Prediction of the Shear Strength of FRP Strengthened RC Beams (I) - Development and Evaluation of Shear strength model -

FRP로 전단 보강된 철근콘크리트 보의 전단강도 예측 (I) - 전단강도 예측 모델제안 및 검증 -

  • Sim Jong-Sung (Dept. of Civil and Environment Engineering, Hanyang University) ;
  • Oh Hong-Seob (Dept. of Civil Engineering, Jinju National University) ;
  • Moon Do-Young (Dept. of Civil and Environment Engineering, Hanyang University) ;
  • Park Kyung-Dong (Div. of Civil Works, LOTTE Engineering & Construction)
  • Published : 2005.06.01


This study developed a shear strength prediction model of FRP strengthened reinforced concrete beams in shear. The primary design parameters were shear crack angle and shear span to depth ratio of FRP reinforcement. Of primary concern In the suggested model was the FRP debonding failure, which Is a typical fracture mode of RC beams strengthened with FRP, The proposed model used a crack sliding model based on modified plasticity theory. To address the effect of the shear span to depth ratio, the arch action was considered in the proposed model. The proposed model was applied to RC beams strengthened with FRP. The results showed that the proposed model agree with test results.


  1. Saadatmanesh, H. and Ebsani, H. R., 'RC Beams Strengthened with GFRP plate I: Experimental Study', Journal of Structural Engineering, ASCE, Vol.117, No.11, 1996, pp.3417-3433
  2. Quantril, R, J., Hooaway L. C., and Tbrone A. M., 'Experimental and analytical investigation of FRP strengthened beam response', Magazine of Concrete Research, Vol.48, No.177, 1996, pp.331-342
  3. Teng J. G., Chen J. F., Smith S. T., and Lam L., FRP Strengthened RC Structures, John Wiley & Sons Ltd, 2002, pp.103-134
  4. 심종성, 연규석, 한만엽, 프리믹스형 보수재료를 적용한 R/C 구조물의 보수 및 섬유보강공법 개발, 건설교통부, 1999
  5. 심종성, 오홍섭, 유재명, '섬유보강재로 전단 보강된 RC보의 전단강도예측을 위한 해석모델에 대한 연구', 콘크리트학회 논문집, 12권, 5호, 2000, pp.35-46
  6. 조병완, 김연진, 김도, '유리섬유보강재를 이용한 Deep Beam의 전단 보강에 관한 실험적 연구', 한국콘크리트학회 봄 학술발표회 논문집, 9권 1호, 1997, pp.609-614
  7. Zhang, J. P., Strength of Cauked Concrete. Part I : Shear Strength of Conventional Reinforced Concrete Beams, Deep Beams, Corbels, and Prestressed Reinforced Concrete Beams without Shear Reinforcement, Technical University of Thnmark, Department of Structural Engineering, Report No.311, 1994
  8. Kim, D., Kim, W., and White, R. N., 'Arch Action in Reinforced Concrete Beams-A Rational Prediction of Shear Strength', ACI Structural Journal, Vol.96, No.4, 1999, pp.586-593
  9. Kim, W. and White, R. N., 'Shear-Critical Cracking in Slender Reinforced Concrete Beams', ACI Structural Journal, Vol.96, No.5, 1999, pp.757-765
  10. Chen, J. F. and Teng, J G., 'Shear Strengthened RC beams : FRP Debonding', Construction and Building Materials, Vol.17, 2003, pp.27-41
  11. Nielsen, M. P., 'Limit Analysis and Concrete Platicity-2nd Edition', CRC Press, 1999, pp.373-401
  12. Hoang, L. C. and Nielsen, M. P., 'Plasticity Approach to Shear Design', Cement and Concrete Composites, Vol.20, 1998, pp.437-453
  13. Nielsen, M. P. and Braestrup, M. W., 'Plastic Shear Strength of Reinforced Concrete Beams', Bygningsstalixke Meddelelser, Vol.46, No.3, 1975 pp.61-99
  14. ACI Committee 318, 'Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (318RM-05)', American Concrete Institute, Sep. 2005, pp.147-150

Cited by

  1. Combined Effects of Sustained Load and Temperature on Pull-off Strength and Creep Response between CFRP Sheet and Concrete Using Digital Image Processing vol.28, pp.5, 2016,