Earthquakes and Structures

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Restoration of pre-damaged RC bridge columns using basalt FRP composites

  • Fahmy, Mohamed F.M. (International Institute for Urban Systems Engineering, Southeast University) ;
  • Wu, Zhishen (International Institute for Urban Systems Engineering, Southeast University)
  • Received : 2016.05.09
  • Accepted : 2017.10.13
  • Published : 2018.05.25
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Abstract

This study aims to identify the effect of both longitudinal reinforcement details and damage level on making a decision of repairing pre-damaged bridge columns using basalt fiber reinforced polymer (BFRP) jackets. Two RC bridge columns with improper details of the longitudinal and/or transverse reinforcement were tested under the effect of a constant axial load and increasing lateral cyclic loading. Test results showed that the lap-splice column exhibited an inferior performance where it showed rapid degradation of strength before achieving the theoretical strength and its deformation capacity was limited; however, quick restoration is possible through a suitable rehabilitation technique. On the other hand, expensive repair or even complete replacement could be the decision for the column with the confinement failure mode. After that, a rehabilitation technique using external BFRP jacket was adopted. Performance-based design details guaranteeing the enhancement in the inelastic performance of both damaged columns were addressed and defined. Test results of the repaired columns confirmed that both reparability and the required repairing time of damage structures are dependent on the reinforcement details at the plastic hinge zone. Furthermore, lap-splice of longitudinal reinforcement could be applied as a key design-tool controlling reparability and restorability of RC structures after massive actions.

Keywords

References

  1. AASHTO LRFD Bridge Design Specifications (2013), American Association of State Highway and 406 Transportation Officials: Washington, DC.
  2. Chopra, A.K (2011), Dynamics of Structures, Prentice Hall, New Jersey, U.S.A.
  3. ElSouri, A.M. and Harajli, M.H. (2011), "Seismic repair and strengthening of lap splices in RC columns: carbon fiberreinforced polymer versus steel confinement", J. