Anchorage Strength Models for FRP and Steel Plates Bonded to Concrete
Publication: Journal of Structural Engineering
Volume 127, Issue 7
Abstract
External bonding of steel plates has been used to strengthen deficient reinforced-concrete structures since the 1960s. In recent years, fiber-reinforced polymer (FRP) plates have been increasingly used to replace steel plates due to their superior properties. A key issue in the design of an effective retrofitting solution using externally bonded plates is the end anchorage strength. This paper first presents a review of current anchorage strength models for both FRP-to-concrete and steel-to-concrete bonded joints under shear. These models are then assessed with experimental data collected from the literature, revealing the deficiencies of all existing models. Finally, a new simple and rational model is proposed based on an existing fracture mechanics analysis and experimental observations. This new model not only matches experimental observations of bond strength closely, but also correctly predicts the effective bond length. The new model is thus suitable for practical application in the design of FRP-to-concrete as well as steel-to-concrete bonded joints.
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References
1.
American Concrete Institute (ACI). ( 1989). “Building code requirements for reinforced concrete.” ACI 318-89, Detroit.
2.
Bizindavyi, L., and Neale, K. W. ( 1997). “Experimental and theoretical investigation of transfer lengths for composite laminates bonded to concrete.” Proc., Annu. Conf. of Can. Soc. for Civ. Engrg., Vol. 6: Struct.—Compos. Mat., Struct. Sys., Telecommunication Towers, Sherbrooke, Québec, Canada, 51–60.
3.
Bizindavyi, L., and Neale, K. W. (1999). “Transfer lengths and bond strengths for composites bonded to concrete.”J. Compos. for Constr., ASCE, 3(4), 153–160.
4.
Blaschko, M., Niedermeier, R., and Zilch, K. ( 1996). “Bond failure modes of flexural members strengthened with FRP.” Fiber Compos. in Infrastruct., Proc., 2nd Int. Conf. on Compos. in Infrastruct., H. Saadatmanesh and M. R. Ehsani, eds., 315–327.
5.
British Standards Institution (BSI). ( 1985). “Structural use of concrete, Part 1: Code of practice for design and construction.” BSI 8110, London.
6.
Brosens, K., and van Gemert, D. ( 1997). “Anchoring stresses between concrete and carbon fibre reinforced laminates.” Non-Metallic (FRP) Reinforcement for Concrete Struct., Proc., 3rd Int. Symp., Japan Concrete Institute, Sapporo, 1, 271–278.
7.
Chaallal, O., Nollet, M. J., and Perraton, D. ( 1998). “Strengthening of reinforced concrete beams with externally bonded fibre-reinforced-plastic plates: Design guidelines for shear and flexure.” Can. J. Civ. Engrg., Ottawa, 25(4), 692–704.
8.
Chajes, M. J., Finch, W. W. Jr., Januszka, T. F., and Thonson, T. A. Jr. ( 1996). “Bond and force transfer of composite material plates bonded to concrete.” ACI Struct. J., 93(2), 295–303.
9.
Chajes, M. J., Januszka, T. F., Merta, D. R., Thomson, T. A. Jr., and Finch, W. W. Jr. ( 1995). “Shear strengthening of reinforced concrete beams using externally applied composite fabrics.” ACI Struct. J., 92(3), 295–303.
10.
Deutsches Institut für Normung, e.V. ( 1991). “DIN1048, Augsgabe 6.91, Teil 2: Prüfverfahren für Beton, Festbeton in Bauwerken und Bauteilen.” Beuth Verlag, Berlin (in German).
11.
Ehsani, M. R., Saadatmanesh, H., and Tao, S. (1996). “Design recommendations for bond of GFRP rebars to concrete.”J. Struct. Engrg., ASCE, 122(3), 247–254.
12.
FORCA tow sheets technical notes. (1994). Autocon Composites Inc., New York.
13.
Fukuzawa, K., Numao, T., Wu, Z., Yoshizawa, H., and Mitsui, M. ( 1997). “Critical strain energy release rate of interface debonding between carbon fibre sheet and mortar.” Non-Metallic (FRP) Reinforcement for Concrete Struct., Proc., 3rd Int. Symp., Japan Concrete Institute, Sapporo, 1, 295–302.
14.
Hiroyuki, Y., and Wu, Z. ( 1997). “Analysis of debonding fracture properties of CFS strengthened member subject to tension.” Non-Metallic (FRP) Reinforcement for Concrete Struct., Proc., 3rd Int. Symp., Japan Concrete Institute, Sapporo, 1, 287–294.
15.
Holzenkämpfer, O. ( 1994). “Ingenieurmodelle des verbundes geklebter bewehrung für betonbauteile.” Dissertation, TU Braunschweig (in German).
16.
Horiguchi, T., and Saeki, N. ( 1997). “Effect of test methods and quality of concrete on bond strength of CFRP sheet.” Non-Metallic (FRP) Reinforcement for Concrete Struct., Proc., 3rd Int. Symp., Japan Concrete Institute, Sapporo, 1, 475–482.
17.
Khalifa, A., Gold, W. J., Nanni, A., and Aziz, A. (1998). “Contribution of externally bonded FRP to shear capacity of RC flexural members.”J. Compos. for Constr., ASCE, 2(4), 195–203.
18.
