摘要
本文首先利用单轴压缩条件下混凝土CT资料，对有裂纹出现的σ=20．59～31．03MPa阶段的CT图像进行了裂纹提取操作。在所取得的裂纹图像的基础上，利用码尺法、盒计数法、小岛法和Sandbox法对其分维数进行了计算。最后，对裂纹分维数随加载过程的变化进行了分析，利用分维数的演化信息讨论了混凝土破裂的分形特性。
Firstly, the cracks which appear in the CT images scanned at the stage of stresses from 20.59MPa to 31.03MPa are obtained from these images by means of CT data from concrete under the uniaxial compression condition. Based on the these binary images of cracks, the fractional dimensions of cracks in the concrete are computed by the methods of Yardstick, Box-counting, Island and Sandbox. Finally, the relations between the fractional dimensions of cracks and the loading process are analyzed, Simultaneously, the fractional characteristics of the damage and fracture of concrete are discussed by the evolution information of the fractional dimensions.
出处
《水力发电学报》
EI
CSCD
北大核心
2006年第5期112-117,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金重点资助项目(90510017)
关键词
建筑材料
分形特性
CT
裂纹
混凝土
building material
fractional characteristics
CT
crack
concrete
