Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluation on Shear Contribution of Steel Fiber Reinforced Concrete in Place of Minimum Shear Reinforcement

최소 전단철근 대용으로의 강섬유 콘크리트의 전단기여도 평가

  • Kim, Chul-Goo (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Park, Hong-Gun (Dept. of Architecture & Architectural Engineering, Seoul National University) ;
  • Hong, Geon-Ho (Dept. of Architectural Engineering, Hoseo University) ;
  • Kang, Su-Min (Dept. of Architectural Engineering, Chungbuk National University)
  • Received : 2014.11.18
  • Accepted : 2015.08.17
  • Published : 2015.12.30
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Abstract

In current design codes, minimum shear reinforcement is required for reinforced concrete flexural members, and the use of steel fiber reinforced concrete is permitted to replace the minimum shear reinforcements. In the present study, to estimate the effects of shear reinforcements and fibers on shear strength, simply supported beams were tested under transverse loading. The test results showed that the shear strength was significantly increased by the use of fibers. Particularly, the effect of fiber reinforced concrete was pronounced when high-strength concrete was used. The performance of fiber reinforced concrete for minimum shear reinforcement was evaluated using results of the present study and existing tests.

현행 콘크리트 구조기준에는 전단파괴의 취성적 특성을 고려하여 휨 부재에 최소전단철근을 배근하도록 규정하고 있고, 강섬유 보강 콘크리트 사용시 강섬유가 최소전단철근을 대신하여 사용가능하도록 허용하고 있다. 본 연구에서는 이러한 최소전단철근과 강섬유가 전단강도에 미치는 영향을 단순지지 보 실험을 통해 분석하였다. 실험결과를 살펴보면, 강섬유 보강이 최소 전단철근보다 전단강도에 미치는 영향이 크게 나타났고 특히, 고강도콘크리트가 사용된 경우 강섬유 효과가 크게 발휘되었다. 강섬유 콘크리트의 특성을 살펴보기 위해 기존 실험 자료를 분석하였고 현행 기준에 사용되고 있는 최소전단철근 대용으로의 강섬유 보강 콘크리트 보의 적절성을 평가하였다.

Keywords

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