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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。
In order to study the seismic behavior of brick masonry walls constrained by column-ring beam under freezing-thawing atmospheric environment, accelerated freezing and thawing tests were carried out on four composite single-wall and four composite double-wall pieces using climate simulating laboratory Quasi-static loading test was carried out on it. The experimental results show that the specimens show shear failure under low cyclic loading, and the freeze-thaw environment has a certain influence on the failure morphology of brick masonry composite walls. With the increase of the number of freeze-thaw cycles, the cracking load And the ultimate load decreases continuously, while the stiffness and energy dissipation capacity gradually degrade, while the displacement and the ultimate displacement increase gradually. When the number of freeze-thaw cycles is the same, the bearing capacity, deformation capacity and energy dissipation capacity of the combined double- The hysteresis curve is more full. The ductility coefficient is about 1.2 times of that of the combined single wall, and the rate of stiffness degradation is obviously reduced. It is indicated that the multi-channel structural columns can effectively improve the seismic performance of the combined wall of brick masonry in freezing and thawing environment. The formula of shear bearing capacity of brick masonry composite walls considering the number of freeze-thaw cycles is established, and the calculated results are in good agreement with the experimental results.