Flexural Response of Steel Beams Strengthened with Partial-Length CFRP Plates
Publication: Journal of Composites for Construction
Volume 9, Issue 4
Abstract
This paper presents the flexural behavior of rolled steel beams that were strengthened with partial-length, adhesive-bonded carbon fiber-reinforced polymer (CFRP) plates. The hybrid beams had two types of failure mode, depending on the length of the plate: (1) plate debonding in beams with short plates; and (2) plate rupture at midspan in beams with long plates. The flexural behavior that was investigated includes the development of tensile stresses in the plate, the moment-curvature of the strengthened section, and the load-deflection of the strengthened beam. The analytical methods used include shear lag analysis, section analysis, and application of the virtual work principle. Agreement between the experimental results and the analytical predictions is discussed.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writers gratefully acknowledge the Thailand Research Fund for providing financial support and Sika Thailand, Ltd., for providing composite materials and fabricating the test specimens. Also, the writers wish to thank Professor Eiichi Watanabe at Kyoto University for his suggestions.
References
Al-Saidy, A. H. (2001). “Structural behavior of composite steel beams strengthened/repaired with carbon fiber reinforced polymer plates.” PhD thesis, Iowa State University, Ames, Iowa.
American Association of State Highway and Transportation Officials (AASHTO). (1998). LRFD bridge design specifications, 2nd Ed., Washington, D.C.
Bogy, D. B. (1971). “Two edge-bonded elastic wedges of different materials and wedge angles under surface tractions.” J. Appl. Mech., 35, 377–386.
Dempsey, J. P., and Sinclair, G. B. (1981). “On the singular behavior at the vertex of a bi-material wedge.” J. Elast., 11(3), 317–327.
Lenwari, A. (2002). “Terminal distances for CFRP plates adhesively bonded to steel girders.” PhD thesis, Chulalongkorn University, Bangkok, Thailand.
Lenwari, A., Thepchatri, T., and Watanabe, E. (2002). “Prediction of premature separation of bonded CFRP plates from strengthened steel beams using a fracture criterion.” Struct. Eng. Mech., 14(5), 565–574.
Malek, A. M., Saadatmanesh, H., and Ehsani, M. R. (1998). “Prediction of failure load of R/C beams strengthened with FRP plate due to stress concentration at the plate end.” ACI Struct. J., 95(1), 142–152.
Miller, T. C., Chajes, M. J., Mertz, D. R., and Hastings, J. N. (2001). “Strengthening of a steel bridge girder using CFRP plates.” J. Bridge Eng., 6(6), 514–522.
Sen, R., Liby, L., Spillett, K., and Mullins, G. (1995). “Strengthening steel composite bridge members using CFRP laminates.” Non-metallic (FRP) reinforcement for concrete structures, L. Taerwe, ed., RILEM, London, 551–558.
Sen, R., Liby, L., and Mullins, G. (2001). “Strengthening steel bridge sections using CFRP laminates.” Composites, Part B, 32, 309–322.
Steel Structures Painting Council. (1991). “Surface preparation.” Systems and specification, 6th Ed., Pittsburgh.
Task Committee on Flexural Members. (1967). “Commentary on welded cover-plated beams.” J. Struct. Div. ASCE, 93(ST4), 95–122.
Tavakkolizadeh, M., and Saadatmanesh, H. (2003). “Strengthening of steel-concrete composite girders using carbon fiber reinforced polymers sheets.” J. Struct. Eng., 129(1), 30–40.
Volkersen, O. (1938). “Die Nietkraftverteilung in Zugbeanspruchten Nietverbindungen mit Konstanten Laschenquerschnitten.” Luftfahrtforschung, 15, 41–47 (in German).
William, M. L. (1952). “Stress singularities resulting from various boundary conditions in angular corners of plates in extension.” J. Appl. Mech., 19, 526–528.
Yang, Y. Y. (1998). “Asymptotic description of the logarithmic singular stress field and its application.” Int. J. Solids Struct., 35(30), 3917–3933.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 9 • Issue 4 • August 2005
Pages: 296 - 303
Copyright
© 2005 ASCE.
History
Received: Jun 17, 2004
Accepted: Sep 21, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
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.