| 混凝土断裂的三维旋转裂缝模型研究 |
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| 引用本文： | 周元德, 张楚汉, 金峰. 混凝土断裂的三维旋转裂缝模型研究[J]. 工程力学, 2004, 21(5): 1-4,82. |
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| 作者姓名： | 周元德 张楚汉 金峰 |
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| 作者单位： | 清华大学水利水电工程系, 北京, 100084 |
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| 基金项目： | 国家重点基础研究发展规划“973”(2002CB412709) |
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| 摘 要： | 作为一种准脆性材料,混凝土在发生开裂后将表现一定的应变软化特性。基于Bazant提出的钝断裂带力学模型,将其扩展为三维旋转裂缝模型,并推导出相应的三维软化本构,应用于复杂应力路径下混凝土开裂扩展的三维数值模拟。通过对比四点剪切梁试验的数值模拟结果与试验结果,验证了该模型能较好地模拟混凝土混合型开裂行为。
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| 关 键 词： | 结构工程 混凝土断裂 旋转裂缝 应变软化 钝断裂带 |
| 文章编号： | 1000-4750(2004)05-0001-05 |
| 收稿时间： | 2003-01-03 |
| 修稿时间： | 2003-04-08 |
ANALYSIS OF CONCRETE FRACTURE WITH THREE-DIMENSIONAL ROTATING CRACK MODEL |
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| ZHOU Yuan-de, ZHANG Chu-han, JIN Feng. ANALYSIS OF CONCRETE FRACTURE WITH THREE-DIMENSIONAL ROTATING CRACK MODEL[J]. Engineering Mechanics, 2004, 21(5): 1-4,82. |
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| Authors: | ZHOU Yuan-de ZHANG Chu-han JIN Feng |
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| Affiliation: | Department of Hydraulic and Hydropower Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | As a kind of quasi-brittle material, concrete exhibits strain-softening behavior after the formation of micro-cracks. Based on the blunt crack band theory proposed by Z.P. Bazant, a 3-D softening constitutive relationship of rotating crack model is formulated. This crack model is then implemented into a finite element program and used for 3-D concrete fracture analysis under complex loading conditions. Numerical simulation of the single-edge notched shear beam by this crack model is compared with the corresponding experimental results and the one by fixed crack model. It is demonstrated that the 3-D rotating crack model herein can give more objective results in the analysis of mixed-mode fracture for concrete. |
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| Keywords: | structural engineering concrete fracture rotating crack model strain-softening blunt crack band |
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