不同支撑形式的型钢混凝土剪力墙抗震性能试验研究

型钢混凝土剪力墙具有强度高、刚度大、稳定性好等优点,广泛应用在高层建筑中。为研究不同支撑形式对型钢混凝土剪力墙抗震性能的影响,进行了3个1/3缩尺的型钢混凝土剪力墙(型钢支撑布置形式分别为X型、AC1型和AC2型)和1个普通混凝土剪力墙对比试件在低周反复荷载作用下的试验研究,得到了其破坏过程的变化规律和破坏模式,分析了不同型钢支撑类型对剪力墙抗剪承载能力、裂缝开展、刚度、延性及耗能的影响规律。试验研究表明:型钢支撑对剪力墙的承载能力、刚度、延性及耗能性能均有较大幅度提高。试验研究表明:AC1型、AC2型和X型型钢支撑的剪力墙极限承载能力较普通混凝土剪力墙分别提升了71.9%、64.6%和49.4%,其延性系数分别提高了19.3%、5.0%和14.5%;型钢混凝土剪力墙的刚度退化速率与普通混凝土剪力墙相比更加缓慢,而且中后期刚度明显优于普通混凝土剪力墙;型钢混凝土剪力墙的塑性区范围较普通混凝土显著增加,试验获得的滞回曲线也更加饱满。

Experimental analysis on seismic performance of steel reinforced concrete shear wall with different types of steel bracings

The steel reinforced concrete shear wall is widely used in high-rise buildings for its high strength, high stiffness and excellent stability. In order to study the influence of different steel types on its anti-seismic performance, low cyclic loading test has been carried out, including three experiments on the 1/3 scale of steel reinforced concrete shear walls (the steel as brace is X-type, AC1-type and AC2-type, respectively) and one contrast experiment on a standard reinforced concrete shear wall. According to the failure process and modes, the bearing capacity, crack propagation, stiffness, ductility and energy dissipation of shear wall were significantly influenced. The experimental results show that the steel bracings results in a better performance of the bearing capacity, stiffness, ductility and energy dissipation capacity of the shear wall. The ultimate bearing capacity of shear wall was increased by 71.9%, 64.6% and 49.4% using AC1-type, AC2-type and X-type, respectively. The ductility coefficient was increased by 19.3%, 5.0% and 14.5% accordingly. The stiffness of the steel reinforced concrete shear wall with steel bracings is much better than that of the contrast specimen and the stiffness degradation rate is slower in the middle and later stages of experiment. In addition, the plastic zone of the steel reinforced concrete shear wall with steel bracings increases dramatically, and the hysteretic loop is more full.