ABSTRACT
Abstract FEM statical elasto-plastic analysis is used to present the primary factors in the deformation and stress-strain behavior related to the fracture of cold-formed columns. Cold formed columns are modeled as rectangular hollow sections. General deformational behaviors of the cold formed columns with various forming processes are presented. The relationship between the local stress and strain of the cold formed corner and the stress-strain curves of the cold formed columns is investigated. Numerical examples are presented to illustrate the concentration of stress and strain, the effect of axial force under earthquake and the geometrical configuration factor on the local stress and strain behavior in the cold formed comer welded to a diaphragm plate. Key Words: Cold-formed Rectangular Hollow Sections, Local Stress and Strain Behavior, Mechanical Property, FEM Statical Elasto-plastic Analysis
Cold formed rectangular hollow sections (C-RHS below) have come to be widely used to the extent of more than one million metric tons a year for steel buildings in Japan. Most of them are manufactured by cold forming processes such as roll forming and press forming.
