再生混凝土空心砌块填充墙-型钢再生混凝土框架结构抗震性能试验研究

通过对4榀1/2.5比例单层单跨再生混凝土空心砌块填充墙-型钢再生混凝土框架结构的抗震性能试验，研究了填充墙砌块强度、轴压比以及墙体拉筋间距等对该结构抗震性能的影响。分析了试件的破坏形态、滞回曲线及骨架曲线、承载力、层间位移角、位移延性、耗能能力以及刚度退化。结果表明：再生混凝土空心砌块填充墙-型钢再生混凝土框架结构中墙体部分先于框架部分破坏，且框架的破坏机制符合“梁铰机制”，滞回曲线较为饱满，耗能能力良好，具有较强的抗倒塌能力；随着填充墙砌块强度的降低，结构承载力下降，位移延性系数增大，初始刚度减小且刚度退化速率降低，结构破坏时层间位移角和等效黏滞阻尼系数增大；增大轴压比使结构承载力提高，位移延性系数下降，初始刚度明显提高且刚度退化速率上升，结构破坏时层间位移角以及等效黏滞阻尼系数均略有降低；减小墙体拉筋间距使结构承载力及位移延性有所提高，初始刚度增加，但刚度退化速率基本不变，结构破坏时层间位移角及等效黏滞阻尼系数均增大。

Experimental study on seismic behavior of steel reinforcedrecycled aggregate concrete frame infilled with recycled aggregate concrete hollow blocks

Based on the experimental study on four 1/2.5 scaled model of one-bay and one-story steel reinforced recycled aggregate concrete frames infilled with recycled aggregate concrete hollow blocks under low cyclic reversed loading, the effects of masonry strength, axial compression ratio and lacing rebar spacing on seismic behaviors of specimens were investigated. The failure mode of the structure, load-displacement hysteretic loops and skeleton curves, load carrying capacity, inter-story drift ratio, displacement ductility, energy dissipation and stiffness degradation were analyzed. The results indicate that infilling walls fail earlier than frames. The failure mechanism is the beam-hinged mechanism. The hysteretic loops are in a plump-shape. And the capacity of energy dissipation is better. With the decrease of infilling blocks strength, the load carrying capacity decreases, displacement ductility increases, initial stiffness decreases and the stiffness degradation turns slow. The inter-story drift ratio and equivalent viscous damping coefficients increase at failure point. With the increase of axial compression ratio, the load carrying capacity increases, displacement ductility decreases, initial stiffness increases obviously and the stiffness degradation turns fast. The inter-story drift ratio and energy dissipation decrease at failure point. With the decrease of lacing rebar spacing, the load carrying capacity and displacement ductility increase slightly, initial stiffness increases but the stiffness degradation speed keeps almost constant, and the inter-story drift ratio and energy dissipation increase at failure point.