved using either the direct or indirect version of the Boundary Element Method (BEM). A coupling of both numerical schemes is the most versatile scheme to solve Dynamic Soil-Structure Interaction (DSSI) problems. The coupling of the methods to obtain transient solutions is still computationally very demanding. I this work we propose an alternative approach. For subsystem 1, the structure, modal quantities are obtained in coordinate relative to the structure base displacement. For sub-system 2, the soil-foundation scheme, the BEM is applied to obtain frequency domain solution of foundations resting on soils or on piles. A coupling of the structure with foundations in the frequency domain delivers modified Frequency ResponseFunctions (FRFs). New or modified modal quantities are now extracted from the FRFs that already include theinfluence of the soil-foundation dynamics on the structure. These extracted modal quantities may be used tointegrate directly the equations of motion in the time domain. All degrees of freedom of the soil-foundation systemare incorporated in the modified modal quantities, which retain the number of degrees of freedom of the originalstructure. The numerical examples will address the transient response of structures resting foundation schemecomposed of a homogeneous half-space and a pile embedded in the half-space. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5703 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5703/4771

oai:publicacoes.softaliza.com.br:article/5704 2024-06-24T21:17:47Z cilamce2021:ART

Machine-precision fracture mechanics evaluations with the consistent boundary element method Ney Augusto Dumont Osmar Alexandre do Amaral Neto Boundary elements fracture mechanics machine-precision integration As hitherto proposed in the technical literature, the boundary element modeling of cracks is best carriedout resorting to a hypersingular fundamental solution – in the frame of either the so-called dual formulation or thedisplacement discontinuity approach –, since with Kelvin’s fundamental solution it would not be possible to dealwith the ensuing numerical and topological issues. A more natural approach would be the direct representationof the crack tip singularity in terms of generalized Westergaard stress functions, as already proposed in the frameof the hybrid boundary element method. Quite recently, we have been able to demonstrate that the conventionalboundary element formulation is in fact able to precisely represent high-stress gradients and deal with extremelyconvoluted topologies provided only that the problem’s integrals be properly evaluated, which has turned outto be the case. The reference literature on the present subject is briefly outlined along with the paper, whichincludes the simplest scheme of evaluating stress intensity factors in terms of crack tip opening displacementsas a viable alternative to the J-integral. We propose that independently of configuration a cracked structure begeometrically represented as it would appear in real-world laboratory experiments, with crack openings in the rangeof micrometers or even nanometers, which would still be mathematically feasible – albeit not mechanically. Infact, machine precision evaluation of all quantities may be always achieved and stress results consistently obtainedat interior points arbitrarily close to crack tips. The present developments apply to two-dimensional problems.Some numerical illustrations show that highly accurate results are obtained for cracks represented with just a fewquadratic, generally curved, boundary elements – and a few Gauss-Legendre integration points per element. Wealso investigate how different simulations of the crack tip shape affect results, which turn out to be more accuratewith the use of higher-order, such as quartic, boundary elements. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5704 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5704/4772

oai:publicacoes.softaliza.com.br:article/5705 2024-06-24T21:17:47Z cilamce2021:ART

Boundary element analysis of 3D linear potential problems combining fast multipole expansion and machine-precision numerical integration Ney Augusto Dumont Hilton Marques Souza Santana Fast multipole Collocation boundary element method 3D Potential problems Numerical integration Analytical integration This paper is part of a research work to implement, test, and apply a novel numerical tool that can simu-late on a personal computer and in just a few minutes a problem of potential or elasticity with up to tens of millions of degrees of freedom. The authors have already developed their own version of the fast multipole method (FMM)for two-dimensional problems, which relies on a consistent construction of the single-layer potential matrix of thecollocation boundary element method (BEM) so that ultimately only polynomial terms (as for the double-layerpotential matrix) are required to be integrated along generally curved segments related to a given field expansionpole. The core of the present paper is the mathematical assessment of the double expansions needed in the 3DFMM. The 3D implementation is combined with a particular formulation for linear triangle elements in which allintegrations for adjacent source point and boundary element are carried out analytically. As a result, numericalapproximations are due exclusively to the FMM series truncations. This allows isolating and testing truncationerrors incurred in the series expansions – and thus for the first time properly assessing the mathematical featuresof the FMM, as illustrated by means of an example. The complete solution of a mixed boundary problem using aGMRES solver, for instance, is just an additional task and, although already implemented, is not reported herein. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5705 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5705/4773

oai:publicacoes.softaliza.com.br:article/5706 2024-06-24T21:17:47Z cilamce2021:ART

An Isogeometric Boundary Element Formulation for fibre-reinforced 3D domains Antonio R. Neto Edson D. Leonel 3D IGABEM Reinforced materials Coupling formulation This study presents an innovative Isogeometric coupling formulation for the mechanical analysis of3D solids reinforced by fibres. This formulation is based on the coupling of the Isogeometric Boundary ElementMethod (IGABEM) and the 1D approach of the Boundary Element Method (1DBEM). The material matrix (solid3D domain) is modelled by the IGABEM, which uses NURBS and B-Splines functions to represent both geometryand mechanical fields. These functions allow the exact representation of complex geometries, such as cylinders,torus and propellers. Besides, a straightforward connection with the geometry design is possible, since mostCAD packages used in engineering projects represent 3D solids through NURBS surfaces at its contours. The1DBEM is based on the axial fundamental solution for elastic 1D domains. The interaction between the matrixand fibres is described by an adherence force over the reinforcements’ line, which is interpolated by high-order polynomial functions. No relative displacements is considered (perfect bonding) and both materials have linear-elastic behaviour. The proposed coupling formulation is herein named 1DBEM/IGABEM coupling technique. The mechanical analysis of a numerical application demonstrates the results obtained by the proposed formulation incomparison with reference results. The proposed formulation requires fewer degrees of freedom than the referencefor the same level of accuracy. Therefore, the Isogeometric coupling presented herein is not only effective for alarge number of complex geometries, but also efficient in the precise representation of mechanical fields. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5706 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5706/4774

oai:publicacoes.softaliza.com.br:article/5707 2024-06-24T21:17:47Z cilamce2021:ART

