| 三点弯曲试件混凝土KIC效应公式的修正 |
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| 引用本文： | 曹亮,王向东.三点弯曲试件混凝土KIC效应公式的修正[J].河海大学学报(自然科学版),2007,35(1):63-66. |
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| 作者姓名： | 曹亮 王向东 |
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| 作者单位： | 1. 河海大学土木工程学院,江苏,南京,210098;南通市建筑设计研究院,江苏,南通,226006
2. 河海大学土木工程学院,江苏,南京,210098 |
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| 摘 要： | 混凝土裂缝前缘存在断裂过程区,以往研究混凝土断裂韧度KIC尺寸效应时未考虑断裂过程区的影响.为此,基于Weibull脆性破坏统计理论,在考虑混凝土裂缝亚临界扩展条件的基础上对三点弯曲试件混凝土KIC尺寸效应换算公式进行了修正,并通过一组试验数据得到了便于工程应用的KIC尺寸效应换算公式的近似表达式.
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| 关 键 词： | 混凝土 三点弯曲试件 断裂韧度 尺寸效应 断裂过程区 |
| 文章编号： | 1000-1980（2007）01-0063-04 |
| 修稿时间： | 2005-05-30 |
Modification of size effect formula of fracture toughness of concrete for three-point bending specimens |
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| CAO Liang,WANG Xiang-dong.Modification of size effect formula of fracture toughness of concrete for three-point bending specimens[J].Journal of Hohai University (Natural Sciences ),2007,35(1):63-66. |
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| Authors: | CAO Liang WANG Xiang-dong |
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| Institution: | 1. College of Civil Engineering, Hohai University, Nanjing 210098, China ; 2. Nantong Architecture Design Institute, Nantong 226006, China |
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| Abstract: | In the previous study on the size effect of fracture toughness of concrete,the influences of fracture process zones,which occur at the front edge of concrete cracks,are not taken into account.In consideration of the above fact,the size effect formula for fracture toughness K_(IC) of three-point bending concrete specimens was modified based on the Weibull statistical theory with sub-critical expansion of concrete cracks taken into account.Moreover,an approximate expression for the formula of fracture toughness convenient for engineering application was deduced based on a set of experimental data. |
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| Keywords: | concrete three-point bending specimen fracture toughness size effect fracture process zone |
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