Bond Behavior of Near-Surface Mounted CFRP Laminate Strips under Monotonic and Cyclic Loading
Publication: Journal of Composites for Construction
Volume 10, Issue 4
Abstract
Near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) laminate strips are used to increase the load-carrying capacity of concrete structures. This is done by inserting the CFRP strips into slits made in the concrete cover of the elements to be strengthened and gluing the strips to the concrete with an epoxy adhesive. In several cases the NSM technique has substantial advantages when compared with externally bonded laminates. To assess the bond behavior between the CFRP and concrete under monotonic and cyclic loading, an experimental program was carried out based on a series of pullout-bending tests. The influence of the bond length and loading history on the bond behavior was investigated. In this work the details of the tests are described and the obtained results discussed. Using the experimental data and an analytical-numerical strategy, a local bond stress-slip relationship was determined. A finite-element analysis was performed to evaluate the influence of the adhesive on the global response observed in the pullout-bending tests.
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Acknowledgments
The first writer wishes to acknowledge the grant SFRH/BD/3259/2000 provided by FCT (Portuguese Foundation for Science and Technology) and FSE (European Social Fund). The tests were performed at the Structural Technology Laboratory of the Technical University of Catalonia, Spain, with the help of Miguel Angel Martín and Ernesto Diaz. The writers wish to acknowledge the support provided by S&P and Bettor MBT, who supplied the material used in the study.
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© 2006 ASCE.
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Received: Jul 14, 2005
Accepted: Oct 6, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
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