高轴压比钢管混凝土剪力墙抗震性能试验研究

Experimental study on seismic behavior of steel tube-reinforced concrete composite shear walls with high axial compressive load ratio

为研究约束边缘构件内配置圆钢管的钢管混凝土剪力墙的抗震性能、探讨钢管混凝土剪力墙的轴压比限值及其约束边缘构件的配箍要求,完成了6个剪跨比大于2.0的高轴压比钢管混凝土剪力墙试件和1个钢筋混凝土剪力墙试件的拟静力试验。试验结果表明:剪力墙的破坏形态为压弯破坏及底部混凝土压溃而丧失竖向承载能力;钢管混凝土剪力墙的开裂水平力、名义屈服水平力、正截面受弯承载力和变形能力均比相同参数的钢筋混凝土剪力墙大;配置双钢管剪力墙的变形能力大于配置单钢管的剪力墙,约束边缘构件为端柱的剪力墙的变形能力大于约束边缘构件为暗柱的剪力墙;正截面受弯承载力试验值大于计算值。根据试验结果,提出了钢管混凝土剪力墙的设计建议。

To study seismic behavior of shear walls with circular steel tubes embedded in the confined boundary elements, and to investigate the limit value of axial compressive load ratio and the stirrup requirements in the confined boundary elements, quasi-static tests on six steel tube-reinforced concrete （ST-RC） composite shear wall specimens and one reinforced concrete （RC） shear wall specimen were conducted. All the specimens had an shear-span ratio greater than 2.0 and subjected to a high axial compressive load. The test results indicate that the failure mode of the specimens is the axial-flexural failure, with crushing of toe concrete and losing of vertical load bearing capacity. The crack load, nominal yield load, flexural strength and deformation capacity of the ST-RC composite shear wall specimens are larger than those of the RC shear wall specimen with the same parameters. The deformation capacity of the specimen with double steel tubes is greater than that of the specimens with a single steel tube in each boundary element. The ST-RC composite shear wall specimen with end columns has larger ultimate lateral displacement comparing with rectangle sectional specimens. The measured flexural strength is larger than the calculated value. On the basis of the experimental results, design recommendations are proposed for ST-RC composite shear walls.