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Precracked RC T-beams Repaired in Shear with Externally Bonded CFRP Sheets


Type

Article

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Authors

Dirar, Samir 
Lees, Janet M 
Morley, Chris T 

Abstract

This study investigates the structural behavior of precracked reinforced concrete (RC) T-beams strengthened in shear with externally bonded carbon fiber-reinforced polymer (CFRP) sheets. It reports on seven tests on unstrengthened and strengthened RC T-beams, identifying the influence of load history, beam depth, and percentage of longitudinal steel reinforcement on the structural behavior. The experimental results indicate that the contributions of the external CFRP sheets to the shear force capacity can be significant and depend on most of the investigated variables. This study also investigates the accuracy of the prediction of the fiber-reinforced polymer (FRP) contribution in ACI 440.2R-08, UK Concrete Society TR55, and fib Bulletin 14 design guidelines for shear strengthening. A comparison of predicted values with experimental results indicates that the guidelines can overestimate the shear contribution of the externally bonded FRP system.

Description

This is the accepted version of the original publication available here: http://www.concrete.org/PUBS/JOURNALS/OLJDetails.asp?Home=SJ&ID=51683632.

Keywords

beam, fibre reinforced polymers, precracking, reinforced concrete, shear, strengthening

Journal Title

ACI Structural Journal

Conference Name

Journal ISSN

Volume Title

109

Publisher

American Concrete Institute

Publisher DOI

Publisher URL

Sponsorship
This work was funded by the Engineering and Physical Sciences Research Council [grant number GR/S55101/01].