Materials and Structures

, Volume 49, Issue 3, pp 1001–1011 | Cite as

Compressive behavior of concrete confined by CFRP and transverse spiral reinforcement. Part A: experimental study

  • Peng YinEmail author
  • Liang Huang
  • Libo Yan
  • Deju Zhu
Original Article


This study presents the results of an experimental investigation of 18 short concrete columns confined by carbon fiber-reinforced polymer (CFRP) and transverse spiral reinforcement (TSR) under uniaxial compression. Longitudinal rebars are not installed in the specimens in order to eliminate their confinement effect to concrete which affects the analysis of 3-D compression of concrete. The paper only consider for FRP and spiral reinforcement confinement in transverse direction. Two key experimental parameters were investigated: the thickness of the CFRP tube (0.167, 0.334, and 0.501 mm) and the spacing of the TSR (25 and 50 mm). The failure mode, axial and transverse stress–strain relationship, confinement effectiveness, Poisson’s ratio and dilatation performance of the specimens were discussed. Test results show that the ultimate strength of concrete has a linear proportional enhancement with an increase in the FRP layer in each TSR category and a decrease in the TSR spacing in each FRP layer category. The ultimate load carrying capacity of the confined concrete depends on the confinement pressure during failure in terms of ultimate strength and axial strain.


CFRP Transverse spiral reinforcement Longitudinal rebar Experimental study 



This research was funded by the Natural Science of China (project codes: 51078132) and China 973 Plan (Project codes: SQ2011CB076458). The experimental work were supported by the Structure Laboratory of Hunan University. The authors also acknowledge the technical instruction and assistance of Professor Yan Xiao and Professor Giorgio Monti.


  1. 1.
    Harries KA, Carey S (2003) Shape and ‘gap’ effects on the behavior of variably confined concrete. Cem Concr Res 3(6):881–890CrossRefGoogle Scholar
  2. 2.
    Lam L, Teng JG (2003) Design-oriented stress–strain model for FRP-confined concrete. Constr Build Mater 17(6–7):471–489CrossRefGoogle Scholar
  3. 3.
    Lignola GP, Nardone F, Prota A, Manfredi G (2012) Analytical model for the effective strain in FRP-wrapped circular RC columns. ELSEVIER Compos Part B 43(8):3208–3218CrossRefGoogle Scholar
  4. 4.
    Saafi M, Toutanji HA, Li Z (1999) Behavior of concrete columns confined with fiber reinforced polymer tubes. ACI Mater J 96(4):500–509Google Scholar
  5. 5.
    Samaan M, Mirmiran A, Shahawy M (1998) Model of concrete confined by fiber composites. J Struct Eng 124(9):1025–1031CrossRefGoogle Scholar
  6. 6.
    Ozbakkaloglu T, Lim JC, Vincent T (2013) FRP-confined concrete in circular sections: Review and assessment of stress–strain models. Eng Struct 49:1068–1088CrossRefGoogle Scholar
  7. 7.
    Toutanji HA (1999) Stress–strain characteristics of concrete columns externally confined with advanced fiber composite sheets. ACI Mater J 93(6):397–404Google Scholar
  8. 8.
    Xiao Y, Wu H (2000) Compressive behavior of concrete confined by carbon fiber composite jackets. J Mater Civ Eng 12(2):139–146CrossRefGoogle Scholar
  9. 9.
    Dai JG, Bai YL, Teng JG (2011) Behavior and modeling of concrete confined with FRP composite of large deformability. J Compos Constr 15(6):963–973CrossRefGoogle Scholar
  10. 10.
    American Concrete Institude (ACI) (2008a) Guide for the design and construction of external bonded FRP systems for strengthing concrete structure. ACI 440.2R-08. Farmington Hills, MichGoogle Scholar
  11. 11.
    Carey SA, Harries KA (2005) Axial behavior and modeling of confined small-, medium-, and large-scale circular sections with carbon fiber-reinforced polymer jackets. ACI Struct J 102(4):596–604Google Scholar
  12. 12.
    Eid R, Roy N, Paultre P (2009) Normal-and high-strength concrete circular elements wrapped with FRP composites. J Compos Constr 13(2):113–124CrossRefGoogle Scholar
  13. 13.
    Matthys S, Toutanji H, Audenaert K, Taerwe L (2005) Axial load behavior of large-scale columns confined with fiber-reinforced polymer composites. ACI Struct J 102(2):258–267Google Scholar
  14. 14.
    Eid R, Paultre P (2008) Analytical model for FRP-confined circular reinforced-concrete columns. J Compos Constr 12(5):541–552CrossRefGoogle Scholar
  15. 15.
    Lignola GP, Prota A, Manfredi G (2014) Simplified modeling of rectangular concrete cross-sections confined by external FRP wrapping. Polymers 6(4):1187–1206CrossRefGoogle Scholar
  16. 16.
    Pellegrino C, Modena C (2010) Analytical model for FRP confinement of concrete columns with and without internal steel reinforcement. J Compos Constr 14(6):693–705CrossRefGoogle Scholar
  17. 17.
    Pessiki S, Pieroni A (1997) Axial load behavior of large-scale spirally-reinforced high-strength concrete columns. ACI Struct J 94(3):304–313Google Scholar
  18. 18.
    De Lorenzis L, Tepfers R (2001) Comparative study of models on confinement of concrete cylinders with fiber reinforced polymer composites. ASCE J Compos Constr 5(4):237–245CrossRefGoogle Scholar
  19. 19.
    Karbhari VM, Gao Y (1997) Composite jacketed concrete under uniaxial compression-verification of simple design equations. J Mater Civ Eng 9(4):185–193CrossRefGoogle Scholar
  20. 20.
    Luca AD, Matta F, Nanni A (2011) Behavior of full-scale glass fiber-reinforced polymer reinforced concrete columns under axial load. ACI Struct J 107(5):589–596Google Scholar
  21. 21.
    Matthys S, Taerwe L, Audenaert K (1999) Test on axially loaded concrete columns confined by fiber reinforced polymers sheet wrapping. In Proceedings of FRPRCS-4, Baltimore, pp 217–218Google Scholar
  22. 22.
    Zinno A, Lignola GP, Prota A, Manfredi G, Cosenza E (2010) Influence of free edge stress concentration on effectiveness of FRP confinement. ELSEVIER Compos Part B 41(7):523–532CrossRefGoogle Scholar

Copyright information

© RILEM 2015

Authors and Affiliations

  1. 1.Department of Civil EngineeringHunan UniversityChangshaChina
  2. 2.Department of Construction & Structural EngineeringFraunhofer Wilhelm-Klauditz InstitutionBrunswickGermany

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