Assessing the Efficiency of CFRP Discrete Confinement Systems for Concrete Cylinders
Publication: Journal of Composites for Construction
Volume 12, Issue 2
Abstract
Concrete columns requiring strengthening intervention always contain a certain percentage of steel hoops. Applying strips of wet layup carbon fiber-reinforced polymer (CFRP) sheets inbetween the existent steel hoops might, therefore, be an appropriate confinement technique with both technical and economic advantages, when full wrapping of a concrete column is taken as a basis of comparison. To assess the effectiveness of this discrete confinement strategy, circular cross-sectional concrete elements confined by distinct arrangements of strips of CFRP sheet are submitted to a direct compression load up to the failure point. The influence of the width of the strip, distance between strips, number of CFRP layers per strip, CFRP stiffness, and concrete strength class on the increase of the load carrying capacity and ductility of concrete columns, is evaluated. An analytical model is developed to predict the compressive stress-strain relationship of concrete columns confined by discrete and continuous CFRP arrangements. The main results of the experimental program are presented and analyzed and used to assess the model performance.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writers of the present work wish to acknowledge the generous support provided by S&P Clever Reinforcement and MBT Bettor Portugal. The second writer is grateful for the financial support by PRODEP Action No. UNSPECIFIED5.3/N/199.014/01.
References
Berthet, J. F., Ferrier, E., and Hamelin, P. (2005). “Compressive behaviour of concrete externally confined by composite jackets.” Constr. Build. Mater., 19, 223–232.
Bonaldo, E., Barros, J. A. O., and Lourenço, P. J. B. (2005). “Bond characterization between concrete substrate and repairing SFRC using pull-off testing.” Int. J. Adhes. Adhes., 25, 463–474.
Comite Euro-International du Béton-Fedération International de la Préconstrainte (CEB-FIP). (1990). Model code, Thomas Telford, London.
European Standards for Metalic Materials II. (1996). “Metallic materials: Tensile testing. Part: 1.” EN 10002-1.
Ferreira, D. R. S. M., and Barros, J. A. O. (2004). “Discrete and full confinement of concrete elements with CFRP sheets.” Technical Rep. No. 04-DEC/E-29, Dep. Civil Eng. Univ. of Minho, Guimãres, Portugal, ⟨http://www.civil.uminho.pt/composites⟩ (in Portuguese).
Harajli, M. H., Hantouche, E., and Soudki, K. (2006). “Stress-strain model for fiber-reinforced polymer jacketed concrete columns.” ACI Struct. J., 105(5), 672–682.
International Organization for Standardization (ISO). (2003). “Non-conventional reinforcement of concrete-test methods—Part 2: Fiber reinforced polymer (FRP) sheets.” ISO TC 71/SC 6 N, Geneva, Switzerland.
Lam, L., and Teng, J. G. (2003). “Design-oriented stress-strain model for FRP-confined concrete.” Constr. Build. Mater., 17, 471–489.
Li, Y.-F., Lin, C. T., and Sung, Y. Y. (2003). “A constitutive model for concrete confined with carbon fiber reinforced plastics.” Mech. Mater., 35, 603–619.
Lin, H. J., and Liao, C. I. (2004). “Compressive strength of reinforced concrete column confined by composite material.” Compos. Struct., 65, 239–250.
Mander, J. B., Priestley, M. J. N., and Park, R. (1998). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 114(8), 1804–1825.
Mirmiran, A., and Shahawy, M. (1997). “Behavior of concrete columns confined by fiber composites.” J. Struct. Eng., 123(5), 583–590.
Pessiki, S., Harries, K. A., Kestner, J. T., Sause, R., and Ricles, J. M. (2001). “Axial behaviour of reinforced concrete columns confined with FRP jackets.” J. Compos. Constr., 5(4), 237–245.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Model of concrete confined by fiber composites.” J. Struct. Eng., 124(9), 1025–1031.
Spoelstra, M., R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr., 3(3), 143–150.
Toutanji, H. A. (1999). “Stress-strain characteristics of concrete columns externally confined with advanced fiber composites sheets.” ACI Mater. J., 96(3), 397–404.
Toutanji, H. A., and Deng, Y. (2002). “Strength and durability performance of concrete axially loaded members confined with AFRP composites sheets.” J. of Composites, 33(4), 255–261.
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
© 2008 ASCE.
History
Received: May 2, 2006
Accepted: Mar 6, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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.