地震力作用角度对短肢剪力墙抗震性能的影响

The Influence of Loading Angle on the Seismic Performance of RC Short-leg Shear Walls

通过低周反复试验研究了加载角度对"一"字形截面钢筋混凝土短肢剪力墙抗震性能的影响,加载角度为0°,25°,45°。记录了试件由开裂、屈服到破坏的整个过程,观察到不同角度加载造成的剪力墙不同的破坏模式,可以发现,短肢墙的破坏形式由弯剪破坏到弯曲破坏变化。定量分析试件的恢复力曲线(即滞回曲线和骨架曲线)、延性、耗能能力等指标发现,随着加载角度的增大,构件的极限承载力变小,极限位移、延性、耗能能力增大。

The influence of loading angle on the seismic performance of I-shaped reinforced concrete （RC） short-leg shear wall was studied through experiments. Three RC short-leg shear walls were subjected to cyclic loads, which were applied with the angles of 0 degree, 25 degree and 45 degree to the in-plane direction of shear walls, respectively. The whole process of members from cracking, rebar yielding to failure was described in this paper. It was noted that the failure pattern of short-leg shear wall was changed from shear and bending combined failures to mere bending failure. The indexes, such as hysteretic curves, ductility, and energy dissi- pation ability were analyzed quantificationally. With the increase of load angle, the value of peak strength dropped, while the ultimate displacement, ductility and energy dissipation ability showed an increasing trend.