装配式部分包覆钢-混凝土组合剪力墙抗震性能试验研究

Experimental study on seismic behavior of prefabricated partially encased composite shear walls

为研究装配式部分包覆钢-混凝土组合剪力墙(简称“装配式PEC剪力墙”)的抗震性能,完成了3个短肢剪力墙和4个一般剪力墙的低周反复加载试验,观察装配式部分包覆钢-混凝土组合剪力墙在水平循环荷载下的破坏全过程,并分析该类剪力墙的滞回性能、承载力、变形能力、刚度退化和耗能能力。研究表明:组合剪力墙破坏时均表现为典型的压弯破坏,滞回曲线较为饱满,耗能性能良好;对于短肢剪力墙,随着区格数量的减少,承载力和延性随之降低;对于一般剪力墙,区格数量、增设纵筋和腹板开孔等构造措施对承载力和延性影响不大;极限层间位移角范围为1/83~1/56,基本满足罕遇地震下对组合剪力墙层间位移角限值的要求,说明装配式部分包覆钢-混凝土组合剪力墙具有良好的变形能力。同时,建立有限元模型,由有限元分析所得滞回曲线、骨架曲线与试验结果吻合,破坏模式一致,表明有限元模型合理可靠,可为后续PEC剪力墙参数分析提供依据。

To study the seismic behavior of prefabricated partially encased composite(PEC) shear walls, three short-leg shear walls and four general shear walls were prepared and tested under low-cycle reversed loadings. The whole failure process of the prefabricated partially encased composite shear walls was observed, and the hysteretic performance, bearing capacity, deformability, stiffness degradation and energy dissipation capacity were analyzed. The test results show that the specimens experience typical compression-bending failure. The hysteretic curves are full, and the energy dissipation capacity is good. For short-leg shear walls, as the number of cells decreases, the bearing capacity and ductility of the specimen decrease accordingly. For general shear walls, the number of cells and the structural measures including the addition of longitudinal reinforcements and the use of perforated web have little effect on the bearing capacity and ductility. The range of the ultimate displacement angle is 1/83-1/56, which exceeds the code limit under rare earthquakes, indicating that the prefabricated partially encased composite shear walls have good deformability. The finite element model was established. The failure mode, hysteresis curves and skeleton curves obtained from the finite element model are all consistent with the test results. The finite element model is reasonable and reliable, which can be used for the parametric analysis of PEC shear walls.