端柱配置HRB600箍筋剪力墙的抗震性能试验研究

Experimental study on seismic behavior of shear wall with HRB600 stirrups in end column

为了研究HRB600高强箍筋用于剪力墙边缘约束构件(端柱)对剪力墙抗震性能的影响,对4片端柱配有HRB600高强箍筋的混凝土剪力墙进行拟静力试验,研究了各试件的破坏形态、滞回曲线、骨架曲线、承载能力、延性、变形能力、刚度退化、耗能能力及顶点位移角等。结果表明,随着剪跨比的降低,剪力墙由弯曲破坏向弯剪破坏转变,承载力和早期刚度有所提高,但变形能力和耗能能力降低;对于高剪跨比的试件,端柱配置HRB600箍筋对剪力墙的承载力、延性和耗能能力有一定提高。对于低剪跨比的试件,端柱配置HRB600箍筋不能提高其抗震性能;用顶点位移角限值作为端柱配有HRB600高强箍筋的剪力墙的性能指标,可以较好地反映其性能水平与损伤程度之间的关系。

In order to study the effect of HRB600 high-strength stirrups in end columns on seismic performance of shear walls, quasi-static tests were carried out on four concrete shear walls with HRB600 high-strength stirrups in end columns. The failure modes, hysteretic curves, skeleton curves, bearing capacity, ductility, deformation capacity, stiffness degradation, energy dissipation capacity and peak displacement angle of each specimen were studied. The results show that with the decrease of shear-span ratio, the shear wall changes from bending failure to bending-shear failure, and the bearing capacity and early stiffness are improved, but the deformation capacity and energy dissipation capacity are reduced. For high shear-span ratio specimens, the bearing capacity, ductility and energy dissipation capacity of the shear wall are improved by using HRB600 stirrups in end columns. For the specimens with low shear span ratio, HRB600 stirrups can not improve their seismic performance. The limit of vertex displacement angle is used as the performance index of the shear wall with HRB600 high strength stirrup in end column, which can better reflect the relationship between its performance level and damage degree.