Confinement Model for Concrete Columns Internally Confined with Carbon FRP Spirals and Hoops
Publication: Journal of Structural Engineering
Volume 141, Issue 9
Abstract
Recent years have seen valuable research work and widespread applications of fiber-reinforced polymer (FRP) bars as flexural and shear reinforcement for concrete structures. Nonetheless, the axial compression behavior of FRP reinforced concrete (RC) columns has not yet been defined. This study introduces equations and a confinement model to predict the stress-strain envelope responses of RC columns reinforced with carbon-FRP bars (CFRP) and confined by CFRP spirals or hoops. The model takes into account the effect of many parameters such as transverse reinforcement configuration, longitudinal reinforcement ratio, volumetric ratio, and the size and spacing of spirals or hoops. Results of analysis using the proposed confinement model were verified by means of a series of experiments with full-scale circular CFRP-RC columns. The proposed equations have been shown to predict accurately confined concrete core stress, corresponding concrete strain, and prepeak and postpeak stress-strain relationships for the tested CFRP-RC column specimens.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors would like to express their special thanks and gratitude to the Natural Science and Engineering Research Council of Canada (NSERC), the Fonds de recherche du Québec—Nature et Technologies—(FQRNT), the Canadian Foundation for Innovation (FCI), and the technical staff of the structural lab of the Department of Civil Engineering at the University of Sherbrooke.
References
American Concrete Institute (ACI). (2004). “Guide test methods for fiber-reinforced polymers (FRPs) for reinforcing or strengthening concrete structures.”, Farmington Hills, MI.
American Concrete Institute (ACI). (2006). “Guide for the design and construction of concrete reinforced with FRP bars.”, Farmington Hills, MI.
Alsayed, S. H., Al-Salloum, Y. A., Almusallam, T. H., and Amjad, M. A. (1999). “Concrete columns reinforced by GFRP rods.” Fourth Int. Symp. on Fiber-Reinforced Polymer Reinforcement for Reinforced Concrete Structures, SP-188, C. W. Dolan, S. H. Rizkalla, and A. Nanni, eds., American Concrete Institute, Farmington Hills, MI, 103–112.
Berthet, J. F., Ferrier, E., and Hamelin, P. (2006). “Compressive behavior of concrete externally confined by composite jackets—Part B: Modelling.” Constr. Build. Mater., 20(5), 338–347.
Bing, L., Park, R., and Tanaka, H. (2001). “Stress-strain behavior of high-strength concrete confined by ultra-high- and normal-strength transverse reinforcements.” ACI Struct. J., 98(3), 395–406.
Canadian Standards Association (CSA). (2012). “Design and construction of building components with fiber reinforced polymers.”, Mississauga, ON, Canada.
Cui, C., and Sheikh, S. A. (2010). “Experimental study of normal- and high-strength concrete confined with fiber-reinforced polymers.” J. Compos. Constr., 553–561.
Cusson, D., and Paultre, P. (1993). “Confinement model for high-strength concrete tied columns.”, Dept. of Civil Engineering, Univ. of Sherbrooke, Sherbrooke, QC, Canada.
De Luca, A., Matta, F., and Nanni, A. (2010). “Behavior of full-scale glass fiber-reinforced polymer reinforced concrete columns under axial load.” ACI Struct. J., 107(5), 589–596.
De Luca, A., Nardone, F., Matta, F., Nanni, A., Lignola, G. P., and Prota, A. (2011). “Structural evaluation of full-scale FRP-confined reinforced concrete columns.” J. Compos. Constr., 112–123.
Fafitis, A., and Shah, S. P. (1985). “Predictions of ultimate behavior of confined concrete columns subjected to large deformations.” ACI J. Proc., 82(4), 423–433.
Fardis, M. N., and Khalili, H. (1981). “Concrete encased in fiberglass-reinforced plastic.” ACI Struct. J., 78(6), 440–446.
