콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제17권6호
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  • Pages.983-992
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  • 2005
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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연속섬유에 의하여 보강된 철근콘크리트 보의 전단강도 평가

Evaluation of the Shear Strength of Reinforced Concrete Beams Strengthened with Continuous fiber Reinforced Polymer

  • 이정윤 (성균관대학교 건축공학과) ;
  • 황현복 (성균관대학교 건축공학과) ;
  • 김지현 (성균관대학교 건축공학과)
  • Lee Jung-Yoon (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Hyang Hyun-Bok (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Kim Ji-Hyun (Dept. of Architectural Engineering, Sungkyunkwan University)
  • 발행 : 2005.12.01
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초록

섬유에 의하여 보강된 철근콘크리트 보의 파괴모드는 섬유가 파단하여 전단강도에 도달하는 경우와 섬유가 파단하기 이전에 전단강도에 도달하는 경우로 나누어진다. 이와 같이 섬유가 파단강도에 도달하지 않는 경우에 두 파괴모드의 전단강도는 상이하다. 섬유가 파단하지 않고 전단강도에 도달할 경우에 보의 전단강도를 예측하기 위하여 섬유의 파단강도를 사용할 수 없으므로 기존의 제안식에서는 섬유강도저감계수를 사용하여 섬유보강 보의 전단강도를 예측하였다. 그러나 기존 제안식의 대부분은 실험결과에 근거한 회귀분석을 통하여 일정한 상수 값에 의하여 섬유강도저감계수를 평가하였으며, 섬유의 도달강도와 밀접한 관계가 있는 콘크리트의 압축강도를 고려하지 않고 있다. 이 연구에서는 변형률의 적합조건을 이용한 트러스모델에 근거하여 섬유보강 보의 파괴모드의 경계점을 구별하고, 이를 이용하여 섬유보강 보의 전단강도를 예측하였다.

The shear failure modes of fiber reinforced polymer(FRP) strengthened concrete beams are quite different to those of the beams strengthened with steel stirrups. When the beams are strengthened with larger amount of FRP composites, the beams normally fail in shear due to concrete crushing before the FRP reaches its rupture strain. In order to predict the shear strength of such beams, the actual rupture strain must be known. The equations previously reported in the technical literature adopt an effective reduction factor for the rupture strain. These equations may not be applicable to FRP strengthened RC beams that are beyond the experimental application limits, because most of these equations are empirical in nature. This paper presents the results of an analytical study on the performance of reinforced concrete beams externally wrapped with FRP composites and internally reinforced with conventional steel stirrups.

키워드

참고문헌

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