Circular Columns Confined with FRP: Experimental versus Predictions of Models and Guidelines
Publication: Journal of Composites for Construction
Volume 10, Issue 1
Abstract
This paper presents results of an experimental investigation on half-scale concrete columns retrofitted with externally bonded fiber reinforced polymers (FRP). It then reviews six selected confinement models and three North American design guidelines for circular columns retrofitted with FRP and provides an in-depth comparison between experimental test results, models predictions, and values obtained using the guidelines. The comparison, which is carried out in terms of the confined to unconfined strengths, but also in terms of the gain in the load carrying capacity, considers the following parameters: The FRP confinement ratio, the unconfined concrete strength, and the elastic and mechanical properties of FRP. The results of this investigation indicated that for columns made of lower strength concrete, existing models and guidelines overestimate the confined concrete strength, and hence, the load carrying capacity of the columns.
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Acknowledgment
The financial support provided by the Natural Science and Engineering Council of Canada (NSERC) is gratefully acknowledged.
References
ACI-440 Committee. (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440, Detroit.
Canadian Standard Association (CSA). (2002). “Design and construction of building components with fibre-reinforced polymers.” CSA-S806-02, CSA Rexdale BD, Toronto.
De Lorenzis, L., and Tepfers, R. (2003). “Comparative study of models on confinement of concrete cylinders with fiber-reinforced polymer composites.” J. Compos. Constr., 7(3), 219–237.
Fardis, M. N., and Khalili, H. H. (1982). “FRP-encased concrete as a structural material.” Mag. Concrete Res., 34(121), 191–202.
Intelligent Sensing for Innovative Structures (ISIS). (2001). “Externally bonded FRP for strengthening reinforced concrete structures.” The Canadian Network of Centres of Excellence on ISIS, ISIS M04, Winnipeg, Manitoba, Canada.
Kono, S., Inazumi, M., and Kaku, T. (1998). “Evaluation of confining effects of CFRP sheets on reinforced concrete members.” Proc., 2nd Int. Conf. on Composites in Infrastructure, ICCI’98, Ehsani and Saadatmanesh, Tucson, Ariz., 343–355.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988). “Theoreticalstress-strain model for confined concrete.” J. Struct. Eng., 114(8), 1804–1826.
Miyaushi, K., Nishibayashi, S., and Inoue, S. (1997). “Estimation of strengthening effects with carbon fiber sheet for concrete column.” Proc., 3rd Int. Symp. on Non Metallic (FRP) Reinforcement for Concrete Structures, Japan Concrete Institute, Sapporo, Japan, Vol. 1, 217–232.
Monti, G., and Spoelstra, M. R. (1997). “Fiber-section analysis of RC bridge piers retrofitted with FRP jackets.” Proc., Structures Congress XV, ASCE, Reston, Va., 884–888.
Saafi, M., Toutanji, H. A., and Zongjin, L. (1999). “Behavior of concrete columns confined with fiber reinforced polymer tubes.” ACI Mater. J., 96(4), 500–509.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Model of concrete confined by fiber composites.” J. Struct. Eng., 124(9), 1025–1031.
Seible, F., Preistley, N., Hegemier, G. A., and Innamorato, D. (1997). “Seismic retrofit of RC columns with continuous carbon fiber jackets.” J. Compos. Constr., 1(2), 52–62.
Spoelstra, M. R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr., 3(3), 143–150.
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© 2006 ASCE.
History
Received: Feb 22, 2005
Accepted: May 13, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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