Behavior of CFRP Laminates Bonded to a Steel Substrate Using a Ductile Adhesive
Publication: Journal of Composites for Construction
Volume 18, Issue 2
Abstract
Strengthening of steel structures with adhesively bonded carbon fiber–reinforced polymer (CFRP) laminates (or plates) has received extensive research attention over the past few years. Existing studies have revealed that debonding of CFRP plates from a steel substrate is one of the main failure modes in such CFRP-strengthened steel structures. To better understand and model debonding failures, the behavior of CFRP-to-steel bonded joints needs to be well understood. Recent tests conducted by the authors’ have demonstrated that the bond strength of such bonded joints depends significantly on the properties of the adhesive used, and more specifically on the interfacial fracture energy rather than the tensile strength of the adhesive. The study has also showed that the bond-slip curves for nonlinear ductile adhesives have an approximately trapezoidal shape. This paper presents an analytical solution for the full-range behavior of CFRP-to-steel bonded joints with a ductile nonlinear adhesive. Predictions from the analytical solution are presented to explain the different stages of debonding failure and are compared with test data to demonstrate the validity of the analytical solution.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors are grateful for the financial support from The Hong Kong Polytechnic University provided through an international postgraduate scholarship for Ph.D. studies to the first author, from the National Basic Research Program (i.e., 973 Program) (project number: 2012CB026200), and through a postdoctoral fellowship to the second author.
References
Akbar, I., Oehlers, D. J., and Mohamed-Ali, M. S. (2010). “Derivation of the bond-slip characteristics for FRP plated steel members.” J. Constr. Steel Res., 66(8–9), 1047–1056.
Chen, J. F., and Teng, J. G. (2001). “Anchorage strength models for FRP and steel plates bonded to concrete.” J. Struct. Eng., 784–791.
Chen, J. F., Yuan, H., and Teng, J. G. (2007). “Debonding failure along a softening FRP-to-concrete interface between two adjacent cracks in concrete members.” Eng. Struct., 29(2), 259–270.
Dehghani, E., Daneshjoo, F., Aghakouchak, A. A., and Khaji, N. (2012). “A new bond-slip model for adhesive in CFRP-steel composite systems.” Eng. Struct., 34, 447–454.
De Lorenzis, L., Fernando, D., and Teng, J. G. (2013). “Coupled mixed-mode cohesive zone modeling of interfacial debonding in simply supported plated beams.” Int. J. Solids Struct., 50(14–15), 2477–2494.
Fawzia, S., Zhao, X. L., and Al-Mahaidi, R. (2010). “Bond-slip models for double strap joints strengthened by CFRP.” Compos. Struct., 92(9), 2137–2145.
Fernando, N. D. (2010). “Bond behaviour and debonding failures in CFRP-strengthened steel members.” Ph.D. thesis, Hong Kong Polytechnic Univ., Hong Kong.
Liu, H. B., Zhao, X. L., and Al-Mahaidi, R. (2010). “Effect of fatigue loading on bond strength between CFRP sheets and steel plates.” Int. J. Struct. Stab. Dyn., 10(1), 1–20.
Lu, X. Z., Teng, J. G., Ye, L. P., and Jiang, J. J. (2005). “Bond-slip models for FRP sheets/plates bonded to concrete.” Eng. Struct., 27(6), 920–937.
Taljsten, B. (1997). “Defining anchor lengths of steel and CFRP plates bonded to concrete.” Int. J. Adhes., 17(4), 319–327.
Teng, J. G., Chen, J. F., Smith, S. T., and Lam, L. (2002). FRP-strengthened RC structures, Wily, Chichester, U.K.
Teng, J. G., Fernando, D., Yu, T., and Zhao, X. L. (2010). “Treatment of steel surfaces for effective adhesive bonding.” Proc., 5th Int. Conf. on FRP Composites in Civil Engineering (CICE), CICE, Beijing, China.
Teng, J. G., Yu, T., and Fernando, D. (2012). “Strengthening of steel structures with fibre reinforced polymer composites.” J. Constr. Steel Res., 78, 131–143.
Teng, J. G., Yuan, H., and Chen, J. F. (2006). “FRP-to-concrete interfaces between two adjacent cracks: Theoretical model for debonding failure.” Int. J. Solids Struct., 43(18–19), 5750–5778.
Wu, Z. S., Yuan, H., and Niu, H. (2002). “Stress transfer and fracture propagation in different kinds of adhesive joints.” J. Eng. Mech., 562–573.
Xia, S. H., and Teng, J. G. (2005). “Behavior of FRP-to-steel bond joints.” Proc., Int. Symp. on Bond Behaviour of FRP in Structures (BBFS 2005), J. F. Chen and J. G. Teng, eds., International Institute for FRP in Construction, Hong Kong.
Yao, J., Teng, J. G., and Chen, J. F. (2005). “Experimental study on FRP-to-concrete bonded joints.” Compos., Part B, 36(2), 99–113.
Yu, T., Fernando, D., Teng, J. G., and Zhao, X. L. (2012). “Experimental study on CFRP-to-steel bonded interfaces.” Compos., Part B, 43(5), 2279–2289.
Yuan, H., Teng, J. G., Seracino, R., Wu, Z. S., and Yao, J. (2004). “Full-range behavior of FRP-to-concrete bonded joints.” Eng. Struct., 26(5), 553–565.
Zhao, X. L., and Zhang, L. (2007). “State-of-the-art review on FRP strengthened steel structures.” Eng. Struct., 29(8), 1808–1823.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 18 • Issue 2 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 27, 2013
Accepted: Sep 6, 2013
Published online: Nov 7, 2013
Published in print: Apr 1, 2014
Discussion open until: Apr 7, 2014
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.