Análise não linear de perfil tubular quadrado submetido a forças axiais de compressão

Abstract

Considering the wide use of steel structural elements in the composition of several structures, this article aims to evaluate the behavior of the square tubular profile when subjected to axial compression forces, by tracing the ultimate resistance curves of the bar and comparing the numerical values with those obtained from the ABNT NBR 8800:2008, ABNT NBR 16239:2013, ANSI/AISC 360-16 and EN1993-1-1:2005 standards. In the numerical analysis, the Abaqus software was used, varying the bar length in order to make a complete analysis about its global stability. Some important aspects for the numerical analysis were evaluated, such as the mesh sensitivity, geometric nonlinearity, elastic-plastic behavior material and behavioral bar coherence in the cases studied. No residual stresses were introduced in the analyses. The outcomes from numerical modeling showed good agreement with the normative values and allowed to observe how the different parameters interfere in the structural behavior.