Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Characteristics of Structural Behavior of Steel Fiber Reinforced Ultra High Performance Concrete Beams Subjected to Torsion

강섬유 보강 초고성능 콘크리트 보의 비틀림 거동 특성

  • Yang, In-Hwan (Dept. of Civil Engineering, Kunsan National University) ;
  • Joh, Changbin (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Jung-Woo (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Kim, Byung-Suk (Korea Institute of Construction Technology)
  • 양인환 (군산대학교 토목공학과) ;
  • 조창빈 (한국건설기술연구원 인프라구조연구실) ;
  • 이정우 (한국건설기술연구원 인프라구조연구실) ;
  • 김병석 (한국건설기술연구원)
  • Received : 2013.09.10
  • Accepted : 2013.11.12
  • Published : 2014.02.28
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Abstract

Experimental investigation on the structural behavior of steel fiber-reinforced ultra high performance concrete (UHPC) beams subjected to torsion are presented. Six tests carried out on square beams under torsional moment are presented. The experimental parameters were the volume fraction of the fibers and closed-stirrup ratio. The volume fraction of the fibers was 1.0% and 2.0%. The closed-stirrup ratio was 0, 0.35%, and 0.70%. The test results indicated that ultimate torsional strength increased with increasing fiber volume, and that ultimate torsional strength also increased with increasing the closed-stirrup ratio. In addition, predictive equations for evaluating the ultimate torsional strength of UHPC beams were proposed. The comparison between computed values and the experimentally observed values was shown to validate the proposed analytical equations. It was found that predictions by using proposed equation provides good agreement with test results of UHPC beams.

이 연구에서는 강섬유 보강 초고성능 콘크리트 보의 비틀림 거동을 파악하기 위한 실험연구를 수행하였다. 정사각형 단면을 갖는 6개의 초고성능 콘크리트 보 부재에 대해 하중재하실험을 수행하여 비틀림 거동 특성을 분석하였다. 부재의 실험변수는 강섬유 혼입량과 폐쇄 스터럽량이다. 강섬유 혼입량은 1.0% 및 2.0%로 변화하였고, 폐쇄 스터럽량은 0, 0.35% 및 0.70%로 변화하였다. 실험 결과는 강섬유양이 증가할수록 극한비틀림강도가 증가하고, 폐쇄스터럽량이 증가할수록 극한비틀림강도가 증가하는 것을 나타낸다. 또한, 비틀림 강도 예측식을 제안하였으며, 예측식은 콘크리트, 스터럽 및 강섬유의 비틀림 강도 기여분을 각각 고려하였다. 실험 결과를 이용하여 초고강도 콘크리트 보의 비틀림 강도 예측식의 적합성을 평가하고자 하였다. 비틀림강도 실험 결과를 예측값과 비교하였으며, 예측값은 실험 결과에 거의 근접하고 있는 것으로 나타났다. 따라서, 제안식을 이용하여 초고성능 콘크리트의 비틀림 강도를 효과적으로 예측할 수 있다고 판단된다.

Keywords

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