Delamination Failure in Concrete Beams Retrofitted with a Bonded Plate
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Materials in Civil Engineering
Volume 13, Issue 2
Abstract
Concrete beams are often retrofitted with bonded steel or composite plates. The failure of the retrofitted member is usually due to delamination of the plate from the beam. Delamination can occur either at the end of the reinforcing plate or at the location of a crack in the concrete beam. This paper will focus on the analysis of delamination initiated at the mouth of a flexural crack. When loading is applied, the flexural crack tends to open and hence induces high interfacial shear stress that may result in delamination. The relation between interfacial shear stress and applied moment is affected by many material and geometric parameters. In this study, the bridging stress in the bonded plate and the maximum interfacial shear stress τmax are first related to the crack mouth opening. A fracture mechanics based analysis is then carried out to obtain the crack mouth opening and τmax for a given applied moment. Through a systematic parametric analysis, the effect of various parameters on τmax is deduced. A combination of parameters that will increase τmax, and hence increase the likelihood of delamination, can hence be identified and avoided in design.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bogy, D. B. ( 1971). “On the plane elastostatic problem of a loaded crack terminating at a material interface.” J. Appl. Mech., 38, 911–918.
2.
Bosco, C., and Carpinteri, A. ( 1992). “Fracture mechanics evaluation of minimum reinforcement in concrete structures.” Applications of fracture mechanics to reinforced concrete, A. Carpinteri, ed., Elsevier Applied Science, London, 231–265.
3.
Kaar, P. H., and Mattock, A. H. ( 1963). “High strength bar as concrete reinforcement, Part 4. Control of cracking.” J. PCA R&D Labs, 7(1), 42–53.
4.
Malik, 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.
5.
Meier, U. ( 1997). “Post strengthening by continuous fiber laminates in Europe.” Non-metallic (FRP) reinforcement for concrete structures, Vol. 1, Japan Concrete Institute, 41–56.
6.
Meier, U., Deuring, M., Meier, H., and Schwegler, G. ( 1992). “Strengthening of structures with CFRP laminates: Research and applications in Switzerland.” Advanced composite materials in bridges and structures, Canadian Society for Civil Engineering, 243–251.
7.
Neale, K. W., and Laboissiere, P. ( 1997). “State-of-the-art report on retrofitting and strengthening by continuous fibre in Canada.” Non-metallic (FRP) reinforcement for concrete structures, Vol. 1, Japan Concrete Institute, 25–40.
8.
Rooke, D. P., and Jones, D. A. ( 1978). “Stress intensity factors in fretting fatigue.” J. Strain Anal., 119(1), 1–7.
9.
Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthened with FRP plates. I: Experimental study.”J. Struct. Engrg., ASCE, 117(11), 3417–3433.
10.
Taljsten, B. ( 1996). “Strengthening of concrete prisms using the plate-bonding technique.” Int. J. Fracture, 82, 253–266.
11.
Taljsten, B. (1997). “Strengthening of beams by plate bonding.”J. Mat. in Civ. Engrg., ASCE, 9(4), 206–212.
12.
Triantafillou, T. C., and Plevris, N. ( 1992). “Strengthening of R/C beams with epoxy-bonded fiber composite materials.” Mat. and Struct., Paris, 25, 201–211.
13.
Wei, A., 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.
14.
Wu, X. R., and Carlsson, A. J. ( 1991). Weight functions and stress intensity factor solutions, Pergamon, Oxford, England.
15.
Wu, Z., Matsuzaki, T., and Tanabe, K. ( 1997). “Interface crack propagation in FRP-strengthened concrete structures.” Non-metallic (FRP) reinforcement for concrete structures, Vol. 1, Japan Concrete Institute, 319–326.
Information & Authors
Information
Published In
History
Received: Jun 18, 1999
Published online: Apr 1, 2001
Published in print: Apr 2001
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.