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不同类型混凝土弯曲强度尺寸效应

曹擎宇, 孙伟, 郝挺宇, 苏波

曹擎宇, 孙伟, 郝挺宇, 苏波. 不同类型混凝土弯曲强度尺寸效应[J]. 北京工业大学学报, 2013, 39(9): 1311-1315.
引用本文: 曹擎宇, 孙伟, 郝挺宇, 苏波. 不同类型混凝土弯曲强度尺寸效应[J]. 北京工业大学学报, 2013, 39(9): 1311-1315.
CAO Qing-yu, SUN Wei, HAO Ting-yu, SU Bo. Size Effect on Flexural Strength of Various Concrete[J]. Journal of Beijing University of Technology, 2013, 39(9): 1311-1315.
Citation: CAO Qing-yu, SUN Wei, HAO Ting-yu, SU Bo. Size Effect on Flexural Strength of Various Concrete[J]. Journal of Beijing University of Technology, 2013, 39(9): 1311-1315.

不同类型混凝土弯曲强度尺寸效应

基金项目: 

铁道部科技研究开发计划资助项目(2010GGKY02)

中冶工程技术中心研发资助项目(0032012001).

详细信息
    作者简介:

    曹擎宇(1982—), 男, 工程师, 主要从事先进水泥基复合材料方面的研究, E-mail: achero@126.com.

    通讯作者:

    孙伟(1935—), 女, 教授, 博士生导师, 中国工程院院士, 主要从事先进水泥基复合材料和混凝土结构服役特性方面的研究, E-mail: sunwei@seu.edu.cn.

  • 中图分类号: TU528

Size Effect on Flexural Strength of Various Concrete

  • 摘要: 基于混凝土脆性的评价指标, 采用Bazant提出的基于能量释放的尺寸效应律的方法, 以普通混凝土、粉煤灰混凝土、轻骨料混凝土、纤维混凝土和聚合物改性混凝土为样本, 对其弯曲强度的尺寸效应进行研究, 定量表征不同类型混凝土的脆性.研究结果表明:Bazant提出的尺寸效应律适用于不同种类混凝土的弯曲强度的尺寸效应评价;从尺寸效应律曲线分析可知, 轻骨料混凝土比其他混凝土呈现明显的脆性断裂行为, 而纤维混凝土和聚合物改性混凝土的脆性断裂行为不明显, 粉煤灰对于混凝土脆性的改善也具有一定的作用;线性断裂理论在一定尺寸范围内比非线性断裂理论更适用于混凝土断裂行为的评价.
    Abstract: Based on brittleness evaluating index of concrete, the normal concrete, fly ash concrete, lightweight aggregate concrete, fiber concrete and polymer-modified concrete were selected as sample, and the size effect on flexural strength by the method of the Bazan's size effect law was presented to show the brittleness degree of concrete.The Bazant's size effect law gave a very good fit to the flexural strength of concrete measured from beams of different sizes.As observed in the size effect curves, the fracture behavior of lightweight concrete seemed more brittle than that of the other HPC, and fiber concrete and polymer-modified concrete showed less brittle than normal concrete, moreover, fly ash was less benefit for brittle decreased.Linear elastic fracture mechanics may still be less applicable to concrete in the normal size range than nonlinear fracture mechanics.
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    [7] 徐定华, 徐敏.混凝土材料学概论[M].北京:中国标准出版社, 2002:87-92.
    [8] 冯乃谦, 邢峰.高性能混凝土[M].北京:原子能出版社, 2000:134-136.
    [9] 吴智敏, 赵国藩, 徐世烺.大尺寸混凝土试件的断裂韧度[J].水利学报, 1997 (6) :67-70, 76.WU Zhi-min, ZHAO Guo-fan, XU Shi-lang.Fracture toughness of large-scale concrete specimens[J].Journal of Hydraulic Engineering, 1997 (6) :67-70, 76. (in Chinese)
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  • 被引次数: 0
出版历程
  • 收稿日期:  2011-11-15
  • 网络出版日期:  2022-11-02

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