Experimental analysis on the seismic performance of prefabricated double-face superposed shear walls with different horizontal connection

Quasi-static tests on four double-face superposed shear walls with different horizontal connection as well as on one cast-in-place shear wall were carried out. Their failure modes, hysteretic loops, bearing capacity, displacement ductility, energy dissipation capacity and stiffness degradation were comparatively analysed. The test results indicate that the ultimate failure pattern of the double-face superposed shear walls is the same as that of the reinforced concrete shear wall. The seismic indexes of some double-face superposed shear walls are the same as that of the reinforced concrete shear wall, which indicates they have good seismic behavior. The bearing capacity of double-face superposed shear walls with horizontal connection of a vertical bar or a vertical bar with constraint spiral stirrups are more close to that of the cast-in-place wall. With the same vertical bar joining method, the double-face superposed shear wall specimens with constraint spiral stirrups in the lap zone have stronger ultimate deformation capacity than those without spiral stirrups, but the bearing capacity is not much different. The seismic behavior of double-face superposed shear walls with vertical bar joining whose laplength is greater than 1.2laE in horizontal connection can satisfy the current code requirements. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.