Flexural Performance of Steel Girders Retrofitted Using CFRP Materials
Publication: Journal of Composites for Construction
Volume 16, Issue 3
Abstract
There are many existing deteriorated steel bridges that need to be retrofitted. This paper investigates the effectiveness of using carbon fiber-reinforced (CFRP) composite systems in retrofitting deteriorated steel beams. A total of 13 medium-scale steel I-beams with a span of 1.6 m was tested in a four-point bending setup. The tested beams were divided into four groups according to their studied parameter. Group 1 consists of four unretrofitted beams with different percentages of artificial deterioration to simulate corrosion in the bottom flange with the aim to investigate their behavior and to determine the residual flexural capacity. The other three groups have deteriorated steel beams that were retrofitted with different CFRP systems with the aim to evaluate the effectiveness of the proposed retrofit schemes. Four deteriorated beams were retrofitted with CFRP sheets bonded to the tension flange and were tested in Group 2. Group 3 consists of two deteriorated steel beams that were retrofitted with CFRP plates externally bonded to the bottom flange of the tested beams. Group 4 consists of three beams retrofitted using an unbonded CFRP sheet attached to two ductile anchorage systems at the beams’ ends. The study shows that steel beams retrofitted with external bonded CFRP systems experienced limited ductility upon the failure of the CFRP either by debonding or rupture at higher load capacities than that of the unretrofitted beams. The proposed anchorage system could increase the strength of the deteriorated beam, behave in a ductile manner, and eliminate the early peel off of the CFRP sheet.
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Acknowledgments
The authors wish to acknowledge the financial support provided from Canadian National Railway Company (CN) and the Natural Sciences and Engineering Research Council of Canada (NSERC) while carrying out this research work.
References
ASTM. (2007). “Standard test methods for tension testing of metallic materials [metric].” E8M-1, ASTM International, PA.
Buyukozturk, O., Gunes, O., and Karaca, E. (2004). “Progress on understanding debonding problems in reinforced concrete and steel members strengthened using FRP composites.” Constr. Build. Mater.CBUMEZ, 18(1), 9–19.
CSA. (2009). “Limit states design of steel structures.” S16-09, Canadian Standard Association, Rexdale, Ontario, Canada.
Dawood, M. (2005). “Fundamental behavior of steel-concrete composite beams strengthened with high modulus carbon fiber reinforced polymer materials.” Master’s thesis, NC State Univ., Raleigh, NC.
Fawzia, S., Al-Mahaidi, R., and Zhao, X. (2006). “Experimental and finite element analysis of a double strap joint between steel plates and normal modulus CFRP.” Compos. Struct.COMSE2, 75(1–4), 156–162.
Frauenberger, A., et al. (2003). “FRP repair and health monitoring of railroad steel bridges.” CIES Technical Report No. 03-44. Univ. of MO, Rolla.
Fyfe. (2009). “Tyfo SCH-11UP, UC, and EP-DB composites and Tyfo S and MB-3 epoxy user’s guide.” Fyfe Company LLC 〈http://www.fyfeco.com〉 (Jan. 2009).
Galal, K., and Mofidi, A. (2009). “Strengthening RC beams in flexure using new hybrid FRP sheet / ductile anchor system.” J. Compos. Constr.JCCOF2, 13(3), 217–225.
Gillespie, J. W. Jr., Mertz, D. R., Kasai, K., Edberg, W. M., Demitz, J. R., and Hodgson, I. (1996). “Rehabilitation of steel bridge girders: Large scale testing.” Proc. of the 11th Technical Conf. of the American Society for Composites, Technomic, Lancaster, PA, 231–240.
Gioncu, V., and Petcu, D. (1997a). “Available rotation capacity of wide-flange beams and beam-columns Part 1. Theoretical approaches.” J. Constr. Steel Res.JCSRDL, 43(1–3), 161–217.
Gioncu, V., and Petcu, D. (1997b). “Available rotation capacity of wide-flange beams and beam-columns Part 2. Experimental and numerical tests.” J. Constr. Steel Res.JCSRDL, 43(1–3), 219–244.
Hollaway, L. C., Zhang, L., Photiou, N. K., Teng, J. G., and Zhang, S. S. (2006). “Advances in adhesive joining of carbon fibre/polymer composites to steel members for repair and rehabilitation of bridge structures.” Adv. Struct. Eng., 9(6), 791–803.
Lindt, V. D., Ahlborn, T. M., and Kethu, S. (2005). “Alternate approach to approximating deteriorated steel beam end capacity.” Transp. Res. Rec. 1928, 92–100.
Liu, X., Silva, P. R., and Nanni, A. (2001). “Rehabilitation of steel bridge members with FRP composite materials.” Proc., CCC 2001, Composites in Construction, Porto, Portugal, 613–617.
Nozaka, K., Shield, C. K., and Hajjar, J. F. (2001). “Rehabilitation of fatigued steel girders with carbon fiber strips.” MN/RC Report No. 2004-02, Univ. of MN.
Patnaik, A., Bauer, C., and Srivatsan, T. (2008). “The extrinsic influence of carbon fibre reinforced plastic laminates to strengthen steel structures.” SadhanaSAPSER, 33(3), 261–272.
Photiou, N. K., Hollaway, L. C., and Chryssanthopoulos, M. K. (2006). “Strengthening of an artificially degraded steel beam utilising a carbon/glass composite system.” Constr. Build. Mater.CBUMEZ, 20(1–2), 11–21.
Rahgozar, R. (2009). “Remaining capacity assessment of corrosion damaged beams using minimum curves.” J. Constr. Steel Res.JCSRDL, 65(2), 299–307.
Stratford, T., and Cadei, J. (2006). “Elastic analysis of adhesion stresses for the design of a strengthening plate bonded to a beam.” Constr. Build. Mater.CBUMEZ, 20(1–2), 34–45.
West, T. D. (2001). “Enhancements to the bond between advanced composite materials and steel for bridge rehabilitation.” Master’s thesis, Univ. of DE, Newark, DE.
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Published In
Journal of Composites for Construction
Volume 16 • Issue 3 • June 2012
Pages: 265 - 276
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 16, 2011
Accepted: Oct 25, 2011
Published online: Oct 27, 2011
Published in print: Jun 1, 2012
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