高强筋材混凝土剪力墙抗震及自复位性能试验研究

Seismic and self-centering behavior of shear-walls reinforced with high strength bars

为研究配置钢绞线的钢筋混凝土剪力墙和配置钢绞线及CFRP筋的钢筋混凝土剪力墙的抗震性能及可恢复能力,完成了3个剪力墙试件的低周反复荷载试验,其中包括1个普通钢筋混凝土剪力墙对比试件。研究了在钢筋混凝土剪力墙中配置钢绞线和CFRP筋对剪力墙的破坏形态、裂缝发展、滞回性能、残余变形、残余裂缝、延性、刚度和耗能能力等的影响。结果表明:配置钢绞线和CFRP筋能够减小剪力墙的破坏区域,增大墙体的裂缝发展范围,减小刚度退化速率,但剪力墙的延性略有降低,滞回曲线饱满程度下降,耗能能力有所降低;同时,高强筋材混凝土剪力墙的残余变形和残余裂缝宽度较普通钢筋混凝土剪力墙的显著减小,自复位能力较好。

In order to evaluate the seismic performance and resilience of shear walls with steel strands and those with both steel strands and CFRP bars, three shear wall specimens,including a normal reinforced concrete, were tested under lateral reversed loading. The effect of steel strands and CFRP bars on the failure modes, crack development, hysteresis performance, residual deformation, residual crack, ductility, stiffness and energy dissipation capacity were studied. The test results indicate that the steel strands and CFRP bars can reduce the damaged areas, allow a wider distribution of cracks, and mitigate stiffness degradation,although the hysteretic curves become more pinched. The ductility and energy dissipation are also decreased slightly. However, the residual deformation and residual cracks of shear-walls reinforced with high strength bars are significantly reduced, showing satisfactory self-centering capability.