以4榀相同特性的带构造柱砖墙为研究对象，分别进行0、40、80及120次冻融循环试验和低周反复荷载试验，来研究冻融环境对砌体结构抗震性能的影响。试验结果表明：随着冻融循环次数的增加，裂缝出现更早，发展更为迅速，破坏程度更加严重，承载力、刚度、耗能、延性均出现明显的衰减。本文从宏观和微观两个方面对遭受冻融作用砖墙进行了损伤机理的分析。%To investigate the effect of freeze thaw action on the seismic behavior of masonry struc-tures,in this study,we investigated the responses of four pieces of brick walls with a construc-tional column,all having the same properties.We conducted freeze thaw action experiments and low cyclic loading experiments for freeze thaw cycles numbering 0,40,80,and 120.By observation and analysis of the failure modes and mechanical properties of the brick walls with a construction-al column,we obtained the performance degradation characteristics associated with an increase in the number of freeze thaw cycles in brick walls.The results show that the failure modes of brick walls under freeze thaw action differ from those that remain intact.With an increase in the number of freeze thaw cycles,cracks appeared earlier and developed more quickly,and the specimens were damaged more seriously.The bearing capacity,stiffness,and ductility of the specimens also decreased significantly and their dissipation capability decreased with an increase in the number of cycles.To gain a more in-depth understanding of the effect of freeze thaw cycles on brick walls,in this paper,we analyze the damage mechanism of the brick wall from both the microcosmic and macroscopic perspectives.The main microcosmic factor influencing the walls is the hydrostatic pressure result from freezing,and the main macroscopic factors are the efflorescence phenomenon and the interface damage caused by freezing.
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