冻融循环下古砖砌体的受压破坏研究  

Compression Damage in Ancient Brick Masonry under Freeze-thaw Cycles

作　　者：曹新宇 逯兴邦 汤永净[2] 徐金明[1,3] CAO Xinyu;LU Xingbang;TANG Yongjing;XUJlnnung(Department of Civil Engineering, Shanghai University, Shanghai 200444, China;Department of Geoteehnieal Engineering,Tongji University,Shanghai 200092, China;Basic Scientific Research Institute of Cultural Heritage Protection, Shanghai University, Shanghai 200444, China)

机构地区：[1]上海大学土木工程系,上海200444 [2]同济大学地下建筑与工程系,上海200092 [3]上海大学文化遗产保护基础科学研究院,上海200444

出　　处：《结构工程师》2018年第2期122-128,共7页Structural Engineers

基　　金：国家自然科学基金(51278359)

摘　　要：环境变迁对古砖砌体受力性能有直接影响。基于大气环境实验舱对山西某地古砖进行了不同次数的冻融循环抗压试验,运用图像处理技术分析了试件裂缝的特征,分析了不同冻融循环次数对古砖砌体抗压性能的影响。结果表明,古砖砌体中部产生的裂缝宽度最小;冻融循环次数为20次时古砖砌体的开裂荷载和破坏荷载较大;开裂荷载与破坏荷载差值大于190 k N时,裂缝平均宽度在1.8 mm上下波动;经冻融循环的古砖砌体,破坏特征的第一阶段显著提前出现,进入第一阶段时对应的荷载与破坏荷载百分比平均值为35.16%。研究成果对古建筑受力性能评估具有一定的参考价值。Environmental change has a direct impact on the ancient brick masonry. Taking the ancient bricks in Shanxi Province as an example to perform the laboratory test in investigating the compression damage of the bricks under freeze-thaw cycles in atmospheric environmental. The regulations of the cracks were analyzed using image processing techniques. The influences of the number in freeze-thaw cycles on compression features of the ancient brick masonry were furthennore examined. It shows that the width of cracks in the central part is less than that in other locations ;the crack load and failure load are larger than others as the number in freezethaw cycles reach to 20 ;when difference value between cracking load and failure load is larger than 190 kN, average of crack width is around 1.8 mm. The damages of the brick masomT in the first stage occur ahead of time significantly if the masomT beards the freeze-thaw cycles, and the damage percentage in the first stage is 35.16% ,respectively. The results in the current study may be referable in analyzing the features on ancient brick masonry.

关 键 词：古砖砌体 破坏 冻融循环 裂缝宽度 

分 类 号：TU364[建筑科学—结构工程]