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通过在约束边缘构件位置和截面中部设置多根钢管,形成了一组不同钢管布置形式的钢管高强混凝土组合剪力墙。通过对8片剪跨比为2.08的剪力墙试件在高轴压比(0.40~0.62)下的低周往复加载试验,研究其破坏形态、承载力、变形能力、滞回性能等。试验结果表明:试件的破坏形态为压弯作用下的受弯破坏,墙体根部混凝土压溃范围为整个试件宽度和300~400 mm高度,钢管与混凝土之间没有出现明显的黏结滑移;在峰值荷载前,试件的截面应变分布基本符合平截面假定;与钢筋混凝土剪力墙相比,设置钢管后在轴向压力最大增加19%的情况下,受弯承载力提高了21%~43%,试件的屈服位移角达到1/300,峰值荷载时位移角不低于1/100,极限位移角达到1/75,个别试件接近1/40,变形能力提高了约30%,试件的滞回性能明显改善,表明所设计的钢管高强混凝土剪力墙具有良好的抗震性能和抗倒塌能力。
A set of steel-pipe high-strength concrete composite shear walls with different arrangement of steel pipes are formed by setting a plurality of steel pipes in the middle of the constraining edge member and the cross section. The failure modes, bearing capacity, deformation capacity and hysteretic behavior of the shear wall specimens with 8 shear-span ratio of 2.08 under low axial reciprocating loading at high axial compression ratio (0.40-0.62) were studied. The test results show that the failure mode of the specimen is bending failure under pressure and bending. The crushing range of the concrete at the root of the wall is the width of the specimen and the height of 300 ~ 400 mm. There is no obvious slip between the concrete and the pipe ; Before the peak load, the strain distribution of the specimen basically conforms to the assumption of flat section; compared with the reinforced concrete shear wall, the bending capacity increases by 21% when the axial pressure increases 19% ~ 43%, the yield point of the specimen reaches 1/300, the displacement angle of the peak load is not less than 1/100, the limit displacement angle reaches 1/75, the individual specimen is close to 1/40, the deformation ability is increased by about 30% , The hysteretic behavior of the specimen is obviously improved, which shows that the designed high-strength concrete-filled steel tube shear wall has good anti-seismic performance and anti-collapse ability.