Local buckling of cold formed steel in composite structural elements at elevated temperatures

Abstract

An inelastic semi-analytical finite strip method is used to analyse the local buckling behaviour of cold formed steel plates of composite steel-concrete structural elements at elevated temperatures. The decrease in yield stress and elastic modulus of the cold formed steel is represented at elevated temperatures by a series of nonlinear stress-strain relationships. The change in the material properties at elevated temperatures is shown to influence the local buckling behaviour of steel plate element in steel-concrete composite construction. Various boundary conditions are chosen in a parametric study, in which the influence of different variables is determined. Recommendations are given for the assignment of slenderness limits, and a simple method is presented to obtain the local buckling stresses at elevated temperatures. A design example of a profiled composite beam is used to illustrate the method presented.