Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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An Experimental Study on Flexural Behavior of Steel Fiber Reinforced Ultra High Performance Concrete

강섬유로 보강된 초고성능 콘크리트의 휨 거동에 대한 실험 연구

  • Yang, In-Hwan (Dept. of Civil Engineering, Kunsan National University) ;
  • Joh, Chang-Bin (Dept. of Structures & Bridges, Korea Institute of Construction Technology) ;
  • Kang, Su-Tae (Dept. of Structures & Bridges, Korea Institute of Construction Technology) ;
  • Kim, Byung-Suk (Dept. of Structures & Bridges, Korea Institute of Construction Technology)
  • 양인환 (군산대학교 토목공학과) ;
  • 조창빈 (한국건설기술연구원 구조교량연구실) ;
  • 강수태 (한국건설기술연구원 구조교량연구실) ;
  • 김병석 (한국건설기술연구원 구조교량연구실)
  • Published : 2009.12.31
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Abstract

In this study, the flexural behavior of steel fiber reinforced ultra high performance concrete (UHPC) was investigated. It presents experimental results of steel fiber reinforced UHPC with steel fiber content of 2% by volume and steel reinforcement ratio of less than 0.02. This study aims at providing more information about UHPC beams in bending in order to establish a reasonable prediction model for flexural resistance and deflection in structural code in the future. The experimental results show that UHPC is in favor of cracking behavior and ductility of beams, and that the ductility indices range from 6.29 to 10.44, which means high ductility of UHPC. Also, the flexural rigidity of beam whose cast is begun from end of beam is larger than that of beam whose cast is begun from midspan of beam. This result represents that the flexural rigidity is affected by the placing method of UHPC.

이 연구에서는 강섬유로 보강된 초고성능 콘크리트(UHPC)의 정적재하 실험을 통하여 UHPC를 적용한 구조 부재의 휨거동 특성을 파악하고자 하였다. 부피비 2%의 강섬유를 혼입하여 철근비가 0.02 이하인 부재의 실험을 통해 주요 휨거동 특성을 파악하였다. 이 연구 결과는 추후 UHPC의 처짐산정 및 휨강도 산정 모델링에 주요한 기초 실험 자료로 활용될 수 있을 것으로 사료된다. 강섬유 보강 UHPC는 균열제어에 효과적이며, 연성지수는 6.29${\sim}$10.44 범위에서 산정되고 있어 우수한 연성거동 특성을 나타낸다. 또한 단부타설 방법으로 제작한 UHPC 보의 휨강도는 중앙타설 방법으로 제작한 UHPC의 휨강도보다 크게 나타나고 있으며, 이는 타설 방법에 의한 강섬유 배열 특성이 휨강도에 영향을 미치고 있음을 나타낸다.

Keywords

References

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