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Repair, retrofitting and rehabilitation techniques for strengthening of reinforced concrete beams - A review

  • Ganesh, P. (AcSIR, CSIR-Structural Engineering Research Centre) ;
  • Murthy, A. Ramachandra (CSIR- Structural Engineering Research Centre)
  • Received : 2019.03.03
  • Accepted : 2019.04.29
  • Published : 2019.10.25
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Abstract

Structural strengthening of reinforced concrete (RC) beams is becoming essential to meet the up-gradation of existing structures due to the infrastructure development. Strengthening is also essential for damaged structural element due to the adverse environmental condition and other distressing factors. This article reviews the state of the field on repair, retrofitting and rehabilitation techniques for the strengthening of RC beams. Strengthening of RC beams using various promising techniques such as externally bonded steel plates, concrete jacketing, fibre reinforced laminates or sheets, external prestressing/external bar reinforcement technique and ultra-high performance concrete overlay have been extensively investigated for the past four decades. The primary objective of this article is to discuss investigations on various strengthening techniques over the years. Various parameters that have been discussed include the flexural capacity, shear strength, failure modes of various strengthening techniques and advances in techniques over the years. Firstly, background information on strengthening, including repair, retrofitting, and rehabilitation of RC beams is provided. Secondly, the existing strengthening techniques for reinforced concrete beams are discussed. Finally, the relative comparisons and limitations in the existing techniques are presented.

Keywords

References

  1. Adhikary, B.B. and Mutsuyoshi, H. (2002), "Numerical simulation of steel-plate strengthened concrete beam by a non-linear finite element method model", Constr. Build. Mater., 16, 291-301. https://doi.org/10.1016/S0950-0618(02)00022-3
  2. Adhikary, B.B. and Mutsuyoshi, H. (2006), "Shear strengthening of RC beams with web-bonded continuous steel plates", Constr. Build. Mater., 20, 296-307. https://doi.org/10.1016/j.conbuildmat.2005.01.026
  3. Adhikary, B.B., Mutsuyoshi, H. and Sano, M. (2000), "Shear strengthening of reinforced concrete beams using steel plates bonded on beam web: experiments and analysis", Constr. Build. Mater., 14(5), 237-244. https://doi.org/10.1016/S0950-0618(00)00023-4
  4. Aidoo, J., Harries, K.A. and Petrou, M.F. (2004), "Fatigue Behaviour of CFRP Strengthened Reinforced Concrete Bridge Girders", J. Compos. Constr., ASCE, 7(6), 501-518.
  5. Alaee, F.J. and Karihaloo, B.L. (2003a), "Fracture model for flexural failure of beams retrofitted with CARDIFRC", J. Eng. Mech., 129, 10-28.
  6. Alaee, F.J. and Karihaloo, B.L. (2003b), "Retrofitting of reinforced concrete neams with CARDIFRC", J. Compos. Constr., 7, 174-186. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:3(174)
  7. Alexander, J.G.S. (1996), "Shear strengthening of small scale concrete beams with carbon fibre reinforced plastic sheets", Proceedings of the 1st Structural Specialty Conference on Canadian Society for Civil Engineering, Edmonton, Alberta, Canada, May-June.
  8. Allen, R.T.L., Edwards, S.C. and Shaw, D.N. (1992), Repair of Concrete Structures, Taylor & Francis.
  9. Altun, F. (2004), "An experimental study of the jacketed reinforced-concrete beams under bending", Constr. Build. Mater., 18, 611-618. https://doi.org/10.1016/j.conbuildmat.2004.04.005
  10. American Concrete Institute (ACI) (1993), Causes, Evaluation and Repair of Cracks in Concrete Structures, ACI Committee 224.1R-93, Farmington Hills (MI), ACI.
  11. American Concrete Institute (ACI) (2008), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, ACI Committee 440.2R-08. Farmington Hills (MI), ACI.
  12. American Concrete Institute (ACI). (1992), Guide for the Use of Preplaced Aggregate Concrete for Structural and Mass Concrete Applications, ACI Committee 304, ACI Manual of Concrete Practice, Part 3, Detroit, Mich.
