内置轻钢桁架混凝土组合剪力墙抗震性能试验研究

Experimental study on seismic behavior of concrete composite shear walls with lightweight shaped steel truss

将冷弯薄壁型钢桁架配置在普通钢筋混凝土剪力墙中代替钢筋而形成轻钢桁架混凝土组合剪力墙。为研究该类墙体的抗震性能,对两组共6个内置轻钢桁架混凝土组合剪力墙进行拟静力试验,研究轴压比和斜撑体积配钢率对其滞回性能、变形性能、刚度退化以及耗能能力的影响。对比了低矮剪力墙和中高剪力墙的位移延性和耗能能力。结果表明:轴压比对该类剪力墙的变形能力和耗能能力均不利,应予以控制;斜撑体积配钢率对提高低矮墙的延性、耗能能力效果明显,但对承载力的提高作用较小;对中高剪力墙,斜撑体积配钢率的增加,对其耗能能力不利。

The lightweight shaped steel concrete composite shear wall combines the cold-formed and thin-walled steel shapes with conventional concrete wall. In order to investigate the seismic behavior of this type of composite walls,experimental investigations on two groups of six specimens with embedded cold-formed and thin-walled shaped steel were carried out. The influences of axial compression ratio and the steel ratio of diagonal brace on the hysteretic behavior,load-deformation performance,stiffness degradation and energy dissipation of the composite walls were also studied. The ductility and energy dissipation were compared between low-rise and high-rise specimens. The experimental results indicate that the axial compression ratio has negative influences on the deformation and energy dissipation of composite shear walls with embedded cold-formed and thin-walled steel truss,which should be limited in design. The steel ratio of diagonal brace can be increased to improve the ductility and energy dissipation of low-rise composite walls but there is no obvious improvement on the lateral load carrying capacity. For high-rise composite walls,the increase of the steel ratio of diagonal braces can lead to reduced energy dissipation.