RESEARCH ARTICLE


Experimental and Analytical Study on Reinforced Concrete Beams in Bending Strengthened with FRP



C. C. Spyrakos*, 1, I. G. Raftoyiannis1, L. Credali2, J. Ussia2
1 Civil Engng Dept., National Technical University of Athens, Greece
2 Ardea e Sistemi S.r.l., Bolonia, Spain


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Creative Commons License
© 2014 C. Spyrakos et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Civil Engng Dept., National Technical University of Athens, Greece; Tel: 00302107721180; Fax: 00302107721182; E-mail: cspyrakos@central.ntua.gr


Abstract

The performance of the interface between fiber reinforced polymer (FRP) composites and concrete is one of the key factors affecting the behavior of strengthened reinforced concrete (RC) structures. Existing laboratory research has shown that RC beams strengthened with FRP sheets usually fail because of either debonding of the impregnated fabric from the concrete substrate or fracture of the FRP. This work presents an experimental and analytical investigation of the effectiveness of FRP strengthening sheets on RC beams aiming at increasing their flexural strength and stiffness. Experimental results obtained from beam specimens tested under four-point bending are examined with main parameters being the resin type and the anchoring system. In addition, the procedure suggested by the EC8 - Greek Assessment & Retrofitting Code (EC8-GARC) provisions is applied and compared with the experimental results.

Keywords: Anchoring systems, assessment of FRP design codes, concrete beam testing, FRP debonding, FRP failure modes, FRP strengthening.