  13. An, W., Saadatmanesh, H. and Ehsani, M.R. (1991), "RC beams strengthened with FRP plates. 2: Analysis and parametric study", J. Struct. Eng., 117(11), 3434-3455. https://doi.org/10.1061/(ASCE)0733-9445(1991)117:11(3434)
  14. Aravind, N., Samanta, A.K., Thanikal, J.V. and Roy, D.S. (2017), "An experimental study on the effectiveness of externally bonded corrugated GFRP laminates for flexural cracks of RC beams", Constr. Build. Mater., 136, 348-360. https://doi.org/10.1016/j.conbuildmat.2017.01.047
  15. Aslam, M., Shafigh, P., Jummat, M.Z. and Shah, S.N.R. (2015), "Strengthening of RC beams using prestressed fiber reinforced polymers - A review", Constr. Build. Mater., 82, 235-256. https://doi.org/10.1016/j.conbuildmat.2015.02.051
  16. Azam, R., Soudki, K., West, J.S. and Noel, M. (2017), "Strengthening of shear-critical RC beams: Alternatives to externally bonded CFRP sheets", Constr. Build. Mater., 151, 494-503. https://doi.org/10.1016/j.conbuildmat.2017.06.106
  17. Barnes, A.R. and Mays, C.G. (1999), "Fatigue Performance of Concrete Beams Strengthened with CFRP Plates", J. Compos. Constr., ASCE, 3(2), 63-72. https://doi.org/10.1061/(ASCE)1090-0268(1999)3:2(63)
  18. Barnes, B.A., Baglin, P.S., Mays, G.C. and Subedi, N.K. (2001), "External steel plate systems for the shear strengthening of reinforced concrete beams", Eng. Struct., 23, 1162-1176. https://doi.org/10.1016/S0141-0296(00)00124-3
  19. Benyahia, A. and Ghrici, M. (2018), "Behaviour of self compacting repair mortars based on natural pozzolana in hot climate", Adv. Concr. Constr., 6(3), 285-296. https://doi.org/10.12989/ACC.2018.6.3.285
  20. Bhattacharjee, J. (2016), "Repair, rehabilitation & retrofitting of RCC for sustainable development with case studies", Civil Eng. Urban Plan.: Int. J., 3, 33-47.
  21. Bruhwiler, E. and Denarie, E. (2008), "Rehabilitation of concrete structures using ultra-high performance fibre reinforced concrete", Proceedings of the Second International Symposium on Ultra High Performance Concrete, Kassel, Germany.
  22. Cairns, J. and Rafeeqi, S.F.A. (1997), "Behaviour of reinforced concrete beams strengthened by external unbonded reinforcement", Constr. Build. Mater., 11(5-6), 309-317. https://doi.org/10.1016/S0950-0618(97)00052-4
  23. Cairns, J. and Rafeeqi, S.F.A. (2002), "Analysis of reinforced concrete beams strengthened by external unbonded bars", Mag. Concrete Res., 54(2), 141-153. https://doi.org/10.1680/macr.2002.54.2.141
  24. Cairns, J. and Rafeeqi, S.F.A. (2003), "Strengthening reinforced concrete beams with external unbonded bars: Experimental investigation", Proceedings of the Institution of Civil Engineers, Structures & Buildings, 156, 27-37. https://doi.org/10.1680/stbu.2003.156.1.27
  25. Cairns, J. and Watson, D. (1993), "Structural aspects of concrete repairs: behavior of beams with exposed reinforcement", Proceedings of the 4th International Conference on Deterioration & Repairs of Reinforced Concrete in the Arabian Gulf, Bahrain.
  26. Cairns, J. and Zhao, Z. (1993), "Structural behavior of concrete beams with reinforcement exposed", Proceedings of the Inst. Civil Eng.: Struct. Build., 99, 141-154. https://doi.org/10.1680/istbu.1993.23373
  27. Central Public Works Department (2011), Hand Book on "Repairs and Rehabilitation of RCC Buildings, CPWD, Govt. of India, New Delhi.
