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为研究钢筋混凝土Z形截面双向受剪柱的抗震性能,对4个缩尺比为1/2的试件进行拟静力试验,分析不同水平加载方向(加载角α分别取0°、45°、90°、135°)对其抗震性能的影响,研究Z形截面柱的破坏形态,得到试件的荷载-位移滞回曲线、骨架曲线、承载力、位移延性系数、刚度退化和耗能能力等力学性能指标。研究结果表明:试件在水平反复荷载作用下的破坏形态为弯剪破坏、弯曲破坏、剪切黏结破坏和剪切斜压破坏,其中剪切破坏的试件延性较差;双向水平荷载作用方向对Z形截面柱受剪承载力的影响近似符合椭圆规律,在加载角为45°时,试件的耗能能力最强,当加载角为0°和135°时,试件的耗能能力相差不大。提出钢筋混凝土Z形截面柱双向受剪承载力的计算方法,按该方法对本次试验和已有试验共22个试件进行计算,计算结果与试验值吻合较好。
In order to study the seismic behavior of reinforced concrete with biaxially shearing columns with Z-shaped cross-section, four pseudo-static tests were carried out on four specimens with a scale ratio of 1/2. The loadings at different horizontal loading angles (0 °, 45 ° , 90 °, 135 °) on the seismic performance of the Z-shaped cross-section column were studied. The load-displacement hysteresis curve, the skeleton curve, the bearing capacity, the displacement ductility coefficient, the stiffness degradation and the energy dissipation capacity Other mechanical properties. The results show that the failure modes of specimens under horizontal repeated load are bending shear failure, bending failure, shear bond failure and shear baroclinic failure. Among them, the ductility of shear failure specimens is poor; the direction of bi-directional horizontal load The influence on the shear capacity of Z-section columns approximates elliptic law. When the loading angle is 45 °, the energy dissipation capacity of the specimen is the strongest. When the loading angle is 0 ° and 135 °, the energy dissipation capacity no big difference. The calculation method of the biaxial shearing bearing capacity of Z-shaped RC columns with reinforced concrete is proposed. According to this method, a total of 22 specimens of this test and the existing tests are calculated. The calculated results are in good agreement with the experimental values.