基于单轴压缩CT技术的混凝土细观破损分区研究  

Experimental study on meso damage-fracture divisional zones of concrete under uniaxial compression using CT technique

作　　者：田威[1] 党发宁[2] 陈厚群[2,3] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [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研究中心,北京100048

出　　处：《水利学报》2011年第8期995-1001,共7页Journal of Hydraulic Engineering

基　　金：国家自然科学基金重点项目(90510017);国家自然科学基金资助项目(50679073;50879069)

摘　　要：本文以混凝土试件实时单轴压缩CT图像为基础,将破损分区理论应用于混凝土CT图像的分析中,通过对分区的CT数阈值标准进行讨论和经验选定,定义了混凝土材料的安全区、损伤进行区和破损区。在此分区基础上,对不同加载阶段的安全区、损伤进行区和破损区的CT数信息进行了统计分析,验证了混凝土试件在单轴压缩条件下经历压密、扩容,CT尺度裂纹扩展到破坏的细观破损全过程,说明利用破损分区理论研究混凝土的破损机理是可行的。Based on CT real time scanning images of specimen under static compression, damage-fracture divisional zones theory has been applied to analyze concrete CT images. The criteria of the divisional zones according to the CT images are discussed and determined, so that the safety zone, the damaging zone and the damage-fracture zone of the concrete specimen can be defined. On the basis of the divisional zone, the CT data information in the three kinds of zones at each loading stage were analyzed. Then the meso damage-fracture of concrete under uniaxial compression experienced the processes of condense, enlargement, expansion of CT crack, and failure are verified. It shows that the utilization of damage-fracture divisional zones theory is feasible in researching the meso damage-fracture mechanisms of concrete.

关 键 词：混凝土 CT 破损分区 安全区 损伤进行区 破损区 

分 类 号：TU528.01[建筑科学—建筑技术科学]