Seismic performance research on new precast concrete shear wall

Abstract

New precast concrete (NPC) shear wall consists of upper and lower prefabricated wall panels connected with reservation connection reinforcements inserted in the reserved galvanized metal bellows with full grout. The accomplished test results have demonstrated that the force mechanism of NPC shear wall is significantly different from that of traditional cast-in-situ concrete shear wall. To grasp the seismic performance of NPC shear wall, nonlinear numerical model, which was based on the test results, was established to investigate the influence of axial compression ratio, stirrup ratio of the shear wall, concealed column, diameter and amount of connection reinforcements and anchorage length of connection reinforcements on the model's curve of shear force vs. displacement of the load point. The seismic performance was evaluated from aspects of strength and deformability. The analysis results show that axial compression ratio and amount of connection reinforcements are sensitive parameters to the ultimate force and all the parameters concerned are influential to the ultimate displacement. The effect of axial compression ratio is complicated and increased amount of connection reinforcements can obviously enhance the capacity of NPC shear wall. Based on the findings, simplified calculation formula of shear resistance capacity was presented, and its applicability was confirmed by comparing the calculation results with testing results and nonlinear analysis results.