  28. Chaallal, O., Nollet, M.J. and Perraton, D. (1998), "Strengthening of reinforced concrete beams with externally bonded fibrereinforced-plastic plates: Design guidelines for shear and flexure", Can. J. Civil Eng., 25(4), 692-704. https://doi.org/10.1139/l98-008
  29. Chajes, M.J., Thomson, T.A., Januszka, T.F. and Finch, W. (1994), "Flexural strengthening of concrete beams using externally bonded composite materials", Constr. Build. Mater., 8(3), 191-201. https://doi.org/10.1016/S0950-0618(09)90034-4
  30. Chakrabortty, A. and Khennane, A. (2014), "Failure mechanisms of hybrid FRP-concrete beams with external filament-wound wrapping", Adv. Concr. Constr., 2(1), 57-75. https://doi.org/10.12989/acc.2014.2.1.057
  31. Chalioris, C.E., Thermou, G.E. and Pantazopoulou, S.J. (2014), "Behaviour of rehabilitated RC beams with self-compacting concrete jacketing - Analytical model and test results", Constr. Build. Mater., 55, 257-273. https://doi.org/10.1016/j.conbuildmat.2014.01.031
  32. Chen, J.F. and Teng, J.G. (2003), "Shear capacity of FRP strengthened RC beams: FRP debonding", Constr. Build. Mater., 17(1), 27-41. https://doi.org/10.1016/S0950-0618(02)00091-0
  33. 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), 784-91. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:7(784)
  34. Chen, W., Pham, T.M., Sichembe, H., Chen, L. and Hao, H. (2018), "Experimental study of flexural behaviour of RC beams strengthened by longitudinal and U-shaped basalt FRP sheet", Compos. Part-B Eng., 134, 114-126. https://doi.org/10.1016/j.compositesb.2017.09.053
  35. Cheong, H.K. and MacAlevey, N. (2000). "Experimental behaviour of jacketed reinforced concrete beams", J. Struct. Eng., 126(6), 692-699. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:6(692)
  36. Dave, U.V. and Trambadia, K.H. (2004), "Behavior of prestressed concrete beams using GFRP wrapping", J. Compos. Constru., 10(1). http://www.nbmcw.com/articles/concrete/314-behaviorof-prestressed-concrete-beams-using-gfrp-wrapping.html.
  37. Davis, B.L. and Powell, J. (1984), "Strengthening of Brinsworth Rad Bridge, Rotherham, IABSE", 12th Congress, Vancouver, BC, 401-407.
  38. Diab, Y.G. (1998), "Strengthening of RC beams by using sprayed concrete experimental approach", Eng. Struct., 20, 631-643. https://doi.org/10.1016/S0141-0296(97)00044-8
  39. Diagana, C., Li, A. Gedalia, B. and Delmas, Y. (2003), "Shear strengthening effectiveness with CFF strips", Eng. Struct., 25, 507-516. https://doi.org/10.1016/S0141-0296(02)00208-0
  40. Dias, S.J.E., Barros, J.A.O. and Janwaen, W. (2018), "Behavior of RC beams flexurally strengthened with NSM CFRP laminates", Compos. Struct., 201, 363-376. https://doi.org/10.1016/j.compstruct.2018.05.126
  41. Dong, J., Wang, Q. and Guan, Z. (2013), "Structural behaviour of RC beams with external flexural and flexural-shear strengthening by FRP sheets", Compos. Part-B Eng., 44, 604-612. https://doi.org/10.1016/j.compositesb.2012.02.018
  42. Duthinh, D. and Starnes, M. (2001), Strengthening of Reinforced Concrete Beams with Carbon FRP, Eds. Figueiras et al., Composites in Constructions.
  43. El-Ghandour, A.A. (2011), "Experimental and analytical investigation of CFRP flexural and shear strengthening efficiency of RC beams", Constr. Build. Mater., 25, 1419-1429. https://doi.org/10.1016/j.conbuildmat.2010.09.001
  44. El-shafie, A.H (2014), "Shear strengthening of reinforced concrete beams with rectangular web openings by FRP Composites", Adv. Concr. Constr., 3(2), 281-300.
  45. Engindeniz, M. (2008), "Repair and strengthening of Pre-1970 reinforced concrete corner beam-column joints using CFRP composites", ProQuest, http://hdl.handle.net/1853/24808.
