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Open AccessArticle

Experimental and Analytical Investigation on Flexural Retrofitting of RC T-Section Beams Using CFRP Sheets

1
Department of Civil and Environmental Engineering, Western University, London, ON N6A 5B9, Canada
2
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1233; https://doi.org/10.3390/app10041233
Received: 1 December 2019 / Revised: 16 January 2020 / Accepted: 4 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Assessing and Extending the Service Life of Bridges)
The large portfolio of aging highway bridges worldwide includes many reinforced concrete T-section beams with various levels of damage and degradation. However, there is currently dearth of research on the anchoring behavior of CFRP sheets used for strengthening such RC T-section beams. Moreover, there is a need for rational and accurate analytical models to predict the strengthening effect of CFRP sheets for RC T-section beams. In this study, eight RC T-section beam specimens strengthened with externally bonded CFRP sheets were tested under quasi-static loading. The failure mode, cracking resistance, yielding and ultimate capacity were examined. The effects of U-wrap spacing, flexural reinforcing ratio, and concrete compressive strength on the flexural behavior of the CFRP strengthened RC T-section beams were analyzed and discussed. New analytical models were developed to predict the cracking, yielding and ultimate load resistance of the RC T-section beams strengthened with CFRP sheets. The analytical models were validated through comparing its predictions with experimental results, and they demonstrated adequate accuracy. The findings could be deployed for the retrofitting of a large portfolio of aging highway bridges with deteriorated reinforced concrete T-section beams. View Full-Text
Keywords: highway bridges; reinforced concrete; T-section beam; retrofitting; CFRP; flexural behavior highway bridges; reinforced concrete; T-section beam; retrofitting; CFRP; flexural behavior
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Zhang, Y.; Nehdi, M.L. Experimental and Analytical Investigation on Flexural Retrofitting of RC T-Section Beams Using CFRP Sheets. Appl. Sci. 2020, 10, 1233.

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