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按性能设计理论,在剪力墙两端设置端柱,并在构件的塑性铰区采用分段约束高强箍筋,设计了6个带端柱高强混凝土剪力墙试件,进行了拟静力试验,对其破坏形态、滞回特性、变形能力、刚度退化、耗能能力、截面应变等进行了研究。根据试验结果,给出了6个试件在使用良好、生命安全和防止倒塌3个性能水平对应的位移角分布范围和平均值;分析了轴压比、剪跨比、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,端柱可以对剪力墙提供有效约束,提高剪力墙的变形能力和耗能能力;设置端柱并根据轴压比和位移延性需求确定的分段约束箍筋数量及范围,可以明显改善高强混凝土剪力墙的脆性,使高强混凝土剪力墙的延性指标达到设计要求;3个性能水平对应的位移角与构件的损伤程度有较好的相关性,可以用作这种构件的性能指标。
According to the theory of performance design, the end columns are set on both ends of the shear wall, and the high-strength concrete shear wall specimens with end columns are designed by the segmental restraining high-strength stirrups in the plastic hinge area of the members. Quasi-static Experiments were carried out to study the failure modes, hysteresis characteristics, deformability, stiffness degradation, energy dissipation capacity and cross-sectional strain. According to the test results, the displacement angle distribution range and average value of 6 specimens are given in accordance with the three performance levels of good use, safety of life and prevention of collapsing. The axial compression ratio, shear span ratio, the number and scope of restraining stirrups And other factors, the ductility of the shear wall, energy consumption capacity and the impact of damage morphology. The results show that the end column can provide effective restraint to the shear wall to improve the deformation capacity and energy dissipation capacity of the shear wall. The number and scope of the segmental restraining stirrups determined by axial compression ratio and displacement ductility needs to be set. Can significantly improve the brittleness of high-strength concrete shear walls, so that the ductility index of high-strength concrete shear walls meet the design requirements; the displacement angle corresponding to the three performance levels has a good correlation with the damage degree of the components and can be used as such components The performance index.