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基于CT扫描图形的混凝土单轴压缩动力破坏过程分形研究

DOI: 10.13197/j.eeev.2015.02.208.fangjy.026, PP. 208-214

Keywords: 混凝土,CT扫描图,差分盒维数,定量参数,裂纹

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Abstract:

当前利用CT研究混凝土处于“观察研究阶段”,未能对CT试验资料进行定量地描述,严重浪费了CT数资源.本文利用与CT扫描仪配套的便携式动力加载设备,进行了混凝土动力加载实时扫描试验;记录了混凝土动力加载破坏的全过程.根据所获混凝土各受力阶段的CT扫描图,借助于数字图像处理技术和差分盒维数方法,得出了混凝土试样的裂纹演化图像,并计算了试样CT扫描图的分形维数,从细观层面上对混凝土在动荷载作用下的裂纹演化规律进行了定量化研究.在动力单轴压缩荷载作用下,混凝土试样的裂纹穿越骨料追随能量释放最快路径发展;混凝土试样的CT扫描图像有很好的分形特征;以分形维数建立的损伤变量能较好地反映出混凝土试样损伤裂纹的演化规律;分形维数可作为研究混凝土裂纹演化的定量参数.

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