横向约束钢筋新配筋方案高性能混凝土剪力墙抗震性能的试验研究

Experimental study on seismic behavior of high performance concrete shear wall with new strategy of transverse confining stirrup

为改善高性能混凝土剪力墙的变形能力,提出了在截面两端采用横向约束钢筋新配筋方案———分段约束高强箍筋,并按性能设计理论设计了4个高性能混凝土剪力墙试件,进行了拟静力试验;分析了轴压比、约束箍筋数量及范围等因素对剪力墙的延性、耗能能力和破坏形态的影响.研究结果表明,横向约束钢筋新配筋方案能有效增大高性能混凝土剪力墙截面的约束效果,根据轴压比和位移延性需求确定的分段约束箍筋数量和范围,可以明显改善高性能混凝土的脆性,使高性能混凝土剪力墙的延性指标达到设计要求.

In order to improve the deformability of high performance concrete shear wall, a new strategy of transverse confining stirrup, a parted confining stirrup, is presented in this paper. Four specimens of high performance concrete shear wall were designed and the quasi-static test had been carried out according to performance-based seismic design theory.Then, the influence of the axial compression ratio, the amount and range of confinement reinforcement on the ductility, the capacity of energy dissipation and failure behavior are analyzed. It was shown that the confining effect of shear wall sections is improved by the new strategy of transverse confining stirrup. In addition, the amount and range of parted confining stirrup determined by the axial compression ratio and displacement ductility demand is demonstrated to be reasonable. The seismic behavior of high performance concrete shear walls is obviously improved and the ductility level of the specimens well meet the demands of design.