Fardis, M. N., and Khalili, H. H. (1982). “FRP-encased concrete as a structural material.” Mag. Concr. Res., 34(121), 191–202.
Harajli, M. H. (2006). “Axial stress–strain relationship for FRP confined circular and rectangular concrete columns.” Cem. Concr. Compos., 28(10), 938–948.
Hognestad, E. (1951). A study on combined bending and axial load in reinforced concrete members, Univ. of Illinois Engineering Experiment Station, Univ. of Illinois at Urbana-Champaign, Urbana, IL, 43–46.
Issa, M. S., Metwally, I. M., and Elzeiny, S. M. (2011). “Structural performance of eccentrically loaded GFRP reinforced concrete columns.” Int. J. Civ. Struct. Eng., 2(1), 395–404.
Jiang, T., and Teng, J. G. (2007). “Analysis-oriented stress-strain models for FRP-confined concrete.” Eng. Struct., 29(11), 2968–2986.
Lam, L., and Teng, J. G. (2002). “Strength models for fiber-reinforced plastic-confined concrete.” J. Struct. Eng., 612–623.
Mander, J. B., Priestley, J. N., and Park, R. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 1804–1826.
Marques, S., Marques, D., Silva, J., and Cavalcante, M. (2004). “Model for analysis of short columns of concrete confined by fiber-reinforced polymer.” J. Compos. Constr., 332–340.
Mirmiran, A., and Shahawy, M. (1997). “Behavior of concrete columns confined by fiber composites.” J. Struct. Eng., 583–590.
Miyauchi, K., Inoue, S., Kuroda, T., and Kobayashi, A. (1999). “Strengthening effects of concrete columns with carbon fiber sheet.” Trans. Jpn Concr. Inst., 21, 143–150.
Mohamed, H., and Masmoudi, R. (2010). “Axial load capacity of reinforced concrete-filled FRP tubes columns: Experimental versus theoretical predictions.” J. Compos. Constr., 231–243.
Park, R., Priestly, M. J. N., and Gill, W. D. (1982). “Ductility of square confined concrete columns.” J. Struct. Div., 108(4), 929–950.
Pultrall. (2012). Composite reinforcing rods technical data sheet, Thetford Mines, QC, Canada.
Richart, F. E., Brandtzaeg, A., and Brown, R. L. (1928). “A study of the failure of concrete under combined compressive stresses.”, Engineering Experiment Station, Univ. of Illinois, Urbana, IL.
Saatcioglu, M., and Razvi, S. R. (1992). “Strength and ductility of confined concrete.” J. Struct. Div., 1590–1607.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Model of concrete confined by fiber composites.” J. Struct. Eng, 1025–1031.
Sheikh, S. A., and Uzmeri, S. M. (1980). “Strength and ductility of tied concrete columns.” J. Struct. Div., 106(5), 1079–1102.
Spoelstra, M. R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr., 143–150.
Teng, J. G., Huang, Y. L., Lam, L., and Ye, L. P. (2007). “Theoretical model for fiber reinforced polymer-confined concrete.” J. Compos. Constr., 201–210.
Tobbi, H., Farghaly, A. S., and Benmokrane, B. (2012). “Concrete columns reinforced longitudinally and transversally with glass fiber-reinforced polymers bars.” ACI Struct. J., 109(4), 551–558.
William, K. L., and Warnke, E. P. (1975). “Constitutive model for the triaxial behavior of concrete.” Proc., Int. Association for Bridge and Structural Engineering, Vol. 19, 1–30.
Xiao, Y., and Wu, H. (2000). “Compressive behavior of concrete confined by carbon fiber composite jackets.” J. Mater. Civ. Eng., 139–146.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 141 • Issue 9 • September 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 19, 2014
Accepted: Sep 25, 2014
Published online: Oct 16, 2014
Discussion open until: Mar 16, 2015
Published in print: Sep 1, 2015
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.