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考虑了砂浆强度等级、开洞率和高宽比3种因素,对3层砌体房屋的底层墙进行抗震性能的伪静力试验.分析了破坏形态、滞回耗能、抗震承载力、刚度退化和墙体侧移情况.结果表明,砂浆强度等级和高宽比对破坏形态的影响类似,而开洞率稍有不同;砂浆强度等级愈低、开洞率愈大或高宽比愈大时,墙体的耗能能力及抗震承载力愈小,其中开洞率的影响更为显著.开裂前,各因素下刚度退化均较快,且趋势一致;开裂后,开洞率大的试件刚度退化最快;达到极限荷载时,各因素下的刚度退化较大,为初始刚度的20%左右.开裂后,开洞率大的墙肢薄弱,墙高方向的侧移分布曲线明显外凸.
Taking the mortar strength grade, hole opening ratio and aspect ratio into consideration, the quasi-static tests on the seismic performance of the bottom wall of the 3-story masonry building are carried out. The failure modes, hysteretic energy dissipation, The results show that the influence of mortar strength grade and aspect ratio on the failure morphology is similar but the hole opening rate is slightly different. The lower the mortar strength grade, the greater the hole opening rate or the greater the aspect ratio , The smaller the energy dissipation capacity and the bearing capacity of the wall are, the more obvious the effect of hole opening rate is.The wall stiffness degenerates quickly and has the same trend before cracking, and after cracking, When the ultimate load is reached, the stiffness degenerate greatly, which is about 20% of initial stiffness.When cracked, the wall members with large opening rate are weak and the lateral displacement distribution curve in the wall height direction is obviously Convex.