Shear strength and post-ultimate behavior of multi-stiffened corrugated steel plate shear walls

Abstract

This paper investigated the shear resistance behavior of the multi-stiffened corrugated steel plate shear walls (MCSPSWs). Firstly, the effect of stress-strain models of steel material on the shear resistance behavior of the MCSPSW was analyzed. Then, based on a validated finite element (FE) model, parametric studies were performed to investigate the effects of key parameters on the shear resistance behavior of the MCSPSW. By reducing the aspect ratio or the yield strength, or by increasing the number of stiffeners, the bending rigidity ratio, or the plate thickness, both the ultimate and residual strength factors could be improved. The main shear resistance mechanisms of the MCSPSW under different parameter conditions and their impact on the post-ultimate ductility were indicated. Fitting formulas to predict the ultimate and residual strength factors were proposed with respect to the normalized slenderness ratio. It was found that both factors were negatively correlated with the normalized slenderness ratio. The proposed formulas provided conservative predictions of the ultimate strength and post-ultimate residual strength for the MCSPSW. Finally, a prediction model for the shear load-displacement curve of MCSPSWs was proposed, taking the normalized slenderness ratio as the variable. This prediction model agreed with the FE results and could be used as a simplified constitutive model of the MCSPSW considering both geometrical and material nonlinearities when conducting the push-over analyses under strong seismic loading.