DOI QR코드

DOI QR Code

Nonlinear analysis of reinforced concrete beams strengthened with polymer composites

  • Pendhari, S.S. (Department of Civil Engineering, Indian Institute of Technology Bombay) ;
  • Kant, T. (Department of Civil Engineering, Indian Institute of Technology Bombay) ;
  • Desai, Y.M. (Department of Civil Engineering, Indian Institute of Technology Bombay)
  • 투고 : 2005.05.02
  • 심사 : 2006.04.25
  • 발행 : 2006.09.10

초록

Strengthening of existing old structures has traditionally been accomplished by using conventional materials and techniques, viz., externally bonded steel plates, steel or concrete jackets, etc. Alternatively, fibre reinforced polymer composite (FRPC) products started being used to overcome problems associated with conventional materials in the mid 1950s because of their favourable engineering properties. Effectiveness of FRPC materials has been demonstrated through extensive experimental research throughout the world in the last two decades. However there is a need to use refined analytical tools to simulate response of strengthened system. In this paper, an attempt has been made to develop a numerical model of strengthened reinforced concrete (RC) beams with FRPC laminates. Material models for RC beams strengthened with FRPC laminates are described and verified through a nonlinear finite element (FE) commercial code, with the help of available experimental data. Three dimensional (3D) FE analysis has been performed by assuming perfect bonding between concrete and FRPC laminate. A parametric study has also been performed to examine effects of various parameters like fibre type, stirrup's spacing, etc. on the strengthening system. Through numerical simulation, it has been shown that it is possible to predict accurately the flexural response of RC beams strengthened with FRPC laminates by selecting an appropriate material constitutive model. Comparisons are made between the available experimental results in literature and FE analysis results obtained by the present investigators using load-deflection and load-strain plots as well as ultimate load of the strengthened beams. Furthermore, evaluation of crack patterns from FE analysis and experimental failure modes are discussed at the end.

키워드

참고문헌

  1. ACI Committee 440. (I996), 'State-of-the-art report on fibre reinforced plastic (FRP) reinforcement for concrete structures', American Concrete Institute, Farmington Hills, Mich
  2. ACI Committee 440. (2002), 'Guide for the design and construction of externally bonded FRP system for strengthening concrete structures', American Concrete Institute, Farmington Hills, Mich
  3. Arduini, M. and Nanni, A. (1997), 'Parametric study of beams with externally bonded FRP reinforcement', ACI Struct. J, 94, 493-501
  4. Bazant, Z.P. and Oh, B.H. (1983), 'Crack band theory for fracture of concrete', RlLEM Materials and Structures, 16(93), 155-177
  5. Ferrier, E., Avril, S., Hamelin, P. and Vautrin, A. (2003), 'Mechanical behaviour of reinforced concrete beams reinforced by externally bonded CFRP sheets', RlLEM Materials and Structures, 36, 522-529 https://doi.org/10.1007/BF02480829
  6. Hibbitt, K and Sorensen, I. (2003), 'ABAQUS theory manual and user's manuals', Providence, ver 6.4.2: RI USA
  7. Kachlakev, D.L, Miller, T., Vim, S., Chansawat, K. and Potisuk, T.(1998), 'Strengthening of bridges using composite materials', FHWA-OR-RD-98-08, Oregon Department of Transportation, Salem, Oregon
  8. Liu, GR., Lam, KY and Tani, J. (1996), 'A new technique for analyzing the 3-D wave fields in anisotropic laminate excited by harmonic loads', JSME Int. J, 39(4), 679-686
  9. Lubliner, T., Oliver, l, Oller, S. and Onate, E. (1989), 'A plastic damage model for concrete', Int. J Solids Struct., 25(3), 299-326 https://doi.org/10.1016/0020-7683(89)90050-4
  10. Mander, J.B., Priestley, MJ.N. and Park, R. (1988), 'Theoretical stress-strain model for confined concrete', J Struct. Eng., ASCE, 114, 1804-1826 https://doi.org/10.1061/(ASCE)0733-9445(1988)114:8(1804)
  11. Pesic, N. and Pilakoutas, K (2005), 'Flexural analysis and design of reinforced concrete beams with externally bonded FRP reinforcement', RlLEM Materials and Structures, 38, 183-192 https://doi.org/10.1007/BF02479343
  12. Rahimi, H. and Hutchinson, A. (2001), 'Concrete beams strengthened with externally bonded FRP plates', J Composites for Construction, ASCE, 5(1), 44-56 https://doi.org/10.1061/(ASCE)1090-0268(2001)5:1(44)
  13. Ramana, V.P.V., Kant, T., Morton, S.E., Dutta, P.K., Mukherjee, A. and Desai, YM. (2000), 'Behaviour of CFRPC strengthened reinforced concrete beams with varying degree of strengthening', Composites: Part B, 31, 461-470 https://doi.org/10.1016/S1359-8368(00)00022-6
  14. Rashid, YR. (1968), 'Ultimate strength analysis of concrete pressure vessels', Nuclear Engineering and Design, 7(4), 334-344 https://doi.org/10.1016/0029-5493(68)90066-6
  15. Tedesco, J.W., Stalling, J.M. and El-Mihilmy, M. (1999), 'Finite element method analysis of a concrete bridge repaired with fibre reinforced plastic laminates', Comput. Struct., 72, 379-407 https://doi.org/10.1016/S0045-7949(99)00010-3
  16. Triantafillou, T.C. and Plevris, N. (1992), 'Strengthening of RC beams with epoxy bonded fibre composite materials', RlLEM Materials and Structures, 25, 201-211 https://doi.org/10.1007/BF02473064

피인용 문헌

  1. Freeze-thaw resistance of unidirectional-fiber-reinforced epoxy composites vol.123, pp.6, 2012, https://doi.org/10.1002/app.34870