International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
권호 표지
DOI QR코드

DOI QR Code

An Analytical Model for FRP Debonding in Strengthened RC Beams under Monotonic and Cyclic Loads

  • Moein, Reza Saeidi (Department of Civil and Environmental Engineering, Tarbiat Modares University) ;
  • Tasnimi, Abbas Ali (Department of Civil and Environmental Engineering, Tarbiat Modares University)
  • Received : 2015.12.01
  • Accepted : 2016.09.28
  • Published : 2016.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

Reinforced concrete (RC) beams strengthened by externally bonded reinforcement often fail by debonding. This paper presents an experimental and analytical study aimed at better understanding and modeling the fiber reinforced polymer (FRP) debonding failures in strengthened RC beams under monotonic and cyclic loads. In order to investigate the flexural behavior and failure modes of FRP-strengthened beams under monotonic and cyclic loadings, an experimental program was carried out. An analytical study based on the energy balance of the system was also performed. It considers the dominant mechanisms of energy dissipation during debonding and predicts the failure load of the strengthened beams. Validation of the model was carried out using test data obtained from the own experimental investigation.

Keywords

References

  1. Achintha, M., & Burgoyne, C. (2011). Fracture mechanics of plate debonding: Validation against experiment. Construction and Building Materials, 25, 2961-2971. https://doi.org/10.1016/j.conbuildmat.2010.11.103
  2. Achintha, M., & Burgoyne, C. (2012). Prediction of FRP debonding using the global-energy-balance approach. Magazine of Concrete Research, 64(11), 1033-1044. https://doi.org/10.1680/macr.11.00182
  3. Achintha, M., & Burgoyne, C. (2013). Fracture energy of the concrete-FRP interface in strengthened beams. Journal of Engineering Fracture Mechanics, 110, 38-51. https://doi.org/10.1016/j.engfracmech.2013.07.016
  4. Bazant, Z. P., & Becq-Giraudon, E. (2001). Statistical prediction of fracture parameters of concrete and implications for choice of testing standard. Cement and Concrete Research, 32(4), 529-556. https://doi.org/10.1016/S0008-8846(01)00723-2
  5. Bencardino, F., & Condello, A. (2016). Eco-friendly external strengthening system for existing reinforced concrete beams. Journal of Composites-Part B: Engineering, 93, 163-173. https://doi.org/10.1016/j.compositesb.2016.03.022
  6. Buyukozturk, O., Gunes, O., & Karaca, E. (2002). Characterization and modeling of debonding in RC beams strengthened with FRP composites. In Proceedings of the 15th ASCE conference on engineering mechanics. New York, NY: Columbia University.
  7. Ceroni, F. (2010). Experimental performances of RC beams strengthened with FRP materials. Construction and Building Materials, 24, 1547-1559. https://doi.org/10.1016/j.conbuildmat.2010.03.008
  8. Ceroni, F., & Pecce, M. (2005). Strength and ductility of RC beams strengthened with FRP materials under monotonic and cyclic loads. The fib symposium on keep concrete attractive, Budapest, Hungary.
  9. Ceroni, F., & Pecce, M. (2010). Evaluation of bond strength in concrete elements externally reinforced with CFRP sheets and anchoring devices. Journal of Composites for Construction, 14(5), 521-530. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000118
  10. Ceroni, F., Pecce, M., Matthys, S., & Taerwe, L. (2008). Bond tests on concrete elements with CFRP and anchorage systems. Journal of Composites-Part B, 39, 429-441. https://doi.org/10.1016/j.compositesb.2007.05.002
  11. Comite Euro-International du Beton-Federation Internationale de la Precontrainte. (1991). CEB-FIP Model Code. Lausanne, Switzerland.
  12. Coronado, C. A., & Lopez, M. M. (2008). Experimental characterization of concrete-epoxy interfaces. Journal of Materials in Civil Engineering ASCE, 20(4), 303-312. https://doi.org/10.1061/(ASCE)0899-1561(2008)20:4(303)
  13. Esfahani, M. R., Kianoush, M. R., & Tajari, A. R. (2007). Flexural behavior of reinforced concrete beams strengthened by CFRP sheets. Engineering Structures, 29, 2428-2444. https://doi.org/10.1016/j.engstruct.2006.12.008
  14. Filiatrault, A., Wanitkorkul, A., & Constantinou, M. (2008). Development and appraisal of a numerical cyclic loading protocol for quantifying building system performance. Report MCEER-08-0013, pp. 3-4.
