Abstract
A comprehensive numerical investigation of cold-formed stainless steel cross-sections subjected to combined compression and bending is presented in this paper. A non-linear finite element model (FEM) including geometric and material non-linearities was developed using the finite element package ABAQUS. Upon validation of the FEM, the model was then used for an extensive parametric study to investigate the interaction effects of constituent plate elements of cold-formed stainless steel square and rectangular hollow section beam-columns.The investigation indicates that the interaction effects of constituent plate elements on cross-section response are obvious particularly for slender sections. Current design provisions on Class 3 and Class 2 slenderness limits and effective width equations specified in American Specification, EC3 code and proposed by Gardner are not suitable for square and rectangular stainless steel hollow section beam-columns since the interaction effects of constituent plate elements are ignored. The new Class 3 and Class 2 slenderness limits and the section capacity design equations based on the whole cross-section response enable more accurate prediction of local buckling, thus allowing better utilization of material and more economic design.
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