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Abstract

For concrete beams strengthened with FRP plates, FRP debonding may occur from the bottom of an intermediate flexural or shear/flexural crack in the span. As debonding failure occurs within the concrete, interfacial friction resulted from aggregate interlocking between opposing surfaces of the debonded zone plays an important role in the debonding behavior. Interfacial debonding can be analyzed with a three-parameter model. To investigate the effect of concrete composition on the debonding behavior, the direct shear test was conducted with ten different compositions of concrete. Interfacial parameters corresponding to each concrete composition were then derived according to the analytical model. It is found that the concrete compressive or splitting tensile strength shows little correlation with interfacial parameters. However, the debonding initiation strength and residual shear strength correlates well with the surface tensile strength, and the maximum sliding between FRP and concrete is mainly governed by the aggregate content. Test results indicate that the composition of concrete should be considered explicitly in the investigation of FRP debonding from a concrete substrate.

Keywords

FRP concrete composition debonding interfacial parameters

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References

Bizindavyi

and Neale

K.W.

(1999). “Transfer length and bond strengths for composites bonded to concrete”, Journal of composites for construction, Vol. 3, No. 4, pp. 153–160.

Chajes

M.J.

Finch

W.W.

Januszka

T.F.

and Thomosh

T.A.

(1996). “Bond and force transfer of composite material plates bonded to concrete”, ACI Structural Journal, Vol. 93, No. 2, pp. 231–244.

Chen

J.F.

and Teng

J.G.

(2001). “Anchorage strength models for FRP and steel plates bonded to concrete”, Journal of Structural Engineering, ASCE, Vol. 127, No. 7, pp. 784–791.

Holzenkampfer

(1994). Ingenieurmoddelle des Verbundes geklebter Bewehrung fur Betonbauteile, Dissertation, TU Braunschweig, in German.

De Lorenzis

Miller

and Nanni

(2001). “Bond of fiber-reinforced polymer laminates to concrete”, ACI material Journal, Vol. 98, No. 3, pp. 256–264

Leung

C.K.Y.

(2001). “Delamination failure in concrete beams retrofitted with a bonded plate”, Journal of Materials in Civil Engineering, ASCE, Vol. 13, No. 2, pp. 106–113

Leung

C.K.Y.

(2006). “FRP debonding from a concrete substrate: Some recent findings against conventional belief”, Cement and Concrete Composites, Vol. 28, No. 8, p. 742–748.

Leung

C.K.Y.

and Tung

W.K.

(2006). “Three-parameter model for debonding of FRP plate from concrete substrate”, Journal of Engineering Mechanics, ASCE, Vol. 132, No. 5, pp. 509–518.

Liu

I.S.T.

Oelhlers

D.J.

and Seracino

(2007). “Study of intermediate crack debonding in adhesively plated beams”, Journal of Composites for Construction, Vol. 11, No. 2, pp. 175–183.

10.

Meier

(1995). “Strengthening of structures using carbon fibre/epoxy composites”, Construction Building Material, Vol. 9, No. 6, pp. 341–351.

11.

Neubauer

and Rostasy

F.S.

(1997). “Design aspects of concrete structures strengthened with externally bonded CFRP plates”, Proceeding of the Seventh International conference on structural Faults and Repairs, Forde

M.C.

, eds., Engineering Technics Press, Edinburgh, UK, pp. 109–118.

12.

Pan

J.L.

and Leung

C.K.Y.

(2007). “Effect of concrete composition on FRP/concrete bond capacity”, Journal of Composites for Construction, Vol. 11, No. 6, pp. 611–618.

13.

Rahami

and Hutchinson

(2001). “Concrete beams strengthened with externally bonded FRP plates”, Journal of Composites for Construction, Vol. 5, No. 1, pp. 44–56.

14.

Rosenboom

and Rizkalla

(2008). “Modeling of IC debonding of FRP-strengthened concrete flexure members”, Journal of Composites for Construction, Vol. 12, No. 2, pp. 168–179.

15.

Saadatmanesh

and Ehsani

M.R.

(1991). “RC beams strengthened with GFRP plates. I: Experimental study”, Journal of Structural Engineering, ASCE, Vol. 117, No. 11, pp. 3417–343.

16.

Smith

S.T.

and Teng

J.G.

(2003). “Shear-bending interaction in debonding failure of FRP-plated RC beams”, Advances in Structural Engineering, Vol. 6, No. 3, pp. 183–199.

17.

Taljsten

(1997). “Strengthening of beams by plate bonding”, Journal of Materials in Civil Engineering, Vol. 9, No. 4, pp. 206–212.

18.

Triantafillou

T.C.

and Plevris

(1992). “Strengthening of R/C beams with epoxy-bonded fiber composite materials”, Materials and Structures, Vol. 25, No. 4, pp. 201–211.

19.

Van Gemert

(1980). “Force transfer in epoxy-bonded steel-concrete joints”, International Journal of Adhesion and Adhesive, Vol. 1, No. 1, pp. 67–72.

20.

Wei

Saadatmanesh

and Ehsani

M.R.

(1991). “RC beams strengthened with FRP plates II: Analysis and parametric study”, Journal of Structural Engineering, ASCE, Vol. 117, No. 11, pp. 3434–3455.

21.

Yao

and Teng

J.G.

(2007a). “Plate end debonding in FRP-plated RC beams-I: Experiments”, Engineering Structures, Vol. 29, No. 10, pp. 2457–2471.

22.

Yao

and Teng

J.G.

(2007b). “Plate end debonding in FRP-plated RC beams-II: Strength model”, Engineering Structures, Vol. 29, No. 10, pp. 2472–2486.

23.

Yuan

Z.S.

and Yoshizawa

(2001). “Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates”, Journal of Structural Mechanics and Earthquake Engineering, JSCE, Vol. 675, No. 1–55, pp. 27–39.

Effect of Concrete Composition on Interfacial Parameters Governing FRP Debonding from the Concrete Substrate

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