  46. Esfahani, M.R., Kianoush, M.R. and Tajari, A.R. (2007), "Flexural behaviour of reinforced concrete beams strengthened by CFRP sheets", Eng. Struct., 29, 2428-2444. https://doi.org/10.1016/j.engstruct.2006.12.008
  47. Farhat, F.A., Nicolaides, D., Kanellopoulos, A. and Karihaloo, B.L. (2007), "High performance fibre-reinforced cementitious composite (CARDIFRC)-Performance and application to retrofitting", Eng. Fract. Mech., 74, 151-167. https://doi.org/10.1016/j.engfracmech.2006.01.023
  48. Fayyadh, M.M. and Razak, H.A. (2012), "Assessment of effectiveness of CFRP repaired RC beams under different damage levels based on flexural stiffness", Constr. Build. Mater., 37, 125-134. https://doi.org/10.1016/j.conbuildmat.2012.07.021
  49. Ferrier, E., Bigaud, D., Clement, J.C. and Hamelin, P. (2011), "Fatigue-loading effect on RC beams strengthened with externally bonded FRP", Constr. Build. Mater., 25, 539-546. https://doi.org/10.1016/j.conbuildmat.2010.07.035
  50. Frederick, F.F.R., Sharma, U.K. and Gupta, V.K. (2015), "Effect of end anchorage in external CFRP confinement on shear damaged RC beams", Procedia Eng., 125, 963-958.
  51. Garden, H.N., Hollaway, L.C. and Thorne, A.M. (1998), "The strengthening and deformation behaviour of reinforced concrete beams upgraded using prestressed composite plates", Mater. Struct., 31, 247-258. https://doi.org/10.1007/BF02480423
  52. Gemert, V.D.A. (1981), "Repairing of concrete structures by externally bonded steel plates", Proceedings of the ICP/RILEM/IBK International Symposium on Plastics in Material and Structural Engineering, 519-526.
  53. Ghaleb, B.M. (1992), "Strengthening of damaged reinforced concrete beams by external fiber glass plates", Thesis, King Fahd University of Petroleum and Minerals, Saudi Arabia.
  54. Gheorghiu, C., Labossiere, P. and Proulx, J. (2006), "Fatigue and monotonic strength of RC beams strengthened with CFRPs", Compos. Part A Appl. Sci. Manuf., 37, 1111-1118. https://doi.org/10.1016/j.compositesa.2005.05.035
  55. Gulsan, M.E., Al-Jawahery, M.S., Alshawaf, A.H., Hussein, T.A., Abdulhaleem, K.N. and Cevik, A. (2018), "Rehabilitation of normal and self-compacted steel fiber reinforced concrete corbels via basalt fiber", Adv. Concr. Constr., 6(5), 423-463. https://doi.org/10.12989/ACC.2018.6.5.423
  56. Hammad, A., Rashid, H., Muhammad, R.R. and Asad, A.G. (2018), "Strengthening of concrete damaged by mechanical loading and elevated temperature", Adv. Concr. Constr., 6(6), 645-658. https://doi.org/10.12989/ACC.2018.6.6.645
  57. Harajli, M.H. (1993), "Strengthening of concrete beams by external prestressing", PCI J., 38(6), 76-88. https://doi.org/10.15554/pcij.11011993.76.88
  58. Hussain, M., Sharif, A., Basunbul, I.A., Baluch, M.H. and Al-Sulaimani, G.J (1995), "Flexural behavior of precracked reinforced concrete beams strengthened externally by steel plates", ACI Struct. J., 92(1), 14-22.
  59. International Federation for Structural Concrete (fib) (2001), Externally Bonded FRP Reinforcement for RC Structures, FIB bulletin No. 14, Lausanne, Switzerland
  60. Jones, R., Swamy, R.N. and Ang, T.H. (1982), "Under and over reinforced concrete beams with glued steel plates", Int. J. Cement Compos. Lightwt. Concrete, 4(1), 19-32. https://doi.org/10.1016/0262-5075(82)90004-5
  61. Jones, R., Swamy, R.N. and Charif, A. (1988), "Plate separation and anchorage of reinforced concrete beams strengthened by epoxy bonded steel plates", Struct. Eng., 66(5), 85-94.
  62. Jones, R., Swamy, R.N., Bloxham, J. and Bouderbalah, A. (1980), "Composite behaviour of concrete beams with epoxy bonded external reinforcement", Int. J. Cement Compos. Lightwt. Concrete, 2(2), 91-107.
  63. Julio, E.N.B.S., Fernando, A.B.B. and Vitor, D.S. (2005), "Reinforced concrete jacketing-interface influence on monotonic loading response", ACI Struct. J., 102(2), 252-257.
  64. Jumaat, M.Z., Kabir, M.H. and Obaydullah, M. (2006), "A review of the repair of reinforced concrete beams", J. Appl. Sci. Res., 2(6), 317-326.
  65. Karam, G.N. (1992), "Optimal design for prestressing with FRP sheets in structural members", Proceedings of the First International Conference on Advanced Composite Materials in Bridges and Structures, Sherbrooke, Canada.