  15. Galvez, J. C., Elices, M., Guinea, G. V., & Planas, J. (1998). Mixed mode fracture of concrete under proportional and non-proportional loading. International Journal of Fracture, 94(3), 267-284. https://doi.org/10.1023/A:1007578814070
  16. Gamata, G., Spacone, E., & Zarnic, R. (2007). Experimental and nonlinear finite element studies of RC beams strengthened with FRP plates. Journal of Composites-Part B: Engineering, 38, 277-288. https://doi.org/10.1016/j.compositesb.2005.12.003
  17. Guinea, G. V., Planas, J., & Elices, M. (1994). A general bilinear fit for the softening curve of concrete. Materials and Structures, 27(2), 99-105. https://doi.org/10.1007/BF02472827
  18. Gunes, O., Karaca, E., & Gunes, B. (2006). Design of FRP retrofitted flexural members against debonding failures. In Proceedings of the 8th U.S. national conference on earthquake engineering, San Francisco, CA.
  19. Gustafsson, P. J., & Hillerborg, A. (1985). Improvements in concrete design achieved through the application of fracture mechanics. In S. P. Shah (Ed.), Application of fracture mechanics to cementitious composites (pp. 639-680).
  20. Dordrecht, Netherlands: Springer, CE. Hearing B., & Buyukozturk O. (1997). Failure behavior of precracked concrete retrofitted with fiber reinforced plastic laminates. In Proceedings of the 7th international conference on structural faults and repair. Edinburgh, UK.
  21. Hutchinson, J. W., & Suo, Z. (1992). Mixed mode cracking in layered materials. Advances in Applied Mechanics, 191, 29-63.
  22. Li, V. C., Lim, Y. M., & Foremsky, D. J. (1995). Interfacial fracture toughness of concrete repair materials. In Proceedings of the 2nd conference on fracture mechanics of concrete structures. Freiburg, Germany.
  23. Liu, I. S. T., Oehlers, D. J., & Seracino, R. (2007). Study of intermediate crack debonding in adhesively plated beams. Journal of Composites for Construction, 11(2), 175-183. https://doi.org/10.1061/(ASCE)1090-0268(2007)11:2(175)
  24. Obaidat, Y., Heyden, S., Dahlblom, O., Abu-Farsakh, G., & Abdel-Jawad, Y. (2011). Retrofitting of reinforced concrete beams using composite laminates. Construction and Building Materials, 25(2), 591-597. https://doi.org/10.1016/j.conbuildmat.2010.06.082
  25. Qiao, P., & Xu, Y. (2004). Evaluation of fracture energy of composite-concrete bonded interfaces using three-point bend tests. Journal of Composite Construction, 8(4), 352-359. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:4(352)
  26. Reinhardt, H. W. (1985). Crack softening zone in plain concrete under static loading. Cement and Concrete Research, 15(1), 42-52. https://doi.org/10.1016/0008-8846(85)90007-9
  27. Saxena, P., Toutanji, H., & Noumowe, A. (2008). Failure analysis of FRP-strengthened RC beams. Journal of Composites for Construction, 12(1), 2-14. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:1(2)
  28. Seracino, R., Saifulnaz, M. R. R., & Oehlers, D. J. (2007). Generic debonding resistance of EB and NSM plate-toconcrete joints. Journal of Composites for Construction, ASCE, 11(1), 62-70. https://doi.org/10.1061/(ASCE)1090-0268(2007)11:1(62)
  29. Spadea, G., Bencardino, F., Sorrenti, F., & Swamy, R. N. (2015). Structural effectiveness of FRP materials in strengthening RC beams. Engineering Structures, 99, 631-641. https://doi.org/10.1016/j.engstruct.2015.05.021
  30. Teng, J. G., Chen, J. F., Smith, S. T., & Lam, L. (2002). FRP strengthened RC structures. New York, NY: Wiley.
  31. Teng, J. G., Smith, S. T., Yao, J., & Chen, J. F. (2003). Intermediate crack-induced debonding in RC beams and slabs. Journal of Construction and Building Materials, 17(6-7), 447-462. https://doi.org/10.1016/S0950-0618(03)00043-6
  32. Ulm, F. J., & Coussy, O. (2001). Mechanics and durability of solids. Solid mechanics (Vol. I). Prentice Hall series on civil, environmental and systems engineering, Cambridge, MA.
  33. Yao, J., & Teng, J. G. (2007). Plate end debonding in FRPplated RC beams-I: experiments. Engineering Structures, 29, 2457-2471. https://doi.org/10.1016/j.engstruct.2006.11.022

Cited by

  1. Dual-Horizon Peridynamics Analysis of Debonding Failure in FRP-to-Concrete Bonded Joints vol.13, pp.1, 2019, https://doi.org/10.1186/s40069-018-0328-6