Contribution of externally bonded FRP shear reinforcement to the shear strength of RC beams

An experimental program of T-beams strengthened in shear by CFRP sheets has been developed with two longitudinal reinforcement ratios and different externally bonded CFRP shear strengthening amounts in a discontinuous or continuous U-shaped configuration with and without mechanical anchorages. The e...

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Bibliographic Details
Published in:Composites. Part B, Engineering Engineering, 2019-05, Vol.164, p.235-248
Main Authors: Oller, Eva, Pujol, Mireia, Marí, Antonio
Format: Article
Language:English
Subjects:
Bigues de formigó
Concrete beams
Enginyeria civil
Externally bonded FRP
Materials i estructures
Materials i estructures de formigó
Shear
Shear components
Shear strength
Sheets
Strengthening
Àrees temàtiques de la UPC
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Summary:An experimental program of T-beams strengthened in shear by CFRP sheets has been developed with two longitudinal reinforcement ratios and different externally bonded CFRP shear strengthening amounts in a discontinuous or continuous U-shaped configuration with and without mechanical anchorages. The effectiveness of the external reinforcement without anchorages was low regardless the CFRP reinforcement ratio. There is an evidence of the interaction of the different shear strength components, concrete Vc, transverse steel Vs, CFRP sheets Vf that have been obtained from the registered data of the instrumentation. This interaction might explain that the ultimate shear force of some CFRP-strengthened beams was lower than the one of the control beam. There is a significant difference between the sum of the Vc, Vs, and Vf components and the total shear force. This difference is assumed to be carried out by the flange (including its internal transverse reinforcement), which represents a significant percentage of the total shear strength (with a mean value of 38%). Finally, the contribution of the CFRP has been obtained by different existing guidelines and has been compared to the experimental values.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2018.11.065