Experimental Study on Seismic Behavior of Precast Shear Walls with Reinforcement Spliced by Grouted Sleeve Lapping Connector

Abstract:

To investigate the seismic behavior of grouted sleeve lapping connector, pseudostatic experiments were conducted on a castinplace shear wall and two different precast shear walls in which longitudinal reinforcement were connected by typeⅠand typeⅢgrouted sleeve lapping connector respectively. Initial crack appeared at the bottom of the castinplace shear wall, while for the precast shear walls, the initial crack appeared above the sleeve due to the vertical confinement of sleeve, and the cracking load of the precast wall was greater than the castinplace wall. At the ultimate stage, concrete were crushed at the root of the castinplace shear wall; the concrete cover around the sleeve peeled locally and then was destroyed, following the crush of the concrete above the sleeve in the precast shear walls. The ultimate bearing capacities of the two different types of shear wall were almost same. Compared to the castinplace shear wall, the cracked degree, yield load and ultimate displacement of the precast shear walls were larger, the ductility of the precast shear walls was a little lower. Due to the densification treatment of the horizontal bars in wall body and the stirrup of rim member in the region of sleeve, the energy dissipation of the precast shear walls was better than that of the castinplace shear wall. The strain curve of the steel bar above and below the sleeve is consistent, which shows that both typeⅠand type Ⅲ grouted sleeve lapping connectors performed well in transferring the stress of the steel bar.

Key words:precast shear wall; sleeve; hoop strain; hysteresis loop; cracking load; ultimate displacement