Consistent boundary element method for crack propagation problems Guilherme O. Rabelo Luiz C. Wrobel Ney A. Dumont Consistent boundary element method fracture mechanics crack propagation This paper presents the development of a crack propagation code to be implemented in a computerprogram based on the consistent boundary element method. This method has as its main characteristic an exactresolution of singularity problems inherent to the formulation. Furthermore, with this method, it is possible torepresent the crack geometry of the models with openings in the micrometer range, similar to the cracks presentedin laboratory tests. In this study, two models with different geometries are analyzed, using the same load, in orderto represent pure mode I and mixed mode (modes I and II) loading configurations. The performance of this methodis compared with the results of other papers found in the literature. As a crack propagation criterion, the maximumstress in the proximity of the crack tip and the stress intensity factor obtained through the crack tip openingdisplacement are analyzed. A study was also carried out on the propagation angle and crack stability, aiming atimproving the accuracy of the model results and reducing the computational cost of the simulations. The studypresented in this article is a work in progress. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5707 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5707/4775

oai:publicacoes.softaliza.com.br:article/5708 2024-06-24T21:17:47Z cilamce2021:ART

An improvement to the frequency response in non-homogeneous Helmholtz problem using the Double Fictitious Background Media Formulation Markcilei Lima Dan Webe João Mansur Carlos Friedrich Loeffler Boundary Element Method Helmholtz Equation Inhomogeneous media This article proposes a new formulation of the Boundary Elements Method to solve the responseproblem in non-homogeneous Helmholtz problems, called Double Fictitious Background Media (DFBMF). TheDFBMF is based on a simple algebraic procedure, creating a fictitious medium, which consists of adding andsubtracting the same term in the governing equation, which divides it into two parts: a homogeneous Helmholtzequation and a fictitious reactive term. This new governing differential equation is mathematically independent ofthe properties of the chosen fictional background medium. Still, considering the Weighted Residual Principles, theassociated integral boundary equation is affected by the Green Function argument through the reactive term, whichaccounts for the variation in physical properties. To reduce the numerical error, two integral equations withdifferent arguments are generated where the reactive term is considered a common source to the two equations.The numerical simulations show a significant increase in the precision of the results with the application of thisstrategy. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5708 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5708/4776

oai:publicacoes.softaliza.com.br:article/5709 2024-06-24T21:17:47Z cilamce2021:ART

Recalculation of internal directional derivatives using the integral equation of the Boundary Element Method in Poisson problems previously solved by the Finite Element Method H. M. Barcelos C. F. Loeffler L. O. C. Lara Boundary Element Method Recursive Scheme Poisson’s Problems Finite Element Method Radial Basis Functions The strategy of reusing the integral equation of the Boundary Element Method (BEM) to improve theaccuracy of the values of variables previously calculated on the boundary have showed consistency, addressingscalar problems governed by the Laplace, Poisson, and Navier equations. In this work, the boundary nodalvalues obtained with the application of the Finite Element Method (FEM) in Poisson problems are substituted inthe BEM integral equation for the calculation of the internal values of potential and its derivative. For theexample showed, the results obtained were compared with the values found by the FEM and BEM, both in theirclassic form, and the performance was evaluated through the analytical results. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5709 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5709/4777

oai:publicacoes.softaliza.com.br:article/5710 2024-06-24T21:17:47Z cilamce2021:ART

Anomalous diffusion equation modeled by the joint use of domain boundary element method and analytical derived solution based on green equation W. J. Mansur J. A. M. Carrer K.K.S.Saito O.C.Rotunno Filho Anomalous Diffusion Equation bimodal mass transmission Domain Boundary Element Method analytical Green Function linear cells and backward finite difference scheme In some situations, the mathematical formulation of the diffusion phenomenon might be describedthrough a differential equation, which takes into account complementary and different effects with respect to thephysical processes simulated with the support of the Fick ́s equation, which is usually adopted to represent thediffusion process. In particular, diffusion applied to spatial-temporal retention problems with bimodal masstransmission is highlighted. To better understand this physical phenomenon, the proper use of the analyticalGreen function (GF) was investigated. The formulation employs the steady-state fundamental solution. Inaddition to the basic integral equation, another one is required, due to the fourth-order differential operatorintroduced in the differential equation of the problem evaluated. The domain discretization employs linear cells.The first order time derivative is approximated by a backward finite difference scheme. Two examples arepresented. Numerical results are compared with analytical solutions showing good agreement between them;such framework provides a novel perspective for the use of the combined approach here developed to assess thebehavior of physical phenomena better described by the fourth order analytical equation based on GreenFunction. In this work, the Domain Boundary Element Method (D-BEM) is explored to model that anomalousdiffusion process taking into consideration that we were also able to originally develop the Green analyticalsolutions for the fourth order diffusion equation. Such combination of approaches proves to establish a newconceptual reference in this area. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5710 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5710/4778

oai:publicacoes.softaliza.com.br:article/5711 2024-06-24T21:17:47Z cilamce2021:ART

Analysis of the use of carbon fiber reinforced polymer bars to reinforce concrete beams Rodrigo S. Baptista Luiz C. Wrobel Reinforced Concrete Structure Carbon fiber reinforced polymer bar Nonlinear structural analysis Atena software The aim of the present work is to analyze the use of bars made of composite material to act asreinforcement for concrete beams subjected to bending. The analyzed bars are constituted by polymer reinforcedwith carbon fibers (CFRP), a material that presents linear elastic behavior until rupture. This material has someadvantages in relation to steel, such as considerably higher tensile strength in addition to not being susceptible tocorrosion caused by environmental conditions. During the development of the work, an article was obtained whichdemonstrates results of laboratory tests in which the authors used concrete beams subjected to four-point flexuretesting and reinforced with PRFC bars. In this work, the same test was simulated using the Atena software, acomputer program that performs non-linear analysis for concrete structures, considering the structural cracking.The results obtained by the software were consistent with those obtained in the laboratory. The flexuralreinforcement design was performed for a section of concrete beam reinforced with steel and another with CFRP,in addition to having also analyzed a uniformly distributed load that breaks a continuous beam when it is reinforcedwith steel bars and when it is reinforced with CFRP bars. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5711 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5711/4779

oai:publicacoes.softaliza.com.br:article/5712 2024-06-24T21:17:47Z cilamce2021:ART

