| 冲击荷载下混凝土损伤裂纹的分形实验 |
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| 引用本文： | 祝文化,李建雄,宋成梓.冲击荷载下混凝土损伤裂纹的分形实验[J].武汉大学学报(工学版),2010,43(1). |
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| 作者姓名： | 祝文化 李建雄 宋成梓 |
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| 作者单位： | 1. 武汉理工大学土木工程与建筑学院,湖北,武汉,430070
2. 中国五环工程有限公司,湖北,武汉,430223 |
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| 摘 要： | 采用分离式Hopkinson压杆实验装置,对混凝土材料在冲击荷载下的动态单轴压应力极限值及裂纹分形维数值进行了研究.依据盒维数计算原理,设计了基于Matlab的数字图像盒维数计算程式,建立了一种数字图像盒维数简易算法.实验结果表明,冲击荷载条件下,混凝土表面裂纹具有很好的分形特性,分维是表征混凝土破坏程度的一个定量参数,并用分形维数对混凝土试块的单轴动态抗压强度极限值和应变率进行定量描述,拟合了试块动态单轴压应力极限值与其对应的分形维数的定量关系.为探索混凝土表面裂纹图形的分形特征与其承受的动荷载之间的内在规律,提供了一条新的研究思路.
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| 关 键 词： | 霍普金森压杆(SHPB) 混凝土 裂纹 盒维数 冲击荷载 |
Fractal experiment of damaged concrete under impact loading |
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| ZHU Wenhua,LI Jianxiong,SONG Chengzi.Fractal experiment of damaged concrete under impact loading[J].Engineering Journal of Wuhan University,2010,43(1). |
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| Authors: | ZHU Wenhua LI Jianxiong SONG Chengzi |
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| Affiliation: | ZHU Wenhua1,LI Jianxiong2,SONG Chengzi1(1.School of Civil Engineering , Architecture,Wuhan University of Technology,Wuhan 430070,China,2.China Wuhuan Engineering Co.,Ltd.,Wuhan 430223,China) |
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| Abstract: | Researches were carried on extreme of concrete dynamic uniaxial compression stress and crack fractal dimension,by using the split Hopkinson pressure bar(SHPB) device.Basing on the box-counting dimension calculation method,Matlab calculating functions of 2D digital image box-counting dimension were actualized and a direct computational method of 2D digital image box-counting dimension was achieved.Experimental results indicate that under impact loading,the surface crack distribution of damaged concrete exhib... |
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| Keywords: | split Hopkinson pressure bar concrete crack box-counting dimension impact loading |
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