Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Structural Behavior of Hybrid Steel Fiber-Reinforced Ultra High Performance Concrete Beams Subjected to Bending

휨을 받는 하이브리드 강섬유 보강 초고성능 콘크리트 보의 구조 거동

  • Yang, In-Hwan (Department of Civil Engineering, Kunsan National University) ;
  • Kim, Kyoung-Chul (Department of Civil Engineering, Kunsan National University) ;
  • Joh, Chang-Bin (Structural Engineering Research Division, Korea Institute of Construction Technology)
  • 양인환 (군산대학교 토목공학과) ;
  • 김경철 (군산대학교 토목공학과) ;
  • 조창빈 (한국건설기술연구원 인프라구조연구실)
  • Received : 2014.09.15
  • Accepted : 2014.10.20
  • Published : 2014.12.31
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Abstract

This paper concerns the flexural behavior of hybrid steel fiber-reinforced ultra high performance concrete (UHPC) beams. It presents experimental research results of hybrid steel fiber-reinforced UHPC with steel fiber content of 1.5% by volume and steel reinforcement ratio of less than 0.02. This study aims at providing realistic information about UHPC beams in bending in order to establish a reasonable prediction model for flexural resistance in structural code in the future. The experimental results show that hybrid steel fiber-reinforced UHPC is in favor of cracking resistance and ductility of beams. The ductility indices range through 9.2 to 15.2, which means high ductility of UHPC. Also, the flexural capacity of beam which contains stirrups in pure bending zone is similar to that of beam which does not contain stirrups in pure bending zone. This result represents that the flexural capacity is not affected by the presence of stirrups whose spacing is 150 mm in bending zone.

본 연구에서는 하이브리드 강섬유로 보강된 초고성능 콘크리트(UHPC)의 휨거동 특성을 파악하고자 하였다. 부피비 1.5%의 하이브리드 강섬유를 혼입하여 철근비가 0.02 이하인 부재의 실험을 통해 주요 휨거동 특성을 파악하였다. 본 연구결과는 추후 UHPC의 휨강도 산정 모델링에 실제적인 기초실험자료로 활용될 수 있을 것으로 사료된다. 하이브리드 강섬유 보강 UHPC는 균열제어에 효과적이며, 연성지수는 9.2~15.2 범위에 분포하고 있어 우수한 연성거동 특성을 나타낸다. 또한, 순수 휨 구간 내에 스터럽을 배근한 부재의 휨강도는 스터럽을 배근하지 않은 부재의 휨강도와 유사하며, 이 실험연구의 150 mm 간격 정도의 스터럽 배근은 강섬유 배열 및 휨강도에 영향을 미치지 않는다고 판단된다.

Keywords

References

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  2. Material Properties and Structural Characteristics on Flexure of Steel Fiber-Reinforced Ultra-High-Performance Concrete vol.28, pp.2, 2016, https://doi.org/10.4334/JKCI.2016.28.2.177