Composite shell formulations: comparison of two geometrically nonlinear implementations Isadora T. Almeida Celso J. Faccio Junior Alfredo Gay Neto Sergio F. M. Almeida composite shells CLT nonlinear shell formulation Composite materials are attractive candidates for structural applications that require high specific-strength and high specific-stiffness. Laminated composite materials are extensively used in aeronautical, aerospace, and lately wind energy industries, where weight-sensitive structures are abundant. The structural modeling oflaminates commonly employs the Classical Lamination Theory (CLT). It is an extension of the homogeneous platetheory introducing the elastic coupling effects present in laminates. In the CLT, the laminate stacking sequenceand material properties of each layer generate a homogenized section. Also, these structures are often slender andmay present large displacements and finite rotations, so that the adoption of a geometrically nonlinear shell modelis appropriate. This work presents the extension of a fully geometrically nonlinear triangular shell finite elementto account for laminated composite materials. The constitutive relations are derived from a quadratic potentialbased on the CLT, considering small strains. The method was implemented in the Giraffe solver, accounting fortransverse shear and an additional drilling stiffness parameter. Calibration of the drilling stiffness was performed bycomparing static results from ANSYS® software, as a reference. Modal analysis was also addressed, for the samecomposite proposals. Numerical results showed good agreement between Giraffe and ANSYS® implementations. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5712 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5712/4780

oai:publicacoes.softaliza.com.br:article/5713 2024-06-24T21:17:47Z cilamce2021:ART

Development and Characterization of Green Composites for Social Housing Natália Victoria dos Santos Daniel Carlos Taissum Cardoso Glauco José de Oliveira Rodrigues Composite Materials Biocomposites Vegetable fibers Civil construction is one of the sectors of society that cause the most environmental impacts. The highconsumption of natural resources, emission of carbon dioxide in the manufacture of industrialized materials,changes in soil, worsening of heat islands, waste production and water consumption. Therefore, the search forsustainable materials is gaining more prominence. Thus, a solution found is the use of composites reinforced withvegetable fibers and biodegradable matrix, called biocomposites. In addition to their sustainable character,vegetable fibers are low specific weight, abundance, low cost, and non-toxicity. The present research aims todevelop and characterize 100% vegetable composites, using jute fiber fabric embedded in a liquid castor-basedpolyurethane matrix for application as wall and roof elements of social housing. These plates, in turn, are producedby the compression molding process, where layers of fabric and matrix are interspersed and compressed. Thespecimens produced with 40% fiber were tested under bending according to the ASTM D790 standards to checkmechanical properties. The specimens were made in three directions (0°, 45° and 90°) to analyze the differencesin response in each case. As a result, for the main direction the flexural strength reached 37.2 MPa, while thelowest result occurred in the 45° direction with a resistance of 16.9 MPa. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5713 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5713/4781

oai:publicacoes.softaliza.com.br:article/5714 2024-06-24T21:17:47Z cilamce2021:ART

Flexural behavior of concrete beams reinforced with BFRP bars – experimental and numerical analysis Gean M. B. Warmling Roberto D. Machado Ricardo Pieralisi Mauro L. Santos Filho BFRP beams numerical model fracture energy crack orientation This study focuses on numerical and experimental analysis of reinforced beams with Basalt FiberReinforce Polymer (BFRP) bars used as longitudinal and transversal reinforcements. The main characteristics ofBFRP are a linear stress-strain relationship and the elasticity modulus which is lower than the conventional steelbars. Numerical analysis is conducted by carrying out nonlinear tridimensional FE models in the software DIANATNO to study load-deflection curves of beams with BFRP as longitudinal and transversal reinforcement. In aninitial analysis are established the more suitable mesh size and load step. Then, a parametric analysis considers theuse of different values for compressive fracture energy and crack orientation. All the results are compared withexperiments. From the obtained results, it is possible to conclude that the numerical models were capable of predictload-displacement curve for beams with BFRP reinforcement. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5714 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5714/4782

oai:publicacoes.softaliza.com.br:article/5715 2024-06-24T21:17:47Z cilamce2021:ART

Mechanical behavior of strain hardening cementitious composites (SHCC) for structural repair Matheus P. Tinoco Flávio A. Silva SHCC Hybrid Fibers High ductility Structural Repair This article presents an experimental investigation on the mechanical behavior of Strain HardeningCementitious Composites (SHCC) reinforced with PVA, UHMWPE (ultra-high molecular weight polyethylene),steel and hybrid fibers for structural repair. The total volume of fibers were kept constant at 2.0% in order tomaintain the workability of the composite system. PVA and UHMWPE fibers were partially replaced by steelfibers in 0.5% and 1.0%. The mechanical response was measured under tension tests while crack formation wasinvestigated using a high-resolution image capturing procedure. The results have shown that PVA fibers have abetter performance than UHWMPE and steel fibers for normal strength matrices. It was also found that the partialreplacement of PE fibers by steel fibers has the benefit of increasing the strength, but it has the disadvantage ofreducing the strain capacity of the composite. Finally, the composites were used as structural repair in beamssubjected to previous damage, and the results verify the feasibility of SHCC as a repair material. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5715 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5715/4783

oai:publicacoes.softaliza.com.br:article/5716 2024-06-24T21:17:47Z cilamce2021:ART

Theoretical study of short and long-term behavior in hollow core concrete slabs prestressed with FRP tendons Pablo M. Páez Gus Fiber reinforced polymers Hollow core slabs Long-term Serviceability Prestressed concrete The aim of this work is to assess the suitability of the use of fiber-reinforced polymer (FRP) tendons in simply supported, prestressed, hollow core slabs without concrete topping, with respect to their short and long-term behavior under service load conditions. In this research, the use of carbon fiber reinforced polymer (CFRP) and aramid fiber reinforced polymer (AFRP) tendons are examined. In the first part of this paper, we present aframework for the short and long-term analysis of prestressed, concrete, hollow core slabs with FRP tendons inthe cracked and uncracked states. Then, based on a theoretical study, we compare the behavior of fully and partiallyprestressed, hollow core slabs with either FRP tendons or steel tendons. Our main conclusions are that hollow core slabs which have been prestressed with either CFRP or ARFP tendons show lower prestress losses and lower long-term deflections in the uncracked state and for the same initial prestressing stress levels Although insignificant differences were observed in the cracked state, the main advantage lies in better use of both materials (concreteand FRP tendons), as these can give better performance than prestressing with steel tendons. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5716 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5716/4784

oai:publicacoes.softaliza.com.br:article/5717 2024-06-24T21:17:47Z cilamce2021:ART

