钢筋混凝土剪力墙变形性能指标试验研究

为研究矩形截面钢筋混凝土剪力墙变形指标，根据GB 50011—2010《建筑抗震设计规范》设计了20个剪力墙试件进行低周往复荷载试验，研究不同剪跨比、试验轴压比、边缘构件纵筋配筋率对矩形截面剪力墙破坏形态、滞回性能、变形能力的影响。试验结果表明：随着剪跨比减小，剪力墙的破坏形态由弯曲破坏转向剪切破坏；随着试验轴压比增大，剪力墙的延性降低；随着边缘构件纵筋配筋率提高，弯曲破坏剪力墙延性提高，弯剪破坏与剪切破坏剪力墙延性降低。根据试验结果，建立了构件变形-构件损坏程度-构件承载能力的关系，提出了基于骨架曲线和破坏现象两种性能状态划分方法，得到剪力墙的变形性能指标，并将两种方法的结果进行对比，结果表明两者较为吻合，验证了基于骨架曲线划分性能状态方法的合理性与有效性。

Experimental study on deformation performance indexes of RC shear walls

In order to investigate the deformation indexes of rectangular reinforced concrete shear walls, 20 shear walls were designed according to the GB 50011—2010 ‘Code for seismic design of buildings’. The specimens were tested under low frequency cyclic loading to study the influences of different shear span ratios, test axial compression ratios and longitudinal reinforcement ratios of boundary element on the failure pattern, hysteretic characteristic and deformation capacity of the shear walls. The test results show that as the shear span ratio decreases, the failure pattern is changed from flexural failure to shear failure; the ductility decreases when test axial compression ratio increases. With increase in the longitudinal reinforcement ratio of the boundary element, the shear wall with flexural failure has increased ductility, while that with flexural-shear failure or shear failure has decreased ductility. According to the experimental results, the relationship among deformation, extent of damage and bearing capacity of element was established. Subsequently, two methods based on skeleton curve and damage phenomena were introduced to quantify the performance indexes of RC shear walls, and a comparison between the two methods was made. The good agreement of the comparison results demonstrates the validity and efficiency of the proposed method based on skeleton curve.