不同连接方式砌体填充墙钢筋混凝土框架抗震性能试验研究

Experimental study on seismic performance of masonry infilled RC frame with different types of connections

填充墙的构造形式对框架结构的抗震性能影响较大。试验设计了7榀足尺的单层单跨钢筋混凝土框架,其中6榀为带加气混凝土砌块填充墙框架,1榀为空框架,对其进行低周反复荷载作用下的抗震性能试验。填充墙与框架的连接方式采用柔性连接和刚性连接两种。柔性连接填充墙的变化参数主要包括构造柱的构造形式和数量、框架柱中拉结筋的设置与否和填充墙上设置竖向缝的数量。分析了不同填充墙构造形式框架的破坏特征、荷载-位移滞回曲线、骨架曲线、位移延性系数、刚度退化、耗能能力。结果表明:柔性连接填充墙框架的抗震性能介于刚性连接填充墙框架和空框架之间;对于柔性连接填充墙框架,填充墙的构造措施对框架结构的抗震性能有一定的影响,但影响不大。

The constructional details of infilling walls have significant effects on the seismic performance of RC frames. In this study, seven full-scale, one-bay and one-story RC frame specimens, including one bare frame without infilling wails and six infilled frames, where five infilling masonry walls were with flexible connections and one with rigid connection, were tested under low-cycle reversed loads. For the specimens with flexible connections, the variable parameters were the type and amount of constructional column, the existence of tie steel bars in the columns, and the amount of vertical slit set in the infilling wall. Based on the test results, the damage behavior, force-displacement hysteretic curves and skeleton curves, displacement ductility, stiffness degradation, and energy-dissipation capacity of the specimens were analyzed. The following conclusions can be drawn： the seismic performance of the masonry wall infilled RC frame with flexible connections is between that of the bare frame and the masonry wall infilled RC frame with rigid connections; for the infilled frame with flexible connections, the constructional details of the infilling wall have insignificant effects on the seismic performance of the RC frame.