  66. Khalifa, A. and Nanni, A. (2000), "Improving shear capacity of existing RC T-section beams using CFRP composites", Cement Concrete Compos., 22, 165-174. https://doi.org/10.1016/S0958-9465(99)00051-7
  67. Khalifa, A.M. (2016), "Flexural performance of RC beams strengthened with near surface mounted CFRP strips", Alexandria Eng. J., 55, 1497-1505. https://doi.org/10.1016/j.aej.2016.01.033
  68. Khalil, H.S., Soliman, H.S., Sallam, H.E.M. and Shaheen, H.H. (2008), "Flexural strengthening of reinforced concrete beams using external unbonded steel bars", Eng. Res. J., 31(4), 407-412.
  69. Kim, Y.J. and Heffernan, P.J. (2008), "Fatigue behavior of externally strengthened concrete beams with fiber-reinforced polymers: State of the art", J. Compos. Constr., 12(3), 246-256. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:3(246)
  70. Krstulov, N. and Toutanj, H. (1996), "Infrastructural repair and retrofit with HPFRCCs", Proceedings of the Second International Workshop on High Performance Fibre Reinforced Cement Composites, Ann Arbor, USA.
  71. Kyriaki, G.S., Mistakidis, E. and Stylianidis, K.A. (2013), "Simulation of experiments on RC frames strengthened with dissipative steel links", Adv. Concr. Constr., 3(2), 253-272.
  72. L'Hermite, R. and Bresson, J. (1967), "Concrete reinforced with glued plates", RILEM International Symposium, Synthetic Resins in Building Construction, Paris, 175-203.
  73. Lamanna, A.J., Bank, L.C., Borowicz, D.T. and Arora, D. (2012), "Strengthening of concrete beams with mechanically Fastened FRP strips", Available: http://www.quakewrap.com/frp%20papers/Strengthening-Of-Concrete-Beams-With-Mechanically-Fastened-FRP-Strips.pdf.
  74. Lee, M.G., Kan, Y.C. and Chen, K.C. (2006), "A preliminary study of RPC for repair and retrofitting materials", J. Chin. Inst. Eng., 29(6), 1099-1103. https://doi.org/10.1080/02533839.2006.9671209
  75. Lee, M.G., Wang, Y.C. and Chiu, C.T. (2007), "A preliminary study of reactive powder concrete as a new repair material", Constr. Build. Mater., 21(1), 182-189. https://doi.org/10.1016/j.conbuildmat.2005.06.024
  76. Li, L.Z., Jiang, C.J. and Su, R.K.L. (2015), "Simplified flexural design of bolted side-plated beams with partial interaction", Proceedings of the 6th International Conference on Advances in Experimental Structural Engineering, University of Illinois, Urbana-Champaign, United States, August.
  77. Li, L.Z., Lo, S.H. and Su, R.K.L. (2013), "Experimental study of moderately reinforced concrete beams strengthened with boltedside steel plates", Adv. Struct. Eng., 16(3), 499-516. https://doi.org/10.1260/1369-4332.16.3.499
  78. Mahal, M., Taljsten, B. and Blanksvard, T. (2016), "Experimental performance of RC beams strengthened with FRP materials under monotonic and fatigue loads", Constr. Build. Mater., 122, 126-139. https://doi.org/10.1016/j.conbuildmat.2016.06.060
  79. Marijana, H.N., Naida, A., Gordana, P. and Tanja, K.S. (2018), "Strengthening techniques for masonry structures of cultural heritage according to recent Croatian provisions", Earthq. Struct., 15(5), 473-485. https://doi.org/10.12989/EAS.2018.15.5.473
  80. Meier, U. (1987), "Bridge repair with high performance composite materials", Mater. Technik, 15, 125-128.
  81. Meier, U. and Kaiser, H. (1991), "Strengthening of structures with CFRP laminates", Proc. Advanced Composite Materials in Civil Engineering Structures, ASCE, Las Vegas, Nevada, 224-232.
