装配式开洞钢管混凝土剪力墙抗震性能试验研究

Experimental study on seismic performance of prefabricated shear wall with concrete filled steel tube and openning

为研究洞口偏置装配式钢管混凝土组合剪力墙结构的抗震性能,对3片两层单跨缩尺比为1∶3的开洞剪力墙进行了拟静力试验。剪力墙的主要变化参数为洞口位置,洞口偏心率分别为0、30%、60%,对比分析了剪力墙的承载能力、滞回性能、耗能性能及刚度退化等。研究结果表明:洞口偏置导致正负向加载时剪力墙的承载力、刚度、延性以及连梁受力不同;洞口偏心率为0和30%的剪力墙,表现出较好的抗震性能,随着偏心率的增大,剪力墙的承载力、延性及耗能能力均显著降低,刚度退化快;当2个墙肢截面高度相差3倍以上时,含钢管混凝土暗柱的小墙肢会过早出现受拉破坏,为此应避免开边洞情况。

To study the seismic behavior of prefabricated shear wall with concrete filled steel tube and off-centered opening,quasi-static tests on three 1 /3 scaled prefabricated two-story shear wall with concrete filled steel tube and opening were carried out. The main experimental parameter was the eccentricity ratio of opening. The eccentricity ratios of opening were 0,30%,60% respectively. The bearing capacity,hysteretic behavior,stiffness degradation curve and the energy dissipating capacity of the specimens were analyzed. The experimental results show that the eccentricity can lead to different ultimate bearing capacity,ductility and mechanical behavior of coupling beam. The specimens with the eccentricity ratios of opening equal to 0 and 30% show a good seismic behavior. With the increase of the eccentricity ratio,the ultimate bearing capacity,ductility and energy dissipating capacity of the specimens are all decreased remarkably,and the stiffness degradation accelerated. When the depth of section of wall piers has more than three times difference,the smaller wall limb with the concrete filled steel tube appears tensile failure,indicating that the side hole should be avoided.