| 基于元胞自动机的开裂混凝土氯离子扩散模拟与分析 |
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| 引用本文： | 马俊军,蔺鹏臻,刘应龙,何志刚.基于元胞自动机的开裂混凝土氯离子扩散模拟与分析[J].西南交通大学学报,2022,57(2):360-368. |
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| 作者姓名： | 马俊军 蔺鹏臻 刘应龙 何志刚 |
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| 作者单位： | 兰州交通大学土木工程学院, 甘肃 兰州 730070 |
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| 基金项目： | 国家自然科学基金（U1934205,51878323)；;甘肃省建设科技攻关项目(JK2021-03)； |
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| 摘 要： | 为获得氯离子在开裂混凝土中的浓度分布以及分析裂缝形状、分布形式、偏转角度对混凝土中氯离子扩散效应的影响,根据氯离子在开裂混凝土中的扩散机理,利用元胞自动机和均匀化等效分析方法,建立了模拟开裂混凝土中氯离子扩散过程的元胞自动机模型,并利用数值试验对模型中元胞尺寸进行了优化.研究结果表明:在不影响计算精度的情况下,为提高模...
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| 关 键 词： | 裂缝 元胞自动机 耐久性 混凝土 氯离子 |
| 收稿时间： | 2021-05-06 |
Simulation and Analysis of Chloride Ion Diffusion in Cracked Concrete Based on Cellular Automata |
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| MA Junjun,LIN Pengzhen,LIU Yinglong,HE Zhigang.Simulation and Analysis of Chloride Ion Diffusion in Cracked Concrete Based on Cellular Automata[J].Journal of Southwest Jiaotong University,2022,57(2):360-368. |
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| Authors: | MA Junjun LIN Pengzhen LIU Yinglong HE Zhigang |
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| Affiliation: | School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China |
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| Abstract: | In order to obtain the concentration distribution of chloride ions in cracked concrete and analyze the influence of crack shape, distribution form and deflection angle on the chloride ion diffusion in concrete, a cellular automata model for simulating the diffusion process of chloride ions in cracked concrete is established by using cellular automata and homogenization equivalent analysis methods according to the diffusion mechanism of chloride ions in cracked concrete; the cell size in the model is optimized by numerical experiments. The results show that the computational efficiency of the model can be improved with a high calculation accuracy when the cell size of is 0.5 mm. Except for individual data, the model simulation results are in good agreement with the test results and finite element analysis results, and the maximum deviation is no more than 10%. The chloride ion concentration in the "V" crack is about 0.52 times that in the rectangular crack. The chloride ion concentration in curved cracks and broken line cracks is about 0.87 times and 0.89 times that in linear cracks, respectively. When the fracture deflection angle increases from 0° to 10°, 20°, and 30°, the chloride ion concentration at the fracture end decreases by 3.3%, 21.9%, and 29.8%, respectively. The influence range of the crack on the chloride diffusion zone around the crack is independent of the shape, distribution form, and deflection angle of the crack. The influenced area is mainly concentrated on the range of about 18 mm perpendicular to the crack. |
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