  82. Mesbah, H. and Benzaid, R. (2017), "Damage-based stress-strain model of RC cylinders wrapped with CFRP composites", Adv. Concr. Constr., 5(5), 539-561. https://doi.org/10.12989/acc.2017.5.5.539
  83. Murthy, A.R.C., Aravindan, M. and Ganesh, P. (2018b), "Prediction of flexural behaviour of RC beams strengthened with ultra-high performance fiber reinforced concrete", Struct. Eng. Mech., 65(3), 315-325. https://doi.org/10.12989/sem.2018.65.3.315
  84. Murthy, A.R.C., Karihaloo, B.L. and Priya, D.S. (2018a), "Flexural behavior of RC beams retrofitted with ultra-high strength concrete", Constr. Build. Mater., 175, 815-824. https://doi.org/10.1016/j.conbuildmat.2018.04.174
  85. Murthy, A.R.C., Karihaloo, B.L., Rani, P.V. and Priya, D.S. (2018c), "Fatigue behaviour of damaged RC beams strengthened with ultra high performance fibre reinforced concrete", Int. J. Fatig., 116, 659-668. https://doi.org/10.1016/j.ijfatigue.2018.06.046
  86. Oehlers, D.J. (2001), "Development of design rules for retrofitting by adhesive bonding or bolting either FRP or Steel plates to RC beams or slabs in bridges and buildings", Compos. Part A, 32, 1345-1355. https://doi.org/10.1016/S1359-835X(01)00089-6
  87. Oesterlee, C., Denarie, E. and Bruhwiler, E. (2007), "In-situ casting of UHPFRC protection layer on crash barrier walls", Proc. Adv. Constr. Mater., 21(1), 182-189.
  88. Oudah, F. and El-Hacha, R. (2013), "Research progress on the fatigue performance of RC beams strengthened in flexure using Fiber Reinforced Polymers", Compos. Part B Eng., 47, 82-95. https://doi.org/10.1016/j.compositesb.2012.09.057
  89. Papakonstantinou, C.G., Petrou, M.F. and Harries, K.A. (2001), "Fatigue of reinforced concrete beams strengthened with GFRP sheets", J. Compos. Const., ASCE, 5(4), 246-253. https://doi.org/10.1061/(ASCE)1090-0268(2001)5:4(246)
  90. Parkinson, J. (1978), "Glue solves a sticky problem for Gestetner", New Civil Eng., 14, 26-27.
  91. Peng, H., Zhang, J., Shang, S., Liu, Y. and Cai, C.S. (2016), "Experimental study of flexural fatigue performance of reinforced concrete beams strengthened with prestressed CFRP plates", Eng. Struct., 127, 62-72. https://doi.org/10.1016/j.engstruct.2016.08.026
  92. Prem, P.R. and Murthy, A.R.C. (2016), "Acoustic emission and flexural behaviour of RC beams strengthened with UHPC overlay", Constr. Build. Mater., 123, 481-492. https://doi.org/10.1016/j.conbuildmat.2016.07.033
  93. Prem, P.R., Murthy, A.R.C., Gopal, R. and Bharathkumar, B.H. (2014), "Flexural behaviour of damaged RC beams strengthened with ultra-high performance concrete", Adv. Struct. Eng., 2057-2069.
  94. Quattlebaum, J., Harries, K.A. and Petrou, M.F. (2005), "Comparison of three CFRP flexural retrofit systems under monotonic and fatigue loads", J. Bridge Eng., ASCE, 10(6), 731-740. https://doi.org/10.1061/(ASCE)1084-0702(2005)10:6(731)
  95. Raghavachary, S. (1992), "Experimental studies on flexural behavior of CFRP retro fired concrete members", Thesis, Florida Atlantic University, Florida.
  96. Raval, S.S. and Dave, U.V. (2013), "Effectiveness of various methods of jacketing for RC beams", Procedia Eng., 51, 230-239. https://doi.org/10.1016/j.proeng.2013.01.032
  97. Razavi, S.V., Jumaat, M.Z., El-Shafie, A.H. and Ronagh, H.R. (2015), "Load-deflection analysis prediction of CFRP strengthened RC slab using RNN", Adv. Concr. Constr., 3(2), 91-102. https://doi.org/10.12989/acc.2015.3.2.091
  98. Richard, P. and Cheyrezy, M.H. (1994), "Reactive powder concretes with high ductility and 200-800 MPa compressive strength", ACI SP144-24, 144, 507-518.
  99. Richard, P. and Cheyrezy, M.H. (1995), "Composition of reactive powder concretes", Cement Concrete Res., 25, 1501-1511. https://doi.org/10.1016/0008-8846(95)00144-2
  100. Ritchie, P.A. (1988), "External reinforcement of concrete beams using fiber reinforced plastic", Thesis, Leigh University.
