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通过对1个未开洞的短肢剪力墙和2个开洞直径分别为120,160 mm的短肢剪力墙的低周反复荷载试验,研究洞口大小对短肢剪力墙抗震性能的影响。试验结果表明:随着洞口尺寸的增大,试件的开裂荷载、屈服荷载、极限荷载有所下降,但延性提高,滞回环更加饱满,耗能能力增强,试件越来越接近框架特性;试件的破坏形式均为弯曲破坏,破坏时,腹板端纵筋屈服,翼缘端纵筋偶有屈服,腹板端、翼缘端箍筋均未屈服,腹板端混凝土压碎。
The influence of the hole size on the seismic performance of short-leg shear walls was studied by a low-cycle cyclic loading test on one short-leg shear wall with no holes and two short-shear walls with diameters of 120 and 160 mm respectively. The experimental results show that the cracking load, yield load and ultimate load decrease with the increase of the hole size, but the ductility increases, the hysteresis loop becomes more full, the energy dissipation increases, and the specimen gets closer to the frame characteristics. The failure forms of the specimens were all bent and damaged. When the failure was underway, the web longitudinal reinforcement was allowed to yield and the longitudinal reinforcement of the flange was occasionally yielded. The web end and the flange end stirrups did not yield, and the concrete at the web end was crushed.