双钢板-混凝土短肢组合剪力墙抗震性能试验

Experimental Investigation on Seismic Behavior of ShortLeg SteelConcreteSteel Composite Shear Walls

摘要:

对4个双钢板混凝土短肢组合剪力墙试件进行了试验，考虑了单调、循环两种加载方式以及1.0、2.0两种剪跨比，研究了该类墙体的破坏模式、延性、刚度、承载力、耗能等抗震性能指标.试验结果表明：组合剪力墙在加载过程中经历了混凝土的开裂和压溃、钢板的屈曲和屈服甚至断裂，其破坏模式属于典型的弯曲控制型破坏；组合剪力墙的位移延性系数均超过3.0，试件具有较好的变形能力；剪跨比为2.0的组合剪力墙具有更好的延性；循环加载组合剪力墙表面钢板的屈曲和混凝土的严重损伤，致使其耗能较差；循环加载组合剪力墙的极限荷载、延性系数较单调加载组合剪力墙均降低10%以上.提出限制表面钢板屈曲的优化建议.

Abstract:

Four shortleg steelconcretesteel composite shear wall specimens with shearspan ratio of 1.0 and 2.0 under monotonic and cyclic loading, were designed to investigate their failure mode, ductility, stiffness, loadbearing capacity and energy dissipation. The experimental results indicated that four composite walls failed in a flexuredominated mode, undergoing concrete cracking, steel faceplate buckling and yielding, concrete crushing, steel faceplate fracture. The composite walls showed good deformation capacity with ductility coefficient more than 3.0. The wall with shearspan ratio of 2.0 had better ductility than the wall with shearspan ratio of 1.0. Compared with the wall under monotonic loading，the loadbearing capacity and ductility coefficient for the wall under cyclic loading were reduced by more than 10%. The wall under cyclic loading showed severer buckling of steel faceplates and damage of concrete, which reduced its energy dissipation. Structural measures to prevent buckling of steel faceplates are discussed.