Overall effective elastic properties of composites by computational homogenization Wanderson F. dos Santos Ayrton R. Ferreira Sergio P. B. Proença Composite materials Computational homogenization Overall effective elastic properties Uniform strain boundary condition Periodic boundary condition In composite materials the combination of different constituents promotes heterogeneity and specificproperties. Therefore, the constitutive behavior of a composite can be complex. In this context, the present work explores a computational homogenization procedure to predict the overall or macroscopic effective elastic proper-ties accounting for characteristics of the constituents at microscale. The microstructure of the material is modeled using the concept of Representative Volume Element (RVE). Both uniform strain or periodic boundary condition are applied on the RVE to compare the results. The effective elastic properties are then obtained from homoge-nization of the microscopic fields computed with three-dimensional numerical simulations by finite elements. The macroscopic constitutive properties obtained numerically are then compared to available results. The results showa strong influence of the boundary condition on the effective elastic properties. On the other hand, the inclusionmorphology has no significant influence on the results. Furthermore, the procedure hereby described is an effectivetool to the more realistic modeling of the macroscopic constitutive behavior of composites materials. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5717 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5717/4785

oai:publicacoes.softaliza.com.br:article/5718 2024-06-24T21:17:47Z cilamce2021:ART

MAGNETIC ORIENTATION OF SISAL AND STEEL FIBERS IN CEMENTITIOUS MATRICES: EXPERIENCES OF SÃO JUDAS TADEU UNIVERSITY RAMBO, Dimas A.S. MARTINI, Sandro FREITAS, Marcos F.M BRITO, Igor S. SALVADOR, Renan P. Guilherme H.N. magnetic alignment fiber orientation mechanical behavior electrical properties This work presents results of experimental investigations focused on the magnetic orientation of steeland sisal fibers embedded in cementitious matrices. The work addresses the development of magnetic alignmentmethodologies and their influence on the mechanical and electrical properties of the resulting cementitiouscomposites. In the first phase, the materials used in the research are presented, as well as two methods formagnetic alignment of fibers: neodymium magnets coupled to a computer-controlled industrial robot and asimplified magnetic circuit using a pair of coils wrapped in a ferromagnetic core. The second phase focuses onthe analysis of the electrical and mechanical properties of the composites and assessment of the fiber orientationand positioning. X-ray computed tomography, electrical resistivity and bending tests were used in this phase.The results showed that the projected magnetic systems were able to generate a preferential orientation of thefibers, increasing the overall mechanical performance of the composites and generating anisotropy on theirelectrical properties. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5718 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5718/4786

oai:publicacoes.softaliza.com.br:article/5719 2024-06-24T21:17:47Z cilamce2021:ART

Stability Analysis of Carbon/Epoxy Plate with the use of Finite Elements Method Helio de Assis Pegado Bruna Mara Alves da Silva buckling static stability composite laminate The Laminated plates subjected to in-plane compressive loads are studied in this research, taking into account laminate different configurations and boundary conditions. The critical buckling load for these configura-tions is calculated using a commercial Finite Elements Program. The mesh convergence is tested, and the 60x60 mesh is chosen because their results are very close to the classical references, and the time of execution is lowerthan sixty seconds. The Finite Element Program is performed and the results obtained show a good agreementwith the literature, which demonstrate the validity of the model adopted. The critical buckling load and its modeare evaluated, and the influence of several boundary conditions and the fiber directions are studied. The resultsobtained are discussed, and the influence of the different design parameters of the laminate on static stability isverified. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5719 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5719/4787

oai:publicacoes.softaliza.com.br:article/5720 2024-06-24T21:17:47Z cilamce2021:ART

STRUCTURAL ANALYSIS OF A MICROSATELLITE LAUNCHER VEHICLE SUBMITTED TO EXTERNAL PRESSURE Robert R. A. Oliveira Giovani L. Zabot Maikson L. P. Tonatto Composites Fairing Finite element method MLV Structural analysis The Brazilian Space Program has advanced in the development and production of microsatellite launchvehicle (MLV) aiming at having self-sufficiency in sending satellites into space. Even though, the scientificliterature is scarce of works that present detailed results on this type of launcher vehicle. Therefore, this workpresents a structural analysis of a microsatellite launcher vehicle fairing manufactured by composite using a finiteelement (FE) model. The FE model was submitted to external pressure obtained from two-dimensional fluiddynamics simulations. A linear buckling simulation was performed to obtain the collapse pressure of the fairingand to determine the thickness of the composite laminates. Then, a non-linear static simulation was performed toobtain the progressive failure of the laminates using Hashin’s criterion. Tree different stacking sequence wereanalyzed: [± 28 / 0 / 0]s , [90 / ± 554 / 90] and [± 655]. The failure to the structure was obtained by mapping thepressure curve with the estimated thicknesses. Regarding the results, it was seen that the first buckling mode occursbefore the material failure in all the stacking sequence conditions. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5720 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5720/4788

oai:publicacoes.softaliza.com.br:article/5721 2024-06-24T21:17:47Z cilamce2021:ART

Flexural response of polypropylene fiber reinforced concrete using the fiber composite model Luís Felipe Ribeiro Marcello Congro Cristian Mejia Deane Roehl Fiber-reinforced concrete Damage Fiber composite model Numerical modeling In the last decades, several laboratory tests have been carried out to investigate the mechanicalbehavior of fiber-reinforced concrete (FRC), especially regarding their flexural response for several structuralapplications in Engineering. Modern developments concerning these materials have improved the number ofnumerical models capable of predicting mechanisms at the material scale and the load-displacement behavior ofthe composite. Therefore, the preliminary stages of advanced cement material design can profit frommathematical models since the numerical experiments can consider different material working conditions beforeprototyping. This paper proposes the numerical modeling of polypropylene fiber reinforced concrete beamsusing a mesoscale formulation called the fiber composite model. This model consists of the coupling of uniaxialfiber finite elements with continuum cementitious elements through cinematic constraint equations, where thefiber degrees of freedom are eliminated at the element level. Additionally, a cohesive zone with a continuum damage behavior is inserted into the formulation to simulate the post-cracking material flexural response. Three-point bending experimental tests reported in the literature are modeled. The results show good agreement between the experimental references and the reinforced cohesive element model to predict fracture patterns forFRC beams. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5721 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5721/4789

oai:publicacoes.softaliza.com.br:article/5722 2024-06-24T21:17:47Z cilamce2021:ART

