DOI QR코드

DOI QR Code

An innovative solution for strengthening of old R/C structures and for improving the FRP strengthening method

  • Tsonos, Alexander G. (Department of Civil Engineering, Aristotle University of Thessaloniki)
  • 투고 : 2014.05.30
  • 심사 : 2014.08.30
  • 발행 : 2014.09.25

초록

In this study a new innovative method of earthquake-resistant strengthening of reinforced concrete structures is presented for the first time. Strengthening according to this new method consists of the construction of steel fiber ultra-high-strength concrete jackets without conventional reinforcement which is usually applied in the construction of conventional reinforced concrete jackets. An innovative solution is proposed also for the first time that ensures a satisfactory seismic performance of existing reinforced concrete structures, strengthened by using composite materials. The weak point of the use of such materials in repairing and strengthening of old R/C structures is the area of beam-column joints. According to the proposed solution, the joints can be strengthened with a steel fiber ultra-high-strength concrete jacket, while strengthening of columns can be achieved by using CFRPs. The experimental results showed that the performance of the subassemblage strengthened with the proposed mixed solution was much better than that of the subassemblage retrofitted completely with CFRPs.

키워드

참고문헌

  1. ACI-ASCE Committee 352-02 (2002), "Recommendations for design of beam-column joints in monolithic reinforced concrete structures (ACI 352R-02)", Am. Concrete Inst., 37.
  2. Chalioris, C.E. (2007), "Analytical Model for the Torsional Behaviour of Reinforced Concrete Beams Retrofitted with FRP Materials", Eng. Struct., 29(12), 3263-3276. https://doi.org/10.1016/j.engstruct.2007.09.009
  3. Chalioris, C.E. (2008), "Torsional strengthening of rectangular and flanged beams using carbon fibre-reinforced-polymers - experimental study", Constr. Build. Mater., 22(1), 21-29. https://doi.org/10.1016/j.conbuildmat.2006.09.003
  4. Chalioris, C.E. and Karayannis, C.G. (2009), "Effectiveness of the use of steel fibres on the torsional behaviour of flanged concrete beams", Cement Concrete Comp., 31(5), 331-341. https://doi.org/10.1016/j.cemconcomp.2009.02.007
  5. Chalioris, C.E. and Sfiri, E.F. (2011), "Shear performance of steel fibrous concrete beams", Procedia Eng., 14, 2064-2068. https://doi.org/10.1016/j.proeng.2011.07.259
  6. Chalioris, C.E. (2013a), "Steel fibrous RC beams subjected to cyclic deformations under predominant shear", Eng. Struct., 49, 104-118. https://doi.org/10.1016/j.engstruct.2012.10.010
  7. Chalioris, C.E. (2013b), "Analytical approach for the evaluation of minimum fibre factor required for steel fibrous concrete beams under combined shear and flexure", Constr. Build. Mater., 43, 317-336. https://doi.org/10.1016/j.conbuildmat.2013.02.039
  8. Dogan, E. and Krstulovic-Opara, N. (2003), "Seismic retrofit with continuous slurry-infiltrated mat concrete jackets", ACI Struct. J., 100(6), 713-722.
  9. FIB (CEB-FIP) (2006), Retrofitting of concrete structures by externally bonded FRPs with emphasis on seismic applications, Bulletin.
  10. Greek Code for the Repair and Strengthening of Reinforced Concrete Buildings (2009), Draft No 3, (E.P.P.O), Athens.
  11. Hackman, L., Farell, M. and Dunhan, O. (1992), "Slurry infiltrated mat concrete (SIMCON)", Concrete Int., 14(12), 53-56.
  12. Henager, C.H. (1977), "Steel fibrous ductile concrete joints for seismic-resistant structures", Reinforced Concrete Structures in Seismic Zones. ACI Special Publication, SP-53, American Concrete Institute, Detroit, 371-386.
  13. Karayannis, C.G. (1995), "Numerical Approach to Steel Fibre Reinforced Concrete under Torsion", J. Struct. Eng. Rev. (Incorporated in the Journal Engineering Structures), 7(2), 83-91.
  14. Karayannnis, C., Chalioris, C. and Sideris, K. (1998), "Effectiveness of R/C beam-column connection repair using epoxy resin injections", J. Earthq. Eng., 2(2), 217-240.
  15. Karayannis, C.G. (2000), "Nonlinear analysis and tests of steel-fiber concrete beams in torsion", Struct. Eng. Mech., 9(5), 323-338. https://doi.org/10.12989/sem.2000.9.4.323
  16. Karayannis, C.G. (2000), "Analysis and experimental study for steel fiber pullout from cementitious matrices", Adv. Compos. Lett., 9(4), 243-256.
  17. Karayannis, C., Chalioris, C. and Sirkelis, G. (2008), "Local retrofit of exterior rc beam-column joints using thin rc jackets - an experimental study", Earthq. Eng. Struct. D., 37, 727-740. https://doi.org/10.1002/eqe.783
  18. Karayannis, G.C. and Sirkelis, M.G. (2008), "Strengthening and rehabilitation of rc beam-column joints using carbon-FRP jacketing and epoxy resin injection", Earthq. Eng. Struct. D., 37(5), 769-790. https://doi.org/10.1002/eqe.785
  19. Park, R. (2002), "A summary of results of simulated seismic loads tests on reinforced concrete beam-column joints, beams and columns with substand and reinforcing details", J. Earthq. Eng., 6(2), 147-174.
  20. Paulay, T. and Park, R. (1984), Joints of reinforced concrete frames designed for earthquake resistance Research Report 84-9, Department of Civil Engineering, University of Canterbury, Christchurch, New Zealand.
  21. Rodriguez, M. and Santiago, S. (1998), "Simulated seismic load tests on two-storey waffle-flat-plate structure rehabilitated by jacketing", ACI Struct. J., 95(2), 129-145.
  22. Tsonos, A.G. (2002), "Seismic repair of exterior R/C beam-to-column joints using two-sided and three-sided jackets", Struct. Eng. Mech., 13(1), 17-34. https://doi.org/10.12989/sem.2002.13.1.017
  23. Tsonos, A.G. (2003), "Repair of beam-column joints of reinforced concrete structures by the removal and replacement technique", Proceedings of the 14th Greek Conference on Concrete Structures, KOS Island, Greece, 15-17 October.
  24. Tsonos, A.G. (2006), "Steel fiber high-strength concrete for the earthquake-strengthening of buildings by jacketing without the use of conventional reinforcement", Proceedings of the 15th Greek Conference on Concrete Structures, Alexandroupolis, Greece, 25-27 October.
  25. Tsonos, A.G. (2007), Steel fiber reinforced concrete of high-strength for the construction of jackets foe earthquake-strengthening of buildings without the use of conventional reinforcement, Patent No 1005657 awarded by the Greek Industrial Property Organization (OBI).
  26. Tsonos, A.G. (2008), "Effectiveness of CFRP-jackets and RC-jackets in post-earthquake and pre-earthquake retrofitting of beam-column subassemblages", Eng. Struct., 30(3), 777-793. https://doi.org/10.1016/j.engstruct.2007.05.008
  27. Tsonos, G.A. (2010), "Performance enhancement of r/cbuilding columns through shotcrete jacketing", Eng. Struct., 32(3), 726-740. https://doi.org/10.1016/j.engstruct.2009.12.001
  28. UNDP/UNIDO PROJECT RER/79/015, UNIDO (1983), Repair and strengthening of reinforced concrete, stone and brick masonry buildings. In Building Construction under Seismic Conditions in the Balkan Regions, 5, Vienna, 231 pages.

