Interfacial Stresses in Beams and Slabs Bondedwith Thin Plate
Publication: Journal of Engineering Mechanics
Volume 127, Issue 4
Abstract
A new popular method for retrofitting reinforced concrete beams and slabs is to bond fiber-reinforced plastic (FRP) plates to the soffit. An important failure mode for such strengthened members is the debonding of the FRP plate from the member due to high interfacial stresses near the plate ends. Accurate predictions of the interfacial stresses are a prerequisite for designing against debonding failures. In this paper, a theoretical interfacial stress analysis is presented for simply supported beams and slabs bonded with a thin FRP composite or steel plate and subjected to a uniformly distributed load in combination with a uniform bending moment. The analysis leads to an exact closed-form solution, in which a plane stress model is used for beams and a plane strain model is used for slabs. The salient features of the new analysis include the consideration of nonuniform stress distributions in and the satisfaction of the stress boundary conditions at the ends of the adhesive layer. Numerical results from the present analysis are presented both to demonstrate the advantages of the present solution over existing ones and to illustrate the main characteristics of interfacial stress distributions in beams and slabs.
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References
1.
An, W., Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthened with FRP plates: II. Analysis and parametric study.”J. Struct. Engrg., ASCE, 117(11), 3434–3455.
2.
Arduini, M., and Nanni, A. ( 1997). “Parametric study of beams with externally bonded FRP reinforcement.” ACI Struct. J., 94(5), 493–501.
3.
Chajes, M. J., Thomson, T. A., Jr. Januszka, T. F., and Finch, W. W., Jr. ( 1994). “Flexural strengthening of concrete beams using externally bonded composite materials.” Constr. and Build. Mat., 8(3), 191–201.
4.
Delale, F., Erdogan, F., and Aydinoglu, M. N. ( 1981). “Stresses in adhesively bonded joints: A closed-form solution.” J. Comp. Mat., 15(3), 249–271.
5.
Liu, Z., and Zhu, B. ( 1994). “Analytical solutions for R/C beams strengthened by externally bonded steel plates.” J. Tongji Univ., 22(1), 21–26 (in Chinese).
6.
Malek, M., Saadatmanesh, H., and Ehsani, M. R. ( 1998). “Prediction of failure load of R/C beams strengthened with FRP plate due to stress concentration at the plate end.” ACI Struct. J., 95(2), 142–152.
7.
Quantrill, R. J., Hollaway, L. C., and Thorne, A. M. ( 1996a). “Experimental and analytical investigations of FRP-strengthened beam response: Part I.” Mag. of Concrete Res., 48(177), 331–342.
8.
Quantrill, R. J., Hollaway, L. C., and Thorne, A. M. ( 1996b). “Predictions of the maximum plate end stresses of FRP strengthened beams: Part II.” Mag. of Concrete Res., 48(177), 343–351.
9.
Rabinovich, O., and Frostig, Y. (2000). “Closed-form high-order analysis of RC beams strengthened with FRP strips.”J. Compos. for Constr., ASCE, 4(2), 65–74.
10.
Roberts, T. M. ( 1989). “Approximate analysis of shear and normal stress concentrations in the adhesive layer of plated RC beams.” The Struct. Engr., London, 67(12), 229–233.
11.
Roberts, T. M., and Haji-Kazemi, H. ( 1989). “Theoretical study of the behaviour of reinforced concrete beams strengthened by externally bonded steel plates.” Proc., Instn. Civ. Engrs., Part 2, 87(1), 39–55.
12.
Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthened with GFRP plates: I. Experimental study.”J. Struct. Engrg., ASCE, 117(11), 3417–3433.
13.
Saadatmanesh, H., and Malek, A. M. (1998). “Design guidelines for flexural strengthening of RC beams with FRP plates.”J. Compos. for Constr., ASCE, 2(4), 158–164.
14.
Sharif, A., Al-Sulaimani, G. J., Basunbul, I. A., Baluch, M. H., and Ghaleb, B. N. ( 1994). “Strengthening of initially loaded reinforced concrete beams using FRP plates.” ACI Struct. J., 91(2), 160–168.
15.
Smith, S. T., and Teng, J. G. ( 2000). “Interfacial stresses in plated RC beams.” Engrg. Struct.
16.
Täljsten, B. (1997). “Strengthening of beams by plate bonding.”J. Mat. in Civ. Engrg., ASCE, 9(4), 206–212.
17.
Spadea, G., Bencardino, F., and Swamy, R. N. (1998). “Structural behavior of composite RC beams with externally bonded CFRP.”J. Compos. for Constr., ASCE, 2(3), 132–137.
18.
Vilnay, O. ( 1988). “The analysis of reinforced concrete beams strengthened by epoxy bonded steel plates.” The Int. J. Cement Compos. and Lightweight Concrete, 10(2), 73–78.
19.
Yuceoglu, U., and Updike, D. P. (1980). “Stress analysis of bonded plates and joints.”J. Engrg. Mech. Div., ASCE, 106(1), 37–56.
20.
Zhang, F. V. ( 1993). Interlaminar stresses in composite laminates, China Education Press, Beijing (in Chinese).
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Received: Jan 6, 2000
Published online: Apr 1, 2001
Published in print: Apr 2001
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