ANÁLISE DAS CURVAS DE FLAMBAGEM DISTORCIOANAL DE VIGAS DE AÇO EM PERFIL FORMADO À FRIO VIA MRD E GBTUL

Resumo

Due to the wide variety of transverse shapes as well as their good mass / strength ratio, cold
formed steel (CFS) components are gaining prominence among metal structures. However, this material
is more susceptible to local, distorted and global buckling. The Direct Strength Method (DSM) requires
obtaining the full limb buckling critical loads and applying these data in conjunction with a series of
resistance curves to determine the final cross section strength. This study aims to investigate the behavior
of different buckling modes for a supported single beam CFS, and to compare the results obtained
through DSM and GBTUL (program responsible for numerical computational analysis). To obtain the
data, the Finite Element Method (FEM) was used, which, in turn, uses the geometries and flow stresses
to be studied in this work, as well as the understanding of the influence that the bending moment diagram

has on the behavior. buckling and post buckling. For this analysis, a cold-formed, non-drilled, multi-
dimension steel member design was chosen. From the analyzes presented in this paper it was noticed

that the distortive curves available in the Brazilian standard underestimate the final strength of the bars
simply supported by cold formed steel members when subjected to uniform bending.