피인용 문헌

  1. Pre-earthquake and post-earthquake retrofitting of poorly detailed exterior RC beam-to-column joints vol.109, 2016, https://doi.org/10.1016/j.engstruct.2015.11.009
  2. Equivalent bilinear elastic single degree of freedom system of multi-degree of freedom structure with negative stiffness vol.365, 2016, https://doi.org/10.1016/j.jsv.2015.11.005
  3. Analytical prediction of seismic behavior of RC joints and columns under varying axial load vol.174, pp.None, 2014, https://doi.org/10.1016/j.engstruct.2018.07.103
  4. Reinforced Concrete Beams with Carbon-Fiber-Reinforced Polymer Bars-Experimental Study vol.6, pp.4, 2014, https://doi.org/10.3390/fib6040099
  5. Experimental Assessment of RC Beam-Column Connections with Internal and External Strengthening Techniques vol.2019, pp.None, 2019, https://doi.org/10.1155/2019/2828353
  6. Rehabilitation and strengthening of exterior RC beam-column connections using epoxy resin injection and FRP sheet wrapping: Experimental study vol.72, pp.6, 2014, https://doi.org/10.12989/sem.2019.72.6.723
  7. Study on Seismic Performance of Improved High-Strength Concrete Pipe‐Pile Cap Connection vol.2020, pp.None, 2020, https://doi.org/10.1155/2020/4326208
  8. Behaviour of RC beam-column joint with varying location of construction joints in the column vol.20, pp.1, 2021, https://doi.org/10.12989/eas.2021.20.1.029
  9. SSI effects on the redistribution of seismic forces in one-storey R/C buildings vol.20, pp.3, 2021, https://doi.org/10.12989/eas.2021.20.3.261
  10. Effectiveness of the Novel Rehabilitation Method of Seismically Damaged RC Joints Using C-FRP Ropes and Comparison with Widely Applied Method Using C-FRP Sheets-Experimental Investigation vol.13, pp.11, 2021, https://doi.org/10.3390/su13116454
  11. Application of X-Shaped CFRP Ropes for Structural Upgrading of Reinforced Concrete Beam-Column Joints under Cyclic Loading-Experimental Study vol.9, pp.7, 2014, https://doi.org/10.3390/fib9070042
  12. Seismic Performance of RC Beam-Column Joints Designed According to Older and Modern Codes: An Attempt to Reduce Conventional Reinforcement Using Steel Fiber Reinforced Concrete vol.9, pp.7, 2014, https://doi.org/10.3390/fib9070045
  13. Behaviour of repaired RC beam-column joints using welded wire mesh and jacketed with polymer modified mortar vol.21, pp.1, 2014, https://doi.org/10.12989/eas.2021.21.1.079
  14. Analytical Model for the Design of HSFC and UHSFC Jackets with Various Steel Fiber Volume Fraction Ratios for the Retrofitting of RC Beam-Column Joints vol.13, pp.20, 2014, https://doi.org/10.3390/su132011209