多层砌体填充墙框架结构抗震性能试验研究

为了研究砌体填充墙沿框架层不连续布置对框架结构抗震性能的影响，进行了3榀两层单跨砌体填充墙框架结构模型、1榀单层单跨砌体填充墙框架结构模型、1榀两层单跨框架结构模型和1榀单层单跨框架结构模型的对比试验，分析了各试件的破坏特征、滞回曲线、骨架曲线、位移延性、刚度退化、承载力退化和耗能性能等抗震性能指标。结果表明：无论是单层单跨还是两层单跨的砌体填充墙框架结构，其水平峰值荷载和初始刚度比相应的纯框架结构均有较大幅度的提高，且其刚度退化程度比相应纯框架结构要缓慢；砌体填充墙的存在提高了框架结构的抗侧刚度和水平峰值荷载，使框架结构的变形由剪切型逐渐转变为弯剪型；砌体填充墙参与了结构的滞回耗能，填充墙框架的位移延性和累积耗能能力明显优于框架；砌体填充墙沿框架层不连续布置会引起框架结构层间侧移刚度和层间受剪承载力发生突变，影响框架结构的破坏形态，但由于砌体填充墙参与了框架结构的滞回耗能，故其仍具有较好的抗震性能。

Experimental study on seismic behavior of multi-story masonry infilled reinforced concrete frame structures

In order to study the effects of masonry infill wall discontinuous arrangement on the seismic behavior of multi-story frame structures，comparison tests of three two-story single bay masonry infilled frame structure, one single story single bay masonry infilled frame structure and one two-story single bay frame structure，one single story single bay frame structure subjected to low cyclic reversed load were carried out. The damage characteristics, load-displacement hysteretic loops, skeleton curves, bearing capacity, displacement ductility, rigidity degradation, strength degradation and energy dissipation were analyzed. The test results indicate that whether it is a single story single bay or a two-story single bay masonry infilled reinforced concrete frame structure，their bearing capacity and initial rigidity are raised significantly than the corresponding bare frame structure，and their rigidity degradation degree are slower than the corresponding bare frame structure. The masonary infill wall enhances the lateral stiffness and peak load of the frame structures, and makes the lateral displacement curves of the frame structure gradually change from shear type into bending shear type. Due to the contribution of the masonry infill wall, the displacement ductility and cumulative energy dissipation capacity of masonry infilled frame is better than those of the bare frame. The discontinuous arrangement of masonry infill walls along the frame make the story lateral stiffness and shear capacity change abruptly, and affects the failure modes of infilled reinforced concrete frames. However, since the masonry infill wall participates in the structural hysteretic energy dissipation，the masonry infilled frame has better seismic behavior than that of the frame structure.