Estudo de modelos teóricos e numéricos de vigas I de aço de alma esbelta com enrijecedores longitudinais

Abstract

Slender web beams are structural steel elements used in bridges, viaducts or industrial buildings, subjected to a combined bending and shearing forces that generates loss of stability in the web, with the need of transverse and longitudinal stiffeners. The purpose of this work was to define how to analyze and design those elements, based on analytical and numerical models using the finite element method. The analytical methods were developed using standard EN 1993-1-5 (2006) which includes two forms for the verification of load capacity: the reduced stress method and the effective width method by AASHTO (2014), which is equivalent to NBR 8800 (ABNT, 2008). The numerical modeling, was performed by the finite element method, according to the indications of EN 1993-1-5 (2006), performing a linear and non-linear buckling analysis considering the geometric imperfections. The analytical methods present lower results when compared to numerical methods, there is a need to improve the methods proposed by the standards, and finally showing that the longitudinal stiffener improves thestability if the web.