Comparison of the response of reinforced concrete structures modeled in mesoscale for different damage models Welington H. Vieira Rodrigo R. Paccola Humberto B. Coda Damage models Mesoscale concrete Embedded particles The continuous damage mechanics allows the construction of constitutive models that represent well thebehavior of concrete structures. In this work, a computational code is developed, using the positional approach ofthe Finite Element Method (FEM), which allows to represent the concrete degradation using two different damagemodels. In the first, the degradation is distributed in the elements that discretize the concrete. In the second, thedamage model is applied to interface elements and makes it possible to represent discrete cracks in the structure.The objective is to compare the performance of these models by applying them to the same structure to verify theproximity of the force-displacement curves and cracking patterns. Where do we seek to define the best for eachtype of use. The concrete is represented in mesoscale, where the finite element meshes that represent the coarseaggregates and the mortar are generated independently and are superimposed to form the composite material. Thedamage models were applied to a reinforced concrete beam and it was found that the model applied to interfaceelements represents the cracks better, but the computational cost is higher. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5722 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5722/4790

oai:publicacoes.softaliza.com.br:article/5723 2024-06-24T21:17:47Z cilamce2021:ART

Experimental Study of Polyvinyl Alcohol (PVA) Fiber Reinforced Concrete under Cyclic Loading Felipe Rodrigues de Souza Victor Nogueira de Lima Daniel Carlos Taissum Cardoso Flávio de Andrade Silva fiber reinforced concrete cyclic loadings PVA fibers Fiber reinforced concrete (FRC) elements are widely used in applications subjected to cyclic loadingssuch as pavements, wind towers and tunnel-linings. The FRC improves the behavior of structures subjected tothese loadings by controlling the crack opening and the damage propagation and thus can withstands thousands ormillions of cycles during their service life. The purpose of this work is to evaluate the mechanical behavior ofconcrete reinforced with PVA fibers comparing to polypropylene fibers, quantifying the damage and thedevelopment of cracks under three point bending cyclic and quasi-static tests. The quasi-static tests results indicatethat the addition of PVA fibers increases ductility and toughness, as it is already known for polypropylene macrofibers. Moreover, for the cyclic tests, the fibers contribute to the stiffness maintenance reducing the damage in thematerial and consequently reducing the crack width and propagation. Finally, when comparing the PVA-FRC withthe polypropylene fiber reinforced concrete (PP-FRC), it was found that the PVA sample presented lower damageduring the cycles and therefore resulting in a smaller CMOD variation. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5723 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5723/4791

oai:publicacoes.softaliza.com.br:article/5724 2024-06-24T21:17:47Z cilamce2021:ART

Mechanical behavior of sandwich panels with curauá fiber reinforced composite skins and autoclaved aerated concrete core Isabela de Paula Salgado Flávio de Andrade Silva sandwich panels autoclaved aerated concrete cementitious composites natural fibers flexural strength A curauá fiber-reinforced aerated concrete sandwich panel was developed as a sustainable, lightweight,and low-cost alternative construction material. Each composite skin consisted of long unidirectional aligned curauáfibers, applied by a cast hand layup technique, and a cementitious matrix with 50% of Portland cement replacementby pozzolanic materials. The mechanical properties of the sandwich panels and their components wereinvestigated. The skins displayed a strain-hardening response and multiple cracking behavior. Strength,deformation capacity, and cracking mechanisms of the composite laminates are presented. The sandwich panels'monotonic and cyclic four-point bending responses were evaluated. The bonding between the composite layersand the autoclaved aerated concrete (AAC) core was assessed through pull-off tests and microscopic imaging. Theresults revealed the efficiency of the cementitious layers in providing a more ductile behavior and a higher flexuralstrength to the material. The ductility properties of the AAC core were improved when assisted by the skin layersin the sandwich structure. A deflection-softening behavior and a satisfactory post-peak ductility were observed inthe cyclic bending tests. Failure mechanisms, strength, and toughness are reported. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5724 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5724/4792

oai:publicacoes.softaliza.com.br:article/5725 2024-06-24T21:17:47Z cilamce2021:ART

Effect of permanent forms of cementitious composites with short sisal fiber on the shear of reinforced concrete beams ROCHA, M. J. M. A. LEITE, D. D. LIMA, P. R. L. permanent forms short sisal fiber reinforced concrete beams Traditional form systems for reinforced concrete structures, produced in steel and wood, have somedeficiencies from the point of view of cost, environment and management. The use of permanent form systemsfor beams, produced with cementitious composites reinforced with short sisal fibers, can bring improvements tothe production process and influence the mechanical behavior of the beam when they are subjected to shearefforts. In this work an experimental investigation of the influence of the permanent forms is made when thereinforced concrete beam is subjected to shear forces. 8 beams were produced, 2 of them for control and 6 beamswith permanent form. Such forms were produced with 3 composites with short sisal fibers in different levels anddifferent water/binder ratios. The beams were tested by bending at 3 points with asymmetric load and part of thebeam was produced without stirrups in order to more easily verify the influence of the form. It was observed thatthe use of the forms brings improvements in the mechanical behavior, with slightly higher maximum loads,higher energy absorbed and a lower level of opening in the cracks caused by the shear. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5725 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5725/4793

oai:publicacoes.softaliza.com.br:article/5726 2024-06-24T21:17:47Z cilamce2021:ART

Dynamic analysis of a composite material telecommunications tower under wind loads João Paulo D. de S. Pereira Eliane Maria L. Carvalho Wendell D. Varela Janine D. Vieira Pultruded composite Telecommunications towers Structural dynamics Dynamic wind action Vibration attenuators This work aims to analyze a glass fiber reinforced polymer (GFRP) telecommunications tower underwind dynamic loads. The natural frequencies of the structure’s first lateral bending modes in both planes, obtainedfrom a numerical model using the Finite Element Method, were less than 1 Hz. According to the Brazilian standardNBR 6123, with those values, a dynamic analysis of the structure under wind fluctuation is necessary. A Pythonlanguage program was developed in order to simulate the fluctuation of the wind and solve the dynamicequilibrium equations. With the time domain analysis of the tower, large displacements at the top of the towerwere identified. To solve this problem, a nonlinear pendulum control system adjusted to the natural frequency ofthe structure for both planes was designed. The coupled equations of motion of the structure and the controllerattached to its top were also implemented in the Python program, obtaining the controlled and uncontrolledstructure responses. For a set of random simulations of wind conditions, the efficiency of the nonlinear pendulumcontrol system in reducing displacements amplitudes in the two planes of the structure was assessed. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5726 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5726/4794

oai:publicacoes.softaliza.com.br:article/5727 2024-06-24T21:17:47Z cilamce2021:ART

