不同填充墙布置的型钢再生混凝土框架抗震性能试验分析

Experimental analysis on seismic performance of steel reinforced recycled aggregate concrete frame with different hollow-block infilled walls

进行了4榀单层单跨型钢再生混凝土框架-再生混凝土空心砌块填充墙试件的拟静力加载试验,对不同填充墙布置及墙体宽高比试件的破坏形态、承载力、层间位移角、耗能能力以及刚度退化等力学特性进行了分析.结果表明:填充墙的存在提高了框架结构的承载力及抗侧刚度;墙体半高填砌的框架,其峰值荷载、初始抗侧刚度均介于空框架与全高填充墙框架之间,其极限层间位移角、延性及耗能能力与空框架试验结果较为接近;墙体全高填砌的框架,其极限层间位移角及位移延性与空框架相比有所减小,但等效黏滞阻尼系数较大;随着墙体宽高比的增大,结构承载力有所提高,位移延性呈下降趋势,耗能能力变化不明显;填充墙框架的刚度退化率均高于空框架,墙体全高填砌框架的刚度退化率大于墙体半高填砌框架,且墙体宽高比越大,刚度退化率越大.

According to four one-bay and one-story steel reinforced recycled aggregate concrete frames which were tested under low cyclic reversed loading, the effects of hollow-block infilled wall with different infill configurations and width-height ratio on the failure mode of the structure, load bearing capacity, inter-story displacement angle, energy dissipation and stiffness degradation were analyzed. The results show that the infilled walls may enhance the load carrying capacity and lateral stiffness. The maximum load and initial lateral stiffness of the frame with half-height infilled wall are between those of bare frame and those of frame with all-height infilled wall, and its ultimate inter-story drift ratio, displacement ductility and energy dissipation are close to those of the bare frame. Compared to bare frame, the frame with all-height infilled wall has the smaller ultimate inter-story drift ratio and displacement ductility, and bigger equivalent viscous damping coefficient. The load carrying capacity increases with larger width-height ratio, while the displacement ductility decreases, but the energy dissipation keeps almost constant. The speed of stiffness degradation of frames with infilled wall is higher than that of bare frame; the speed of stiffness degradation of frame with all-height infilled wall is higher than that of frame with half-height infilled wall, and the stiffness degradation is more significant the width-height ratio of infilled wall increases.