Experimental Study on Bond Behavior between Concrete and FRP Reinforcement
Publication: Journal of Composites for Construction
Volume 12, Issue 2
Abstract
Bonding between fiber-reinforced polymer (FRP) sheets and concrete supports is essential in shear and flexural applications for transfer of stress between concrete structure and reinforcement. This paper aims at better understanding FRP–concrete bond behavior and at assessing some of the common formulations for effective bond length and bond–slip models by means of an extensive experimental program on 39 concrete specimens strengthened with various types and amounts of FRP strips and covering a wide range of FRP axial rigidities, subjected to both double-shear and bending tests. Effective bond length, maximum bond/shear stress, slip when bond stress peaks, and slip when bond stress falls to zero, were all experimentally measured. The influence of FRP stiffness on effective bond length and bond–slip behavior was observed. New expressions for (1) effective bond length; (2) maximum shear/bond stress; (3) slip at peak value of bond stress; and (4) slip at ultimate, taking into account the influence of FRP stiffness, are proposed.
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Acknowledgments
The writers wish to thank the Degussa Group (Treviso, Italy) for supplying fibers and the adhesion system, and for technical support. The writers are also grateful to G. Boschetto and G. Damo for their experimental work.
References
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-02, ACI, Farmington Hills, Mich.
Bizindavyi, L., and Neale, K. W. (1999). “Transfer lengths and bond strengths for composites bonded to concrete.” J. Compos. Constr., 3(4), 153–160.
Boschetto, G., Pellegrino, C., Tinazzi, D., and Modena, C. (2006). “Bond behavior between FRP sheets and concrete: An experimental study.” Proc., 2nd fib Congress, Naples, Italy.
Brosens, K., and Van Gemert, D. (1997). “Anchoring stresses between concrete and carbon fiber-reinforced laminates.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan Concrete Institute, Sapporo, Japan, 1, 271–278.
Chen, J. F., and Teng, J. G. (2001). “Anchorage strength models for FRP and steel plates bonded to concrete.” J. Struct. Eng., 127(7), 784–791.
Consiglio Nazionale delle Ricerche (CNR). (2004). “Guide for the design and construction of externally bonded FRP systems for strengthening existing structures: Materials, RC and PC structures, masonry structures.” CNR-DT 200/2004, Italian Research Council, Italian Advisory Committee on Technical Recommendations for Construction, CNR, Rome.
De Lorenzis, L., Miller, B., and Nanni, A. (2001). “Bond of fiber-reinforced polymer laminates to concrete.” ACI Mater. J., 98(3), 256–264.
Féderation International du Béton (fib). (2001). “Externally bonded FRP reinforcement for RC structures.” fib Bulletin 14, fib Task Group 9.3, fib, Lausanne, Switzerland.
Khalifa, A., Gold, W. J., Nanni, A., and Abdel Aziz, M. I. (1998). “Contribution of externally bonded FRP to shear capacity of RC flexural members.” J. Compos. Constr., 2(4), 195–202.
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, 920–937.
Maeda, T., Asano, Y., Sato, Y., Ueda, T., and Kakuta, Y. (1997). “A study on bond mechanism of carbon fiber sheet.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan Concrete Institute, Sapporo, Japan, 1, 279–285.
Miller, B., Nanni, A., and Bakis, C. (1999). “Analytical model for CFRP sheets bonded to concrete.” Proc., 8th Int. Structural Faults and Repair Conf., M. C. Forde, ed., Engineering Techniques, Edinburgh, Scotland, U.K.
Monti, M., Renzelli, M., and Luciani, P. (2003). “FRP adhesion in uncracked and cracked concrete zones.” Proc., 6th Int. Symp., on FRP Reinforcement for Concrete Structures, FRPRCS-6, World Scientific, Singapore, 183–192.
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.
Neubauer, U., and Rostasy, F. S. (1999). “Bond failure of concrete fiber-reinforced polymer plates at inclined cracks—Experiments and fracture mechanics model.” Proc., 4th Int. Symp. on Fiber-Reinforced Polymer Reinforcement for Reinforced Concrete Structures, SP-188, Americal Concrete Institute, Farmington Hills, Mich., 369–382.
Pellegrino, C., Boschetto, G., Tinazzi, D., and Modena, C. (2005). “Progress on understanding bond behavior in RC elements strengthened with FRP.” Proc., Int. Symp. on Bond Behavior of FRP in Structures, Hong Kong.
Pellegrino, C., and Modena, C. (2002). “FRP shear strengthening of RC beams with transverse steel reinforcement.” J. Compos. Constr., 6(2), 104–111.
Pellegrino, C., and Modena, C. (2006). “FRP shear strengthening of RC beams: Experimental study and analytical modeling.” ACI Struct. J., 103(5), 720–728.
Pellegrino, C., Tinazzi, D., and Modena, C. (2002). “About RC beams strengthened in shear with FRP sheets.” Proc., 1st fib Congress on Concrete Structures in the 21st Century, Osaka, Japan.
Savoia, M., Ferracuti, B., and Mazzotti, D. (2003). “Nonlinear bond–slip law for FRP-concrete interface.” Proc., 6th Int. Symp. on FRP Reinforcement for Concrete Structures, FRPRCS-6, World Scientific, Singapore, 163–172.
Taljsten, B. (1997). “Defining anchor lengths of steel and CFRP plates bonded to concrete.” Int. J. Adhes. Adhes., 17(4), 319–327.
Yao, J., Teng, J. G., and Chen, J. F. (2005). “Experimental study on FRP-to-concrete bonded joints.” Composites, Part B, 36, 99–113.
Yi, W.-H., Kang, D.-E., Woo, H.-S., Choi, K.-S., Yoo, Y.-C., and Keung-Hwan, K. (2006). “A study on bond mechanism of fiber-reinforced polymer bonded to concrete.” Proc., 2nd fib Congress, Naples, Italy.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 2 • April 2008
Pages: 180 - 189
Copyright
© 2008 ASCE.
History
Received: Oct 16, 2006
Accepted: Feb 27, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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