工字形钢筋混凝土剪力墙变形指标试验研究

Experimental study on deformation index limits of I-shaped shear walls

根据我国现行规范要求,设计20个工字形RC剪力墙试件进行低周往复试验,各片墙体的主要变化参数为剪跨比、边缘构件的纵筋配筋率、设计轴压比,对其破坏形态、滞回特性、位移延性进行研究。根据试验结果,分别采用基于骨架曲线和基于试验现象的方法给出20个试件在完好、轻微损坏、轻中等破坏、中等破坏、较严重破坏、严重破坏6个性能状态对应的变形限值,最后,对比同批20个矩形RC剪力墙的试验结果,分析翼缘对RC剪力墙构件变形限值的影响。结果表明,基于骨架曲线划分得到的性能状态具有明确的破坏现象,是合理的;设置翼缘的工字形剪力墙的变形能力强于矩形剪力墙。

Based on the requirements of current codes, twenty I-shaped shear walls were designed and tested under low frequency cyclic loading. The variaion parameters for each wall were shear-span ratios, longitudinal reinforment ratios of boundary element and axial compression ratios. Seismic behaviors, such as failure pattern, hysteretic characteristics, displacement ductility, were investigated. According to the test results, deformation limits of six performance states were determined in two ways based on the skeleton curve and testing phenomena. The effect of flanges on the deformation capacity was studied by comparing the deformation limits between twenty rectangular shear walls and I-shaped shear walls. The results show that the performance states divided based on the skeleton curve is reasonable because each performance state has definite damage phenomena. It is also proved that the deformation capacity of shear wall with flanges is better than that of rectangular shear walls.