KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Debonding Failure Model for RC Beams Strengthened with Externally Bonded Prestressed CFRP Plates

탄소섬유판 긴장재로 외부 긴장 보강된 철근콘크리트 보의 부착파괴 모델

  • 박종섭 (한국건설기술연구원 구조시스템연구실) ;
  • 정우태 (한국건설기술연구원 구조시스템연구실) ;
  • 박영환 (한국건설기술연구원 구조시스템연구실)
  • Received : 2007.12.11
  • Accepted : 2008.01.25
  • Published : 2008.07.31
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Abstract

This paper suggests a modified debonding failure model for the externally bonded prestressed CFRP plate strengthening system. In order to reduce the error that may occur in the experimental results, statistical analysis of the experimental results produced by previous researchers was conducted to propose a debonding failure model. The experimental results of beams strengthened with bonded CFRP plates have made it possible to verify the debonding failure occurring before the final failure in the prestressing system. The corresponding strain increased with the effective prestress. Accordingly, the debonding failure model was modified by considering the effective prestress so as to fit with the CFRP prestressing system.

본 논문에서는 CFRP판으로 긴장 보강된 철근콘크리트 보의 부착파괴를 해석하기 위한 수정된 부착파괴 모델를 제안하였다. 부착파괴 모델은 한정된 실험결과로부터 발생할 수 있는 오류를 줄이기 위해 선행연구자들의 실험결과를 통계적으로 분석하여 제안하였다. 부착 CFRP판으로 긴장 보강된 보에 대한 실험을 통해 긴장 보강 시스템에서 최종파괴 이전에 부착파괴가 발생하는 것을 확인하였으며, 부착파괴 변형률은 유효프리스트레스의 크기에 따라 증가하는 것을 검증하였다. 따라서 부착거동 특성 연구에서 도출된 부착파괴 해석모델은 긴장 시스템에 적합하도록 유효프리스트레스를 고려할 수 있도록 수정 제안하였다.

Keywords

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