Development of an optimized moment-connection joint for pultruded profiles Jessé Henrique Nascimento Beserra Daniel Carlos Taissum Cardoso Jorge Lopes Santos pultruded composite connection optimized The present work aims the development of a novel optimized beam-column moment connection forpultruded profiles that is characterized by an efficient shape able to transfer load between members due to contactand friction. To accomplish this task, the work will be divided in two major stages: i) stress analysis via finiteelement model; and ii) topology optimization. In the former step, a reference joint geometry will be pre-designedand stress trajectories are obtained for a given load using software Abaqus. Then, the joint shape is optimizedusing a topology optimization technique available in the software package. During the study, stresses are evaluatedand the behavior of both optimized and original joints are compared in the elastic range. This work is part of anongoing investigation on the development of novel 3D-printed solutions for joints. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5727 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5727/4795

oai:publicacoes.softaliza.com.br:article/5728 2024-06-24T21:17:47Z cilamce2021:ART

A Numerical Parametric Study on the Effectiveness of Fastener Delamination Arrest Mechanism in Composite Laminates Under Mode I Loading Rodolfo F. V. de Melo Maur ́ıcio V. Donadon Amauri Gavazzi Bolted joints Delamination Arrestment Finite Elements Cohesive Zone Models By using the Cohesive Zone Model approach and 3D solid elements to model the fastener fixationand specimen, this study aims to provide high fidelity numerical models for a double-cantilever-beam specimenconfiguration to investigate the effectiveness of fasteners as arrest mechanism for interface crack growth underpure mode I loading. Additionally, a parametric study was also performed to investigate the influence of jointdesign parameters on the specimen behavior for this loading case. Numerical results have demonstrated that asingle-fastener is sufficient to completely arrest mode I delamination growth until other failure modes take place,independent of the joint design parameters. Despite this, fastener diameter, preload and type of fit have shown someinfluence in arrest efficiency, while adding friction penalty to the model appears to have had no significant effectunder mode I loading. As a part of a more complete study for different loading cases, these results represent anincremental contribution focused on the development of design methods and tools for damage tolerant compositeaerostructures. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5728 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5728/4796

oai:publicacoes.softaliza.com.br:article/5729 2024-06-24T21:17:47Z cilamce2021:ART

An algorithm for distribution of short fibers in multiscale numerical analysis Andre Peres da Silva Luís Antonio Guimarães Bitencourt Jr finite element method multiscale model SFRC fiber distribution segregation Nowadays, it is widely known that the behavior of Steel Fiber Reinforced Concrete (SFRC), especiallythe failure process is highly influenced by the distribution of the fibers. For this reason, recently, many numericalmodels with a discrete and explicit representation of steel fiber have been proposed in order to consider the effectof the fiber distribution. In this context, this work presents an algorithm for the distribution of short fibers inmultiscale numerical analyses. Some features and capabilities of the algorithm are assessed through the numericalanalyses of some beams under distinct degrees of fiber segregations. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5729 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5729/4797

oai:publicacoes.softaliza.com.br:article/5730 2024-06-24T21:17:47Z cilamce2021:ART

Experimental analysis of asphalt-concrete composite beams subjected to four point bending test Vianna, N.J. Ruiz, A.N. whitetopping concrete overlay steel fiber reinforced concrete For thin and ultrathin whitetopping, the bond between the uppermost layer and the lower one has beenpointed out crucial for a proper performance. However, the adherence is gradually lost along time due tomechanical loads and environmental conditions. Fiber reinforced concrete is an effective solution and improvesthe general performance of the structure. This work proposed a four-point bending test for composite beams inorder to investigate the initiation and propagation of cracking at the interface between layers, thus evaluating themechanical behavior in a mixed mode failure (combination of shear and normal stresses). It was tested, in staticconditions, two types of overlays (plain concrete and steel fiber reinforced concrete) applied over an asphaltconcrete layer. The experimental results obtained for both concrete overlays were compared. An analysis ofvariance was performed to find out if there was no variation between both experiments. It was found that theaddition of fibers did not enhanced the resistance of the composite, however it allowed the material to withstandgreater deformations and not failing abruptly during the test. Therefore, the addition of fibers to the cementitiousmatrix has proved to be beneficial to the overall performance of the structure. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5730 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5730/4798

oai:publicacoes.softaliza.com.br:article/5731 2024-06-24T21:17:47Z cilamce2021:ART

Wave propagation analyses considering an enhanced fully adaptive explicit time-marching formulation Lucas Ruffo Pinto Delfim Soares Jr. Webe João Mansur Time-marching Explicit analysis Adaptive parameters This work presents an enhanced explicit time-marching formulation to analyse hyperbolic models,which is based on locally-defined adaptive time-integrators and time-step values. The discussed technique considers single-step displacement/velocity recurrence relations, providing an easy to implement, truly self-starting methodology. The stability limit of the approach is twice that of the central difference method, and it allows adaptive controllable numerical dissipation to be applied, improving the accuracy and versatility of themethod. As an explicit approach, the technique does not require the solution of any system of equations, standingas a very efficient methodology. Subdomain decomposition procedures, associated to multiple time-step valuesand sub-cycling, are also considered, improving the performance and accuracy of the technique. The entireformulation is carried out taking into account automated, self-adjustable computations, requiring no effort and/orexpertise from the user. At the end of the paper, numerical results are presented and compared to those of standardtechniques, illustrating the great effectiveness of the discussed approach. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5731 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5731/4799

oai:publicacoes.softaliza.com.br:article/5732 2024-06-24T21:17:47Z cilamce2021:ART

