Seismic performance quantification of buckling-restrained steel plate shear wall-RC frame structures

The beam-connected buckling-restrained steel plate shear wall (SPSW) has the advantages of high bearing capacity, strong energy dissipation and good ductility, and flexible arrangement in the structure, which can reduce the force acting on the frame columns and avoid premature failure of the frame columns. To determine the SPSW configuration in structures to fully exploit the seismic performance, a plastic design method of the steel plate shear wall-RC frame structure (SPSW-RCF) was proposed based on energy balance in this paper. The expected global failure mechanism was constructed and the double lateral resistance SPSW-RCF system was decomposed into SPSW system and RC frame system by using shear force ratio. The design base shear was calculated based on the energy balance principle to determine the design lateral story shear forces of the SPSW and RC frame systems, and then the design of SPSWs could be completed. Considering the post-yield behavior of SPSWs and the plastic internal force distribution mechanism, internal forces of beams and columns were calculated, and then the design of the RCF could be completed. 56 SPSW-RCF structures with different story numbers and story shear ratios were designed, SPSW thickness and reinforcements of the SPSW-RCF were compared. By performing the nonlinear dynamic analysis under 22 ground motions, the maximum interstory drift ratios, SPSW maximum displacement ductility, yield mechanism, residual drift ratio and story shear ratio of structures with different story numbers and story shear ratios were comparatively investigated. Further-more, the actual SPSW-resisted story shear ratio was quantified and the recommended design SPSW-resisted story shear ratio was suggested.