Deflection of Reinforced Concrete Beams Strengthened with Fiber-Reinforced Polymer (FRP) Plates

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Title: Deflection of Reinforced Concrete Beams Strengthened with Fiber-Reinforced Polymer (FRP) Plates

Author(s): Mahmoud T. El-Mihilmy and Joseph W. Tedesco

Publication: Structural Journal

Volume: 97

Issue: 5

Appears on pages(s): 679-688

Keywords: beam; deflection; polymer; reinforced concrete; repair; strength

Date: 9/1/2000

Abstract:
This paper investigates the deflection of reinforced concrete beams strengthened with fiber-reinforced polymer (FRP) plates. The calculated deflections of reinforced concrete beams strengthened with FRP using Branson’s equation, adopted by ACI Code, were found to be underestimated. Therefore, a method for calculating the deflections of FRP-strengthened reinforced concrete beams is proposed. In addition, alternative expressions for calculating the effective moment of inertia for FRP-strengthened beams at the cracking and post cracking stages are developed. The deflections calculated using the proposed expressions were found to correlate well with the measured deflections in laboratory beam tests. A numerical example illustrating use of the proposed procedure is also presented.