Behaviour and design of cold-formed normal- and high-strength steel SHS and RHS columns at elevated temperatures

The behaviour of cold-formed normal- and high-strength steel columns with square rectangular hollow sections (SHSs RHSs) at elevated temperatures was investigated numerically in this paper. A finite element model developed validated against experimental results for the SHS RHS stub long tested ambient temperatures. Parametric studies were subsequently conduced on various cross-section slenderness member ranging from to 800 °C. Based numerical reported literature, applicability existing design approaches European North American standards evaluated. evaluation shows that provide quite conservative strength predictions except overestimation cross-sectional resistance obtained based standard. Modified proposed improve accuracy can be safely applied generate designs under • Cold-formed investigated. FE accurately predicting structural behaviour. Results parametric experiments used assess methods. Accuracy methods discussed. more accurate are developed.