  101. Ritchie, P.A., Thomas, D.A., Lu, L.W. and Conelly, G.M. (1991), "External reinforcement of concrete beams using fiber reinforced plastics", ACI Struct. J., 88, 490-500.
  102. Ross, C.A., Jerome, D.M., Tedesco, J.W. and Hughes, M.L. (1994), "Strengthening of reinforced concrete beams with externally bonded composite laminates", ACI Struct. J., 96(3), 212-220.
  103. Saadatmanesh, H. and Ehsani, M.R. (1990). "Fiber composite plates can strengthen beams", Concrete Int., 12(3), 65-71.
  104. SAMARIS (2005), Report D22, "Full scale application of UHPFRC for the rehabilitation of bridges - from the lab to the field", European Project 5th FWP / SAMARIS - Sustainable and Advanced MAterials for Road Infrastructures-WP 14: HPFRCC, http://samaris.zag.si/.
  105. Shahawy, M. and Beitelman, E.T. (1999), "Static and fatigue performance of RC beams strengthened with CFRP laminates", J. Struct. Eng., ASCE, 125(6), 613-621. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:6(613)
  106. Sharif, A.M., Al-Sulaimani, G.J. and Hussain, M. (1995), "Strengthening of shear damaged RC beams by external plate bonding of steel plates", Mag. Concrete Res., 47(173), 329-334. https://doi.org/10.1680/macr.1995.47.173.329
  107. Shehata, I.A.E.M., Shehata, L.C.D, Santos, E.W.F. and Simoes, M.L.F. (2009), "Strengthening of reinforced concrete beams in flexure by partial jacketing", Mater. Struct., 42, 495-504. https://doi.org/10.1617/s11527-008-9397-3
  108. Sheikh, S.A. (2002), "Performance of concrete structures retrofitted with fibre reinforced polymers", Eng. Struct., 24, 869-879. https://doi.org/10.1016/S0141-0296(02)00025-1
  109. Shin, K.J., Lim, J.H., Oh, Y.S. and Moon, J.H. (2007), "An experimental study on the flexural behavior of RC beams strengthened with high-strength bars", Mag. Concrete Res., 59(7), 469-481. https://doi.org/10.1680/macr.2007.59.7.469
  110. Soheil, E. and Javad, E. (2016), "Simulation of the behaviour of RC columns strengthen with CFRP under rapid loading", Adv. Concr. Constr., 4(4), 319-332. https://doi.org/10.12989/acc.2016.4.4.319
  111. Su R.K.L. and Zhu Y. (2005), "Experimental and numerical studies of external steel plate strengthened reinforced concrete coupling beams", Eng. Struct., 27, 1537-1550. https://doi.org/10.1016/j.engstruct.2005.04.012
  112. Su, R.K.L. and Siu, W.H. (2007), "Nonlinear response of bolt groups under in-plane loading", Eng. Struct., 29(4), 626-634. https://doi.org/10.1016/j.engstruct.2006.06.003
  113. Su, R.K.L., Siu, W.H. and Smith, S.T. (2010), "Effects of boltplate arrangements on steel plate strengthened reinforced concrete beams", Eng. Struct., 32, 1769-1778. https://doi.org/10.1016/j.engstruct.2010.02.028
  114. Subedi, N.K. and Baglin, P.S. (1998), "External plate reinforcement for concrete beams", J. Struct. Eng., ASCE, 124(12), 1490-1495. https://doi.org/10.1061/(ASCE)0733-9445(1998)124:12(1490)
  115. Swamy, R.N., Jones, R. and Charif, A. (1989), "The effect of external plate reinforcement on the strengthening of structurally damaged RC beams", Struct. Eng., 67(3), 45-56.
  116. Swamy, R.N., Jones, R. and Charif, A. (1996), "Contribution of externally bonded steel plate reinforcement to the shear resistance of reinforced concrete beams", ACI SP, 165, 1-24.
  117. Taerwe, L. (1995), "Non-metallic (FRP) reinforcement for concrete structures", Proceedings of the Second International RILEM Symposium (FRPRCS-2), E&FN Spon, London, UK, ISBN 0 41920540 3.
