Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Technical Trend of Concrete Member with GFRP Bar and Tension Stiffening Effect

GFRP 보강근 배근 콘크리트 기술동향 및 인장강화 효과 분석

  • Won-Jun Lee (Korea Institute of Industrial Technology) ;
  • Seong-Cheol Lee (Kyungpook National University) ;
  • Jung-Woo Cho (Korea Institute of Industrial Technology)
  • 이원준 (한국생산기술연구원) ;
  • 이성철 (경북대학교) ;
  • 조정우 (한국생산기술연구원)
  • Received : 2024.10.07
  • Accepted : 2024.10.18
  • Published : 2024.10.31
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Abstract

Steel rebar is commonly used as reinforcement in reinforced concrete (RC) structures. However, steel rebar corrodes over time, leading to a significant reduction in structural safety as the structure ages. Therefore, Glass Fiber Reinforced Plastic (GFRP) rebar, which is not prone to corrosion, has gained attention as a replacement for conventional steel reinforcement. This study investigates the fundamental technology required for applying GFRP rebar to concrete members. Based on this, the bond behavior and tension stiffening effect of GFRP-reinforced members were analyzed. The analysis revealed that key properties of GFRP rebar, such as bond behavior, rebar diameter, and reinforcement ratio, are major factors influencing the tension stiffening effect. To further expand the application of GFRP rebar,it is expected that a new model that accurately reflects the tension stiffening effect will be required.

철근콘크리트 구조물 보강근으로는 일반강 소재가 주로 사용된다. 이 소재는 장기간에 걸쳐 부식이 진행되므로, 구조물이 노후화되면 안전성이 급격히 저하되는 문제가 발생한다. 그래서 부식 우려가 없는 GFRP (Glass Fiber Reinforced Plastic) 보강근이 기존 철근의 대체재로 주목받고 있다. 본 연구는 GFRP 보강근을 콘크리트 부재에 적용하기 위한 기초 기술을 조사하였다. 이를 바탕으로 기존의 GFRP 보강근 부재의 부착거동 및 인장강화 효과에 대해 분석하였다. 그 결과, GFRP 보강근의 부착거동의 반영, 보강근의 지름, 보강근비와 같은 GFRP 보강근의 물성치가 인장강화 효과의 주요 변수로 분석되었다. GFRP 보강근 적용을 확대하기 위해서는 인장강화 효과를 정확히 반영할 수 있는 신규 모델이 필요할 전망이다.

Keywords

Acknowledgement

본 연구는 2024년도 국토교통부(국토교통과학기술진흥원)의 'TBM 굴진향상을 위한 연속굴착 기술개발(RS-2022-00144188)' 사업을 통해 수행되었습니다.

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