半刚接钢框架内填RC墙结构滞回性能试验——局部性能分析

Experimental study of partially-restrained steel frame with RC infill walls:local performance analysis

通过对3榀2层1跨的半刚接钢框架内填钢筋混凝土剪力墙结构(简称PSRCW)的低周反复荷载试验,重点研究结构局部受力性能,分析PSRCW结构中半刚性节点及内填墙的破坏模式与变形能力、钢框架与内填墙界面分离及滑移、以及两者之间的内力分配等局部性能。分析结果表明:内填墙的存在对半刚接节点的变形能力具有一定刚化影响,降低了节点的转动能力;在确保抗剪连接件在加载过程中不发生疲劳断裂的前提下,不同类型的抗剪连接件对PSRCW结构性能影响不明显;同时,为了避免抗剪连接件疲劳断裂,建议内填墙采用低强度等级的混凝土,或采用U形弯筋或槽钢连接件。在设计荷载水平,内填墙分担80%水平剪力,钢框架分担60%的倾覆力矩。

Based on a low cyclic loading test, the local performances of three one-bay, two-story partially-restrained steel frame with RC infill walls （ PSRCW）, including the failure mode and deformation capacity of the partially restrained connections, the infill walls and the slip between the steel frames and the infill walls and the force distribution in the structural system, were studied. The results indicate that the infill wall greatly increased the structural stiffness and reduced the rotation capacity of the partially restrained connections. If the fatigue fracture of the shear connectors can be avoided, the types of shear connectors did not have obvious effects on the behavior of the PSRCW. In order to avoid fatigue fracture of the shear connectors, it was suggested to use low grade concrete infill walls and to employ U-shaped deformed bars or channel connectors. The infill wall bore approximately 80% of the overall lateral load, and the steel frame took about 60% of the overall overturning moment.