Deteriorating hysteresis model for cold-formed steel shear wall panel based on its physical and mechanical characteristics

• Smooth hysteresis models for wood and steel sheathed cold formed steel SWP have been developed.
• The models have been implemented in OpenSees software version 2.4.5.
• Input parameters are introduced in terms of physical and mechanical properties of the SWP.
• Good correlation rate obtained with available experimental test results.
• Effect of aspect ratio, screw spacing, opening, sheathing thickness and framing thickness on the SWP.

Shear wall panels (SWP) are the primary lateral load resisting elements in cold-formed steel (CFS) structures. In this paper, smooth hysteresis models that take into account strength and stiffness degradation, as well as pinching effect have been developed and implemented in OpenSees software, as user-defined uniaxial materials named CFSWSWP and CFSSSWP for wood and steel sheathed SWP, respectively. The proposed analytical models are validated using the experimental tests results obtained from the literature, where a good agreement has been achieved. In order to investigate the influence of the CFS SWP parameters variation on the hysteresis characteristics of the response, several non-linear quasi-static analyses have been carried out using different CFS SWP configurations. The key parameters which have most affected the cyclic response were identified and assessed.