Estudo numérico da flambagem local na mesa em perfis de alma senoidal submetidos à compressão axial

Abstract

This work evaluated the relative performance of sinusoidal web profiles through the numerical study of flange local buckling (FLB) for simple bars under compressive strength, when compared to flat web profiles. For this study, two models were discretized using the Finite Element Method (FEM) through the ABAQUS® program. The numerical methodology was based on Buckle analysis, maintaining the values of table width, web thickness and web height for each profile and gradually changing the thickness of the flanges, this way was possible to reach several results of critical tension for each slenderness, being defined the curve of the elastic phase. From the numerical results obtained it was possible to perform the analytical parameterization with the norm ABNT NBR8800:2008 and to make a proposition of calculation for the parameters of slenderness that limit each buckling modes of the flanges. Considering these results, comparisons were made between the performance of the sinusoidal web profiles and those from the flat web profiles. The numerical results showed that the performance of a sinusoidal web profile can be up to 8% more efficient than flat soul profiles, regarding the possibility of collapse of the structure without the occurrence of FLB when subjected under compressive strength.