Approximation of the acoustic and elastic wave equations by generalized finite difference stencils applied the unstructured grids. Juliano D. B. Santos Abimael F. D. Loula Geraldo J. B. dos Santos Unstructured meshes Finite difference Wave equation Classical finite difference methodologies, obtained through Taylor series expansions of the functions,are feasible only when the points are distributed on structured or Cartesian grids defined over rectangular domains or mapped to rectangles. In this paper we present a technique capable of generating approximations for the two-dimensional acoustic and elastic wave equations on structured and unstructured meshes over more general domains. The stencils were calculated at each point of the arbitrary grid by interpolation techniques and the results shownthat the order of accuracy, obtained when the structured grid is used, is maintain to case unstructured and minimumnumber of points of the stencils. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5732 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5732/4800

oai:publicacoes.softaliza.com.br:article/5733 2024-06-24T21:17:47Z cilamce2021:ART

Characterization of gold mine tailings variability and its influence in the study of drainage conditions in the CPTu test Letícia Perini Natália Ziesmann Gracieli Dienstmann cavity expansion finite element Monte Carlo The effect of drainage conditions on piezocone test (CPTu) measurements is a critical factor in theassessment of mine tailings properties, as the material is in the intermediate permeability range. Studies of drainageconditions have been carried out by identifying a characteristic drainage curve. However, accurately identifyingthe range of drainage variation is a challenge due to high variability of the material. In this sense, this paperprovides tools to assist the understanding of the effects of data dispersion over the definition of a drainagecharacteristic curve. A reference analysis is presented herein in where a characteristic profile of a CPTu test ingold tailings is used to quantify the statistics and its application. A numerical analysis of cavity expansion is usedto obtain theoretical drainage curves. The variability characterized was applied to the numerical simulations, usingthe Monte Carlo method, to define in a rational way the range of possible theoretical drainage curves. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5733 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5733/4801

oai:publicacoes.softaliza.com.br:article/5734 2024-06-24T21:17:47Z cilamce2021:ART

Energy exchange between piled structures through the soil Amanda M. Oliveira Josue Labaki Dynamic soil-structure interaction piled structures energy exchange geotechnics This work presents a study on the energy transfer between piled structures. For this analysis, twostructures, supported by buried pile groups, interact with each other through the soil. A stationary external load isapplied to one of the structures, and its effect is felt by the other structure solely through the energy transmittedthrough the soil. The soil is modeled as a three-dimensional halfspace, and the piles through the impedance matrixmethod. The structure is modeled via classical finite element discretizations, which enables arbitrarily-shapedstructures to be considered. Coupling between the two systems is obtained by imposing continuity and equilibriumconditions at their interface. Selected results are shown for different geometric parameters of the piled structures. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5734 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5734/4802

oai:publicacoes.softaliza.com.br:article/5735 2024-06-24T21:17:47Z cilamce2021:ART

Vibratory response of a wind tower considering soil-structure interaction Amanda M. Oliveira Josue Labaki Wind turbine Dynamic soil-structure interaction Piled structures This work presents a model of the vibratory response of a wind tower structure supported by an embed-ded pile group, considering the soil-pile-structure interaction. The model for the pile group is obtained using the impedance matrix method. The soil is considered as an isotropic, viscoelastic, three-dimensional half-space, theresponse of which is obtained through a boundary element discretization of the pile-soil contact tractions. Pilesare modeled as one-dimensional finite beam elements. Coupling between the systems is achieved by establishingequilibrium and continuity conditions at the soil-pile and pile-structure interfaces. The results consider arbitraryharmonic loads applied to the structure in terms of nodal equivalents. This analysis show that disregarding theinfluence of the pile group in the model of the tower may incur in considerable misrepresentation of the tower’sdynamic response. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5735 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5735/4803

oai:publicacoes.softaliza.com.br:article/5736 2024-06-24T21:17:47Z cilamce2021:ART

Use of ML techniques for predicting the bearing capacity of piles and its relative errors Yago F. Gomes Dimas B. Ribeiro Standard penetration test Pile capacity Machine learning This work presents an application of machine learning techniques for estimating the bearing capacity of pilefoundations and the relative error from these techniques. It uses as raw data 165 load tests results associatedwith SPT soundings, taken from several Brazilian regions. A dataset based on the inputs from Decourt-Quaresmaand Meyerhof semi-empirical methods was created and applied to several machine learning techniques with aleave-one-out cross validation approach for training and testing the algorithms. Using the results obtained fromeach model, the metrics RMSE and R2 were calculated through a stacking strategy. The Random Forest techniquepresented the best performance for both bearing capacity (RMSE = 640,26) and relative error (R2 = 0.77) predictionproblems. The other five ML techniques performance overcame the semi-empirical methods, which obtained anRMSE close to 900, indicating the potential of these tools. Then, the errors obtained from the predictions wereused to propose a new machine learning problem, aiming to predict the error of new examples. Although thepreliminary results were not accurate, the authors believe that the study justifies further investigations. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5736 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5736/4804

oai:publicacoes.softaliza.com.br:article/5737 2024-06-24T21:17:47Z cilamce2021:ART

NUMERICAL INVESTIGATION OF GEOSYNTHETIC REINFORCED SOIL MASS WITH BLOCK FACING AND CLOSELY-SPACED REINFORCEMENTS Bianca A. Vieira Carina M. L. Costa Yuri D. J. Costa Silvia C. J. Fernandes Ellen F. S. Azevedo Geosynthetic Reinforced Soil Vertical Spacing Lateral Displacement Settlements Deformations Bridge Abutment Bridge abutments using geosynthetic reinforced soil (GRS) for direct supporting of the deck is a solutionwith significant advantages over conventional systems. Among the main characteristics of this type of structure,the small reinforcement spacing, frequently lower than 0.3 m, requires attention. This paper provides aninvestigation to assess the effect of closely-spaced reinforcements on the behavior of a GRS mass using blockfacing, and subjected to a uniformly distributed loading with typical value of service conditions. The Plaxis 2Dfinite element software was used to conduct a parametric study to investigate the influence of vertical spacing (Sv)and reinforcement stiffness (J). The numerical investigations were developed according to different approaches toanalyze the effect of vertical spacing. Initially, combinations of Sv and J were adopted without considering aconstant J/Sv ratio and then the J/Sv ratio was kept constant. The results indicated a significant effect of verticalspacing for both approaches. The maximum lateral displacements of the facing and soil settlements near facingwere found to decrease. This behavior was obtained for all the values adopted for the constant J/Sv ratio. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5737 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5737/4805

oai:publicacoes.softaliza.com.br:article/5738 2024-06-24T21:17:47Z cilamce2021:ART

