预制混凝土双板剪力墙抗震性能试验

Seismic behavior test for double-wall precast concrete shear wall

为评价预制混凝土双板(DWPC)剪力墙的抗震性能,对2个DWPC剪力墙和1个现浇剪力墙的足尺比例试件在轴压比为0.1的条件下进行低周反复荷载对比试验研究,较系统地分析两类试件的滞回曲线、骨架曲线、位移延性、刚度退化及耗能能力等。结果表明,3个试件均发生弯曲破坏;经过构造改进的DWPC剪力墙具有良好的整体工作性能;在边缘构件U形筋搭接连接范围设置3重连续复合螺旋箍筋加强对核心区混凝土的约束作用,提高DWPC剪力墙的刚度和承载能力,其中极限荷载提高了22%~23%,但DWPC剪力墙的位移延性系数降低到5;DWPC剪力墙的耗能能力在试件屈服前与现浇剪力墙接近或相同,屈服后略有降低。

To evaluate the seismic behavior of double-wall precast concrete(DWPC) shear wall, three full scale specimens are tested and compared under low-cyclic reversed loading with axial compression ratio of 0.1, including two DWPC shear walls and one cast-in-situ shear wall. Some systematic analyses were made on hysteretic curves, skeleton curves, displacement ductility coefficients, bearing capacity, stiffness degradation and energy dissipation capacity of specimens. The results show that all specimens fail in bending. The improved DWPC shear walls can work together well. The three continuous circular spiral stirrups in the range of U-shaped connection steel bars confine the boundary element concrete; also improve the stiffness and bearing capacity of DWPC shear walls. The ultimate loads of DWPC shear walls increased by 22% to 23%. But the displacement ductility ratios reduced to 5. The energy dissipation capacities of DWPC specimens are basically the same within the elastic range and are lower than those of cast-in-situ specimen beyond the elastic range. All the specimens have shown favorable seismic performance.