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2025 Vol.26, Issue 9 Preview Page
Evaluation of Flexural Capacity of Steel Fiber Reinforced Concrete Members by Volume Fraction of Steel Fiber

강섬유 혼입률에 따른 강섬유보강콘크리트 부재 휨 성능 평가

Inho Park1
,
Daehee Kang1
,
Sunhee Kim2
,
Wonchang Choi3*
박 인호1
,
강 대희1
,
김 선희2
,
최 원창3*
1Master’s Course, Department of Architectural Engineering, Gachon University
2Assistant Professor, Department of Architectural Engineering, Gachon University
3Professor, Department of Architectural Engineering, Gachon University
*Corresponding Author
1 September 2025. pp. 13-20
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Abstract

In this study, the flexural performance of steel fiber reinforced concrete(SFRC) beams incorporating hooked-end steel fiber was evaluated through flexural test, and the results were compared with existing flexural strength prediction models proposed in previous studies. The main variable was the fiber volume fraction, with mixing ratios of 0%, 0.5% and 1.0% by volume of concrete. Material test were conducted to assess the mechanical properties: although compressive strength decreased due to fiber ball effect, both flexural strength and splitting tensile strength improved. The flexural test of SFRC beams demonstrated that the maximum load, deflection, and ductility index increased with higher fiber volume fraction. As a result of comparing the results of this study with the existing flexural capacity prediction equation, it was confirmed that it is possible to increase the flexural capacity through the reinforcement effect of more than 57.59% of the tensile force caused by tensile reinforcement when reinforced with more than 0.5% of steel fiber.

Keywords
Hooked-end steel fiber
SFRC
Flexural performance
Ductile behavior

본 연구에서는 양단 후크형 강섬유를 혼입한 강섬유 보강 콘크리트 보의 휨 실험을 통해 휨 성능을 평가하고, 기존 선행연구에서 제시한 휨 내력 예측식을 활용하여 본 연구의 실험 결과와 비교를 진행하였다. 변수는 강섬유의 혼입률이며, 콘크리트 체적비의 0%, 0.5%, 1.0%만큼 혼입하였다. 강섬유 보강 콘크리트의 재료시험 결과, 압축강도의 향상은 나타나지 않았으나, 휨 강도와 쪼갬 인장강도는 모두 증가하였다. 강섬유 보강 콘크리트 보의 휨 실험을 통해 강섬유 혼입률이 증가함에 따라 부재의 최대하중, 처짐량, 연성지수가 증가하는 것으로 나타났다. 강섬유 보강 콘크리트 보의 휨 실험을 통해 강섬유의 혼입으로 철근콘크리트 부재의 연성 거동을 유도하는 것에 있어 효과적인 방안임을 확인하였다. 기존의 휨 내력 예측식을 활용하여 본 연구의 결과와 비교한 결과, 강섬유 혼입률 0.5% 이상 혼입하여 보강하였을 경우 인장철근에 의한 인장력의 57.59% 수준 이상의 보강 효과를 통해 휨 내력을 제고시키는 것이 가능함을 확인하였다.

키워드
후크형 강섬유
강섬유 보강 콘크리트
휨 성능
연성 거동
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Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 26
  • No :9
  • Pages :13-20
  • Received Date : 2025-07-04
  • Revised Date : 2025-07-14
  • Accepted Date : 2025-08-07
  • DOI :https://doi.org/10.14481/jkges.2025.26.9.13
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