Behavior of Two-Way RC Slabs Externally Bonded with Steel Plate
Publication: Journal of Structural Engineering
Volume 127, Issue 4
Abstract
Although a great deal of research has been carried out in recent years on the use of plate bonding for strengthening reinforced concrete (RC) structures, so far this work has generally been limited to RC beams and one-way slabs, with little work on two-way slabs. This paper presents the results of a recent study on the behavior and strength of two-way square RC slabs bonded with a steel plate. Experimental load-deflection curves, failure modes, and strengths of plated slabs under a central concentrated load are first reported. These results show that debonding failures are unlikely in these plated slabs, contrary to the case of plated beams, and there are significant strength gains due to the bonded steel plate as a result of a modified yield line pattern. Yield line analyses are then described for these slabs, and the results are found to match experimental results closely. The yield line method is thus suitable for practical use to determine the strength of these plated slabs.
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References
1.
An, W., Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthened with GFRP 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.
Buyukozturk, O., and Hearing, B. (1998). “Failure behavior of pre-cracked concrete beams retrofitted with FRP.”J. Compos. for Constr., ASCE, 2(3), 138–144.
4.
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.
5.
Civ. Engrs. Australia, Sept., 55.
6.
Erki, M. A., and Heffernan, P. J. ( 1995). “Reinforced concrete slabs externally strengthened with fibre-reinforced plastic materials.” Non-metallic (FRP) reinforcement for concrete structures, L. Taerwe, ed., E&FN Spon, London.
7.
Godfrey, J., and Sharkey, P. ( 1996). “Plate bonding to strengthen hall floor.” Constr. Repair, (July/Aug.), 39–40.
8.
Ichimasu, H., Maruyama, M., Watanabe, H., and Hirose, T. ( 1993a). “RC slabs strengthened by bonded carbon FRP plates: Part 1—Laboratory study.” Fiber-reinforced-plastic reinforcement for concrete structures, ACI SP-138, A. Nanni and C. W. Dolan, eds., American Concrete Institute, Detroit, 933–955.
9.
Ichimasu, H., Maruyama, M., Watanabe, H., and Hirose, T. ( 1993b). “RC slabs strengthened by bonded carbon FRP plates: Part 2—Application.” Fiber-reinforced-plastic reinforcement for concrete structures, ACI SP-138, A. Nanni and C. W. Dolan, eds., American Concrete Institute, Detroit, 957–970.
10.
Johansen, K. W. ( 1962). Yield line theory, Cement and Concrete Association, London.
11.
Jones, L. L., and Wood, R. H. ( 1967). Yield line analysis of slabs, Elsevier Science, New York.
12.
Jones, R., Swamy, R. N., and Charif, A. ( 1988). “Plate separation and anchorage of reinforced concrete beams strengthened by epoxy-bonded steel plates.” The Struct. Engr., London, 66(5), 85–94.
13.
Kong, F. K., and Evans, H. R. ( 1987). Reinforced and prestressed concrete, 3rd Ed., Chapman & Hall, London.
14.
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.
15.
Ministry of Construction of P. R. China. ( 1994). Code for design of concrete structures—GBJ 10-89, New World Press, Beijing.
16.
Nguyen, N. T., Oehlers, D. J., and Bradford, M. A. ( 1998). “Models for the flexural peeling of angle plates glued to R-C beams.” Adv. in Struct. Engrg., 1(4), 287–300.
17.
Oehlers, D. J., and Moran, J. P. (1990). “Premature failure of externally plated reinforced concrete beams.”J. Struct. Engrg., ASCE, 116(4), 978–995.
18.
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.
19.
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.
20.
Raoof, M., El-Rimawi, J. A., and Hassanen, M. A. H. ( 2000). “Theoretical and experimental study on externally plated RC beams.” Engrg. Struct., 22(1), 85–101.
21.
Raoof, M., and Zhang, S. ( 1997). “An insight into the structural behaviour of reinforced concrete beams with externally bonded plates.” Proc., Instn. of Civ. Engrs.—Struct. & Build., 122, 477–492.
22.
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.
23.
Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthened with GFRP plates. I: Experimental study.”J. Struct. Engrg., ASCE, 117(11), 3417–3433.
24.
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.
25.
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.
26.
Smith, S. T., Bradford, M. A., and Oehlers, D. J. (1999a). “Local buckling of side-plated reinforced-concrete beams. I: Theoretical study.”J. Struct. Engrg., ASCE, 125(6), 622–634.
27.
Smith, S. T., Bradford, M. A., and Oehlers, D. J. (1999b). “Local buckling of side-plated reinforced-concrete beams. II: Experimental study.”J. Struct. Engrg., ASCE, 125(6), 635–643.
28.
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.
29.
Swamy, R. N., Jones, R., and Bloxham, J. W. ( 1987). “Structural behaviour of reinforced concrete beams strengthened by epoxy-bonded steel plates.” The Struct. Engr., London, 65A(2), 59–68.
30.
Swamy, R. N., and Mukhopadhyaya, P. ( 1999). “Debonding of carbon-fibre-reinforced polymer plate from concrete beams.” Proc., Instn. of Civ. Engrs.—Struct. & Build., 134, 301–317.
31.
Täljsten, B. (1997). “Strengthening of beams by plate bonding.”J. Mat. in Civ. Engrg., ASCE, 9(4), 206–212.
32.
Teng, J. G., Lam, L., Chan, W., and Wong, J. (2000). “Retrofitting of deficient RC cantilever slabs using GFRP strips.”J. Compos. for Constr., ASCE, 4(2), 75–84.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 127 • Issue 4 • April 2001
Pages: 390 - 397
History
Received: Apr 6, 1999
Published online: Apr 1, 2001
Published in print: Apr 2001
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