Influence of flange width and wall parameters on effectiveness of cold-formed steel Sigma-profile in bending behavior

The effectiveness of bending behavior of cold-formed steel profiles is studied. The purpose of the study was to estimate the influence of section parameters - flange width and size of the wall portion, adjacent to the flange – on effectiveness of the operation of flexural element consisting of two Sigma sections. As a criterion of effectiveness it was accepted the ratio of maximum bending moment available in the zone of elastic behavior of the section to its area reflecting the material consumption. Effective section characteristics are calculated in accordance with Eurocode 3. It was taken into account the local buckling parts of section and distortional buckling. Variable parameters are: flange width and portion of the wall adjacent to the flange. Calculations were executed by computer program CFSteel. Analysis of obtained results is presented.