Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (2): 23-26.

• Mechanics • Previous Articles     Next Articles

Fatigue Açcumulative Damage Model of RC Beam Strengthened with Carbon Fiber Laminate

Niu Peng-zhi1  Huang Pei-yαn1  yao Guo-wen2  Yang Yi1  Zhao Chen1   

  1. 1. School of Traffic and Communications , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. College of Civil Engineering and Architecture , Chongqing Jiaotong Univ. , Chongqing 400074 , China
  • Received:2005-04-12 Online:2007-02-25 Published:2007-02-25
  • Contact: 牛鹏志(1978-)，男，博士生，主要从事疲劳与断裂力学和FRP 片材加固技术研究。 E-mail:Pyhuang@scut. edu. cn
  • About author:牛鹏志(1978-)，男，博士生，主要从事疲劳与断裂力学和FRP 片材加固技术研究。
  • Supported by:

    国家自然科学基金资助项目(10272047,10672060) ;广东省自然科学基金资助项目(020856)

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Abstract:

The three-point hending experiments of the reinforced concrete (RC) heam strengthened with carbon fi-her laminate (CFL) were carried out , and the corresponding fatigue life curve was ohtained. Moreover , the evolu-tion histories of midspan flexihility and hending rigidity of the strengthened heam were descrihed. The residual ben-ding rigidity was then used to define the damage of the strengthened heam. Thus , a fatigue accumulative damage model was proposed to analyze the damage and fracture process of the strengthened heam. The evolution of the fa-tigue damage of the RC heam strengthened with CFL was finally calculated and discussed. The results show that the proposed model can correctly descrihe the damage and failure processes of CFL-strengthened RC heam , including the concrete cracking , the CFL dehonding from the concrete and the yielding of the steel har.

Key words: carhon fiher laminate ( CFL), reinforced concrete ( RC ) beam, fatigue life, accumulative damage model, bending rigidity