Experimental Study on Seismic Performance of Precast Concrete Shear Walls with Hybrid Connections

Seismic performance of full-scale precast concrete shear walls with grouting sleeve/grouting-anchor hybrid connection was tested under low cyclic loading and compared with the cast-in-place shear wall. The tested parameters include the longitudinal steel reinforcement connection mode and the number of the connection row. The results show that all precast walls have a flexural failure under low cyclic loading, with the yielded longitudinal steel reinforcement and crushed concrete at the bottom of the walls. The ultimate interlayer displacement angle of each wall is in the range of 1/59 similar to 1/50, which meets the requirement of the elastic-plastic interlayer displacement angle limit. The hysteretic curves of the four shear walls are similar. The positive and negative average bearing capacity of precast walls PW1, PW2 and PW3 are 1.07, 1.02 and 1.2 times higher than that of the cast-in-place wall SW1, respectively; their ductility coefficients are 0.77, 0.74 and 0.96 times that of SW1, respectively, and their cumulative energy dissipation rate are 0.89, 0.64 and 0.87 times that of SW1, respectively. Besides, the four walls have a similar stiffness degradation trend. The shear deformations of PW2 and PW3 are significantly smaller than those of SW1 and PW1. The seismic performance of PW2 (double-row hybrid connection) is close to that of PW1 (grouting sleeve connection) but is poorer than PW3 (single-row hybrid connection).