双层钢板混凝土组合剪力墙滞回性能研究

为研究双层钢板混凝土组合剪力墙的滞回性能，对4个剪跨比为2.5的组合剪力墙试件进行了拟静力加载试验；通过改变约束拉杆和加劲肋的间距，研究其在往复水平荷载作用下的破坏机理、滞回性能；选用地震分析软件OpenSees建立了双层钢板混凝土组合剪力墙的纤维模型，进行了低周反复荷载作用下的非线性分析。结果表明:该种剪力墙的破坏形态为墙底部截面钢板被压曲，核心混凝土被压碎的弯曲型破坏；在轴压比相同条件下，设置加劲肋试件的抗震性能优于设置约束拉杆的试件，且随着约束拉杆和加劲肋间距的减小，试件的变形能力增加，表现出较好的耗能能力；纤维模型计算得到的抗弯承载力、延性系数与试验值之间误差较小，纤维模型能较好地模拟剪力墙的抗震性能；随着轴压比的增大，剪力墙的极限承载力有所提高，而变形能力有明显的下降；随着混凝土强度的增加，剪力墙的承载力提高，变形能力减小；随着钢板厚度的增加，剪力墙的承载力和变形能力都明显增加。

Research on Hysteretic Behavior of Dual Steel Concrete Composite Shear Walls

In order to research the hysteretic behavior of dual steel concrete composite shear walls, the quasi static tests of four specimens were carried out. The shear span ratio of all specimens was 2.5. The failure mechanism and hysteretic behavior under lateral cyclic loading were investigated by changing the spaces of binding bars and stiffeners. Based on the seismic analysis software OpenSees, the fiber model method was used to establish numerical simulation model of dual steel concrete composite shear walls, and the nonlinear analysis under low cyclic loading was carried out. The results show that the failure patterns of the shear wall include the buckle of the steel tube and the crash of core concrete at the base of the specimens. Under the same condition of axial compression ratio, the specimens with stiffeners show better seismic performance than the ones with binding bars. Moreover, the deformation of the specimen is significantly improved when the spaces of stiffeners and binding bars decrease, and the specimens show better energy dissipation capacity. It makes no difference between the theoretical and experimental values of flexural load bearing capacity and ductility coefficient, and the fiber model can better simulate the seismic performance of shear walls. With increase of the axial compression ratio, the deformation of the shear walls decreases, and the ultimate load bearing capacity is improved. With increase of the concrete strength, the load bearing capacities are improved, the deformation of the shear walls decreases. With increases of the steel thickness, the deformation and load bearing capability of the shear walls are significantly improved.