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Behaviour of hybrid fibre reinforced concrete beams strengthened with GFRP laminates

  • Ibrahim, S. Syed (Department of Civil Engineering, Pondicherry Engineering College) ;
  • Eswari, S. (Department of Civil Engineering, Pondicherry Engineering College) ;
  • Sundararajan, T. (Department of Civil Engineering, Pondicherry Engineering College)
  • 투고 : 2016.05.31
  • 심사 : 2018.03.27
  • 발행 : 2018.06.10

초록

This study aims to investigate the flexural behaviour of glass fibre reinforced polymer (GFRP) laminated hybrid fibre reinforced concrete (HFRC) beams. The flexural and ductility performance of GFRP laminated HFRC beams having different proportions of polyolefin and steel fibres with 1.0% of total volume fraction were investigated. The parameters of this investigation included: load and deflection at first crack, yield, and ultimate stages, ductility and crack width. A total of seven beams of $150{\times}250mm$ in cross-section were tested in the laboratory over an effective span of 2800 mm. One reinforced concrete (RC) beam without any internal or external GFRP was taken as the reference beam. Of the remaining six beams, one beam was strengthened with GFRP, one beam with 100% steel fibres was strengthened with GFRP and four beams, each with different volume proportions of polyolefin and steel fibres (20:80, 30:70, 40:60, 50:50) were strengthened with GFRP. All the above beams were tested until failure. The experimental results show that a fibre volume proportion of 40:60 (polyolefin-steel) has significantly improved the overall performance of the tested beams.

