| 考虑损伤阀值影响的钢纤维混凝土损伤本构模型研究 |
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| 引用本文： | 薛云亮,李庶林,林峰,徐宏斌.考虑损伤阀值影响的钢纤维混凝土损伤本构模型研究[J].岩土力学,2009,30(7):1987-1992. |
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| 作者姓名： | 薛云亮 李庶林 林峰 徐宏斌 |
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| 作者单位： | 厦门大学 建筑与土木工程学院，厦门 361005 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划)，厦门大学人才引进项目 |
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| 摘 要： | 从室内试验得到的不同体积率下的钢纤维混凝土全应力-应变曲线的特性，探讨了损伤变量的变化规律及建立钢纤维混凝土损伤本构模型时考虑损伤阀值影响的必要性。基于连续损伤力学理论和统计强度理论，在传统的两参数Weibull分布函数基础上引入损伤阀值参数（位置参数），建立可考虑损伤阀值影响的钢纤维混凝土损伤本构模型，该模型可以反映钢纤维混凝土在低应力水平或变形较小时的线弹性变形特性；根据经验确定损伤阀值参数后，通过混凝土应力-应变全曲线的几何条件求解Weibull分布函数另外两个参数的表达式。最后，基于MATLAB的分析计算结果，并通过与钢纤维混凝土单轴压缩试验实测结果对比，证明模型可以很好的反映单轴受压状态下钢纤维混凝土的应力-应变关系，探讨了损伤阀值取值的大小。
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| 关 键 词： | 钢纤维混凝土 损伤阀值 微元强度 本构模型 |
| 收稿时间： | 2008-10-22 |
Study of damage constitutive model of SFRC considering effect of damage threshold |
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| XUE Yun-liang,LI Shu-lin,LIN Feng,XU Hong-bin.Study of damage constitutive model of SFRC considering effect of damage threshold[J].Rock and Soil Mechanics,2009,30(7):1987-1992. |
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| Authors: | XUE Yun-liang LI Shu-lin LIN Feng XU Hong-bin |
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| Institution: | School of Architectural and Civil Engineering, Xiamen University, Xiamen 361005, China |
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| Abstract: | Based on the characteristics of whole stress-strain curve of SFRC of different steel fiber volume ratios of laboratory test, the change of damage variable and the necessity of considering the influence of the damage threshold in developing the damage constitutive model of SFRC are discussed. Then, according to continuum damage theory and the statistical approaches of strength, the introduction of damage threshold based on the traditional Weibull random distribution of two parameters, the damage constitutive model of compression process of SFRC considering the damage threshold is proposed. This model can reflect the linear-elastic characteristics of SFRC deformation in low stress level or small deformation. Then when the value of damage threshold is determined by experience, the expression of two other parameters of Weibull random distribution is deduced through the geometric conditions of the whole stress-strain curve of SFRC. Finally, the analysis results of MATLAB contrast with uniaxial compression test results, it is shown that this model correctly reflects the stress-strain relation under uniaxial compression; and the value of damage threshold is discussed. |
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| Keywords: | SFRC damage threshold microcosmic element strength constitutive model |
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