MRPC不同加固方式下砌体墙抗震性能试验研究

设计了6片高宽比1∶1.5、砂浆强度低于M2.5的砌体墙,通过改性活性粉末(MRPC)双面加固、单面加固、剪刀撑式加固、门式加固、井格式加固以及未加固墙体的拟静力试验,对于不同加固方式下墙体的破坏模式、承载力特征、延性变形及耗能能力等抗震性能进行对比分析。结果表明:1)采用MRPC不同加固方式均可改善墙体的脆性破坏模式,提高墙体的承载力、耗能能力;2)墙体承载力可提高20.34%~167.62%,其中双面加固效果最优,剪刀撑式加固次之;3)墙体位移延性系数为未加固墙体的2倍以上,墙体滞回环面积有近7倍的提升,能量耗散系数增大2倍;4)对比各加固方式下墙体抗震性能,双面加固效果最优,单面加固与剪刀撑式加固效果次之,均优于井格式加固、门式加固。

Experimental study on seismic performance of masonry wall under different reinforcement methods of MRPC

Six masonry walls with height width ratio of 1∶1.5 and mortar strength lower than M2.5 were designed. The quasi-static tests were conducted on modified reactive powder concrete(MRPC) double-sided reinforcement, single-sided reinforcement, scissor brace reinforcement, portal reinforcement, well pattern reinforcement and unreinforced walls to study and compare the seismic performance of the walls under different reinforcement modes, such as failure mode, bearing capacity characteristics, ductility deformation and energy consumption capacity. The results show that: 1) different reinforcement methods of MRPC can improve the brittle failure mode of the wall, and improve the bearing capacity and energy dissipation capacity of the wall;2) the bearing capacity of the wall can be increased by 20.34%~167.62%, among which the double-sided reinforcement effect is the best, followed by the scissor brace reinforcement;3) the displacement ductility coefficient of the wall is more than 2 times of the unreinforced wall, and the area of the wall hysteresis loop is nearly 7 times higher, and the energy dissipation coefficient is nearly 2 times higher;4) the seismic performance of the walls under different reinforcement methods were compared to conclude that the effect of double-sided reinforcement is the best, and the effect of single-sided reinforcement and scissor brace reinforcement is the second, which are better than well pattern reinforcement and portal reinforcement.