斜筋对大洞口率单排配筋双肢墙的抗震性能影响研究

Study on the effect of inclined reinforcements on seismic performance of RC coupled shear walls with single row of steel bars and large opening rate

单排配筋混凝土剪力墙易在基底施工缝处发生剪切滑移,影响其抗震性能。为了解在剪力墙底部配置斜向钢筋对大洞口率单排配筋混凝土双肢墙的抗震性能影响,对1个底部配置斜筋的双肢墙和1个未配置斜筋的双肢墙进行了低周反复荷载试验,并用ABAQUS有限元软件进行了数值模拟分析,研究了试验模型的破坏特征、滞回性能、承载力、延性、刚度和耗能能力。结果表明:对于洞口率较大的单排配筋混凝土双肢墙,在保持墙肢总配筋量不变条件下,墙肢底部适当配置斜向钢筋可限制其剪切变形发展,避免墙肢底部施工缝处发生剪切滑移现象,对双肢墙的延性和耗能能力有一定的提高作用。

The shear-slip is easy to occur at the bottom of construction joint of the concrete shear walls with single row of reinforcements,which will weaken their seismic behavior. In order to investigate the effect of inclined reinforcement configured on the bottom of the shear wall limbs,on the seismic behavior of coupled shear wall with large hole and single row of reinforcements,the tests on coupled shear walls with inclined reinforcements and without them subjected to lowcycle reversed loading were carried out. The failure characteristic,hysteretic property,load-carrying and deformation capacity,stiffness,energy dissipation were comparatively analyzed. And the finite element analysis for the seismic behavior of test specimens was performed by using ABAQUS program. The study results show that when the total amount of reinforcement of the shear wall limbs is constant,using inclined reinforcements on the bottom of coupled shear wall with large opening can limit the development of shear deformation. It was observed that the inclined reinforcements reduced the shear-slip at the bottom of construction joints of shear wall limbs,thus the ductility and energy dissipation capacity of coupled shear wall were improved.