低配筋带缝冗余剪力墙的抗震试验研究

Seismic experimental study on under-reinforced redundant shear wall with joint

充足的冗余性能可以为剪力墙在地震作用下提供多道抗震防线,提高其抵御地震作用的能力。为研究冗余剪力墙的抗震性能,设计2个低配筋带缝冗余剪力墙试件,一个试件含有单排配筋混凝土墙肢,一个试件含有配筋砌体墙肢,进行低周反复荷载试验。分析研究试件的破坏过程和破坏机理、滞回特性、强度衰减、刚度退化和耗能能力。试验结果表明,2个低配筋带缝冗余剪力墙受力破坏时都有明显的层次性,在墙体薄弱部分破坏后剩余结构能继续承载,表现出较好的冗余特性,且单排配筋混凝土带缝冗余剪力墙同配筋砌体带缝冗余剪力墙相比,滞回环更为饱满,具有更好的耗能能力和后期承载性能,抗震性能更好。

Sufficient redundancy may provide shear wall with multiple seismic fortification lines,and enhance its ability to resist seismic actions. To investigate the seismic performance of redundant shear wall,two under-reinforced specimens with joint are designed in this work,one is combined with single-layer reinforced RC wall,and the other is combined with reinforced concrete masonry wall. The failure pattern and failure mechanism,hysteretic property,attenuation process,stiffness degradation and energy dissipation are analyzed through low-cycle loading test. Test results show that there is an obvious hierarchical characteristic in the failure process for both specimens,and the residual structure can still bear additional loads after weak portion of wall fails,reflecting their good redundancy performances. The seismic performance of the specimen combined with single-layer reinforced RC wall may outperform the specimen combined with reinforced concrete masonry wall,due to its better energy dissipation and post bearing capacity.