Steel and Composite Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Ductility of carbon fiber-reinforced polymer (CFRP) strengthened reinforced concrete beams: Experimental investigation

  • Kim, Sang Hun (Department of Civil and Environmental Engineering, Syracuse University) ;
  • Aboutaha, Riyad S. (Department of Civil and Environmental Engineering, Syracuse University)
  • Received : 2003.10.08
  • Accepted : 2004.07.27
  • Published : 2004.10.25
⟨ Previous Next ⟩

Abstract

Strength of reinforced concrete beams can easily be increased by the use of externally bonded CFRP composites. However, the mode of failure of CFRP strengthened beam is usually brittle due to tension-shear failure in the concrete substrate or bond failure near the CFRP-Concrete interface. In order to improve the ductility of CFRP strengthened concrete beams, critical variables need to be investigated. This experimental and analytical research focused on a series of reinforced concrete beams strengthened with CFRP composites to enhance the flexural capacity and ductility. The main variables were the amount of CFRP composites, the amount of longitudinal and shear reinforcement, and the effect of CFRP end diagonal anchorage system. Sixteen full-scale beams were investigated. A new design guideline was proposed according to the effects of the above-mentioned variables. The experimental and analytical results were found to be in good agreement.

Keywords

References

  1. ACI Committee 318 (2002), Building Code Requirements for Structural Concrete (318-02) and Commentary (318R-02) American Concrete Institute, Farming Hills, Michigan, 1-391.
  2. ACI Committee 440 Report,"Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures", (Revised 24 May 2000). American Concrete Institute, Farming Hills, Michigan, 2000, 1-89.
  3. Arduini, M. and Nanni, A. (1994),"Parametric study of beams with externally bonded FRP reinforcement", ACI Struct. J., 94(5), Sept.-Oct., 493-501.
  4. Bencardino, F., Spadea, G. and Swamy, R. N. (2002),"Strength and ductility of reinforced concrete beams externally reinforced with carbon fiber fabric", ACI Struct. J., 99(2), March-April, 163-171.
  5. Blaschko, M., Niedermeier, R. and Zilch, K. (1998),"Bond failure modes of flexural members strengthened with FRP", Proc. of the Second Int. Conf. on Composites in Infrastructure, ICCI '98, Tucson, Arizona, USA, 15-17 Jan, 315-327.
  6. fib Task Group 9.3 FRP Reinforcement for Concrete Structure,"Externally bonded FRP reinforcement for RC structures", Technical Report (Europe), July 2001, 1-58.
  7. Matthys, S. and Taerwe, L. (2000),"Strengthening of concrete structures with externally bonded FRP reinforcement: Some design aspects", Proc. of the Third Int. Conf. on Advanced Composite Material in Bridges and Structures, ACMBS, 497-504.
  8. Neale, K. (2001), Strengthening Reinforced Concrete Structures with Externally Bonded Fiber Reinforced Polymers: Design Manual No. 4, ISIS Canada Corporation, Canada, 1.1-4.47.
  9. Ritchie, P.A., Thomas, D.A., Lu, Le-Wu, and Connelly, G.M. (1991),"External reinforcement of concrete beams using fiber reinforced plastics", ACI Struct. J., 88(4), July-August, 490-499.
  10. Sharif, A. and Baluch, M.H. (1994),"External FRP plates to strengthen reinforced concrete beams", Fiber Composite in Infrastructure - Proc. of the First Int. Conf. on Composites in Infrastructure ICCI'96 January, 814-828.
  11. Spadea, G., Bencardino, F., Swamy, R.N. and Mukhopadhyaya, P. (2000),"Design against premature debonding and brittle behavior: The key to structural integrity with FRP bonded structural strengthening", Proc. of the Third Conf. on Advanced Composite Material in Bridges and Structures, ACMBS, 569-576.

Cited by

  1. A critical steel yielding length model for predicting intermediate crack-induced debonding in FRP -strengthened RC members vol.8, pp.6, 2008, https://doi.org/10.12989/scs.2008.8.6.457
  2. Experimental study on flexural performance of reinforced concrete beams subjected to different plate strengthening vol.176, 2017, https://doi.org/10.1016/j.compstruct.2017.05.052
  3. Iterative neural network strategy for static model identification of an FRP deck vol.9, pp.5, 2009, https://doi.org/10.12989/scs.2009.9.5.445
  4. Study on behavior of T-section modular composite profiled beams vol.10, pp.5, 2004, https://doi.org/10.12989/scs.2010.10.5.457
  5. Investigation on the flexural behavior of an innovative U-shaped steel-concrete composite beam vol.34, pp.3, 2004, https://doi.org/10.12989/scs.2020.34.3.441