Abstract
This paper reports a comprehensive numerical investigation into the cross-section behavior and resistances of stainless steel lipped channel columns under axis compression. To obtain the influence of strain hardening index n and nominal yield stress σ0.2 on the design DSM compression resistance for a stainless steel lipped channel cross section, numerical parametric study has been firstly performed. It indicates that the strain hardening exponent n has a strong effect on the DSM strength prediction of stainless steel lipped channel columns, but nominal yield stress σ0.2 has a limited effect on the DSM curve due to it already included in the DSM. A DSM model was proposed that could take into account the strain hardening exponent n and different buckling modes, and a range of numerical parametric study was conducted. Based on the proposed DSM model, a set of DSM equations was proposed for stainless steel lipped channel column. The strength predictions formula is suitable for different types of stainless steel materials, and only the corresponding strain hardening coefficient n needs to be selected according to the stainless steel material. The comparison between the test results and design predictions indicates that the proposed equations are able to capture the nominal axial strength of the stainless steel lipped channel column
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