钢筋混凝土短肢剪力墙抗震性能试验研究

采用1∶2缩尺模型，设计了6个T形短肢剪力墙试件和6个L形短肢剪力墙试件，以及2个T形普通剪力墙试件。通过低周反复加载试验，研究钢筋混凝土短肢剪力墙构件的抗震性能，并与普通剪力墙进行对比。观测了短肢剪力墙受力-变形-损伤-裂缝-屈服-破坏的全过程；分析了短肢剪力墙的破坏特征、滞回曲线、骨架曲线、刚度退化曲线、位移延性及截面变形规律等。研究表明：T形和L形短肢剪力墙试件在水平荷载作用下，强度和刚度退化曲线呈明显的非对称特点；在开裂之后刚度退化较快；在退化过程中刚度退化速度减缓不明显，后期的刚度退化也不趋于稳定; 大偏心破坏范围内，增大轴压比可以提高试件的承载力；延性并不随轴压比一致变化，控制轴压比试件延性才能发挥到最好，减小剪跨比可增大试件延性；翼缘侧受压时的顶点位移比腹板侧受压时的要小；剪力滞后现象比较显著；破坏的主要形式为弯剪破坏；截面积相同时，T形截面比L形截面短肢剪力墙试件的承载力大，抗震性能优良；高厚比为6.5的T形短肢剪力墙试件相比其它高厚比的短肢剪力墙试件综合性能更佳。

Experimental research on seismic performance of reinforced concrete short-leg shear wall

Using 1∶2 reduced scale model, six T-shaped, six L-shaped short-leg shear wall specimens, and two T-shaped ordinary shear wall specimens were designed and constructed. Through the quasi-static test, the seismic performance of concrete short-leg shear wall components was studied and compared with the ordinary shear wall. The whole process of deforming-damaging-cracking-yielding-failure was observed during the test. Damage characteristics, hysteretic curves, skeleton curves, stiffness degradation, displacement ductility and cross-section deformation of the short leg shear wall specimens were discussed. Test results show that under horizontal loads, the strength and stiffness of the T-shaped and L-shaped short-leg shear wall specimens have obviously asymmetric characteristics. Degradation of the stiffness develops quickly after cracking. During the degradation process, the slowing down of the stiffness degradation is not obvious. At the late stage of the testing the stiffness degradation become unstable. Within the range of large eccentric damage, increasing the axial compression ratio can improve the bearing capacity of components. The change of ductility is not consistent with the change of axial compression ratio. The specimens exhibit the best ductile behavior only when the axial compression ratio is well controlled. Top displacement angle is smaller when the inside of the flange is in compression than when the outside of the flange is in compression. The shear lag phenomenon is quite significant. The main failure pattern is due to shear and flexure. The seismic performance of T-shaped short-leg shear wall is better than the L-shaped shot-leg shear walls. Height to thickness ratio of 6.5 in the short-leg shear wall specimens possesses better seismic performance compared with others.