Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지

Evaluation of Flexural Strength Capacity of Large Scale RC Slabs Strengthened with Prestressed CFRP Plate

긴장된 CFRP판으로 보강된 대규모 RC 슬래브의 휨성능 평가

  • Hong, Ki-Nam (Department of Civil Engineering, Chungbuk National University) ;
  • Han, Sang-Hoon (Department of Civil Engineering, Chungbuk National University) ;
  • Lee, Byong-Ro (Department of Civil Engineering, Chungbuk National University) ;
  • Gwon, Yong-Gil (Korea Institute of Water and Environment) ;
  • Woo, Sang-Kyun (Korea Institute of Water and Environment)
  • Received : 2009.08.19
  • Accepted : 2010.04.20
  • Published : 2010.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents the results of a study on flexural capacity of large size RC slabs strengthened with carbon fiber reinforced polymer(CFRP) plates. A total of 5 specimens of 6.0m length were tested in four point bending after strengthening them with externally bonded CFRP plates. The CFRP plates were bonded without prestress and with two prestress levels, 0.4% and 0.6% of CFRP plate strain. Test variables included the type of strengthening, prestressing level, and the effects according to each test variables are analysed. The experimental results show that proposed methods can increase significantly the flexural capacity such as strength, stiffness of the beam and the increase ranged between 36.2% and 63.2% of the load-carrying capacity of the control beams. The non-prestressed specimen failed by separation of the plate from the beam due to premature debonding while most of the prestressed specimens failed by CFRP plate fracture. And the cracking loads and maximum loads were increased proportionally to the prestress level.

Keywords

References

  1. 오용복, 권영웅, "탄소섬유쉬트 보강된 철근콘크리트 보의 보강철근비에 따른 구조적 거동", 콘크리트학회지, 제10권, 제2호, pp. 119-126, 1998.
  2. 심종성, 배인환, "탄소섬유쉬트로 보강된 철근콘크리트의 계면박리에 대한 해석적 연구", 콘크리트학회지, 제11권, 제2호, pp. 177-186, 1999.
  3. 김규선, 김종성, "보강판으로 성능개선된 RC보의 조기파괴거동", 대한토목학회논문집, 제19권, 제1-4호, pp. 561-570, 1999.
  4. 양동석, 박선규, 이용학, "강연선 및 탄소섬유쉬트로 보강된 철근콘크리트 보의 휨거동 특성", 콘크리트학회논문집, 제14권, 제2호, pp. 216-222, 2002.
  5. 박상렬, 김태우, "CFRP판으로 부착된 R.C 보의 복부정착 형태에 따른 보강효과", 대한토목학회논문집, 제23권, 제6A호, pp. 1113-1121, 2003.
  6. ACI Committee 440, "Guide for the Design and Construction of Externally Bonded FRP systems for Strengthening Concrete Structures(ACI 440.2R-02)", American Concrete Institute, Farmington Hills, Ml. p. 45, 2002.
  7. CNR.Italian Research Council, Advisory Committee on Technical Recommendations for Construction, "Guide for the Design and Construction of Externally Bonded FRP systems for Strengthengin Existing Structures. Materials, RC and PC Structures, Masonry Structures(CNR-DT 200/2004)", Rome, Italy, pp.144, 2004.
  8. Garden, H. N., and Hollaway, L. C., "An Experimental Study of the Failure Modes of Reinforced Concrete Beams Strengthened with Prestressed Carbon Composite Plates", Composites Part B, Vol. 29, pp. 411-424, 1998. https://doi.org/10.1016/S1359-8368(97)00043-7
  9. Quantrill, R. J., and Hollaway, L. C., "The Flexural Rehabilitation of Reinforced Concrete Beams by the Use of Prestressed Advanced Composite Plates", Composites Science and Technology, Vol. 58, pp.1259-12,1998. https://doi.org/10.1016/S0266-3538(98)00002-5
  10. 양동석, 박준명, 유영찬, 박선규, "프리스트레스트 탄소판으로 보강된 철근콘크리트보의 휨거동 및 해석", 한국콘크리트학회 논문집, 제19권, 제2호, pp. 467-474, 2007.
  11. 우상균, 홍기남, 한상훈, 송영철, "CFRP판으로 프리스트레싱 보강된 RC 보의 휨강도 해석", 한국구조물진단학회지, 제11권, 제1호, pp. 181-192, 2007.
  12. 한국건설기술연구원, 외부프리스트레스트 탄소 섬유판에 의한 구조물 보강공법 개발, 건설교통부연구개발사업, E01-01, 2004-2205.
  13. 김형수, 흉기남, 우상균, 송영철, 한상훈, "프리스트레스를 가한 CFRP판으로 보강한 철근콘크리트 보의 휨성능 개선", 한국콘크리트학회 봄학술발표대회논문집, 제17권, 제1호, pp. 471-474, 2005.