Skip to main content
SpringerLink
Log in

Experimental investigations and verification of debonding strain of RHSC continuous beams strengthened in flexure with externally bonded FRPs

  • Original Article
  • Published:
Materials and Structures Aims and scope Submit manuscript

Abstract

Although many in-situ RC beams are of continuous constructions, there has been very little research on the behavior of such beams with external reinforcement. This article presents an experimental program conducted to study the flexural behavior and redistribution of moment of reinforced high strength concrete (RHSC) continuous beams strengthened with carbon and glass-fiber-reinforced polymer (CFRP and GFRP) sheets. The program consists of six RHSC continuous (two-span) beams with overall dimensions equal to 250 × 150 × 6000 mm. One beam was not strengthened and was tested as a control beam. Five beams were strengthened with CFRP and GFRP in flexure along their sagging and hogging regions. The main parameters including type of FRP (GFRP or CFRP), the different ratios of CFRP sheet and effectiveness of end anchorage. The test results showed that the use of GFRP sheet in strengthening of continuous beam reduced loss in ductility and moment redistribution but it did not significantly increase the ultimate strength of them. The use of end anchorage in strengthened continuous beams increased the ultimate strength and moment redistribution. The moment enhancement ratio of the strengthened continuous beams was significantly higher than the ultimate load enhancement ratio in the same beam. Also existing international codes and model such as ACI, fib, JSCE, Teng and Toutanji for prediction of IC debonding strain or stress of strengthened continuous beams are verified. Verifications were carried out based on the test results in this research and the published literature on RC continuous beams strengthened with FRP.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Fig. 15

Similar content being viewed by others

References

  1. Foret G, Limam O (2008) Experimental and numerical analysis of RC two-way slabs strengthened with NSM CFRP rods. Constr Build Mater 22:2025–2030

    Article  Google Scholar 

  2. Lignola GP, Prota A, Manfredi G, Cosenza E (2007) Experimental performance of RC hollow columns confined with CFRP. J Compos Constr ASCE 11(1):42–49

    Article  Google Scholar 

  3. Teng JG, Chen JF, Smith ST, Lam L (2002) FRP strengthened RC structures. Wiley, New York

    Google Scholar 

  4. Xiong GJ, Yang JZ, Ji ZB (2004) Behavior of reinforced concrete beams strengthened with externally bonded hybrid carbon fiber–glass fiber sheets. J Compos Constr ASCE May/June:275–278

  5. Arduini M, Nanni A (1997) Behaviour of precracked RC beams strengthened with carbon FRP sheets. J Compos Constr ASCE 1(2):63–70

    Article  Google Scholar 

  6. Bencardino F, Spadea G, Swamy N (2002) Strength and ductility of reinforced concrete beams externally reinforced with carbon fiber fabric. ACI Struct J 99(2):163–171

    Google Scholar 

  7. Bogas JA, Gomes A (2008) Analysis of the CFRP flexural strengthening reinforcement approaches proposed in Fib bulletin 14. Constr Build Mater 22:2130–2140

    Article  Google Scholar 

  8. Camata G, Spacone E, Zarnic R (2007) Experimental and nonlinear finite element studies of RC beams strengthened with FRP plates. Composites 38:277–288

    Article  Google Scholar 

  9. Grace NF, Sayed GA, Soliman AK, Saleh KR (1999) Strengthening reinforcedconcrete beams using fiber reinforced polymer (FRP) laminates. ACI Struct J 96(5):865–874

    Google Scholar 

  10. Li L, Guo Y, Liu F (2008) Test analysis for FRC beams strengthened with externally bonded FRP sheets. Constr Build Mater 22:315–323

    Article  Google Scholar 

  11. Saadatmanesh H, Ehsani M (1991) RC beams strengthened with GFRP plates. I: Experimental study. J Struct Eng ASCE 117(11):3417–3433

    Article  Google Scholar 

  12. Thomsen H, Spacone E, Limkatanyu S, Camata G (2004) Failure mode analyses of reinforced concrete beams strengthened in flexure with externally bonded fiber-reinforced polymers. J Compos Constr ASCE March/April:123–131

  13. Toutanji H, Zhao L, Zhang Y (2006) Flexural behavior of reinforced concrete beams externally strengthened with CFRP sheets bonded with an inorganic matrix. Eng Struct 28:557–566

    Article  Google Scholar 

  14. Bank LC, Arora D (2006) Analysis of RC beams strengthened with mechanically fastened FRP (MF-FRP) strips. Compos Struct 79:180–191

    Article  Google Scholar 

  15. Chahrour A, Soudki K (2005) Flexural response of reinforced concrete beams strengthened with end-anchored partially bonded carbon fiber-reinforced polymer strips. J Compos Constr ASCE 9(2):170–177

