Seismic performance of high-strength steel plate-concrete composite shear walls

The application of high-strength steel plate-concrete composite shear walls in super high-rise frame-core tube structure can significantly increase the bearing capacity, reduce the dimensions of the core tube and the frame part, and harmonize the stiffness ratio of frame and core tube, therefore improve the economic efficiency. In order to study the seismic performance of the high-strength steel plate-concrete composite shear walls, pseudo-static tests on three composite shear wall specimens with an aspect ratio of 1.43 were conducted, the failure mechanism, strength, ductility and energy dissipation capacity of specimens with Q355B, Q460B, Q550B steel were studied. Experimental results showed that the crushing of concrete and the failure of vertical reinforcement at the corner leaded to the flexural failure of specimens; hysteresis curves of specimens showed good energy dissipating capacities without pinching phenomena; with the increase of the steel strength, the yield strength, yield displacement, peak strength and ultimate displacement of specimens increased, while ductility decreased. Finite element analysis was conducted using OpenSees, the modeling method had been proven accurately simulate the performance of the specimens, and was subsequently used for parametric study to investigate the impact of axial compression ratio, thickness of the embedded steel plate, and aspect ratio (height to width) on the performance of high-strength steel plate-concrete composite shear walls.