ABSTRACT
It is not new to assess the strength enhancement induced during the process of fabrication of cold-formed sections. The strength enhancement in the corner regions of cold-formed carbon steel sections due to plastic deformation was first observed by Karren (Karren 1967). A power model providing the strength increase in terms of the yield stress of the virgin material and the internal radius of the corner Rc to thickness t ratio was proposed. The author suggested that since the corner regions can represent between 5% and 30% of the total cross-sectional area, the influence of the enhanced strength should be included in structural calculations.
