为研究冻融大气环境下构造柱-圈梁约束砖砌体墙的抗震性能，利用气候模拟实验室对4片组合单墙片和4片组合双墙片试件进行了加速冻融试验，进而对其进行了拟静力加载试验。试验结果表明：试件在低周反复荷载作用下均表现为剪切破坏，冻融环境对砖砌体组合墙的破坏形态有一定影响；随着冻融循环次数的增加，试件的开裂荷载和极限荷载不断降低，刚度及耗能能力逐渐退化，而开裂位移和极限位移逐渐增加；冻融循环次数相同时，组合双墙片的承载能力、变形能力和耗能能力均高于组合单墙片，其滞回曲线更加饱满，延性系数约为组合单墙片的1.2倍，刚度退化速率明显降低,表明在冻融环境下设置多道构造柱可有效提高砖砌体组合墙的抗震性能。建立了考虑冻融循环作用次数的砖砌体组合墙受剪承载力公式，且计算结果与试验结果吻合较好。
Abstract
In order to study the seismic behaviors of composite walls in the frozen thawing atmosphere, the accelerated corrosion tests for 4 pieces of single span combination walls and 4 pieces double span of combination walls were conducted by applying the technique of artificial climate accelerated Freeze-thaw, and the quasi-static tests were carried out. The results showed that specimens were identified for shear failure under low cyclic loadings. The failure mode of composite walls was influenced by freeze-thaw environment. With the increasing freezing- thawing cycles, cracking load and the ultimate load are all reduced, the stiffness and energy dissipation of brick masonry combination walls degenerated with different extents, cracking displacement and the ultimate displacement are gradually increased. Under the same freezing- thawing cycles, the bearing ability and energy dissipation capacity of double-span combination walls are relatively higher than single-span combination walls，hysteretic curve is more fat, ductility coefficient is 1.2 times higher than single-span composite walls, stiffness degradation rate was significantly lower. The ultimate bearing capacity, deformation capacity and seismic behavior are effectively improved in the presence of the tied columns. In the end，the formula of shear capacity of composite wall is presented. And the calculating results agree well with test results．
关键词
冻融环境 /
约束砖砌体组合墙 /
拟静力试验 /
抗震性能 /
受剪承载力
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Key words
frozen thawing atmosphere /
composite walls /
pseudo-static test /
seismic performance /
shear capacity
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