Slip Modulus of FRP Sheets Bonded to Concrete
Publication: Journal of Composites for Construction
Volume 3, Issue 4
Abstract
An analytical tension-stiffening model was developed for fiber-reinforced polymer (FRP) sheets bonded to reinforced concrete based on equilibrium equations and the assumption of linear behavior between bond stress and slip. Experimental measurements were made on small- and large-scale specimens. For the small-scale specimens, the primer coat thickness (adhesive thickness between concrete and FRP sheet) was varied for each specimen. By comparisons of the experimental data to the analytical results, the slip modulus at the concrete/FRP sheet and concrete/steel interface was established at the service load level. From this study, it was found that primer coat thickness has a modest influence on the slip modulus of the repaired member, and stiffening of this interface slightly enhances the stiffness of the specimen. After the formation of secondary and diagonal tension cracks, the stiffness of the specimen dropped rapidly and the linearly elastic slip modulus assumption could not be applied. The slip modulus at the concrete/steel rebar interface is less than at the concrete/FRP sheet interface and the slip modulus is independent of the type of FRP sheet.
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References
1.
Bakis, C. E., Tripi, J. M., Nanni, A., Engel, R. S., and Boothby, T. E. (1997). “Measurement of local deformations in fiber reinforced plastic reinforcement for concrete structures.” Proc., Spring Conf. on Experimental Mech., Society for Experimental Mechanics, Bethel, Conn., 175–184.
2.
Cosenza, E., Manfredi, G., and Realfonzo, R. (1997). “Behavior and modeling of bond of FRP rebars to concrete.”J. Compos. for Constr., ASCE, 1(2), 40–51.
3.
Creazza, G., Di Marco, R., Russo, S., and Siviero, E. (1996). “Tension-stiffening in high strength concrete.” Proc., 4th Int. Symp. on Utilization of High-Strength/High-Performance Concrete, Paris.
4.
Forca tow sheet technical notes. (1997). Tonen Corporation, Tokyo, Japan.
5.
Frigo, E. M. ( 1996). “The mechanics of externally bonded FRP for the repair of reinforced concrete,” MS thesis, The Pennsylvania State University, University Park, Pa.
6.
Gupta, A. K., and Maestrini, S. R. (1990). “Tension-stiffness model for reinforced concrete bars.”J. Struct. Engrg., ASCE, 116(3), 769–790.
7.
Kankam, C. E. (1997). “Relationship of bond stress, steel stress, and slip in reinforced concrete.”J. Struct. Engrg., ASCE, 123(1), 79–85.
8.
Lee, Y. J., Tripi, J. M., Boothby, T. E., Bakis, C. E., and Nanni, A. (1998). “Tension stiffening model for FRP sheets bonded to concrete.” Proc., 2nd Int. Conf. on Compos. in Infrastruct., University of Arizona, Tucson, Ariz., 1, 175–186.
9.
Lee, Y. J. ( 1998). “Tension-stiffening of CFRP sheets bonded to concrete,” MS thesis, The Pennsylvania State University, University Park, Pa.
10.
Nanni, A., Bakis, C. E., and Boothby, T. E. (1997). “Externally bonded FRP composites for repair of RC structures.” Non-Metallic (FRP) Reinforcement for Concrete Struct.: Proc., 3rd Int. Symp., E & FN Spon, London, 1, 303–310.
11.
Tripi, J. M., Bakis, C. E., Boothby, T. E., and Nanni, A. (1999). “Local deformations in damaged concrete reinforced with external CFRP sheets.”J. Compos. for Constr., ASCE, in press.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 3 • Issue 4 • November 1999
Pages: 161 - 167
History
Received: Oct 29, 1998
Published online: Nov 1, 1999
Published in print: Nov 1999
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