Performance analysis of an embankment over a soft soil deposit through instrumentation and numerical simulation Rafael F. Cordeiro Miryan Y. Sakamoto Gracieli Dienstmann soft soil back analysis finite element The present paper describes the performance analysis of an embankment over a soft soil deposit. Theembankment is part of the duplication of the Brazilian Federal highway, BR 470, a major infrastructure projectthat crosses several soft clay deposits in the State of Santa Catarina, Brazil. To increase stability the referencesection was reinforcement with geogrids, equilibrium berms, and stage constructions of the landfill (slowconstruction) was specified combined with preloading and pre-fabricated vertical drains (PVDs) to accelerateconsolidation. The performance during field construction was mainly evaluated through instrumentationconsidering the evolution of horizontal displacements and the stabilization of settlements. Given the limitations ofthe methods used for control during the construction process, and a discrepancy between field settlements andoriginal project predictions, soil profile and geotechnical parameters were revaluated during construction, and usedin a revised performance analysis. The revised performance analysis was done in finite element software PLAXIS,using Mohr Coulomb and Soft Soil Models. Some important considerations were observed when proceeding thisback analysis that could have been used to modify the construction process during execution. Additionally, toanalyze the effects of the inherit variability, a sensibility analysis to determine levels of possible settlements andtime of consolidation was performed. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5738 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5738/4806

oai:publicacoes.softaliza.com.br:article/5740 2024-06-24T21:17:47Z cilamce2021:ART

ANALYSIS OF ARAQUARI SAND BEHAVIOR THOUGHT NUMERICAL MODELING OF TRIAXIAL TESTS Kauê William Pacheco Bruna Carvalho Matheus Luccas Menoncin Pacheco Geraldo Caetano de Almeida Neto Naloan Coutinho Sampa Gracieli Dienstmann Araquari Sand Plaxis Finite Elements Triaxial Test The present paper describes the numerical evaluation of triaxial tests to assess the constitutive model ofbetter adaptation to a set of laboratory data. The data considered is part of an experimental campaign carried out onsamples of sandy composition, from the Araquari/SC experimental testing site. To model the triaxial data, anaxisymmetric representation of the triaxial specimen was designed in the finite element software Plaxis. Applicationsof the Mohr Coulomb (MC) and the Hardening Soil Model (HS) were evaluated by a direct comparison betweenlaboratory results and numerical predictions. Considering different confining pressures, both models were able topredict with good accuracy the maximum bearing load. The greatest discrepancy was observed in the prediction ofstrain behavior: as expected, the hardening soil model was more adequate to represent the non-linear behavior of thesand. As the main scope of the research developed at the Araquari Experimental Testing Site is the investigation ofthe complex pile-soil interaction mechanisms, after the analysis of the constitutive model that better represents thetriaxial tests, the hardening model was used to predict the behavior of a reference pile. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5740 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5740/4807

oai:publicacoes.softaliza.com.br:article/5741 2024-06-24T21:17:47Z cilamce2021:ART

Analise limite numérica de problemas axissimétricos em geotecnia: aplicação em estabilidade de poços David Sebastian Calpa Raquel Quadros Velloso Eur ́ıpedes A. Vargas Jr. Fabricio Fernandez Analise Limite Numérica Programação cônica Axissimetria Poço Mohr-Coulomb Drucker-Prager This work presents the implementation of numerical limit analysis with mixed-weak formulation, based on the lower bound limit theorem and its application in axisymmetric stability problems. The finite element formu-lation was implemented in Matlab, where the optimization problem was established in two parts, the definition of equilibrium equation and the adaptation of the Drucker-Prager and Mohr-Coulomb rupture criteria into the SecondOrder Cone and Semidefined Programming, respectively. The numerical optimization problem was solved usingthe MOSEK optimizer, the collapse factor and the velocities field was obtained, identifying the rupture mechanismof the models. The presented implementation was applied to the stability analysis of a well. The results obtainedin the axissymmetric analysis were verified through analysis in three-dimensional models and compared with theresults obtained in the software Plaxis 2D, and Optum G2. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-13 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5741 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5741/4808

oai:publicacoes.softaliza.com.br:article/5742 2024-06-24T21:17:47Z cilamce2021:ART

Numerical modeling of triaxial tests on salt rocks using a creep law with damage-induced flow Otavio B. A. Rodrigues Catarina N. A. Fernandes William W. M. Lira Salt rocks Creep Damage This work performs a numerical modeling of triaxial tests on salt rocks, using the MultimechanismDeformation Coupled Fracture (MDCF) creep law and the software ABAQUS. In the design of wellbores drilledon salt rocks for oil and gas exploration, computational modeling of creep is important for stability. Constitutivemodels describe the salt behavior and are calibrated by laboratory triaxial tests. Brazilian salt rocks are usuallymodelled using the double mechanism deformation, which is a good fit to several experimental tests. Yet, one ofits limitations is to describe only the steady-state stage. In the literature, some more complex models representsalt creep, such as MDCF, which reproduces full creep stages and evolution of damage from the confining anddeviatoric stress. The damage mechanism influences the creep strain rate, especially under low confining stresses.To achieve the proposed aim, the methodology adopted is divided into three main steps: i) numerical simulationof triaxial tests using ABAQUS; ii) customization of ABAQUS to incorporate the MDCF; iii) validation of theincorporation by comparisons with results available in the literature. The results show adequate responses for themodeled triaxial tests under several conditions. The main contribution of this work is its use as a startup step forthe incorporation of the MDCF creep law in the modelling and verification of oil wellbore drilled on salt rocksstability. XLII Ibero-Latin American Congress on Computational Methods in Engineering 2024-06-13 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artigo avaliado pelos Pares application/pdf https://publicacoes.softaliza.com.br/cilamce2021/article/view/5742 XLII Ibero-Latin American Congress on Computational Methods in Engineering; v. 3 n. 03 (2021): CILAMCE 2021 por https://publicacoes.softaliza.com.br/cilamce2021/article/view/5742/4809 eb342c66e4b2fbcfd9dbc505bb572ca6