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Seismic performance of precast short-limb composite shear walls with integrated spatial steel frames
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DOI：10.1016/j.istruc.2026.112801.png)
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Abstract
En 中文
Owing to their limited ductility, conventional prefabricated reinforced concrete (RC) short-limb shear walls are vulnerable to brittle failure in high-intensity seismic regions. A series of steel-concrete composite shear walls has been developed as modifications. A novel steel-concrete composite shear wall system with angle steel frames and diagonal reinforcement is proposed and studied in this work. The embedded angle steel frames serve as both enhancing elements for concrete at boundaries and structural connection components for assembly, and the diagonal reinforcement is designed for crack suppression. Five scaled specimens (scale factor 0.5) were tested under quasi-static cyclic loading, with experimental variables including reinforcement configuration and axial load ratio (ranging from 0.175 to 0.351). A finite element (FE) model was developed and validated against the test results. Parametric studies were then conducted to determine the parameter sensitivities. Results indicate that the angle steel skeletons improve the load-carrying capacity and the ductility of the steel-concrete composite shear wall, and further improvement in ductility and equivalent viscous damping ratio can be achieved using diagonal reinforcement oriented at ±45°. Since the axial load ratio significantly affects the ductility performance of shear walls, a maximum value of 0.50 was determined based on the experimental and analytical results for the seismic design of the proposed steel-concrete composite shear walls; and the suggested limit values are within 0.30 and 0.25 for common and high-intensity seismic regions, respectively.
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