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基于国内人工气候模拟实验室,对24个再生混凝土砖砌体试件进行不同循环次数的冻融模拟试验,进而进行轴心抗压试验,研究了冻融循环次数对再生混凝土砖砌体抗压性能的影响.对比分析了砌体试件破坏形态、抗压强度、应力-应变关系随冻融循环次数增加的变化规律;建立了砌体试件抗压强度均值随冻融循环次数退化的关系式;通过对砌体试件实测应力-应变数据的拟合,得到了不同冻融循环次数下砌体试件的抗压本构关系曲线.所得结果可为冻融循环下在役砌体结构耐久性研究以及抗震性能评估提供理论基础.
Based on the domestic artificial climate simulation laboratory, 24 recycled concrete brick masonry specimens were subjected to freeze-thaw simulation tests at different cycles, and then axial compression tests were carried out. The effects of freeze-thaw cycles on the compressive strength The relationship between the failure mode, the compressive strength and the stress-strain relationship of the masonry specimen with the increase of the number of freeze-thaw cycles was analyzed and compared. The relationship between the mean compressive strength of the masonry specimen and the number of cycles of the freeze-thaw cycle was established Through the fitting of the measured stress-strain data of the masonry specimen, the constitutive relation curves of the compressive stress of the masonry specimen under different freeze-thaw cycles are obtained.The obtained results can be used in the existing masonry structures under the freeze-thaw cycles Durability studies and seismic performance evaluation to provide a theoretical basis.