Earthquakes and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Earthquake-resistant rehabilitation of existing RC structures using high-strength steel fiber-reinforced concrete jackets

  • Kalogeropoulos, George I. (Department of Civil Engineering, Aristotle University of Thessaloniki) ;
  • Tsonos, Alexander-Dimitrios G. (Department of Civil Engineering, Aristotle University of Thessaloniki) ;
  • Konstantinidis, Dimitrios (Department of Civil Engineering T.E., Alexander Technological Educational Institute of Thessaloniki) ;
  • Iakovidis, Pantelis E. (Department of Civil Engineering, Aristotle University of Thessaloniki)
  • Received : 2019.03.05
  • Accepted : 2019.06.24
  • Published : 2019.07.25
⟨ Previous Next ⟩

Abstract

The effectiveness of an innovative method for the earthquake-resistant rehabilitation of existing poorly detailed reinforced concrete (RC) structures is experimentally investigated herein. Eight column subassemblages were subjected to earthquake-type loading and their hysteretic behaviour was evaluated. Four of the specimens were identical and representative of columns found in RC structures designed in the 1950s-70s period for gravity load only. These original specimens were subjected to cyclic lateral deformations and developed brittle failure mechanisms. Three of the damaged specimens were subsequently retrofitted with innovative high-strength steel fiber-reinforced concrete (HSSFC) jackets. The main variables examined were the jacket width and the contribution of mesh steel reinforcement in the seismic performance of the enhanced columns. The influence of steel fiber volume fraction was also examined using test results of a previous work of Tsonos et al. (2017). The fourth earthquake damaged subassemblage was strengthened with a conventional RC jacket and was subjected to the same lateral displacement history as the other three retrofitted columns. The seismic behaviour of the subassemblages strengthened according to the proposed retrofit scheme was evaluated with respect to that of the original specimens and that of the column strengthened with the conventional RC jacket. Test results clearly demonstrated that the HSSFC jackets effectively prevented the development of shear failure mechanisms, while ensuring a ductile seismic response similar to that of the subassemblage retrofitted with the conventional RC jacket. Ultimately, an indisputable superiority in the overall seismic performance of the strengthened columns was achieved with respect to the original specimens.