키워드

참고문헌

  1. ACI 440-2R (2008), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, Michigan, U.S.A.
  2. Alfano, G., De Cicco, F. and Prota, A. (2012), "Intermediate debonding failure of RC beams retrofitted in flexure with FRP: experimental results versus prediction of codes of practice", J. Compos. Constr., 16(2), 185-195. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000250
  3. Almusallam, T.H., Elsanadedy, H.M. and Al-Salloum, Y.A. (2015), "Effect of longitudinal steel ratio on behavior of RC beams strengthened with FRP composites: Experimental and FE study", J. Compos. Constr., 19, 1-18.
  4. Barros, J.A.O., Lourenco, L.A.P., Soltanzadeh, F. and Taheri, M. (2013), "Steel fibre reinforced concrete for elements failing in bending and in shear", Adv. Concrete Constr., 1(1), 1-27. https://doi.org/10.12989/acc.2013.1.1.001
  5. Bsisu, K.A., Hunaiti, Y. and Younes, R. (2012), "Flexural ductility behavior of strengthened reinforced concrete beams using steel and CFRP plates", Jord. J. Civil Eng., 6(3), 304-312.
  6. CNR-DT204/2006 (2007), Guide for the Design and Construction of Fiber-Reinforced Concrete Structures, National Research Council, Rome.
  7. Eswari, S., Raghunath, P.N. and Suguna, K. (2008), "Ductility performance of hybrid fibre reinforced concrete", Am. J. Appl. Sci., 5(9), 1257-1262. https://doi.org/10.3844/ajassp.2008.1257.1262
  8. Ferrari, V.J. and Hanai, J.B.D. (2012), "Flexural strengthening of reinforced concrete beams with carbon fibres reinforced polymer (CFRP) sheet bonded to a transition layer of high performance cement-based composite", IBRACON Struct. Mater. J., 5(5), 596-626.
  9. Hashemi, S.H., Rahgozar, R. and Maghsoudi, A.A. (2009), "Flexural testing of high strength reinforced concrete beams strengthened with CFRP sheets", Int. J. Eng. Trans. B: Appl., 22(2), 131-146.
  10. Ibrahim, S.S., Eswari, S. and Sundararajan, T. (2015), "Experimental investigation on FRC beams strengthened with GFRP laminates", Electr. J. Struct. Eng., 15(1), 55-59.
  11. Ibrahim, S.S., Eswari, S. and Sundararajan, T. (2016), "Structural performance of glass fibre reinforced polymer laminated steel fibre reinforced concrete beams", Asian J. Civil Eng., 17(1), 73-80.
  12. IS (Indian Standard) (1959), Methods of Tests for Strength of Concrete, New Delhi, India.
  13. IS (Indian Standard) (1999), Method of Test Splitting Tensile Strength of Concrete, New Delhi, India.
  14. Kim, Y.J. and Harries, K.A. (2013), "Statistical characterization of reinforced concrete beams strengthened with FRP sheets", J. Compos. Constr., 17(3), 357-370. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000356
  15. Lenwari, A. and Thepchatri, T. (2009), "Experimental study on RC beams strengthened with carbon and glass fiber sheets", Eng. J., 13(2), 9-18. https://doi.org/10.4186/ej.2009.13.2.9
  16. Li, L., Guo, Y. and Liu, F. (2008), "Test analysis for FRC beams strengthened with externally bonded FRP sheets", Constr. Build. Mater., 22(3), 315-323. https://doi.org/10.1016/j.conbuildmat.2006.08.016
  17. Maalej, M. and Leong, K.S. (2005), "Engineered cementitious composites for effective FRP strengthening of RC beams", Compos. Sci. Technol., 65(7-8), 1120-1128. https://doi.org/10.1016/j.compscitech.2004.11.007
  18. Mahadik, S.A., Kamane, S.K. and Lande, A.C. (2014), "Effect of steel fibers on compressive and flexural strength of concrete", Int. J. Adv. Struct. Geotech. Engineering, 3(4), 388-392.
  19. Malhotra, S. and Chand, J. (2017), "Experimental investigation on high strength concrete with the addition of steel fiber", Int. J. Civil Eng. Technol., 8(7), 1130-1140.
  20. Qureshi, L.A., Sheikh, M.I. and Sultan, T. (2013), "Effect of mixing fiber cocktail on flexural strength of concrete", Proceedings of the 2nd International Conference on Rehabilitation and Maintenance in Civil Engineering, Procedia Engineering, 54, 711-719.
  21. Rosenboom, O. and Rizkalla, S.O. (2008), "Experimental study of intermediate crack debonding in fiber-reinforced polymer strengthened beams", ACI Struct. J., 105(1), 41-50.
  22. Sen, T. and Jagannatha, N.H.R. (2013), "Strengthening of RC beams in flexure using natural jute fibre textile reinforced composite system and its comparative study with CFRP and GFRP strengthening systems", Int. J. Sustain. Built Environ., 11(1), 1-15.
  23. Singh, A.P. and Singhal, D. (2011), "Permeability of steel fibre reinforced concrete influence of fibre parameters", Proceedings of the 12th East Asia-Pacific Conference on Structural Engineering and Construction, Procedia Engineering, 14, 2823-2829.
  24. Surinder, P.S. (2011), "Fatigue strength of hybrid steelpolypropylene fibrous concrete beams in flexure", Proceedings of the 12th East Asia-Pacific Conference on Structural Engineering and Construction, Procedia Engineering, 14, 2446-2452.
  25. Vijayakumar, A. and Babu, D.L.V. (2012), "Structural behavior of FRP wrapped beams under experimental investigation", Int. J. Earth Sci. Eng., 5(5), 1377-1383.
  26. Xiong, G.J., Yang, J.Z. and Ji, Z.B. (2004), "Behavior of reinforced concrete beams strengthened with externally bonded hybrid carbon fiber-glass fiber sheets", J. Compos. Constr., 8(3), 275-278. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:3(275)
  27. Yin. J. and Wu, Z.S. (2003), "Structural performances of short steel-fiber reinforced concrete beams with externally bonded FRP sheets", Constr. Build. Mater., 17(6-7), 463-470. https://doi.org/10.1016/S0950-0618(03)00044-8
  28. Zhan, Y. and Meschke, G. (2014), "Analytical model for the pullout behavior of straight and hooked-end steel fibers", J. Eng. Mech., 140(12), 1-13. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000641