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Flexural response of reinforced concrete (RC) beams strengthened with near surface mounted (NSM) fibre reinforced polymer (FRP) bars

The behaviour of RC beams strengthened with NSM FRP bars was experimentally investigated. Eight beams were tested under four point bending. The effects of material type, epoxy properties, bar size and the number of NSM bars were studied. The tested beams were strengthened with a limited bond length in order to imitate as much as possible work-place conditions, as the grooves could only be cut up to the faces of the supporting columns with difficulty. The load capacity, deflection, mode of failure, FRP strain, concrete strain, free end slip and the transverse strain in epoxy and concrete of the tested beams were all analysed. Comparison of strengthened and control beams showed enhancement of 155.8% and 129.8% in the yielding loads, while the increase in the ultimate loads was 166.3% and 159.4% for beams strengthened with carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP) respectively. The beams strengthened with CFRP bars experienced higher stiffness than the corresponding beams with GFRP bars. Epoxy properties, size and number of bars had little effect on the load capacity of the strengthened beams with failures mainly occurring either in epoxy or as a result of concrete cover separation

The authors acknowledge the support provided by the Spanish Government (Ministerio de Ciencia e Innovacion), Project ref. BIA2010-20234-C03-02. The first author also acknowledges the support from the Generalitat de Catalunya for an FI pre-doctoral Grant, ref. 2011FI_B 00003

© Composite Structures, 2014, vol. 109, p. 8-22

Elsevier

Author: Sharaky, Ibrahim Attia
Torres Llinàs, Lluís
Comas Baron, Jordi
Barris Peña, Cristina
Date: 2014
Abstract: The behaviour of RC beams strengthened with NSM FRP bars was experimentally investigated. Eight beams were tested under four point bending. The effects of material type, epoxy properties, bar size and the number of NSM bars were studied. The tested beams were strengthened with a limited bond length in order to imitate as much as possible work-place conditions, as the grooves could only be cut up to the faces of the supporting columns with difficulty. The load capacity, deflection, mode of failure, FRP strain, concrete strain, free end slip and the transverse strain in epoxy and concrete of the tested beams were all analysed. Comparison of strengthened and control beams showed enhancement of 155.8% and 129.8% in the yielding loads, while the increase in the ultimate loads was 166.3% and 159.4% for beams strengthened with carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP) respectively. The beams strengthened with CFRP bars experienced higher stiffness than the corresponding beams with GFRP bars. Epoxy properties, size and number of bars had little effect on the load capacity of the strengthened beams with failures mainly occurring either in epoxy or as a result of concrete cover separation
The authors acknowledge the support provided by the Spanish Government (Ministerio de Ciencia e Innovacion), Project ref. BIA2010-20234-C03-02. The first author also acknowledges the support from the Generalitat de Catalunya for an FI pre-doctoral Grant, ref. 2011FI_B 00003
Format: application/pdf
ISSN: 0263-8223 (versió paper)
1879-1085 (versió electrònica)
Document access: http://hdl.handle.net/10256/11957
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2011-2013/BIA2010-20234-C03-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.compstruct.2013.10.051
Articles publicats (D-EMCI)
Is part of: © Composite Structures, 2014, vol. 109, p. 8-22
Rights: Tots els drets reservats
Subject: Assaigs de materials
Materials -- Testing
Formigó armat -- Proves
Reinforced concrete -- Testing
Resistència de materials
Strength of materials
Esforç i tensió
Strains and stresses
Flexió (Mecànica)
Flexure
Title: Flexural response of reinforced concrete (RC) beams strengthened with near surface mounted (NSM) fibre reinforced polymer (FRP) bars
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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