Finite element computer models for analysis of cold-formed steel members

The development and implementation of finite element-based analytical models for the post-buckling, ultimate strength analysis of cold-formed steel (CFS) channel members have been considered in this paper. The specific requirements the finite elements should satisfy are identified, and the formulation of an efficient large deformation elasto-plastic shell finite element is presented. Experiments were performed to establish the variations of the material properties and the residual stresses across the sections, and idealized models were developed for the analysis. The analysis results, based on a finite element model for cold-formed steel members in compression, are compared to the results from experimental investigations. The nonlinear finite element analysis shows a good correlation with the test results.