By using the finite element analysis program ABAQUS

S4R5 general-purpose shell elements are employed for establishing the finite element models of cold-formed thin-wall C-section steel members under constant compression and cyclic bending.The geometric and material nonlinearities

the linear kinematic hardening and the effect of strain hardening at corner zone by cold-forming are taken into account in the model.The effect of the width-to-thickness ratio and the axial compressive ratio on the hysteretic behavior of the cold-formed steel members are analyzed.Analytic results indicate that the width-thickness ratio and the axial compressive ratio affect the hysteretic behavior of the member evidently.With the increase of the width-thickness ratio

the resistance

rotation capacity and plastic deformation capacity decreases.With the increase of the axial compressive ratio

the ultimate resistance decreases and the resistance degenerates.