Theoretical Model for Fiber-Reinforced Polymer-Confined Concrete
Publication: Journal of Composites for Construction
Volume 11, Issue 2
Abstract
Fiber-reinforced polymer (FRP) composites have found increasingly wide applications in civil engineering due to their high strength-to-weight ratio and high corrosion resistance. One important application of FRP composites is as a confining material for concrete, particularly in the strengthening or seismic retrofit of existing reinforced concrete columns by the provision of a FRP jacket. FRP confinement can enhance both the compressive strength and the ultimate strain of concrete significantly. This paper presents a new stress–strain model for FRP-confined concrete in which the responses of the concrete core and the FRP jacket as well as their interaction are explicitly considered. Such a model is often referred to as an analysis-oriented model. The key novel feature of the proposed analysis-oriented model, compared to existing models of the same kind, is a more accurate and more widely applicable lateral strain equation based on a careful interpretation of the lateral deformation characteristics of unconfined, actively confined, and FRP-confined concrete. Through comparisons with independent test data, the proposed model is shown to be accurate not only for FRP-confined concrete but also for concrete confined with a steel tube, demonstrating the wide applicability of the model to concrete confined with different confining materials. The accuracy of the proposed model is also shown to be superior to existing analysis-oriented stress-strain models through comparisons with test data.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writers are grateful for the financial support received from the Research Grants Council of the Hong Kong SAR (Project No. PolyU 5064/01E), the Natural Science Foundation of China (National Key Project No. 50238030), and The Hong Kong Polytechnic University provided through its Area of Strategic Development (ASD) Scheme for the ASD in Urban Hazard Mitigation.
References
Aire, C., Gettu, R., and Casas, J. R. (2001). “Study of the compressive behavior of concrete confined by fiber reinforced composites.” Proc., Int. Conf. on Composites in Constructions, Balkema, Lisse, The Netherlands, 239–243.
American Concrete Institute (ACI). (1999). “Building code requirements for structural concrete and Commentary.” ACI 318R-95 and ACI 318R-95, Fifth Printing, Farmington Hills, Mich.
Becque, J., Patnaik, A. K., and Rizkalla, S. H. (2003). “Analytical models for concrete confined with FRP tubes.” J. Compos. Constr., 7(1), 31–38.
Candappa, D. C., Sanjayan, J. G., and Setung, S. (2001). “Complete triaxial stress-strain curves of high-strength concrete.” J. Mater. Civ. Eng., 13(3), 209–215.
Carreira, D. J., and Chu, K.-H. (1985). “Stress-strain relationship for plain concrete in compression.” ACI J., 82(6), 797–804.
Chun, S. S., and Park, H. C. (2002). “Load carrying capacity and ductility of RC columns confined by carbon fiber reinforced polymer.” Proc., 3rd Int. Conf. on Composites in Infrastructure (CD-ROM).
European Committee for Standardization. (1991). “Eurocode 2: Design of concrete structures—Part 1: General rules and rules for buildings.” ENV 1992-1-1, Brussels, Belgium.
Fam, A. Z., and Rizkalla, S. H. (2001). “Confinement model for axially loaded concrete confined by circular fiber-reinforced polymer tubes.” ACI Struct. J., 98(4), 451–461.
Gerstle, K. H. (1981a). “Simple formulation of biaxial concrete behavior.” ACI J., 78(1), 62–68.
Gerstle, K. H. (1981b). “Simple formulation of triaxial concrete behavior.” ACI J., 78(5), 382–387.
Harmon, T. G., Ramakrishnan, S., and Wang, E. H. (1998). “Confined concrete subjected to uniaxial monotonic loading.” J. Eng. Mech., 124(12), 1303–1309.
Harries, K. A., and Kharel, G. (2002). “Behavior and modeling of concrete subject to variable confining pressure.” ACI Mater. J., 99(2), 180–189.
Karabinis, A. I., and Rousakis, T. C. (2002). “Concrete confined by FRP material: A plasticity approach.” Eng. Struct., 24(7), 923–932.
Lam, L., and Teng, J. G. (2002). “Strength models for fiber-reinforced plastic-confined concrete.” J. Struct. Eng., 128(5), 612–623.
Lam, L., and Teng, J. G. (2003). “Design-oriented stress-strain model for FRP-confined concrete.” Constr. Build. Mater., 17(6&7), 471–489.
Lam, L., and Teng, J. G. (2004). “Ultimate condition of FRP-confined concrete.” J. Compos. Constr., 8(6), 539–548.
Lam, L., Teng, J. G., Cheung, C. H., and Xiao, Y. (2006). “FRP-confined concrete under cyclic axial compression.” Cem. Concr. Compos., 28(10), 948–958.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 114(8), 1804–1826.
Mirmiran, A., and Shahawy. (1996). “A new concrete-filled hollow FRP composite column.” Composites, Part B, 27B(3-4), 263–268.
Popovics, S. (1973). “Numerical approach to the complete stress-strain relation for concrete.” Cem. Concr. Res., 3(5), 583–599.
Richart, F. E., Brandtzaeg, A., and Brown, R. L. (1928). “A study of the failure of concrete under combined compressive stresses.” Bulletin No. 185, Engineering Experiment Station, Univ. of Illinois, Urbana, Ill.
Richart, F. E., Brandtzaeg, A., and Brown, R. L. (1929). “The failure of plain and spirally reinforced concrete in compression.” Bulletin No. 190, Engineering Experiment Station, Univ. of Illinois, Urbana, Ill.
Sfer, D., Carol, I., Gettu, R., and Etse, G. (2002). “Study of the behavior of concrete under triaxial compression.” J. Eng. Mech., 128(2), 156–163.
Spoelstra, M. R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr., 3(3), 143–150.
Teng, J. G., Chen, J. F., Smith, S. T., and Lam, L. (2002). FRP-strengthened RC structures, Wiley, London.
Teng, J. G., Chen, J. F., Smith, S. T., and Lam, L. (2003). “Behaviour and strength of FRP-strengthened RC structures: A state-of-the-art review.” Proc. Inst. Civ. Eng., Struct. Build., 156(1), 51–62.
Teng, J. G., and Lam, L. (2004). “Behavior and modeling of fiber-reinforced polymer-confined concrete.” J. Struct. Eng., 130(11), 1713–1723.
van Mier, J. G. M. (1986). “Multiaxial strain-softening of concrete—Part 1: Fracture.” Mater. Struct., 19(111), 179–190.
William, K. J., and Warnke, E. P. (1975). “Constitutive model for the triaxial behaviour of concrete.” Proc., International Association for Bridge and Structural Engineering, 19, 1–30.
Xiao, Y. (2004). “Applications of FRP composites in concrete columns.” Adv. Struct. Eng., 7(4), 335–343.
Xiao, Y., Tomii, M., and Sakino, K. (1991). “Triaxial compressive behavior of confined concrete.” Journal of Concrete Research and Technology, Japan Concrete Institute, 2(1), 1–14 (in Japanese).
Xiao, Y., and Wu, H. (2000). “Compressive behavior of concrete confined by carbon fiber composite jackets.” J. Mater. Civ. Eng., 12(2), 139–146.
Information & Authors
Information
Published In
Copyright
© 2007 ASCE.
History
Received: Jun 15, 2005
Accepted: May 26, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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.