间隔钢管混凝土组合剪力墙抗震性能试验研究

间隔钢管混凝土组合剪力墙是一种新型抗侧力构件，其施工方便、布置灵活，具有良好的经济效益和工程应用价值。为研究轴压比对这种新型抗侧力构件的抗震性能的影响，对3个不同轴压比的足尺四管间隔钢管混凝土组合剪力墙试件进行水平低周反复加载试验，观察组合剪力墙破坏特征和破坏过程，得到组合剪力墙的滞回曲线、骨架曲线、承载力和刚度退化、延性、耗能能力等抗震性能指标。结果表明：组合剪力墙的破坏形式均为受压区钢管内混凝土压溃和钢管壁凸屈，缀板与钢管连接区域撕裂；随着轴压比增大，组合剪力墙的刚度和承载力增大，延性降低，与轴压比为0的组合剪力墙相比，轴压比为0.4的剪力墙承载力提高25%，延性降低19%；组合剪力墙的位移延性系数在2.401~3.479之间，极限位移角在1/40~1/34之间，等效黏滞阻尼系数达到0.15，整体抗震性能良好。

Experimental study on seismic behavior of interval concrete-filled steel tube composite shear wall

Interval concrete-filled steel tube composite shear wall is a new type of anti-lateral force component, which is convenient in construction and flexible in layout. It has good economic benefits and engineering application value. In order to study the influence of axial compression ratio on the seismic performances of this new type of lateral resistance member. The horizontal low cycle reversed loading test was carried out on three full scale four-tube interval concrete-filled steel tube composite shear wall specimens with different axial compression ratios. The failure characteristics and failure process of the composite shear walls were observed. The seismic performance indexes of composite shear walls such as hysteretic curve, skeleton curve, load-carrying capacity and stiffness degradation, ductility and energy dissipation capacity were obtained. The results show that the failure modes of composite shear walls are crushing of concrete inside the steel tubes, buckling of steel tube wall in the compression zone, and tearing in the connection area between batten plates and steel tubes. The stiffness and load-carrying capacity of composite shear wall are obviously enhanced with the axial compression ratio increased, but the ductility is reduced. Compared with the specimen with the axial compression ratio of 0, the bearing capacity of the specimen with the axial compression ratio of 0.4 is increased by 25%, and the ductility is reduced by 19%. The ductility coefficients of the specimens are between 2.401-3.479. The ultimate drift angle is between 1/40-1/34. The equivalent viscous damping coefficients reach 0.15. The overall seismic performance is good.