型钢再生混凝土框架-再生砌块填充墙结构恢复力模型试验研究

对7榀1/2.5比例单层单跨型钢再生混凝土框架-再生砌块填充墙模型进行低周反复荷载作用下的抗震性能试验研究，分析了墙体设置形式、填充墙砌块强度、拉筋构造形式、轴压比以及墙体宽高比等设计参数对该种结构抗震性能的影响。研究了模型的典型破坏形态、荷载-位移曲线、承载能力以及位移延性等。结果表明：试验模型的典型破坏形态均符合“强柱弱梁”的破坏模式，框架部分的破坏程度随墙体全高填砌而减轻；在框架中加设墙体后可明显提高结构承载力和初始刚度，墙体填充率越大、填充墙砌块强度越高、拉筋间距越小、轴压比越高、墙体宽高比越大，结构承载力与初始刚度提高越明显；结构的位移延性均值达到6.26，高于钢筋再生混凝土框架-填充墙、普通钢筋混凝土框架-填充墙以及钢筋混凝土异形柱框架-填充墙等结构，抗倒塌能力较强。在试验研究的基础上，通过有限元与试验结合的方法，建立了相应的四折线恢复力模型，可用于型钢再生混凝土框架结构的弹塑性地震反应分析。

EXPERIMENTAL STUDY ON THE RESTORING FORCE MODEL OF STEEL REINFORCED RECYCLED CONCRETE FRAME INFILLED WITH RECYCLED CONCRETE BLOCKS

Based on the experimental study on seven 1/2.5-scaled model of one-bay and one-story steel reinforced recycled concrete frames infilled with recycled concrete blocks under low cyclic reversed loading, the effects of infilled walls' arrangement, masonry material, the vertical spacing of tie bar, axial compression ratio, and the ratio of width to height of infilled wall on seismic behaviors were analyzed. The typical final failure mode, load-displacement curves, load carrying capacity and displacement ductility were also analyzed. The results indicate that the failure mechanism is the beam-hinged mechanism, and the higher filling rate of infilled wall can reduce the damage degree of the whole structure. With the increment of the filling rate of infilled wall, the increase will happen for the infilled blocks strength, the axial compression ratio and the number of tie bar, loading carrying capacity and initial stiffness. The mean value of displacement ductility is 6.26, which shows the strong capacity of resisting collapse. Based on the experimental results, a four segments restoring force model for the structure was proposed, and can provide theoretical foundation for the nonlinear seismic analysis of a steel reinforced recycled concrete frame infilled with recycled concrete blocks.