高轴压比双层钢板-高强混凝土组合剪力墙抗震性能试验研究

为研究高轴压比下双层钢板-高强混凝土组合剪力墙的抗震性能, 对4个剪跨比为2.5的试件进行了拟静力加载试验。通过改变约束拉杆和加劲肋的间距, 研究其在往复水平荷载作用下的破坏机理、滞回性能、变形能力以及耗能能力。试验结果表明, 这种剪力墙的破坏形态为墙底部截面钢板被压曲、核心混凝土被压碎的弯曲型破坏;试件的滞回曲线饱满, 没有明显的捏缩现象;位移延性系数在3.11~4.37, 等效粘滞阻尼比在0.158~0.291, 延性系数和耗能指标均满足结构抗震设计要求。在轴压比相同条件下, 设置加劲肋试件的抗震性能优于设置约束拉杆的试件, 随着约束拉杆和加劲肋间距的减小, 试件的变形能力增加, 表现出较好的耗能能力。

EXPERIMENTAL INVESTIGATION ON ASEISMIC BEHAVIOR OF DUAL STEEL HIGH STRENGTH CONCRETE SHEAR WALLS WITH HIGH AXIAL LOAD RATIO

In order to research the aseismic behavior of dual steel high strength concrete (DSHSC) shear walls, a quasi-static test for four specimens was carried out. The shear-span ratio of all specimens was 2.5. The failure mechanism, hysteretic behavior, deformability and energy dissipation capacity under a cyclic lateral load were analyzed by changing the space of binding bars and stiffeners. The results showed that two failure models of the wall were the buckling of the steel tube and the crash of core concrete at the base of the specimens. All of the DSHSC structural walls had plump hysteretic curves and no significant pinch phenomenon. The displacement ductility coefficient varied from 3.11 to 4.37. The equivalent viscous damping ratio ranged from 0.158 to 0.291. Both ductility coefficient and equivalent viscous damping ratio can satisfy requirements of aseismic design. Under same axial compression ratio, the specimens with stiffeners show a better aseismic performance than the ones with binding bars. The deformability of the specimen was significantly improved when the space of stiffeners and binding bars decreased, and the specimens showed a good energy dissipation capacity.