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Structural Engineering and Mechanics
  Volume 14, Number 5, November 2002, pages 565-574

Prediction of premature separation of bonded CFRP plates from strengthened steel beams using a fracture criterion
Lenwari A, Thepchatri T, Watanabe E

    This paper presents a method for predicting premature separation of carbon fiber reinforced plastic (CFR-P) plates from strengthened steel beams. The fracture criterion based on material-induced singularity is formulated in terms of a singular intensity factor. Static test on double strap joints was selected to provide the critical stress intensity factor in the criterion because good degree of accuracy and consistency of experimental data can be expected compared with the unsymmetrically loaded single lap joints. The debond/separation loads of steel beams with different CFRP lengths were measured and compared with those predicted from the criterion. Good agreement between the test results and the prediction was found.
Key Words
    fracture, stress singularity, strengthening, CFRP, steel beams, bridges, bi-material wedges, double strap joints
Lenwari A, Chulalongkorn Univ, Dept Civil Engn, Bangkok 10330, Thailand
Chulalongkorn Univ, Dept Civil Engn, Bangkok 10330, Thailand
Kyoto Univ, Dept Civil Engn, Kyoto 6068501, Japan

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