钢筋混凝土剪力墙拉剪性能试验研究

Experimental study on tension-shear performance of reinforced concrete shear wall

完成了2组剪跨比为1.5、截面纵筋率分别为1.7%和2.5%、轴拉力不同的11片钢筋混凝土剪力墙拉剪性能试验。在拉力和剪力的共同作用下,因两者相对大小不同,剪力墙分别处于大偏心受拉、小偏心受拉两种状态,破坏时分别表现为剪压破坏、滑移破坏两种模式。试验结果表明,轴拉力和截面纵筋率对剪力墙的抗剪承载力、水平抗侧刚度和累积滞回耗能等抗震性能的影响是相反的,当轴拉力增加时它们减小,当截面纵筋率提高时它们提高;与压剪破坏相比,拉剪剪力墙的极限变形能力有所提高,延性加大;截纵筋率提高了剪力墙的变形能力;剪力墙等效黏滞阻尼系数当轴拉力增加时增大,当截面纵筋率增加时降低。

In two groups with sectional longitudinal reinforcement ratios of 1. 7% and 2. 5% respectively, eleven specimens of＇ shear wall with shear-span ratio of 1.5 and with different axial tensions were tested for their tension-shear performances. Under the combined actions of tensile force and shear force and depending on the relative magnitude of the two forces, shear walls may be in the tension state of large eccentricity or in the tension state of small eccentricity, which leads to the shear-compression failure mode or the slip failure mode, respectively. The test results show that the influences of axial tension and sectional longitudinal reinforcement ratio on the shear capacity, lateral stiffness and cumulative hysteretie energy of shear wall were opposite. That is, these performances may be decreased with the increase of tensile force, and be increased with the increase of sectional longitudinal reinforcement ratio. Compared with the compression-shear failure, the ultimate deformation capacity and the ductility of shear wall may be increased under the tension-shear action. The deformation capacity of shear wall may be increased with the increase of sectional longitudinal reinforcement ratio. The equivalent viscous damping coefficient of shear wall may be increased with the increase of tensile force, and be decreased with the increase of sectional longitudinal reinforcement ratio.