Effective Bond Length of Carbon-Fiber-Reinforced Polymer Strips Bonded to Fatigued Steel Bridge I-Girders
Publication: Journal of Bridge Engineering
Volume 10, Issue 2
Abstract
After years in service, many steel girders have deteriorated to the point where fatigue cracks have initiated in the girders. In girders having cover plates that do not terminate in a compression region, a common type of crack initiates at the weld toe at the ends of the cover plate after being subjected to cyclic tensile loads due to traffic. The use of precured carbon-fiber-reinforced polymer (CFRP) laminates, adhered to the inside face of the girder tension flange, is one proposed method for repairing these cracked bridge girders. The main advantages of using CFRP laminates are their light weight and their durability, which result in ease of handling and maintenance. For the application of this rehabilitation method, it is important to determine the effective bond length for CFRP laminates adhered to the inside face of a cracked steel girder flange. Experimental tests using a new type of effective bond length test specimen were conducted in this research on several types of adhesives and precured CFRP laminates, in addition to several different bonding configurations. The minimum bond length required to achieve the maximum strength of the rehabilitation scheme for the materials investigated in this research was determined. The experimental results also indicated that an adhesive with relatively large ductility is required to redistribute the stresses successfully within the adhesive layer during increased loading. A simple analytical solution for the shear strain distribution in the adhesive layer was proposed for estimating the effective bond length, and the results were verified with computational analyses. Good agreement was found among the computational, analytical, and experimental results.
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Acknowledgments
Funding for this research was provided by the Minnesota Department of Transportation, the Center for Transportation Studies, and the University of Minnesota. Supercomputing Resources were provided by the Minnesota Supercomputer Institute. Materials tested in this research were donated by Sika Corp., Fyfe Co., and . The authors gratefully acknowledge the contributions to this research from Paul M. Bergson, Eray Baran, and Yuying Hu of the University of Minnesota.
References
Andrea, M. D., Grondin, G. Y., and Kulak, G. L. (2001). “Behavior and rehabilitation of distortion-induced fatigue cracks in bridge girders.” Structural Engineering Rep. No. 240, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, Alta., Canada.
Arduini, M., and Nanni, A. (1997). “Behavior of precracked RC beams strengthened with carbon FRP sheets.” J. Compos. Constr., 1(2), 63–70.
American Society for Testing and Materials (ASTM). (1995). “Standard testing method for tensile properties of polymer matrix composite materials,” D 3039, Philadelphia.
American Society for Testing and Materials (ASTM). (1997). “Standard testing method for tensile properties of plastics,” D 638, Philadelphia.
Bakis, C. E., et al. (2002). “Fiber-reinforced polymer composites for construction—state-of-the-art review.” J. Compos. Constr., 6(2), 73–87.
Chajes, M. J., Januszka, T. F., Mertz, D. R., Thomson, T. A., Jr., and Finch, W. W., Jr. (1995). “Shear strengthening of reinforced concrete beams using externally applied composite fabrics.” Am. Concr. Inst. Struct. J., 92(3), 295–303.
Chajes, M. J., Mertz, D. R., Thomson, T. A., Jr., and Farschman, C. A. (1994). “Durability of composite material reinforcement.” Infrastructure: New Materials and Methods of Repair, Proc. of the Materials Engineering Conf., No. 804, ASCE, New York, 598–605.
Dorn, L., and Liu, W. (1992). “The stress state and failure properties of adhesive-bonded plastic metal joint.” Int. J. Adhes. Adhes., 13(1), 21–31.
Edberg, W. M., Mertz, D. R., and Gillespie, J. W., Jr. (1996). “Rehabilitation of steel beams using composite materials.” Materials for the New Millennium, Proc. of the Materials Engineering Conf., Vol. 1, ASCE, New York, 502–508.
Finch, W. W., Jr., Chajes, M. J., Mertz, D. R., Kaliakin, V. N., and Faqiri, A. (1994). “Bridge rehabilitation using composite materials,” Infrastructure: New Materials and Methods of Repair. Proc. of the Materials Engineering Conf., No. 804, ASCE, New York, 1140–1147.
Fisher, J. W., Barthelemy, B. M., Mertz, D. R., and Edinger, J. A. (1980). “Fatigue behavior of full-scale welded bridge attachments.” Rep. No.227, National Cooperative Highway Research Program, Washington, D. C.
