套筒灌浆缺陷整治预制混凝土剪力墙抗震性能试验研究

为了研究预制混凝土剪力墙的套筒灌浆缺陷整治效果,设计了带灌浆缺陷的预制混凝土剪力墙,采用直接补灌法和破型修复法整治后开展了低周反复加载试验,对比了套筒灌浆缺陷整治前后预制剪力墙的抗震性能,考察了整治前后预制剪力墙的破坏特征和滞回性能的变化规律.试验结果表明:所有预制剪力墙发生了墙底截面破坏与套筒连接区域破坏这两种破坏模...

Experimental study on seismic performance of precast concrete shear walls with treatment of sleeve grouting defects

In order to investigate the effect of sleeve grouting defects on precast concrete shear walls, precast concrete shear walls with grouting defects ware designed. After treatment by the methods of direct refilling and repairing after breaking, low-cycle reversed loading experiments were carried out. The seismic performance of precast shear walls before and after treatment of sleeve grouting defects were compared and the change of failure feature and hysteretic characteristics of precast shear walls before and after treatment of sleeve grouting defects were studied.It is found that all the specimens suffer two failure modes, i.e., failure at the bottom of shear wall and failure in the area of sleeve connection. The defective precast shear walls have a failure in the area of sleeve connection, while the precast shear walls after treatment have a failure at the bottom of shear wall, which is the same as that of intact precast concrete shear wall. Compared with the intact precast shear wall, the peak load of defective precast shear walls is reduced by 6% to 32%, the total cumulative energy dissipation is reduced by 21% to 35%. After the treatment of sleeve grouting defects, the peak load of defective precast shear walls is increased by 7% to 44%, and the total cumulative energy dissipation is increased by 5% to 48%. The adverse effect of grouting defects on the seismic performance of precast shear walls increases with the increase of number of defective sleeves. The hysteretic characteristics, including load-carrying capacity, ductility, stiffness and energy dissipation capacity, of the defective precast shear walls after treatment have basically recovered to the level of the intact precast shear wall. The method of directly refilling is safe, effective and simple to operate, which is recommended to practical engineering applications.