低烈度区低、多层住宅低配筋剪力墙抗震性能试验

Experiments on seismic behaviors of low reinforcement of low-story,multi-storey residential shear walls in low intensity regions

在低烈度的低、多层混凝土剪力墙结构中,是否可以采用比现行规范规定的墙体和边缘构件构造配筋更低要求的配筋形式,是目前低烈度区低、多层剪力墙结构设计需要解决的问题。通过7个低配筋剪力墙试件的低周反复加载试验,从破坏模式、延性、承载力、刚度、耗能能力、滞回性能等方面对低烈度区采用适合低、多层住宅结构的低配筋剪力墙试件的工作性能进行评价。试验的变化参数为截面形式、边缘构件纵筋配筋率、边缘构件箍筋配箍率、墙体腹板水平及竖向分布钢筋配筋率。通过对试验结果的对比分析,在低烈度区的低、多层剪力墙结构中,能够采用经过合理设计的低配筋剪力墙。

In the design field of low-story,multi-story RC shear wall structures in low-intensity regions,the ratio of longitudinal reinforcing steel bar of shear walls and the edge members is set as the constructional reinforcement ratio according to current codes. From the perspective of optimization,whether lower reinforcement ratios can be applied to lowstory,multi-story RC shear wall structures in the low seismic intensity area needs to be studied. 7 shear wall specimens with low reinforcement ratios were selected as research objects. Section types,longitudinal reinforcement ratios and stirrup ratios of edge members,horizontal and vertical distribution reinforcement ratios of the shear wall webs were selected as parameter variables to make comparative analysis. Through horizontal cyclic loading experiments,the failure mode,ductility,bearing capacity,stiffness,energy dissipation and hysteretic behavior of the specimens were investigated. The test results prove that the seismic behavior of low-story,multi-story RC shear wall structures with low reinforcement ratios by reasonable design is accepted in the low-intensity regions.