Evaluation of Buckling Load and Specified Compression Strength of Welded Built-up H-section Compression Members with Residual Stresses

Abstract

Evaluation of Buckling Load and Specified Compression Strength of Welded Built-up H-section Compression Members with Residual Stresses Residual stress;Design axial compressive strength;Buckling load;Built-up H-section;Finite-element analysis; Residual stress is defined as stress that already exists on a structural member from the effects of welding and plastic deformation before the application of loading. Due to such residual stress, welded H-section compression members under centroidal compression load can undergo buckling and failure for strength values smaller than the predicted buckling load and specified compressive strength. Therefore, this study was carried out to evaluate the effect of residual stress from welding on the determination of the buckling load and specified compressive strength of the H-section compression member according to the column length variation. A three-dimensional nonlinear finite element analysis was performed for the H-section compression member where the welded joint was fillet welded by applying heat inputs of 3.1kJ/mm and 3.6kJ/mm using the SAW welding method.