华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (10): 52-56.

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非均质混凝土细观数值模型及其在双边裂纹加载中的应用

刘庭金 莫海鸿 朱合华   

  1. 1.华南理工大学 建筑学院,广东 广州 510640;2.同济大学 地下建筑与工程系,上海 200092
  • 收稿日期:2004-12-17 出版日期:2005-10-25 发布日期:2005-10-25
  • 通信作者: 刘庭金(1976-),男,博士,讲师,主要从事岩土及地下结构方面的研究 E-mail:liu_tingjin@163.com
  • 作者简介:刘庭金(1976-),男,博士,讲师,主要从事岩土及地下结构方面的研究
  • 基金资助:

    华南理工大学自然科学青年基金资助项目(304E5041030)

Mesoscopic Numerical Model for Heterogeneity Concrete and Its Application Under Double-Edge-Notched Loading

Liu Ting-jin  Mo Hai-hong  Zhu He-hua   

  1. 1.College of Architecture and Civil Engineering,South China Univ.of Tech.,Guangzhou 5 10640,Guangdong,China;2.De .of Geotechnical Engineering,Tongji Univ.,Shanghai 200092,China
  • Received:2004-12-17 Online:2005-10-25 Published:2005-10-25
  • Contact: 刘庭金(1976-),男,博士,讲师,主要从事岩土及地下结构方面的研究 E-mail:liu_tingjin@163.com
  • About author:刘庭金(1976-),男,博士,讲师,主要从事岩土及地下结构方面的研究
  • Supported by:

    华南理工大学自然科学青年基金资助项目(304E5041030)

摘要: 基于混凝土细观层次的结构特征,通过Weibull随机分布函数引入材料的非均匀性,结合细观单元的弹塑性各向异性损伤模型,建立了非均质混凝土破坏过程的细观数值模型.然后运用所建立的细观数值模型,对双边裂纹非均质混凝土在双轴加载条件下的渐进破坏过程进行了数值试验,所得结果与Suafis的试验结果基本一致,从而验证了所建立的模型的合理性,为从细观层次研究混凝土的渐进破坏过程、揭示混凝土的破坏机理提供了一种新的数值试验手段.

关键词: 细观数值模型, 非均质, 混凝土, 双边裂纹, 双轴加载, ;破坏过程

Abstract:

A mesoscopic numerical model to investigate the failure process of heterogeneous concrete is established,in combination with an elastic-plastic anisotropic damage model for the mesoscopic element of concrete.The proposed modelis based on the mesoscopic structure characteristics of concrete.in which the Weibull stochastic distri.bution function is adopted to introduce the heterogeneity of concrete.By using the established mesoscopic numerical model,numerical experiments about the progressive failure process of a double-edge-notched specimen under biaxial loading are then carried out.The results are basically consistent with those of Suaris’s experiments,thus verifying the rationality of the proposed model.Th e present research has provided a new numerical method for investigating the progressive failure process and the failure mechanism of concrete.

Key words: mesoscopic numerical model, heterogeneity, concrete, double-edge notched, biaxial loading, failure process