Fisher, J. W., Hausammann, H., Sullivan, M. D., and Pense, A. W. (1979). “Detection and repair of fatigued damage in welded highway bridges.” Rep. No. 206, National Cooperative Highway Research Program, Washington, D. C.
Garden, H. N., Quantrill, R. J., Hollaway, L. C., Thorne, A. M., and Parke, G. A. R. (1998). “An experimental study of the anchorage length of carbon fibre composite plates used to strengthen reinforced concrete beams.” Constr. Build. Mater., 12(4), 203–219.
Gillespie, J. W., Jr., Mertz, D. R., Edberg, William M., and Ammar, N. (1997). “Steel girder rehabilitation through adhesive bonding of composite materials.” Proc., Annual Technical Conf.—ANTEC, Vol. 1, Society of Plastics Engineers, Brookfield, Conn., 1171–1175.
Gillespie, J. W., Jr., Mertz, D. R., Edberg, W. M., Ammar, N., Kasai, K., and Hodgson, I. C. (1996a). “Rehabilitation of steel bridge girders through application of composite materials.” Technology Transfer in a Global Community, Int. SAMPE Technical Conf., Vol. 28, SAMPE, Covina, Calif., 1249–1257.
Gillespie, J. W., Jr., Mertz, D. R., Kasai, K., Edberg, W. M., Demitz, J. R., and Hodgson, I. (1996b). “Rehabilitation of steel bridge girders: large scale testing.” Proc. of the American Society for Composites, Technomic Publishing, Lancaster, Pa., 231–240.
Hassan, A. F., Bowman, M. D. (1996). “Fatigue crack repair of steel beams with tapered cover plate details.” J. Struct. Eng., 122(11), 1337–1346.
Hassan, T., and Rizkalla, S. (2002) “Flexural stengthening of prestressed bridge slabs with FRP systems.” PCI J., 47(1), 76–93.
McKeefry, J. A., and Shield, C. K. (1999). “Acoustic emission monitoring of fatigue cracks in steel bridge girders.” Rep. No. MN/RC-1999-36, Minnesota Dept. of Transportation, St. Paul, Minn.
Meier, U., and Kaiser, H. P. (1991). “Strengthening of structures with CFRP laminates.” Advanced composites materials in civil engineering structures, S. L. Iyer, ed., ASCE Specialty Conf., New York, 224–232.
Nanni, A., Boothby, T., Cetin, K. M., Shaw, B. A., and Bakis, C. (1997). “Environmental degradation of repaired concrete structure.” Non-Metallic (FRP) Reinforcement for Concrete Structures, Proc., 3rd. Int. Symp., Vol. 2, 155–162.
Nozaka, K., Shield, C. K., and Hajjar, J. F. (2003). “Repair and retrofit of steel bridge girders with carbon fiber strips.” Final Rep., Minnesota Dept. of Transportation, St. Paul, Minn.
Sahli, A. H., Albrecht, P., and Vannoy, D. W. (1984). “Fatigue strength of retrofitted cover plates.” J. Struct. Eng., 110(6), 1374–1388.
Sen, R., Liby, L., Mullins, G., and Spillett, K. (1996). “Strengthening steel composite beams with CFRP laminates.” Materials for the New Millennium, Proc., Materials Engineering Conf., Vol. 2, ASCE, New York, 1601–1607.
Tedesco, J. W., Stallings, M. J. M., El-Mihilmy, M., and McCauley, M. W. (1996). “Rehabilitation of a concrete bridge using FRP laminates.” Materials for the New Millennium, Proc., Materials Engineering Conf., Vol. 1, ASCE, New York, 631–637.
Tsai, M. Y., and Morton, J. (1994). “ An evaluation of analytical and numerical solutions to the single-lap joint.” Int. J. Solids Struct., 31(18), 2537–2563.
Vatovec, M., Kelley, P. L., Brainerd, M. L., and Kivela, J. B. (2002). “Post strengthening of steel members with CFRP.” Int. Symp. and Exhibition of the Society for the Advancement of Material and Process Engineering, Vol. 47, SAMPE, Long Beach, Calif., 941–954.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 10 • Issue 2 • March 2005
Pages: 195 - 205
Copyright
© 2004 ASCE.
History
Received: Jan 3, 2003
Accepted: Feb 12, 2004
Published online: Mar 1, 2005
Published in print: Mar 2005
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