  118. Tahsiri, H., Sedehi, O., Khaloo, A. and Raisi, E.M. (2015), "Experimental study of RC jacketed and CFRP strengthened RC beams", Constr. Build. Mater., 95, 476-485. https://doi.org/10.1016/j.conbuildmat.2015.07.161
  119. Thermou, G.E., Pantazopoulou, S.J. and Elnashai, A.S. (2007), "Flexural behavior of brittle RC members rehabilitated with concrete jacketing" J. Struct. Eng., 133(10), 1373-1384. https://doi.org/10.1061/(ASCE)0733-9445(2007)133:10(1373)
  120. Triantafillou, R.C. and Plevris, N. (1992), "Strengthening of RC beams with epoxy-bonded fibercomposite materials", Mater. Struct., 25, 201-211. https://doi.org/10.1007/BF02473064
  121. Triantafillou, T.C. and Deskovic, N. (1991), "Innovative prestressing with FRP sheets: Mechanics of short term behaviour", J. Eng. Mech., 117(7), 1652-1672. https://doi.org/10.1061/(ASCE)0733-9399(1991)117:7(1652)
  122. Tsioulou, O.T., Lampropoulos, A.P. and Dritsos, A.E. (2013), "Experimental investigation of interface behaviour of RC beams strengthened with concrete layers", Constr. Build. Mater., 40, 50-59. https://doi.org/10.1016/j.conbuildmat.2012.09.093
  123. Uji, K. (1992), "Improving shear capacity of existing reinforced concrete members by applying carbon fibre sheets", Tran. JPN Concrete Inst., 14, 253-266.
  124. Upreti, G., Murthy, A.R.C., Smitha, G., Iyer, N.R. and Venkat, L. (2016), "Strength and ductility of RC beams strengthened with ultra high strength cementitious composite overlay", J. Struct. Eng. (JOSE-Madras), 43(2), 190-198.
  125. Varastehpour, H. and Hamelin, P. (1997), "Strengthening of concrete beams using fiber reinforced plastics", Mater. Struct., 30, 160-166. https://doi.org/10.1007/BF02486388
  126. Varghese, P.C. (2014), Maintenance, Repair & Rehabilitation & Minor Works of Buildings, PHI Learning Pvt. Ltd.
  127. Vasudevan, G. and Kothandaraman, S. (2014), "Experimental investigation on the performance of RC beams strengthened with external bars at soffit", Mater. Struct., 47, 1617-1631. https://doi.org/10.1617/s11527-013-0141-2
  128. Vesmawala, G. and Pradeep, K. (2017). "Investigation of GFRP strengthened RC non-slender columns under eccentric Loading", Gradjevinar, 69(9), 831-840.
  129. Voo, Y.L., Augustin, P.C. and Thamboe, T.A.J. (2011), "Construction and Design of a 50M Single Span UHP Ductile Concrete Composite Road Bridge", Struct. Eng., 89, 24-31.
  130. Wang, J.H. (2018), Lifecycle Cost and Performance Analysis for Repair of Concrete Tunnels, Eco-Efficient Repair and Rehabilitation of Concrete Infrastructures, 1st Edition, Chapter: 23, Woodhead Publishing.
  131. Wang, L. and Su, R.K.L. (2013), "A unified design procedure for preloaded rectangular RC columns strengthened with postcompressed plates", Adv. Concr. Constr., 1(2), 163-185. https://doi.org/10.12989/acc.2013.01.2.163
  132. Wang, Y.C., Lee, M.G. and Chen, B.C. (2007), "Experimental study of FRP-strengthened RC bridge girders subjected to fatigue loading", Compos. Struct., 81, 491-498. https://doi.org/10.1016/j.compstruct.2006.09.012
  133. Xu, S.L., Wang, N. and Zhang, X.F. (2012), "Flexural behavior of plain concrete beams strengthened with ultra-high toughness cementitious composites layer", Mater. Struct., 45, 851-859. https://doi.org/10.1617/s11527-011-9803-0
  134. Yaman, S.T. (2016), "Behaviour of precast concrete beams prestressed with CFRP strands", Gradjevinar, 68(10), 775-786.
  135. Yang, D., Park, S. and Neale, K.W. (2009), "Flexural behaviour of reinforced concrete beams strengthened with prestressed carbon composites", Compos. Struct., 88, 497-508. https://doi.org/10.1016/j.compstruct.2008.05.016
  136. Ziraba, N., Baluch, M.H., Basunbul, I.A., Sharif, A., Azad, A.K. and Al-Sulaimani, G.J. (1994), "Guidelines towards the design of RC beams with external plates", ACI Struct. J., 91(6), 639-646.