基于两相随机介质的混凝土破坏全过程模拟

梁诗雪, 李杰

梁诗雪, 李杰. 基于两相随机介质的混凝土破坏全过程模拟[J]. 工程力学, 2018, 35(2): 116-123. DOI: 10.6052/j.issn.1000-4750.2016.09.0748
引用本文: 梁诗雪, 李杰. 基于两相随机介质的混凝土破坏全过程模拟[J]. 工程力学, 2018, 35(2): 116-123. DOI: 10.6052/j.issn.1000-4750.2016.09.0748
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LIANG Shi-xue, LI Jie. A TWO-PHASE RANDOM MEDIUM MODEL FOR SIMULATING THE FAILURE PROCESS OF CONCRETE[J]. Engineering Mechanics, 2018, 35(2): 116-123. DOI: 10.6052/j.issn.1000-4750.2016.09.0748
Citation: LIANG Shi-xue, LI Jie. A TWO-PHASE RANDOM MEDIUM MODEL FOR SIMULATING THE FAILURE PROCESS OF CONCRETE[J]. Engineering Mechanics, 2018, 35(2): 116-123. DOI: 10.6052/j.issn.1000-4750.2016.09.0748
shu

基于两相随机介质的混凝土破坏全过程模拟

  • 1.

    浙江理工大学建筑工程学院, 杭州 310018;

  • 2.

    同济大学土木工程学院, 上海 200092;

  • 3.

    同济大学土木工程防灾国家重点实验室, 上海 200092

基金项目: 国家自然科学基金项目（90715033，U1134209）；浙江省自然科学基金青年项目（LQ18E080009）
详细信息
    作者简介:

    梁诗雪(1987―),女,湖南人,讲师,博士,主要从事混凝土随机损伤力学、混凝土多尺度模拟研究(E-mail:liangshixue0716@126.com).

    通讯作者:

    李杰(1957―),男,河南人,教授,博士,博导,主要从事混凝土随机损伤力学、随机动力系统分析与生命线工程抗灾研究(E-mail:lijie@tongji.edu.cn).

  • 中图分类号: TU528.1

A TWO-PHASE RANDOM MEDIUM MODEL FOR SIMULATING THE FAILURE PROCESS OF CONCRETE

  • 1.

    School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China;

  • 2.

    School of Civil Engineering, Tongji University, Shanghai 200092, China;

  • 3.

    Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

摘要

    摘要
  • 摘要: 通过两相随机介质对混凝土细观结构进行建模，给出了混凝土破坏全过程模拟。首先，为了反映混凝土水泥砂浆和骨料的随机分布，引入新近发展的两相介质随机场对混凝土进行建模。采用随机点集生成随机有限元与内聚单元，以考虑裂纹分布的随机性，形成混凝土材料破坏分析的数值模型。数值模拟给出了混凝土单轴受拉裂纹开展全过程。数值模拟结果表明：当骨料断裂能明显大于水泥砂浆断裂能时，采用两相随机介质，能够较好地描述在受拉状态下，混凝土裂纹主要产生于水泥砂浆及骨料以及水泥砂浆的界面处，较少骨料破坏，这一典型特征。最后，通过模拟所得的均匀化应力-应变关系与混凝土单轴受拉试验结果对比，进一步验证了该文所给出的两相随机介质模拟的正确性。
    Abstract: A two-phase random medium model is proposed to simulate the complex cracking process and failure mode of concrete. To represent the random distribution of mortar and aggregates of concrete, a newly developed two-phase random field is introduced to reconstruct the realistic concrete samples. The finite element and adjacent cohesive element, which can be considered as the potential cracking path, are generated for the numerical model. The complete cracking process and failure of concrete samples under uniaxial tension is proposed in the numerical simulations. By applying the two-phase random medium model, the main characteristics of concrete failure that cracks usually happen in the mortar rather than the aggregates can be well captured when the fracture energy of the aggregates are significantly larger than the mortar. The predicted stress-strain relationship agrees well with the experimental results, manifesting the validity of the proposed two-phase random medium simulation of concrete.
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    • 参考文献(24)
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出版历程
  • 收稿日期:  2016-09-26
  • 修回日期:  2017-04-13
  • 刊出日期:  2018-02-24

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