| 混凝土拉压强度尺寸效应的细观非均质机理 |
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| 引用本文： | 杜敏,杜修力,金浏,卢爱贞.混凝土拉压强度尺寸效应的细观非均质机理[J].土木建筑与环境工程,2015,37(3):11-18. |
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| 作者姓名： | 杜敏 杜修力 金浏 卢爱贞 |
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| 作者单位： | 1. 北京工业大学 城市与工程安全减灾教育部重点实验室 北京 100124; 防灾科技学院 河北 三河 065201;2. 北京工业大学 城市与工程安全减灾教育部重点实验室 北京 100124 |
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| 基金项目： | 国家自然科学基金，中国地震局教师科研基金 |
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| 摘 要： | 为了从材料细观非均质角度揭示混凝土强度尺寸效应机理，建立了混凝土细观单元等效非均质力学模型，开展了立方体抗拉、抗压强度尺寸效应细观数值模拟研究。研究结果表明：混凝土强度尺寸效应根源于材料细观非均质性，随着模型尺寸的增加，混凝土材料细观单元弹性模量变异系数增大，材料细观非均质性增强，大尺寸模型内部存在更多的低强度单元或缺陷，导致混凝土立方体抗拉、抗压强度降低，极限应变减小，脆性增大；混凝土损伤破坏由少量集中区域，发散扩展形成多条非贯通的裂纹带；数值模拟结果与尺寸效应实验数据相吻合。
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| 关 键 词： | 混凝土 细观非均质 细观单元等效化模型 强度尺寸效应 破坏模式 |
| 收稿时间： | 2014/11/8 0:00:00 |
Meso-heterogeneity mechanism of the concrete size effect of tension and compression strength |
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| Du Min,Du Xiuli,Jin Liu and Lu Aizhen.Meso-heterogeneity mechanism of the concrete size effect of tension and compression strength[J].土木建筑与环境工程,2015,37(3):11-18. |
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| Authors: | Du Min Du Xiuli Jin Liu and Lu Aizhen |
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| Affiliation: | The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, P.R.China; Institute of Disaster-prevention Science and Technology, Sanhe 065201,Hebei, P.R.China,The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, P.R.China,The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, P.R.China and The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, P.R.China |
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| Abstract: | In order to reveal the size effect meso-heterogeneity mechanism of concrete strength,the meso-element equivalent heterogeneity model was established.Tension and compression tests were simulated for different size meso-heterogeneity models.The results showed that the size effect of concrete is rooted in the meso-heterogeneity mechanism of materials.With the increase of model size,the variation coefficient of meso-element elastic modulus increases and meso-heterogeneity of concrete heightened.Also,more low-strength units or defects were discovered in the large-size model.As a result,the tension and compression strength of concrete and the ultimate strain decreased and the brittleness of concrete strengthened. Concrete damage region extended from the concentrated area to multiple non-penetrating crack zones. |
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| Keywords: | concrete meso-heterogeneity meso-element equivalent model strength size effect failure mode |
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