Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (10): 184-189.doi: 1000-565X(2012)10-0184-06

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Fatigue Behavior of CFRP-Concrete Interface

Huang Pei-yan1,2  Zheng Xiao-hong1  Zhou Hao1  Guo Xin-yan1  Han Qiang1   

  1. 1. School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China; 2. State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-07-10 Online:2012-10-25 Published:2012-09-01
  • Contact: 黄培彦(1952-) ，男，教授，博士生导师，主要从事疲劳与断裂、桥梁结构耐久性研究． E-mail:pyhuang@ scut.edu.cn
  • About author:黄培彦(1952-) ，男，教授，博士生导师，主要从事疲劳与断裂、桥梁结构耐久性研究．
  • Supported by:

    国家自然科学基金重点资助项目( 11132004) ; 广东省自然科学基金重点资助项目( 9251064101000016)

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Abstract:

In order to verify the fatigue resistance performance of the CFRP( Corbon Fiber Reinforced Plastic) - concrete interface,the bonded interface is taken as the research objective and the double-shear fatigue specimens are designed to test the fatigue performance of the CFL ( Carbon Fiber Laminate) -concrete interface under cyclic loading. Then,the relative slip evolution curves ( the relative slip of the specimen-fatigue life experimental curves) of the CFL-concrete interface are presented,and its strain and bond-slip laws are analyzed. The experimental results show that ( 1) under the fatigue load,the strain evolution on the CFL consists mainly of three steps of force transmission,namely,the early rapid step,the stable step and the instable step,in which the stable force transmission step accounts for 95% of the whole process; ( 2) the relative slip evolution of the specimens is also divided
into three steps,namely,the early rapid growth step,the stable growth step and the instable growth step; and ( 3) at the stable growth step,there exists a near-linear relationship between the relative slip of the specimen and the fatigue life. Finally,a fatigue damage model of the CFL-concrete interface is proposed based on the stiffness coefficient. By using this model,the damage evolution law of the CFL-concrete interface in the fatigue process can be conveniently derived.

Key words: corbon fiber reinforced plastic, concrete interface, fatigue damage, bond-slip, carbon fiber laminate, stiffness coefficient