Bond of Fiber-reinforced Polymer Laminates to Concrete


Fiber-reinforced polymer (FRF) laminates are being successfully used worldwide for strengthening existing reinforced concrete structures. The bond of FRP reinforcement to the concrete substrate is of critical importance for the effectiveness of the technique. In this project, flexural test specimens were prepared to address some of the factors expected to affect bond, namely, bonded length, concrete strength, number of plies (stiffness), ply width, and, to a limited extent, surface preparation. Experimental results are presented and discussed herein. A linear bond stress-slip relationship, along with a simple shear model for the evaluation of the slip modulus, is used to predict the strain distribution at moderate load levels. Finally, expressions of the peeling load and the effective bond length are presented. A design equation is proposed for calculating the effective FRP ultimate strain to be used in design to account for bond-controlled failure.


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Bond; Concrete; Development length; External reinforcement; Fiber-reinforced polymers; Slip

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


File Type





© 2024 American Concrete Institute, All rights reserved.

Publication Date

01 May 2001

This document is currently not available here.