冷挤压套筒连接RC装配式剪力墙抗震性能试验研究

为解决RC装配式剪力墙钢筋连接施工和质量检验困难的问题，提出了一种采用冷挤压套筒钢筋连接方式的装配式剪力墙构造形式。为探明此连接方式装配式剪力墙的可行性及其抗震性能，完成7个装配式剪力墙试件和2个现浇剪力墙对比试件的拟静力试验。对试件的水平荷载-侧移曲线及其特征点、钢筋应变进行了分析。结果表明：装配式剪力墙试件和现浇剪力墙试件均为压弯破坏。在简化构造的情况下，冷挤压套筒连接能有效传递钢筋拉压力。采用该连接的装配式剪力墙具有良好的抗震性能，耗能能力、延性均与现浇剪力墙试件接近。在轴压比为0.25~0.6范围内，轴压比增大，承载力增大，极限位移角减小；在剪跨比为0.9~1.35范围内，剪跨比增大，承载力减小，极限位移角增大，刚度退化更为平缓。

Experimental study on seismic behavior of precast RC shear walls connected by extruding steel sleeves and rebars

A type of precast reinforced concrete (RC) shear wall connected by extruding steel sleeves and rebars was proposed to solve the problem of difficult connection construction and quality inspection of reinforcement in precast RC shear wall. To investigate the feasibility and seismic performance of the precast RC shear wall, a series of pseudo-static tests of seven precast shear walls and two cast-in-situ shear walls were conducted. The hysteretic curves, characteristic points, and the strains of steel bars of specimens were analyzed. The test results show that the precast and cast-in-situ RC shear wall specimens all fail in bending failure. In the case of simplified arrangement of reinforcing bars, the cold-extrusion sleeve connection can effectively transmit the tension stress of reinforcing bars. The shear walls connected by extruding steel sleeves and rebars have a satisfactory seismic performance. The energy dissipation capacity and ductility are close to those of the cast-in-situ walls. Moreover, within the range of axial compression ratio from 0.25 to 0.6, as the axial compression ratio increases, the bearing capacity increases, and the ultimate displacement angle decreases. Within the range of shear span ratio from 0.9 to 1.35, as the shear span ratio increases in the tests, the bearing capacity reduces, the ultimate displacement angle increases, and the stiffness degradation is gentler.