单轴压缩CT实验条件下混凝土细观结构破裂分析  

Fracturing analysis of concrete meso-structure under the uniaxial compression test with CT scan

作　　者：周尚志[1] 党发宁[2] 陈厚群[3] 刘瑛[1] 

机构地区：[1]长沙理工大学土木与建筑工程学院,湖南长沙410076 [2]西安理工大学水利水电学院,陕西西安710048 [3]中国水利水电科学研究院工程抗震中心,北京100044

出　　处：《海洋工程》2009年第2期89-95,共7页The Ocean Engineering

基　　金：国家自然科学基金重点资助项目(90510017);国家自然科学基金资助项目(10372078,50679073)

摘　　要：在圆柱混凝土单轴压缩CT试验的基础上,利用计算机层析成像技术提供的混凝土体损伤破裂演化图像,定义每一点的CT数变化量为该像素点CT数与其后紧邻的同行像素点、其下紧邻的同列像素点的CT数差的绝对值中的较大值。根据CT数在扫描断面上的分布规律,设定了提取疑似裂纹区的像素点CT数变化量标准值ζ=20,进行了疑似裂纹区的检出操作。并对其上的几何信息和CT数进行了统计,接着定义了裂纹长度和宽度,利用该参数对裂纹尺寸进行了计算。该工作对于推动混凝土工程CT图像定量化描述具有一定意义。Based on CT test of concrete under uniaxial compression loading condition, utilizing the evolution images of crack or damage in the concrete offered by the computerized tomography, the changing value of CT number at each pixel is defined to be the maximum absolute value between the margins of the CT number of this pixel and the proximate ones in the same row and column. According to the distribution of CT number on scanning section, the changing criteria of CT number at pixels where ζ equals 20 are defined, then the doubtful crack is obtained. Simultaneously, the geometrical and CT information in the region of crack is computed. Then, the length and width of the crack are defined and calculated. The work will be important to push the quantitative analysis of CT image in concrete engineering forward.

关 键 词：混凝土材料 CT实验 损伤 破裂分析 

分 类 号：TU375[建筑科学—结构工程]