配置斜筋单排配筋混凝土双肢剪力墙抗震性能试验研究

Experimental study on seismic behavior of RC coupled shear walls with single row of steel bars and inclined reinforcement

在水平地震作用下,低轴压比的单排配筋混凝土剪力墙易在底部施工缝处产生剪切滑移现象,影响其耗能能力,在剪力墙底部配置斜向钢筋可以较好地避免此现象发生。为研究配置斜筋单排配筋混凝土双肢剪力墙的抗震性能,对3个1/2缩尺的单排配筋混凝土双肢剪力墙进行了拟静力试验,研究了在墙肢及连梁中配置斜筋对混凝土双肢剪力墙破坏机制与抗震性能的影响。对比分析了配置斜筋双肢墙与未配置斜筋双肢墙的破坏形态、滞回特性、承载力、延性、刚度和耗能能力。试验结果表明:在墙肢配筋量相同的条件下,在墙肢底部设置适量的斜筋,可提高双肢墙的延性和耗能能力,并对其破坏机制产生影响;在墙肢分布钢筋量不变条件下,在墙肢底部和连梁中增设斜筋,可明显提高双肢墙的延性和耗能能力。

The shear-slip is easy to occur at the bottom construction joint of the shear wall with single row of steel bars when it is subjected to horizontal earthquake action under low axial compression ratio. The shear-slip will decrease the energy dissipation capacity of the shear wall. The phenomenon can be avoided successfully by setting some inclined reinforcement on the bottom of the shear wall. In order to investigate the effect of inclined reinforcement,placed in the shear wall limbs and coupling beam,on the failure mechanism and seismic behavior of RC coupled shear walls with single row of steel bars,three 1 /2 scaled models subjected to low-cycle reversed loading were tested. Comparative analysis on failure modes,hysteresis property,load-carrying capacity,ductility,stiffness and energy dissipation capacity between specimens with inclined reinforcement and normal specimen was carried out. The results show that when the total amount of reinforcement of the shear wall limbs is constant,setting inclined reinforcement on the bottom of shear wall limbs not only can increase the ductility and energy dissipation of shear wall,but also has an influence on its failure mechanism. When the amount of web reinforcement of the shear wall limbs is constant,adding inclined reinforcement on the bottom of shear wall limbs and coupling beam will obviously improve the ductility and energy dissipation capacity of the shear wall.