Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Bond Properties of GFRP Rebar in Fiber Reinforced Concrete (Engineered Cementitious Composite)

섬유보강 콘크리트(ECC)와 GFRP 보강근의 부착 특성

  • Choi, Yun-Cheul (Dept. of Architectural Environmental Engineering and Building Service, ChungWoon Univ.) ;
  • Park, Keum-Sung (Korea Institute of Construction Technology) ;
  • Choi, Chang-Sik (Dept. of Architectural Engineering, Hanyang University) ;
  • Choi, Hyun-Ki (Dept. of Architectural Engineering, Hanyang University)
  • 최윤철 (청운대학교 건축설비소방학과) ;
  • 박금성 (한국건설기술연구원 건축도시연구본부) ;
  • 최창식 (한양대학교 건축공학부) ;
  • 최현기 (한양대학교 건축공학부)
  • Received : 2011.09.15
  • Accepted : 2011.11.02
  • Published : 2011.12.31
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Abstract

An experimental investigations on the bond-slip properties of the steel and Glass Fiber Reinforced Polymer(GFRP) bars in engineered cementitious composite (ECC) with Polyvinyl Alcohol (PVA) fibers are presented. Total of 8 beam specimens prepared according to the Rilem procedures with 2% of PVA and PE fiber volume percentage and steel and GFRP reinforcements significantly changed the failure mechanism and slightly improved bond strength. The main objective of the tests was to evaluate the load versus displacement and load versus slip behaviors and the bond strength for the following parameters: concrete type (normal and fiber concrete) and bar diameter (10 and 13 mm). The study results showed that ordinary concrete and ECC specimens showed similar behavior for steel reinforced specimen. However, GFRP reinforced specimen showed different behavior that the steel specimen. The code analytical results showed more accuracy compared to the experimental results as expected in conservative code provisions. Based on the obtained results, it is safe to conclude that the new parameters need to be adopted to ensure safe usage of ECC for construction applications.

철근과 GFRP bar의 콘크리트 및 PVA가 사용된 ECC에서의 부착-미끌림 관계를 실험을 통해 평가하였다. 총 8개의 최대하중 발현 이후 파괴 모드가 크게 변경되고 부착강도의 증진을 예상할 수 있는 PVA 및 PE가 2% 부피비로 혼입된 ECC로 제작된 RILEM 기준에 따른 실험체가 제작되었다. 이 연구의 목적은 ECC 및 GFRP가 사용되었을 경우 하중-변위 관계 및 부착응력-미끌림 관계를 다음과 같은 변수에 따라 파악하는 것이다. 1) 콘크리트의 종류(보통 콘크리트, 섬유보강 콘크리트), 2) 보강근의 직경(10 mm, 13 mm) 실험 결과 콘크리트와 ECC는 철근에 대한 실험체는 유사한 거동을 하였지만 GFRP에 대해서는 서로 다른 거동을 보였다. 기존 연구로 제안된 평가 방법은 실험 결과와 유사한 값을 나타내었지만 부착강도를 과대평가하는 경향을 보였으며 설계기준으로도 사용되는 ACI 위원회 제안식은 보수적인 결과를 타나내었다.

Keywords

References

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