CFRP SHEAR STRENGTHENING OF REINFORCED CONCRETE T-BEAMS WITH CORRODED SHEAR LINKS
Chan, Andrew HC
Journal of Composites for Construction
American Society of Civil Engineers
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Qin, S., Dirar, S., Yang, J., Chan, A. H., & Elshafie, M. (2014). CFRP SHEAR STRENGTHENING OF REINFORCED CONCRETE T-BEAMS WITH CORRODED SHEAR LINKS. Journal of Composites for Construction, 19 (04014081)https://doi.org/10.1061/(ASCE)CC.1943-5614.0000548
This paper investigates the structural behavior of uncorroded as well as corroded RC T-beams strengthened in shear with either externally bonded (EB) carbon fiber–reinforced polymer (CFRP) sheets or embedded CFRP rods. Nine tests were carried out on RC T-beams having an effective depth of 295 mm and a shear span to effective depth ratio of 3.05. The investigated parameters are the shear link corrosion level (uncorroded, 7% corroded, or 12% corroded) and type of CFRP strengthening system (EB CFRP sheets or embedded CFRP rods). The unstrengthened beams with shear link corrosion levels of 7 and 12% had shear strengths that were 11 and 14%, respectively, less than the shear strength of the uncorroded unstrengthened beam. Both the embedded CFRP rods and EB CFRP sheets were effective in enhancing the shear strength of tested beams but the effectiveness of both strengthening systems decreased with increasing shear link corrosion level. The shear strength enhancement provided by the embedded CFRP rods and EB CFRP sheets decreased from 19 and 15%, respectively, to 12 and 11%, respectively, with an increase in shear link corrosion level from 7 to 12%. Corrosion of the shear links did not have a significant effect on the beam stiffness. Premature debonding limited the effectiveness of the EB CFRP sheets whereas the embedded CFRP rods did not exhibit signs of debonding and therefore showed higher effectiveness.
Beams, Corrosion, Epoxy, Fiber-reinforced polymer, Rehabilitation, Reinforced concrete, Rods, Shear strength, Sheets
The authors would like to thank Fyfe Europe for supplying the CFRP sheets and epoxy laminating resin used in this study. The first author acknowledges the financial support of the UK Engineering and Physical Sciences Research Council.
External DOI: https://doi.org/10.1061/(ASCE)CC.1943-5614.0000548
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246614