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Polymers 2014, 6(3), 613-633; doi:10.3390/polym6030613
Article

RC Beams Strengthened with Mechanically Fastened Composites: Experimental Results and Numerical Modeling

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Received: 18 December 2013 / Revised: 17 February 2014 / Accepted: 19 February 2014 / Published: 5 March 2014
(This article belongs to the Special Issue Selected Papers from "SMAR 2013")
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Abstract

The use of mechanically-fastened fiber-reinforced polymer (MF-FRP) systems has recently emerged as a competitive solution for the flexural strengthening of reinforced concrete (RC) beams and slabs. An overview of the experimental research has proven the effectiveness and the potentiality of the MF-FRP technique which is particularly suitable for emergency repairs or when the speed of installation and immediacy of use are imperative. A finite-element (FE) model has been recently developed by the authors with the aim to simulate the behavior of RC beams strengthened in bending by MF-FRP laminates; such a model has also been validated by using a wide experimental database collected from the literature. By following the previous study, the FE model and the assembled database are considered herein with the aim of better exploring the influence of some specific aspects on the structural response of MF-FRP strengthened members, such as the bearing stress-slip relationship assumed for the FRP-concrete interface, the stress-strain law considered for reinforcing steel rebars and the cracking process in RC members resulting in the well-known tension stiffening effect. The considerations drawn from this study will be useful to researchers for the calibration of criteria and design rules for strengthening RC beams through MF-FRP laminates.
Keywords: FRP composites; external strengthening; structural rehabilitation FRP composites; external strengthening; structural rehabilitation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Martinelli, E.; Napoli, A.; Nunziata, B.; Realfonzo, R. RC Beams Strengthened with Mechanically Fastened Composites: Experimental Results and Numerical Modeling. Polymers 2014, 6, 613-633.

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