Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Bond-Slip Model of Interface between CFRP Sheets and Concrete Beams Strengthened with CFRP

탄소섬유시트로 보강된 콘크리트보의 경계면 부착-슬립모델

  • Kim, Sung-Bae (Dept. of Civil and Environmental System Engineering, Yonsei University) ;
  • Kim, Jang-Ho Tay (Dept. of Civil and Environmental System Engineering, Yonsei University) ;
  • Nam, Jin-Won (Dept. of Civil and Environmental System Engineering, Yonsei University) ;
  • Kang, Suk-Hwa (Dept. of Civil Engineering, Hanwha Engineering & Construction) ;
  • Byun, Keun-Joo (Dept. of Civil and Environmental System Engineering, Yonsei University)
  • 김성배 (연세대학교 사회환경시스템공학부) ;
  • 김장호 (연세대학교 사회환경시스템공학부) ;
  • 남진원 (연세대학교 사회환경시스템공학부) ;
  • 강석화 (한화건설) ;
  • 변근주 (연세대학교 사회환경시스템공학부)
  • Published : 2008.08.31
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Abstract

External bonding of carbon fiber reinforced plastic sheets has recently emerged as a popular method for strengthening reinforced concrete structures. The behavior of CFRP-strengthened RC structure is often controlled by the behavior of the interface between CFRP sheets and concrete. In this study, a review of models on bond strength, bond-slip, and interfacial stresses has been first carried out. Then a new bond-slip model is proposed. The proposed bond-slip model has bilinear ascending regions and exponential descending region derived from modifications mode on the conventional bilinear bond-slip model. The comparison of the results with those of existing experiment researches on bond-slip models indicate good agreements.

탄소섬유시트 보강공법은 콘크리트구조물의 보강에 많이 사용되는 보강공법이다. 이러한 탄소섬유 보강공법에서는 콘크리트와 CFRP시트 사이의 경계면 거동이 전체 보강구조물의 거동을 지배하게 된다. 본 연구에서는 탄소섬유시트 보강공법을 적용한 콘크리트구조물의 경계면 거동에 대한 기존의 연구들을 고찰하고, 이를 바탕으로 경계면 부착거동해석에 효과적으로 사용될 수 있는 새로운 bond-slip model을 제시하고, 경계면의 부착거동을 해석할 수 있는 해석 기법을 제안하였다. 새롭게 제시된 bond-slip model은 기존의 bilinear bond-slip model을 개선한 것으로서, 전단응력이 증가하는 구간을 2개의 직선구간으로 구성하고, 전단응력이 감소하는 구간을 지수함수로 구성한 것이다. 제안된 bond-slip model은 기존의 부착전단 실험 결과 및 경계면 거동 모델들과의 비교를 통하여 검증하였다.

Keywords

References

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