    Article  Google Scholar 

  16. Garden HN, Hollaway LC (1998) An experimental study of the influence of plate end anchorage of carbon fibre composite plates used to strengthen reinforced concrete beams. Compos Struct 42:175–188

    Article  Google Scholar 

  17. Xiong GJ, Jiang X, Liu JW, Chen L (2007) A way for preventing tension delamination of concrete cover in midspan of FRP strengthened beams. Constr Build Mater 21:402–408

    Article  Google Scholar 

  18. Pham H, Al-Mahaidi R (2006) Prediction models for debonding failure loads of carbon fiber reinforced polymer retrofitted reinforced concrete beams. J Compos Constr ASCE 10(1):48–59

    Article  Google Scholar 

  19. Aiello MA, Valente L, Rizzo A (2007) Moment redistribution in continuous reinforced concrete beams strengthened with carbon-fiber-reinforced polymer laminates. Mech Compos Mater 43(5):453–466

    Article  Google Scholar 

  20. Ashour AF, El-Refaie SA, Garrity SW (2004) Flexural strengthening of RC continuous beams using CFRP laminates. Cem Concr Compos 26:765–775

    Google Scholar 

  21. El-Refaie SA, Ashour AF, Garrity SW (2003) Sagging and hogging strengthening of continuous reinforced concrete beams using carbon fiber-reinforced polymer sheets. ACI Struct J 100(4):446–453

    Google Scholar 

  22. Grace NF, Ragheb WF, Abdel-Sayed G (2004) Strengthening of cantilever and continuous beams using new triaxially braided ductile fabric. ACI Struct J 101(2):237–244

    Google Scholar 

  23. Liu IST, Oehlers DJ, Seracino R (2006) Moment redistribution in FRP and steel-plated reinforced concrete beams. J Compos Constr ASCE 10(2):115–124

    Article  MATH  Google Scholar 

  24. ACI (2008) Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. American Concrete Institute, ACI 440.2R-08, Farmington Hills

  25. FIB (2001) Externally bonded FRP reinforcement for RC structures. Fe′de′ration Internacionale du be′ton, Task Group 9.3 FRP

  26. JSCE (2001) Recommendations for the upgrading of concrete structures with use of continuous fiber sheets. Japanese Society of Civil Engineers, Concrete Engineering, Series 41, Tokyo

  27. ACI (1992) State-of-the-art report on high-strength concrete. American Concrete Institute, ACI 363R, Detroit

  28. Rashid MA, Mansur MA, Paramasivam P (2002) Correlations between mechanical properties of high-strength concrete. J Mater Civil Eng 14(3):230–238

    Article  Google Scholar 

  29. Oztekin E, Pul S, Husem M (2003) Determination of rectangular stress block parameters for high performance concrete. Eng Struct 25:371–376

    Article  Google Scholar 

  30. ACI (2008) Building code requirements for reinforced concrete. American Concrete Institute, ACI 318, Farmington Hills

  31. Hashemi H, Maghsoudi AA, Rahgozar R (2008) Flexural ductility of reinforced HSC beams strengthened with CFRP sheets. Struct Eng Mech Int J 30(4)

  32. Maghsoudi AA, Akbarzadeh H (2006) Flexural ductility of HSC members. Struct Eng Mech 24(2):195–213

    Google Scholar 

  33. Toutanji H, Zhao L, Anselm E (2006) Verifications of design equations of beams externally strengthened with frp composites. J Compos Constr ASCE May/June:254–264

  34. Aram MR, Czaderski C, Motavalli M (2007) Debonding failure modes of flexural FRP-strengthened RC beams. Compos Part B: Eng 39(5):826–841

    Google Scholar 

  35. Teng JG, Smith ST, Yao J, Chen JF (2003) Intermediate crack-induced debonding in RC beams and slabs. Constr Build Mater 17:447–462

    Article  Google Scholar 

Download references

Acknowledgment

The authors gratefully acknowledge the support of the Iran National Science Foundation (INSF).

Author information

Authors and Affiliations

  1. Civil Engineering Department, Kerman University, Kerman, Iran

    H. Akbarzadeh Bengar & A. A. Maghsoudi

Authors
  1. H. Akbarzadeh Bengar
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. A. Maghsoudi
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to A. A. Maghsoudi.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Akbarzadeh Bengar, H., Maghsoudi, A.A. Experimental investigations and verification of debonding strain of RHSC continuous beams strengthened in flexure with externally bonded FRPs. Mater Struct 43, 815–837 (2010). https://doi.org/10.1617/s11527-009-9550-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1617/s11527-009-9550-7

Keywords

Search

Navigation