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为了解冻融环境作用下RC剪力墙的抗震性能,采用人工气候实验室对6片剪跨比为2.14的RC剪力墙试件进行冻融循环模拟试验,而后对其进行拟静力加载试验,得到了不同混凝土强度等级和不同冻融循环次数下冻融试件的滞回曲线,绘制出各个试件的骨架曲线,分析了混凝土强度和冻融循环次数对冻融试件强度、刚度、延性、耗能能力等抗震性能指标的影响.结果表明:相同混凝土强度的RC剪力墙随冻融循环次数的增加,承载力、位移延性系数和塑性转角显著降低,强度衰减和刚度退化幅度增大,累积耗能不断减小,抗震性能降低;经相同次数冻融循环的RC剪力墙随混凝土强度等级的提高,承载力和累积耗能增加,强度衰减和刚度退化幅度降低,而延性则先增加后减小,说明提高混凝土强度等级可改善冻融后RC剪力墙的抗震性能.
In order to understand the seismic behavior of RC shear walls under the action of freezing and thawing, a 6-slice RC shear wall specimen with a shear-to-span ratio of 2.14 was subjected to a freeze-thaw cycle simulation test in an artificial climate laboratory and then pseudo-statically loaded The hysteresis curves of specimens under different concrete strength grades and freeze-thaw cycles were obtained, and the skeleton curves of each specimen were plotted. The effects of concrete strength and the number of freeze-thaw cycles on the strength and stiffness , Ductility, energy dissipation and other seismic performance.The results show that with the increase of the number of freeze-thaw cycles, the RC shear wall with the same concrete strength significantly reduces the bearing capacity, displacement ductility coefficient and plastic rotation angle, and the strength attenuation and stiffness degradation The cumulative energy consumption decreases and the seismic performance decreases. With the increase of concrete strength, the RC shear walls with the same number of freeze-thaw cycles increase in bearing capacity and cumulative energy consumption, the strength attenuation and stiffness degradation range decrease, while the ductility The first increase and then decrease, indicating that increasing the concrete strength level can improve the anti-seismic performance of the RC shear wall after freezing and thawing.