Effect of Slenderness Ratio on Inelastic Buckling and Residual Strength of H-Section Steel Column Member

Abstract

This study presents the effect of slenderness ratio on inelastic buckling behavior and residual strength of H-section steel column member under axial compression loading. Both end pinned H-section steel column constraining rotation on the weak and strong axis was studied. When column members subjected to unexpected compression load (other than design load) will buckle if the applied load exceeds the critical load that induces buckling. To evaluate the effect of slenderness ratio and the influence of constraining rotation in different axis on the structural behavior of H-section steel column member, explicit nonlinear FEM analysis were carried out with reasonable accuracy. To verify the nonlinear finite element analysis, compression test was conducted and both inelastic deformation and the relationship between load-displacement curves were compared. The cumulative energy curve calculated from the load-displacement relationship curve has also been compared and satisfactory result was obtained. From the analysis result the part total energy (the total energy absorbed by the flanges and web) for the two constrain conditions was presented. Furthermore, based on the deflection theory, the relationship between load and displacement was also proposed.