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http://dx.doi.org/10.12989/sem.2010.35.1.001

Experimental investigation on CFRP-to-concrete bonded joints across crack  

Anil, Ozgur (Civil Engineering Department, Gazi University)
Belgin, Cagatay M. (Civil Engineering Department, Gazi University)
Kara, M. Emin (Civil Engineering Department, Aksaray University)
Publication Information
Structural Engineering and Mechanics / v.35, no.1, 2010 , pp. 1-18 More about this Journal
Abstract
Bonding of carbon fiber reinforced polymer (CFRP) composites has become a popular technique for strengthening concrete structures in recent years. The bond stress between concrete and CFRP is the main factor determining the strength, rigidity, failure mode and behavior of a reinforced concrete member strengthened with CFRP. The accurate evaluation of the strain is required for analytical calculations and design processes. In this study, the strain between concrete and bonded CFRP sheets across the notch is tested. In this paper, indirect axial tension is applied to CFRP bonded test specimen by a four point bending tests. The variables studied in this research are CFRP sheet width, bond length and the concrete compression strength. Furthermore, the effect of a crack- modeled as a notch- on the strain distribution is studied. It is observed that the strain in the CFRP to concrete interface reaches its maximum values near the crack tips. It is also observed that extending the CFRP sheet more than to a certain length does not affect the strength and the strain distribution of the bonding. The stress distribution obtained from experiments are compared to Chen and Teng's (2001) analytical model.
Keywords
CFRP; bonding strain; bonded joints; debonding;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 3  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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1 Smith, S.T. and Teng, J.G. (2002b), "FRP-strengthened RC beams-II: assessment of debonding strength models", Eng. Struct., 24(4), 397-417.   DOI   ScienceOn
2 Smith, S.T. and Teng, J.G. (2003), "Shear-bending interaction in debonding failures of FRP-plated RC beams", Adv. Struct. Eng., 6(3), 183-199.   DOI   ScienceOn
3 Swamy, R.N., Jones, R. and Charif A. (1986), "Shear adhesion properties of epoxy resin adhesives", Proceedings of International Symposium on Adhesion between Polymers and Concrete, London.
4 Taljsten, B. (1997), "Defining anchor lengths of steel and CFRP plates bonded to concrete", Int. J. Adhes. Adhes., 17(4), 319-327.   DOI   ScienceOn
5 Teng, J.G., Chen, J.F., Smith, S.T. and Lam, L. (2002), FRP-strengthened RC Structures, Wiley, Chichester.
6 Teng, J.G., Smith, S.T., Yao, J. and Chen, J.F. (2003), "Intermediate crack-induced debonding in RC beams and slabs", Constr. Build Mater., 17(6-7), 447-462.   DOI   ScienceOn
7 Van Gemert, D. (1980), "Force transfer in epoxy-bonded steel-concrete joints", Int. J. Adhes. Adhes., 1(2), 67-72.   DOI   ScienceOn
8 Yao, J., Teng, J.G. and Chen, J.F. (2005), "Experimental study on FRP-to-concrete bonded joints", Compos. Part B-Eng., 36(4), 99-113.   DOI
9 Jayaprakash, J., Abdul Samad, A.A., Abbasovich, A.A. and Abang Ali, A.A. (2007), "Repair of precracked RC rectangular shear beams using CFRP strip technique", Struct. Eng. Mech., 26(4), 427-439.   DOI
10 Kobatake, Y., Kimura, K. and Ktsumata, H. (1993), "A retrofitting method for reinforced concrete structures using carbon fibre", Fiber-reinforced-plastic (FRP) Reinforcement for Concrete Structures: Properties and Applications (Ed. Nanni, A.), Elsevier Science, The Netherlands.
