Experimental research on seismic performance of high-strength concrete composite shear walls with built-in steel plates under high axial compression ratio

The built-in steel plate concrete composite shear wall is mainly used in super high-rise building structures, and is the main component to resist lateral force. The shear wall at the bottom often bears huge vertical load. Therefore, the axial compression ratio and concrete strength are the main factors affecting its seismic performance. In order to investigate the seismic performance of high-strength concrete composite shear walls with built-in steel plates under high axial compression ratio, two specimens with shear-span ratio of 2.28 were tested under cyclic loading. The designed axial compression ratio was 0.6 and 0.8, respectively, and the concrete was C70.The mechanical behavior and failure modes of the composite shear walls under cyclic loading were studied, and the influence of axial compression ratio on seismic performance was analyzed. The results indicate that two specimens suffered from compression bending failure, and the failure sections conform to the assumption of plane section. The hysteretic curves are full, the energy dissipation capacity is good, and the horizontal bearing capacity is relatively stable. With the increase of axial compression ratio, the horizontal bearing capacity, initial stiffness, and energy dissipation capacity of composite shear walls increase, while the lateral deformation capacity decreases, but the yield displacement drift is still greater than 1/120, and the ultimate displacement drift is 1/46.This study provides a theoretical reference for engineering application of high-strength concrete composite shear walls with built-in steel plates. © 2020, Editorial Office of China Civil Engineering Journal. All right reserved.