Generalized Evaluation of Bond Behavior of the Externally Bonded FRP Reinforcement to Concrete
Publication: Journal of Composites for Construction
Volume 24, Issue 6
Abstract
This paper presents a generalized evaluation method for determining the bond slip relationship of an external reinforcement bonded to concrete based on the experimental global force versus the displacement curve. The proposed method also provides several advantages, including predicting the global force versus displacement curve with any bond slip relationship, deriving the bond strength model, predicting the strain distribution along the fiber reinforced polymer (FRP)–concrete interface, and evaluating the effective bond length. An introductory example shows detailed implementation of the proposed method on an FRP–concrete interface reported in the literature. Since no prior assumption is made on the detailed configuration of the bond slip relationship using the proposed method, the obtained bond slip relationship can be seen more generalized and representative. The obtained bond slip relationship differs from the available bond slip models and leads to predictions that best approximate the experimental results. In addition, the reliability of the proposed method in determining the effective bond length is also verified against the experimental and analytical results.
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Acknowledgments
The research described in this paper was supported by the Key-Area Research and Development Program of Guangdong Province (2019B111107002), the National Key Research and Development Program of China (2018YFE0124900), the National Natural Science Foundation of China (51538007/51778370/51861165204), the Natural Science Foundation of Guangdong (2017B030311004), and the Shenzhen Science and Technology Project (GJHZ20180928155819738). The first two authors contributed equally.
Notation
The following symbols are used in this paper:
- bf
- width of FRP;
- Ef
- Young's modulus of FRP;
- fc
- compressive strength of concrete;
- ft
- tensile strength of concrete;
- Ga
- shear modulus of adhesive;
- Gf
- fracture energy;
- I(u)
- integral of bond slip relationship with respect to slip over [0, u];
- L
- bond length of FRP;
- Leff
- effective bond length;
- Pmax
- maximum applied force;
- P(u)
- applied force versus displacement curve;
- P(ui)
- ith force in the applied force versus displacement curve;
- s(x)
- slip of FRP at a point x;
- sf
- postpeak slip corresponding to null or insignificant bond stress;
- si
- slip of FRP at the ith point along the FRP–concrete interface;
- ta
- thickness of adhesive;
- tf
- thickness of FRP;
- u
- displacement applied at the loaded end of FRP;
- ui
- ith displacement in the applied force versus displacement curve;
- Δxi
- interval length of [xi−1, xi];
- ɛi
- strain of FRP at the ith point along the FRP–concrete interface;
- ɛL
- strain of FRP at the loaded end;
- ɛ(x)
- strain of FRP at a point x;
- τmax
- local bond strength of the bond slip relationship; and
- τ(s)
- bond slip relationship that is relationship between bond stress and slip.
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Published In
Journal of Composites for Construction
Volume 24 • Issue 6 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 4, 2020
Accepted: Jul 9, 2020
Published online: Sep 2, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 2, 2021
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