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| 混凝土CT 图像中等效裂纹区域的定量分析 | |
| 引用本文： | 陈厚群,丁卫华,党发宁,尹小涛.混凝土CT 图像中等效裂纹区域的定量分析[J].中国水利水电科学研究院学报,2006,4(1):1-7. |
| 作者姓名： | 陈厚群 丁卫华 党发宁 尹小涛 |
| 作者单位： | 1. 冻土工程国家重点实验室,甘肃,兰州,730000;中国水利水电科学研究院,工程抗震研究中心,北京,100044 2. 冻土工程国家重点实验室,甘肃,兰州,730000;西安理工大学,水利水电学院,陕西,西安,710048 3. 西安理工大学,水利水电学院,陕西,西安,710048 |
| 基金项目： | 国家自然科学基金;西安理工大学校科研和校改项目;国家重点实验室基金 |
| 摘 要： | 从细观尺度观察,混凝土材料可看作由骨料、砂浆及其结合面构成的不均匀复合材料.为研究加载时裂纹在混凝土内部结构中扩展的过程,采用X射线CT扫描技术获得单轴动载条件下混凝土破裂过程的系列CT图像.对于CT图像中裂纹信息的提取,传统的方法是将CT图像中的低密度区作为裂纹区域,无法准确地识别裂纹和判定裂纹具体形态.本文根据差值CT图像是否出现线状或环状影像判断裂纹的存在.通过变换差值CT图像中像素值的阈值范围分析裂纹的分布特点.根据CT物理原理确定等效裂纹区域.探讨了混凝土CT图像中裂纹及其形态的判定时存在的问题. |
| 关 键 词： | 混凝土 裂纹 差值CT图像 阈值 |
| 文章编号： | 1672-3031（2006）01-0001-07 |
| 收稿时间： | 2005-11-04 |
| 修稿时间： | 2005年11月4日 |
Quantitative analysis of equivalent crack region in CT images of concrete |
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| CHEN Hou-qun,DING Wei-hu,DANG Fa-ning and YIN Xiao-tao.Quantitative analysis of equivalent crack region in CT images of concrete[J].Journal of China Institute of Water Resources and Hydropower Research,2006,4(1):1-7. | |
| Authors: | CHEN Hou-qun DING Wei-hu DANG Fa-ning and YIN Xiao-tao |
| Affiliation: | 1?? StateK ey Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences, Lanzhou ?? 730000, China;2??Earthquake Engineering Research Center, IWHR , Beijing ?? 100044, China;1?? StateK ey Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences, Lanzhou ?? 730000, China;3?? Insti tute of Water Resources and Hydro-electric Engineering , Xi?? an University of Technology , Xi?? an ?? 710048, China;1. State Key Laboratory of Frozen Soil Engineering, Chinese Academy of Sciences, Lanzhou,730000, China;3. Institute of Water Resources and Hydro-electric Engineering , Xi'an University of Technology , Xi'an,710048, China;Institute of Water Resources and Hydro-electric Engineering , Xi'an University of Technology , Xi'an,710048, China |
| Abstract: | In view of the meso-mechanism, concrete can be regarded as a heterogeneous composite material consisting of aggregates, mortar and interfaces. In order to investigate the crack propagation in the inner structure of concrete under loading, a series of CT images about the fracture evolution process of concrete under a uni-axial dynamic loading condition was obtained by applying the X-ray CT technique. The traditional method of collecting crack information in CT images is to define the low density region in the CT images as the cracks. But the cracks would not be truly identified and the specific shape of the cracks would not be clearly determined. This paper presents a method of determining cracks according to linear or circular shadows whether or not appearing in the minus image between CT images. The characteristics of distributional region of cracks are also analyzed by means of changing threshold value. Then, the equivalent crack region can be determined based on the CT physics theory. Finally, a few issues about crack determination criterion and crack locations are discussed. |
| Keywords: | CT |
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