Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Flexural Strength of Hybrid Steel Fiber-Reinforced Ultra-High Strength Concrete Beams

하이브리드 강섬유 보강 초고강도 콘크리트 보의 휨강도

  • Yang, In-Hwan (Dept. of Civil Engineering, Kunsan National University) ;
  • Kim, Kyoung-Chul (Dept. of Civil Engineering, Kunsan National University) ;
  • Joh, Chang-Bin (Structural Engineering & Bridges Research Division, Korea Institute of Civil Engineering and Building Technology)
  • 양인환 (군산대학교 토목공학과) ;
  • 김경철 (군산대학교 토목공학과) ;
  • 조창빈 (한국건설기술연구원 구조융합연구소)
  • Received : 2014.12.22
  • Accepted : 2015.01.21
  • Published : 2015.06.30
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Abstract

This paper proposes a method for predicting flexural strength of hybrid steel fiber-reinforced ultra-high strength concrete beams. It includes an experimental test framework and associated numerical analyses. The experimental program includes flexural test results of hybrid steel fiber-reinforced ultra-high strength concrete beams with steel fiber content of 1.5% by volume. Tensile softening characteristics play an important role in the structural behavior of steel fiber-reinforced ultra high performance concrete. Tension softening modeling is carried out by using crack equation based on fictitious crack and inverse analysis in which load-crack mouth opening displacement relationship is considered. The comparison of moment-curvature curves of the numerical analysis results with the test results shows a reasonable agreement. Therefore, the numerical results confirms that good prediction of flexural behavior of steel fiber-reinforced ultra high strength concrete beams can be achieved by employing the proposed method.

이 논문에서는 하이브리드 강섬유로 보강된 콘크리트의 부재의 휨강도를 예측하기 위한 수치해석기법을 제시하였다. 이를 위해 휨을 받는 하이브리드 강섬유 보강 콘크리트 실험과 수치해석연구를 수행하였다. 부피비 1.5%의 하이브리드 강섬유 보강 초고강도 콘크리트의 휨거동 특성 실험을 수행하였다. 강섬유보강 콘크리트의 인장연화특성은 구조적 거동에 매우 중요한 역할을 하며, 하이브리드 강섬유 보강 초고강도 콘크리트의 하중-균열개구변위 실험결과를 반영하여 가상균열모델에 근거한 역해석에 의해 인장연화모델링을 수행하였다. 제안기법에 의한 콘크리트 보의 모멘트-곡률 수치해석결과를 실험결과와 비교하였으며, 수치해석결과와 실험결과는 전반적으로 잘 일치하고 있다. 따라서, 제안기법에 의해 강섬유 보강 초고강도 콘크리트 보의 휨강도를 합리적으로 예측할 수 있다고 판단된다.

Keywords

References

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