Seismic Performance and Design of Concrete-Filled Double-Steel-Plate Composite Coupled Shear Wall with U-Shaped Steel–Concrete Composite Beams

Abstract

Concrete-filled double-steel-plate composite shear walls and cold-formed U-shaped steel–concrete composite beams have been recently developed for high-efficiency steel plate–concrete composite structures. In this study, a novel composite coupled shear wall (U-DSP-CW) specimen was designed and subjected to a quasi-static test, with two concrete-filled double-steel-plate composite shear walls connected by U-shaped steel–concrete composite coupling beams. The seismic performance of the novel composite coupled shear wall was evaluated based on its failure modes, hysteretic behavior, ductility, and stress distribution. The experimental results demonstrate that the U-DSP-CW system successfully achieved the intended “strong joint-weak member” and “strong walls-weak coupling beams” failure sequence, with joint regions remaining intact. The specimen exhibited stable hysteretic behavior and energy dissipation capacity, with a displacement ductility factor exceeding 3.0, although the ultimate drift ratio reached was approximately 1.0 %. A finite element (FE) model of the U-DSP-CW was developed in ABAQUS and validated against the experimental data, accurately capturing both the global load-displacement response and failure modes. Furthermore, multistory U-DSP-CW structural systems were established to investigate the influence of the coupling ratio. Based on the pushover analysis, the yield sequence of the components and the overall energy dissipation mechanism were examined. Finally, design recommendations, including the interstory drift ratio limit and a reasonable coupling ratio range, are proposed to facilitate practical engineering applications, including interstory drift ratio limits of 1 / 600 , 1 / 250 , and 1 / 85 for frequent, moderate, and rare earthquakes, respectively, and a reasonable coupling ratio range of 0.30 to 0.50.