带暗支撑的水平拼接叠合剪力墙抗震性能试验研究

Experimental Study on Seismic Behavior of Horizontal Splicing Precast Composite Shear Wall with Concealed Bracings

为了从构造上优化叠合剪力墙的水平拼接节点,本文分别设计了1片带暗支撑的全现浇自密实混凝土(SCC)剪力墙和1片带暗支撑的水平拼接SCC叠合剪力墙,进行了拟静力试验,系统地比较分析了两个试件的裂缝分布、破坏形态、承载力、滞回曲线、骨架曲线、刚度退化、位移延性以及耗能能力等性能。研究结果表明:与全现浇剪力墙相比,水平拼接叠合剪力墙的裂缝分布及破坏形态与前者基本相同,均为弯剪破坏,承载力与各项抗震指标也均与前者相当,具有良好的抗震性能;水平拼接节点构造合理,沿水平拼接节点处未出现任何竖向裂缝及相对错动,试件呈现出良好的整体性,预制墙体与现浇墙体可以协同受力;仅在墙体塑性铰区布置暗支撑的水平拼接SCC叠合剪力墙也能有较好的抗震性能。

In order to optimize the horizontal splice of precast composite shear wall,one piece of cast-in-situ SCC shear wall with concealed bracing and one piece of horizontal splicing precast composite SCC shear wall with concealed bracing are designed respectively. Quasi-static tests of two shear wall specimens are carried out,the crack distribution,failure mode,bearing capacity,hysteretic loops,skeleton curves,stiffness degradation,displacement ductility and energy dissipation of the two test specimens are systematical analyzed and compared. The test results indicate that the horizontal splicing shear wall almost has the same crack distribution and bending-shear failure mode as the cast-in-situ shear wall,the precast composite shear wall with horizontal splice also has the similar bearing capacity and seismic behavior indexes compared with the cast-in-situ shear wall,which makes the precast composite shear wall have good seismic behavior. Horizontal splice is reasonable that any vertical crack and relative sliding have not come up along the horizontal splice,which makes the precast composite shear wall have good integrity so that all parts can bear load together. The precast composite shear wall embedded the concealed bracings within shear wall＇s plastic hinge still can obtain good seismic behaviors.