Effects of FRP-Concrete Interface Bond Properties on the Performance of RC Beams Strengthened in Flexure with Externally Bonded FRP Sheets
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 5
Abstract
Fiber reinforced polymer (FRP) sheets have been increasingly used as externally bonded reinforcements in the rehabilitation of concrete structures. The efficacy of the FRP bonding technology highly depends on the bond integrity between the FRP sheets and the concrete. The bond performance may directly influence the cracking of the concrete, whereas the presence of concrete cracks would impair the bond between the FRP sheets and the concrete. This paper aims to clarify the effect of interface bond properties on the performance of FRP-strengthened reinforced concrete (RC) beams in terms of concrete cracking, interface stress transfer, and failure mechanisms using nonlinear fracture mechanics based finite element analyses. To represent the typical crack patterns and capture the local interaction between FRP debonding and concrete cracking, a specially designed structural model with uniformly distributed cracking is used within the frame of the discrete crack approach. A detailed parametric study is performed to investigate the effects of interface bond properties in terms of stiffness, strength, fracture energy (or toughness), and bond curve shape. It is concluded that bond fracture energy (or toughness) is the main parameter influencing the structural strength and ductility. This study may serve as a valuable reference for optimization of the FRP-concrete bond interface in practical applications.
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Acknowledgments
The partial financial supports from the National High Technology Research and Development Program of China (863 Program) under Grant No. 2001AA336010 and the Joint Research Fund for Overseas Chinese Young Scholars of National Natural Science Foundation of China (Grant No. NNSFC50228808) are gratefully acknowledged.
References
Bizindavyi, L., and Neale, K. W. (1999). “Transfer lengths and bond strengths for composites bonded to concrete.” J. Compos. Constr., 3(4), 153–160.
Chen, J. F., Yang, Z. J., and Holt, G. D. (2001). “FRP or steel plate-to-concrete bonded joints: Effect of test methods on experimental bond strength.” Steel Compos. Struct., 1(2), 231–244.
De Lorenzis, L., Miller, B., and Nanni, A. (2001). “Bond of FRP laminates to concrete.” ACI Mater. J., 98(3), 256–264.
Gao, B., Leung, W. H., Cheung, C. M., Kim, J.-K., and Leung, C. K. Y. (2001). “Effects of adhesive properties on strengthening of concrete beams with composite strips.” Proc., Int. Conf. on FRP Composites in Civil Engineering, Hong Kong, 423–432.
Hollaway, L. C., and Leming, M. B. (1999). Strengthening of reinforced concrete structures using externally-bonded FRP composites in structural and civil engineering, Woodhead Publishing Limited, Cambridge, U.K.
Japan Society of Civil Engineers. (1996). “JSCE standard specification for design and construction of concrete structures.” Tokyo.
Kamiharako, A., Shimomura, T., Maruyama, K., and Nishida, H. (1999). “Stress transfer and peeling-off behavior of continuous fiber reinforced sheet-concrete system.” Proc., 7th East Asia–Pacific Conf. on Structural Engineering and Construction, Kochi, Japan, 1283–1288.
Kishi, N., Mikami, H., and Zhang, G. (2003). “Numerical analysis of debonding behavior of FRP sheet for flexural strengthening RC beams.” JSCE Journal of Material, Concrete Structures and Pavements, 58(725), 255–272.
Maeda, T., Komaki, H., Tsubouchi, K., and Murakami, K. (2001). “Strengthening behavior of carbon fiber sheet using flexible layer.” Trans. Jpn. Concr. Inst., Sapporo, Japan, 23(1), 817–822.
Morita, S., Muguruma, H., and Tomita, K. (1967). “Fundamental study on bond between steel and concrete.” Transaction of the Architectural Institute of Japan, 131(1), 1–8.
Nakaba, K., Kanakubo, T., Furuta, T., and Yoshizawa, H. (2001). “Bond behavior between fiber-reinforced polymer laminates and concrete.” ACI Struct. J., 98(3), 359–367.
Niu, H. D., and Wu, Z. S. (2001). “Peeling-off criterion for FRP-strengthened R/C flexural members.” Proc. Int. Conf. on FRP Composites in Civil Engineering, Hong Kong, 571–578.
Täljsten, B. (1996). “Strengthening of concrete prisms using the plate-bonding technique.” Int. J. Fract., 82, 253–266.
TNO Building and Construction Research. (2002). DIANA-8 user’s manual, TNO DIANA BV, Delft, The Netherlands.
Ueda, T., and Dai, J. (2005). “Interface bond between FRP sheets and concrete substrates: Properties, numerical modeling and roles in member behavior.” Prog. Struct. Eng. Mater., 7(1), 27–43.
Ueda, T., Yamaguchi, R., Shoji, K., and Sato, Y. (2002). “Study on behavior in tension of reinforced concrete members strengthened by carbon fiber sheet.” J. Compos. Constr., 6(3), 168–174.
Wu, Z. S., and Kurokawa, T. (2002). “Strengthening effects and effective anchorage method for flexural members with externally bonded CFRP plates.” Japan Society of Civil Engineers, J. Materials, Concrete Structures and Pavements, 56(711), 1–13.
Wu, Z. S., Yin, J., Ishikawa, T., and Iizuka, M. (2002a). “Interfacial fracturing and debonding failure modes in FRP-strengthened concrete structures.” Proc. 4th Joint Canada-Japan Workshop on Composites, Vancouver, Canada, 403–410.
Wu, Z. S., Yuan, H., and Niu, H. D. (2002b). “Stress transfer and fracture propagation in different kinds of adhesive joints.” J. Eng. Mech., 128(5), 562–573.
Yang, Z. J., Chen, J. F., and Proverbs, D. (2003). “Finite element modelling of concrete cover separation failure in FRP plated RC beams.” Constr. Build. Mater., 17, 3–13.
Yoshizawa, H., Wu, Z. S., Yuan, H., and Kanakubo, T. (2000). “Study on FRP-concrete interface bond performance.” Japan Society of Civil Engineers, J. Material, Concrete Structures and Pavements, 49(662), 105–119.
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© 2006 ASCE.
History
Received: Oct 11, 2004
Accepted: Jan 9, 2006
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Laura De Lorenzis
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