Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Shear Strength Evaluation of Steel Fiber Reinforced Concrete Coupling Beams with Conventional Reinforcements Details

일반 철근 배근 상세를 갖는 강섬유 보강 콘크리트 연결보의 전단강도 평가

  • 송성휘 (한양대학교 대학원 건축공학과) ;
  • 손동희 (한양대학교 대학원 건축공학과) ;
  • 배백일 (한양사이버대학교 디지털건축도시공학과) ;
  • 최창식 (한양대학교 건축공학부)
  • Received : 2022.11.07
  • Accepted : 2023.01.05
  • Published : 2023.02.28
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Abstract

The purpose of this study is to prevent diagonal tension failure of existing conventional coupling beams, increase the shear strength of conventional coupling beams, and quantitatively evaluate the increase. Steel fibers can improve shear strength and partially change the failure mechanism, but this is the result of research on general RC beams and columns, and research on the shear strength enhancement of conventional coupling beams for steel fiber reinforced concrete is still lacking. Therefore, in order to confirm the increased shear strength caused by steel fiber and the resulting change in failure mechanism, three specimens were fabricated with the steel fiber volume fraction as a variable (0%, 1%, 2%) and repeated loading experiments were performed. As a result, the shear strength of the specimens reinforced with steel fibers (1%, 2%) increased as the shear resistance contribution of concrete increased after the maximum strength was developed compared to the specimens without it (0%).

본 연구의 목적은 기존 연결보의 사인장 파괴를 방지하고 연결보의 전단강도를 증가시키며 증가분을 정량적으로 평가하는 것이다. 강섬유는 전단강도를 향상시키고 파괴 메커니즘을 부분적으로 변화시킬 수 있지만 이는 일반적인 RC보와 기둥에 대한 연구결과이며, 강섬유 보강콘크리트에 대한 연결보의 전단강도 증진에 대한 연구는 아직까지 부족한 실정이다. 따라서, 강섬유에 의한 증가된 전단강도와 이에 따른 파괴 메커니즘 변화를 확인하기 위해 강섬유의 혼입률을 변수(0%, 1%, 2%)로 세 개의 실험체를 제작하여 반복가력 실험을 수행하였다. 그 결과, 강섬유를 보강한 실험체(1%, 2%)가 그렇지 않은 실험체(0%) 대비 최대강도 발현 후 콘크리트의 전단저항 기여분이 증가됨에 따라 전단강도가 증진되었다.

Keywords

Acknowledgement

이 연구는 2021년도 정부(과학기술정보통신부) 연구비 지원에 의한 결과의 일부임(과제번호: NRF-2020R1A4A1019 074).

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