Keywords

References

  1. Aboutaha, R.S., Engelhardt, M.D., Jirsa, J.O. and Kreger, M.E. (1999), "Rehabilitation of shear critical concrete columns by use of rectangular steel jackets", ACI Struct. J., 96(1), 68-78.
  2. ChaiI, Y.H., Priestley, M.N. and Seible, F. (1991), Seismic retrofit of circular bridge columns for enhanced flexural performance", ACI Struct. J., 88(5), 572-584.
  3. Choi, E., Chung, Y.S., Park, K. and Jeon, J.S. (2013), "Effect of steel wrapping jackets on the bond strength of concrete and the lateral performance of circular RC columns", Eng. Struct., 48, 43-54. https://doi.org/10.1016/j.engstruct.2012.08.026.
  4. CSRTC (2008), New Code of Steel Reinforcement Technology for Concrete, Athens, Greece.
  5. Daudey, X. and Filiatrault, A. (2000), "Seismic evaluation and retrofit with steel jackets of reinforced concrete bridge piers detailed with lap-splices", Can. J. Civil Eng., 27(1), 1-16. https://doi.org/10.1139/l99-029.
  6. Durrani, A.J. and Wight, J.K. (1987), "Earthquake resistance of reinforced concrete interior connections including a floor slab", ACI J. Proc., 84(84-S42), 400-406.
  7. Ehsani, M. (2010), "FRP super laminates", ACI Concrete Int., 32(3), 49-53.
  8. Ehsani, M.R. and Wight, J.K. (1985), "Effect of transverse and slab on behavior of reinforced concrete beam-to-column connections", ACI J. Proc., 82(82-17), 188-195.
  9. Ehsani, M.R. and Wight, J.K. (1985), "Exterior reinforced concrete beam-to-column connections subjected to earthquake - type loading", ACI J. Proc., 82(4), 492-499.
  10. El Gawady, M., Endeshaw, M., McLean, D. and Sack, R. (2010), "Retrofitting of rectangular columns with deficient lap splices", J. Compos. Constr., 14(1), 22-35. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000047.
  11. EN 1998-1-1 Eurocode 2 (2004), Design of Concrete Structures, Part 1-1: General Rules and Rules for Buildings.
  12. EN 1998-1 Eurocode 8 (2004), Design of Structures for Earthquake Resistance. Part 1: General Rules, Seismic Actions and Rules for Buildings, Stage 51.
  13. Hackman, L., Farell, M. and Dunhan, O. (1992), "Slurry infiltrated mat concrete (SIMCON)", Concrete Int., 14(12), 53-56.
  14. Hakuto, S., Park, R. and Tanaka, H. (2000), "Seismic load tests on interior and exterior beam-column joints with substandard reinforcing details", ACI Struct. J., 97(1), 11-25.
  15. Henager, C.H. (1977), "Steel fibrous ductile concrete joints for seismic-resistant structures. Reinforced Concrete Structures in Seismic Zones", ACI Special Publications SP-53, American Concrete Institute, Detroit, USA.
  16. Julio, N.B.S.E. and Branco, A.B.F. (2008), "Reinforced concrete jacketing-interface influence on cyclic loading response", Struct. J., 105(4), 471-477.
  17. Kalogeropoulos, G. and Tsonos, A.-D.G. (2014), "Effectiveness of r/c jacketing of substandard r/c columns with short lap splices", Struct. Monit. Mainten., 1(3), 273-292. http://dx.doi.org/10.12989/smm.2014.1.3.273
  18. Kalogeropoulos, G. and Tsonos, A.-D.G. (2019), "Improvement of the cyclic response of RC columns with inadequate lap Splices-experimental and analytical investigation", Earthq. Struct. 16(3), 279-293. https://doi.org/10.12989/eas.2019.16.3.279.
  19. Kalogeropoulos, G., Tsonos, A.-D.G. Konstandinidis, D. and Tsetines, S. (2016), "Pre-earthquake and post-earthquake retrofitting of poorly detailed exterior RC beam-to-column joints", Eng. Struct., 109, 1-15. https://doi.org/10.1016/j.engstruct.2015.11.009.
  20. Karayannis, C., Chalioris, C. and Sirkelis, G. (2008), "Local retrofit of exterior beam-column joints using thin RC jacketsan experimental study", Earthq. Eng. Struct. Dyn., 37, 727-746. https://doi.org/10.1002/eqe.783.
  21. Karayannis, C.G. and Sirkelis, G.M. (2008), "Strengthening and rehabilitation of RC beam-column joints using carbon-FRP jacketing and epoxy resin injection", Earthq. Eng. Struct. Dyn., 37(5), 769-790. https://doi.org/10.1002/eqe.785.
  22. Pampanin, S., Bolognini, D. and Pavese, A. (2007), "Performance-based seismic retrofit strategy for existing reinforced concrete frame systems using fiber-reinforced polymer composites", J. Compos. Constr., 11(2), 211-226. https://doi.org/10.1061/(ASCE)1090-0268(2007)11:2(211).
  23. Pavese, A., Bolognini, D. and Peloso, S. (2004), "FRP seismic retrofit of RC square hollow section bridge piers", J. Earthq. Eng., 8(1), 225-250.
  24. Priestley, M.J.N., Seible, F. and Calvi, G.M. (1996), Seismic Design and Retrofit of Bridges, John Willey and Sons, New York, NY, USA.
  25. Saadatmanesh, H., Ehsani, M.R. and Jin, L. (1997), "Repair of earthquake-damaged RC columns with FRP wraps", ACI Struct. J., 94(2), 206-214.
  26. Saadatmanesh, H., Ehsani, R.M. and Jin, L. (1996), "Seismic strengthening of circular bridge pier models with fiber composites", ACI Struct. J., 93(6), 639-647.
  27. Tsonos, A.-D.G. (2007), "Steel fiber reinforced concrete of highstrength for the construction of jackets for earthquakestrengthening of buildings without the use of conventional reinforcement", Patent No 1005657 awarded by the Greek Industrial Property Organization (OBI).
  28. Tsonos, A.-D.G. (2014), "An innovative solution for strengthening of old R/C structures and for improving the FRP strengthening method", Struct. Monit. Mainten., 1(3), 323-338. http://dx.doi.org/10.12989/smm.2014.1.3.323.
  29. Tsonos, A.-D.G., Kalogeropoulos, G., Iakovidis, P. and Konstantinidis, D. (2017), "Seismic retrofitting of pre-1970 RC bridge columns using innovative jackets", Int. J. Struct. Eng., 8(2), 133-147. https://doi.org/10.1504/IJSTRUCTE.2017.084631.
  30. Tsonos, A.-D.G. (2008), "Effectiveness of CFRP-jackets and r/cjackets 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.
  31. Yeh, Y. and Mo, Y. (2005), "Shear retrofit of hollow bridge piers with carbon fiber-reinforced polymer sheets", J. Compos. Constr., 9(4), 327-336. https://doi.org/10.1061/(ASCE)1090-0268(2005)9:4(327).

Cited by

  1. Seismic performance of non-ductile detailing RC frames: An experimental investigation vol.19, pp.6, 2019, https://doi.org/10.12989/eas.2020.19.6.485
  2. 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
  3. Application of X-Shaped CFRP Ropes for Structural Upgrading of Reinforced Concrete Beam-Column Joints under Cyclic Loading-Experimental Study vol.9, pp.7, 2019, https://doi.org/10.3390/fib9070042