Análise numérica comparativa da flambagem lateral com torção em vigas de aço de seção I empregando elementos finitos de casca e elementos sólidos tipo casca

Abstract

Lateral torsional buckling (LTB) is a critical phenomenon in the structural behavior of steel beams, directly impacting the stability and safety of buildings. This work is dedicated to a numerical analysis of this phenomenon, using ANSYS software to model and simulate the behavior of steel beams of I profile. In this context, the objective is to compare the results obtained with modeling considering two types of finite elements: shell elements and solid shell elements. Modeling with shell elements employs surface finite elements to represent the beam, while solid shell elements offer a three-dimensional and more detailed description. Numerical models were developed to simulate the performance of beams under vertical loads, with the objective of evaluating the displacement curves on the Y and Z axes and the collapse load. The validation of the models was performed by comparing the results obtained with experimental data. Despite the similar behavior in convergence, the shell element SHELL181 presented better performance, with more concise results and with the advantage of requiring a lower computational cost when compared to the use of the SOLSH190 solid shell finite element in the analyzed models.