Kobatake, Y., Kimura, K., and Ktsumata, H. ( 1993). “A retrofitting method for reinforced concrete structures using carbon fibre.” Fibre-reinforced-plastic (FRP) reinforcement for concrete structures: Properties and applications, A. Nanni, ed., Elsevier Science, Amsterdam, 435–450.
19.
MacGregor, J. G. ( 1988). Reinforced concrete: Mechanics and design, Prentice-Hall, Englewood Cliffs, N.J.
20.
Maeda, T., Asano, Y., Sato, Y., Ueda, T., and Kakuta, Y. ( 1997). “A study on bond mechanism of carbon fiber sheet.” Non-Metallic (FRP) Reinforcement for Concrete Struct., Proc., 3rd Int. Symp., Japan Concrete Institute, Sapporo, 1, 279–285.
21.
Malek, A. 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(1), 142–152.
22.
Neubauer, U., and Rostásy, F. S. ( 1997). “Design aspects of concrete structures strengthened with externally bonded CFRP plates.” Proc., 7th Int. Conf. on Struct. Faults and Repairs, ECS Publications, Edinburgh, Scotland, 2, 109–118.
23.
Niedermeier, R. ( 1996). “Stellungnahme zur Richtlinie für das Verkleben von Betonbauteilen durch Ankleben von Stahllaschen—Entwurf März 1996.” Schreiben 1390 vom 30.10.1996 des Lehrstuhls für Massivbau, Technische Universität München, Munich, Germany (in German).
24.
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(12/20), 229–233.
25.
Sato, Y., Ueda, T., Kakuta, Y., and Tanaka, T. ( 1996). “Shear reinforcing effect of carbon fibre sheet attached to side of reinforced concrete beams.” Proc., 2nd Int. Conf. on Advanced Compos. Mat. in Bridges and Struct., M. M. El-Badry, ed., Canadian Society for Civil Engineering, Montreal, 621–627.
26.
Smith, S. T., Teng, J. G., and Chen, J. F. ( 2001). “Debonding in FRP plated RC beams induced by intermediate cracking.” Proc., ACUN-3 Int. Conf.: Technol. Convergence in Compos. Applications, Sydney, Australia, 67–72.
27.
Swamy, R. N., Jones, R., and Charif, A. ( 1986). “Shear adhesion properties of epoxy resin adhesives.” Proc., Int. Symp. on Adhesion between Polymers and Concrete, Chapman and Hall, London, 741–755.
28.
Täljsten, B. ( 1994). “Plate bonding: Strengthening of existing concrete structures with epoxy bonded plates of steel or fibre reinforced plastics.” Doctoral thesis, Luleåa University of Technology, Sweden.
29.
Täljsten, B. ( 1997). “Defining anchor lengths of steel and CFRP plates bonded to concrete.” Int. J. Adhesion and Adhesives, 17(4), 319–327.
30.
Tanaka, T. ( 1996). “Shear resisting mechanism of reinforced concrete beams with CFS as shear reinforcement.” Graduation thesis, Hokkaido University, Japan.
31.
Teng, J. G., Chen, J. F., Smith, S. T., and Lam, L. ( 2000). RC structures strengthened with FRP composites, The Hong Kong Polytechnic University, Hong Kong, China.
32.
Triantafillou, T. C., and Plevris, N. ( 1992). “Strengthening of RC beams with epoxy-bonded fibre-composite materials.” Mat. and Struct., Paris, 25, 201–211.
33.
van Gemert, D. ( 1980). “Force transfer in epoxy-bonded steel-concrete joints.” Int. J. Adhesion and Adhesives, 1, 67–72.
34.
Varastehpour, H., and Hamelin, P. ( 1996). “Analysis and study of failure mechanism of RC beams strengthened with FRP plate.” Proc., 2nd Int. Conf. on Advanced Compos. Mat. in Bridges and Struct., M. El-Badry, ed., Canadian Society for Civil Engineering, Montreal, 527–537.
35.
Volnyy, V. A., and Pantelides, C. P. (1999). “Bond length of CFRP composites attached to precast concrete walls.”J. Compos. for Constr., ASCE, 3(4), 168–176.
36.
Yuan, H., and Wu, Z. ( 1999). “Interfacial fracture theory in structures strengthened with composite of continuous fiber.” Proc., Symp. of China and Japan: Sci. and Technol. of 21st Century, Tokyo, Sept., 142–155.
37.
Yuan, H., Wu, Z. S., and Yoshizawa, H. ( 2001). “Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates.” J. Struct. Mech. and Earthquake Engrg., Tokyo, in press.
38.
Zhang, S., Raoof, M., and Wood, L. A. ( 1997). “Prediction of peeling failure of reinforced concrete beams with externally bonded plates.” Proc., Inst. of Civ. Engrs., Struct. and Build., London, 122, 493–496.
39.
Ziraba, Y. N., Baluch, M. H., Basunbul, A. M., Azad, A. K., Al-Sulaimani, G. J., and Sharif, I. A. ( 1995). “Combined experimental-numerical approach to characterization of steel-glue-concrete interface.” Mat. and Struct., Paris, 28, 518–525.
Information & Authors
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Published In
Journal of Structural Engineering
Volume 127 • Issue 7 • July 2001
Pages: 784 - 791
History
Received: Mar 29, 2000
Published online: Jul 1, 2001
Published in print: Jul 2001
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