Seismic Performance of Precast Single Steel Plate Concrete Composite Shear Walls with Angle Steel Stiffeners

Steel-concrete composite shear walls effectively improve the load-carrying capacity and seismic performance by utilizing the composite interaction between steel plates and concrete, thus being widely applied in practical engineering. This paper proposes a novel precast single steel plate concrete composite shear wall with angle steel stiffeners for pure shear wall structures. Two structural configurations, namely interior and exterior walls, as well as the wall connection between upper and lower stories, were designed. To investigate the seismic behaviour of this new precast composite shear wall, interior and exterior wall specimens were fabricated, and quasi-static cyclic loading tests were carried out. The failure mode, hysteretic response, energy dissipation capacity and stiffness degradation under low-cycle reversed loading were systematically analysed. The test results indicate that both interior and exterior wall specimens underwent flexure-shear failure and exhibited favourable seismic performance. The finite element model was established and validated based on the experimental results. Parametric analyses were further conducted to quantify the effects of reinforcement ratio, steel ratio, concrete strength, and axial compression ratio on the seismic performance of the walls. Numerical results indicate that increasing the reinforcement ratio only slightly improves the seismic performance of exterior walls, but remarkably enhances the seismic behaviour of interior walls. High-strength concrete elevates the load-carrying capacity but drastically degrades structural ductility, whereas low-strength concrete induces premature local buckling in interior wall specimens. A high axial compression ratio reduces the load-carrying capacity and energy dissipation capacity of the shear wall, and triggers premature structural failure.