Fatigue Analysis of Single Cracked RC Beam Strengthened with FRP

doi:10.3969/j.issn.1674-0696.2014.06.04

Abstract

Abstract: The crack influence factor was introduced to describe the stress concentration phenomenon near the crack. The displacement response of reinforced beam under simple harmonic load was calculated by using the Hamilton energy principle. The stress intensity factor and the fatigue life of crack propagation were obtained by using displacement response of the reinforced beam combined with Paris formula.The results of theoretical calculation were contrasted with the results of finite element analysis. The results show that the crack stress intensity factor and fatigue crack propagation life are sensitive to load, and the results of theoretical method have good agreement with the results of finite element simulation.

Key words: bridge engineering;cracked RC beam, energy principle, crack influence factor, harmonic oscillation, fatigue

摘要： 通过引入裂纹影响因子来描述裂纹产生的应力集中现象，利用Hamilton能量原理求解加固梁在简谐载荷作用下的位移响应，并将加固梁的动态位移响应与Paris公式相结合，得到了加固梁在简谐载荷作用下裂纹处的应力强度因子和疲劳主裂纹扩展寿命。最后将理论计算结果与有限元分析结果进行对比研究。结果表明，裂纹处的应力强度因子和疲劳主裂纹扩展寿命对载荷较为敏感，且该方法的理论值与有限元模拟的结果吻合得较好。

关键词: 桥梁工程, 裂纹RC梁, 能量原理, 裂纹影响因子, 谐振动, 疲劳

CLC Number:

Liu Feng, Chen Deliang. Fatigue Analysis of Single Cracked RC Beam Strengthened with FRP[J]. Journal of Chongqing Jiaotong University(Natural Science), 2014, 33(6): 13-17.

刘锋，陈得良. FRP加固具单裂纹RC梁疲劳分析[J]. 重庆交通大学学报（自然科学版）, 2014, 33(6): 13-17.

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