Use of fracture mechanics concept to interpret crack resistance behavior of fiber reinforced concrete

Journal of Chongqing Jiaotong University(Natural Science) ›› 2004, Vol. 23 ›› Issue (6): 43-45.

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Use of fracture mechanics concept to interpret crack resistance behavior of fiber reinforced concrete

YI Zhi-jian¹, YANG Qing-guo¹, LI Zu-wei², DENG Wei-dong³ , ZHONG Ning²

1.Chongqing Jiaotong University,Chongqing 400074, China; 2. Chongqing Northern Expressway, Co., Ltd. Chongqing 401147, China; 3. Chongqing Jiaotong Research & Design Institute, Chongqing 400067, China

Received:2004-03-01 Online:2004-12-15 Published:2015-05-18

基于断裂力学原理的纤维砼阻裂机理分析

易志坚¹，杨庆国¹，李祖伟，²邓卫东，³钟宁²

1.重庆交通学院，重庆400074;2.重庆北方高速公路有限公司，重庆401147;3.重庆交通科研设计院，重庆400067

作者简介:易志坚（1963—），男，重庆市长寿人，教授，国家百千万人才工程第一、二层次人选，国家级有突出贡献的中青年专家，从事土木、力学研究
基金资助:
国家自然科学基金(50278102)、重庆市重大科技专项(7194)和交通部西部交通建设科技项目(2003 318 814 29)资助

Abstract

Abstract: The K-superposition method has been improved in this paper to interpret the crack arresting mechanism of fiber reinforced concrete. A simple and direct approach has been introduced based on the Linear Elastic Fracture Mechanics (LEFM). The behavior of fibers in the process of crack arresting has been revealed fundamentally. It has been shown that the stress intensity factor due to the fiber is extremely great at the moment the crack just strides cross the crack, which greatly reduces the total a

Key words: fiber reinforced concrete, fracture, stress intensity factor, crack

摘要： 采用K叠加方法分析了纤维增强砼的断裂及疲劳机理。基于线弹性断裂力学原理的分析表明，在裂纹尖端越过纤维的瞬间，纤维引起的裂尖闭合力将使裂纹产生巨大的反向应力强度因子，从而从根本上阻止裂纹的进一步发展。笔者从全新角度揭示了纤维在砼中的阻裂机理，表明纤维的阻裂作用是十分显著的。

关键词: 纤维增强砼, 断裂, 应力强度因子, 裂纹

CLC Number:

YI Zhi-jian, YANG Qing-guo, LI Zu-wei, DENG Wei-dong , ZHONG Ning. Use of fracture mechanics concept to interpret crack resistance behavior of fiber reinforced concrete[J]. Journal of Chongqing Jiaotong University(Natural Science), 2004, 23(6): 43-45.

易志坚，杨庆国，李祖伟，邓卫东，钟宁. 基于断裂力学原理的纤维砼阻裂机理分析[J]. 重庆交通大学学报（自然科学版）, 2004, 23(6): 43-45.

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Use of fracture mechanics concept to interpret crack resistance behavior of fiber reinforced concrete

基于断裂力学原理的纤维砼阻裂机理分析

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