基于CT图像的混凝土损伤演化分形特性研究  

A Study of Fractal Characteristics of Concrete Damage Evolution under CT Test Condition

作　　者：梁昕宇[1] 党发宁[1] 田威[1] 陈厚群[1,2] 靳卫强 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]中国水利水电科学研究院,北京100044 [3]河北电力建设监理有限责任公司,河北石家庄050011

出　　处：《西安理工大学学报》2010年第4期382-387,共6页Journal of Xi'an University of Technology

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(50679073);水利部公益性行业科研专项基金资助项目(2007SHZ1-200701004);西安理工大学优秀博士基金资助项目(106-210909)

摘　　要：以单轴压缩条件下混凝土细观结构CT图像为研究对象,运用分形几何中的差分盒维数法计算出不同扫描断面不同应力阶段的CT图像分形维数,分析了加载过程中分形维数的变化特征,提出了相应的损伤变量,并建立了混凝土材料的损伤演化方程,描述了损伤变量与应变的关系。结果表明该方程可以体现出混凝土试件经历压密、扩容、微裂纹扩展、破坏四个阶段。Based on the CT data about concrete under the uniaxial compression condition,fractal dimensions of CT image of different scanning sections at diversity stress stages are calculated by using DBC of fractal theory.The varying behaviors between the fractal dimension of concrete and the loading process are analyzed.Simultaneously,the corresponding damage variable are presented,and damage evolution equation of concrete material is established,and the relationship between the damage variable and strain is described in this paper.The result shows that the equation may reflect the four phases of concrete specimen loaded,including compaction,expansion,micro-crack growth and damage.

关 键 词：混凝土 细观损伤 分形 分维数 CT 

分 类 号：O319.56[理学—一般力学与力学基础]