11 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", Mater. Struct., 28(9), 518-525.   DOI
12 Oehlers, D.J., Park, S.M. and Mohamed Ali, M.S. (2003), "A structural engineering approach to adhesive bonding of longitudinal plates to RC beams and slabs", Compos. Part A, 34(12), 887-897.   DOI
13 Mohamed Ali, M.S., Oehlers, D.J. and Bradford, M.A. (2001), "Shear peeling of steel plates bonded to the tension faces of RC beams", J. Struct. Eng-ASCE, 127(12), 1453-1460.   DOI   ScienceOn
14 Chajes, M.J., Januszka, T.F., Mertz, D.R., Thomson, Jr. T.A. and Finch, Jr. W.W. (1995), "Shear strengthening of reinforced concrete beams using externally applied composite fabrics", ACI Struct. J., 92(3), 295-303.
15 Bizindavyi, L. and Neale, K.W. (1999), "Transfer lengths and bond strengths for composites bonded to concrete", J. Compos. Constr., 3(4), 153-160.   DOI
16 Smith, S.T. and Teng, J.G. (2002a), "FRP-strengthened RC beams-I: review of debonding strength models", Eng. Struct., 24(4), 385-395.   DOI   ScienceOn
17 Maeda, T., Asano, Y., Ueda, T. and Kakuta, Y. (1997), "A study on bond mechanism of carbon fiber sheet, Nonmetallic (FRP) reinforcement for concrete structures", Proceedings of Third International Symposium, Japan Concrete Institute, Sapporo.
18 Mohamed Ali, M.S., Oehlers, D.J. and Bradford, M.A. (2002), "Interaction between flexure and shear on the debonding of RC beams retrofitted with compression face plates", Adv. Struct. Eng., 5(4), 223-230.   DOI   ScienceOn
19 Neubauer, U. and Rostásy, F.S. (1997), "Design aspects of concrete structures strengthened with externally bonded CFRP plates", Proceedings of Seventh International Conference on Structural Faults and Repairs, Vol. 2, ECS Publications, Edinburgh.
20 Oehlers, D.J. and Moran, J.P. (1990), "Premature failure of externally plated reinforced concrete beams", J. Struct. Eng-ASCE, 116(4), 978-995.   DOI
21 Chen, J.F. and Teng, J.G. (2001), "Anchorage strength models for FRP and steel plates bonded to concrete", J. Struct. Eng-ASCE, 127(7), 784-791.   DOI   ScienceOn
22 Chen, J.F. and Teng, J.G. (2003), "Shear capacity of FRP strengthened RC beams: FRP debonding", Constr. Build Mater., 17(1), 27-41.   DOI   ScienceOn
23 De Lorenzis, L., Miller, B. and Nanni, A. (2001), "Bond of fiber-reinforced polymer laminates to concrete", ACI Mater. J., 98(3), 256-264.
24 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 structures", Proceedings of the Third International Symposium, Vol. 1, Japan Concrete Institute, Sapporo.
25 Hiroyuki, Y. and Wu, Z. (1997), "Analysis of debonding fracture properties of CFS strengthened member subject to tension, Non-metallic (FRP) reinforcement for concrete structures", Proceedings of the Third International Symposium, Vol. 1, Japan Concrete Institute, Sapporo.
26 Brosens, K. and van Gemert, D. (1997), "Anchoring stresses between concrete and carbon fiber reinforced laminates, Non-metallic (FRP) reinforcement for concrete structures", Proceedings of the Third International Symposium, vol. 1, Japan Concrete Institute, Sapporo.
27 Chajes, M.J., Finch, Jr. W.W., Januszka, T.F. and Thomson, Jr. T.A. (1996), "Bond and force transfer of composites material plates bonded to concrete", ACI Struct. J., 93(2), 209-217.
28 Bizindavyi, L. and Neale, K.W. (1997), "Experimental and theoretical investigation of transfer lengths for composite laminates bonded to concrete", Proceedings of the Annual Conference of Canadian Society for Civil Engineering, Vol. 6: Structures-Composites Materials, Structural Systems, Telecommunications Towers, Sherbrooke, Quebec.