Strengthening of Eccentrically Loaded Reinforced Concrete Columns with Fiber-Reinforced Polymer Wrapping System: Experimental Investigation and Analytical Modeling
Publication: Journal of Composites for Construction
Volume 13, Issue 1
Abstract
This paper presents the results of experimental program and analytical modeling for performance evaluation of a fiber-reinforced polymer (FRP) wrapping system to upgrade eccentrically loaded reinforced concrete (RC) columns. A total of 12 RC columns with end corbels were tested. The test specimen had an overall length of . Each end corbel had a cross section of and a length of . The specimen in the test region was having a longitudinal steel ratio of 1.9%. Test parameters included confinement condition (no wrapping, full FRP wrapping, and partial FRP wrapping), and eccentricity-to-section height ratio (0.3, 0.43, 0.57, and 0.86). Research findings indicated that the strength gain caused by FRP wrapping decreased as was increased. Full FRP wrapping resulted in about 37% enhancement in compression strength at a nominal of 0.3, whereas only 3% strength gain was recorded at a nominal of 0.86. The compression strengths of the partially wrapped columns were on average 5% lower than those of the fully wrapped columns. A nonlinear, second-order analysis that accounts for the change in eccentricity caused by the lateral deformation was proposed to predict the columns strength. A comparison between analytical and experimental results of the present study in addition to data published in the literature demonstrated the accuracy and validity of the proposed analysis.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writer would like to express appreciation to Research Affairs at the UAE University for the financial support of this project under fund Grant No. UNSPECIFIED02-01-7-11/06. The writer also expresses gratitude to the Undergraduate Research Assistants and Laboratory Specialists at the UAE University for their help throughout the testing.
References
American Concrete Institute (ACI). (2002). Building code requirements for structural concrete, ACI 318-02, Farmington Hills, Mich.
Chaallal, O., and Shahawy, M. (2000). “Performance of fiber-reinforced polymer-wrapped reinforced concrete columns under combined axial-flexural loading.” ACI Struct. J., 97(4), 659–669.
Chaallal, O., Shahawy, M., and Hassan, M. (2003). “Performance of axially loaded short rectangular columns strengthened with carbon fiber-reinforced polymer wrapping.” J. Compos. Constr., 7(3), 200–208.
Collins, M. P., and Mitchell, D. (1987). Prestressed concrete basics, Canadian Prestressed Concrete Institute (CPCI), Ottawa.
El Maaddawy, T. A., Soudki, K. A., and Topper, T. (2005). “Computer-based mathematical model for performance prediction of corroded beams repaired with fiber-reinforced polymers.” J. Compos. Constr., 9(3), 227–235.
El-Tawil, S., Ogunc, C., Okeil, A., and Shahawy, M. (2001). “Static and fatigue analysis of RC beams strengthened with CFRP laminates.” J. Compos. Constr., 5(4), 258–267.
Fam, A., Flisak, B., and Rizkalla, S. (2003). “Experimental and analytical modeling of concrete-filled fiber-reinforced polymer tubes subjected to combined bending and axial loads.” ACI Struct. J., 100(4), 499–509.
Fam, A., Schnerch, D., and Rizkalla, S. (2005). “Rectangular filament-wound glass fiber-reinforced polymer tubes filled with concrete under flexural and axial loading: Experimental investigation.” J. Compos. Constr., 9(1), 25–33.
Hognestad, E., Hanson, N., and McHenry, D. (1955). “Concrete stress distribution in ultimate strength design.” ACI J., 52(6), 455–479.
Mirmiran, A., Shahawy, M., El Khoury, C., and Naguib, W. (2000). “Large beam-column tests on concrete-filled composite tubes.” ACI Struct. J., 97(2), 268–276.
Mirmiran, A., Shahawy, M., and Samaan, M. (1999). “Strength and ductility of hybrid FRP-concrete beam-columns.” J. Struct. Eng., 125(10), 1085–1093.
Nanni, A., and Norris, M. S. (1995). “FRP jacketed concrete under flexure and combined flexure-compression.” Constr. Build. Mater., 9(5), 273–281.
Park, R., and Paulay, T. (1975). Reinforced concrete structures, Wiley, New York.
Parvin, A., and Wang, W. (2001). “Behavior of FRP jacketed concrete columns under eccentric loading.” J. Compos. Constr., 5(3), 146–152.
Pessiki, S., Harries, K., Kestner, J., Sause, R., and Ricles, J. (2001). “Axial behavior of reinforced concrete columns confined with FRP jackets.” J. Compos. Constr., 5(4), 237–245.
Saadatmanesh, H., Ehsani, M. R., and LI, M. W. (1994). “Strength and ductility of concrete columns externally reinforced with fiber composite straps.” ACI Struct. J., 91(4), 443–447.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Models of concrete confined by fiber composite.” J. Struct. Eng., 124(9), 1025–1031.
Sheikh, S., and Uzumeri, S. (1980). “Strength and ductility of tied concrete columns.” J. Struct. Div., 106(5), 1079–1102.
Tan, K. H. (2002). “Strength enhancement of rectangular reinforced concrete columns using fiber-reinforced polymer.” J. Compos. Constr., 6(3), 175–183.
Teng, J., Chen, J., Smith, S., and Lam, L. (2002). FRP-strengthened RC structures, Wiley, Chichester, U.K.
Wang, Y. C., and Restrepo, J. I. (2001). “Investigation of concentrically loaded reinforced concrete columns confined with glass fiber-reinforced polymer jackets.” ACI Struct. J., 98(3), 377–385.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 13 • Issue 1 • February 2009
Pages: 13 - 24
Copyright
© 2009 American Society of Civil Engineers.
History
Received: Oct 4, 2007
Accepted: Jan 24, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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.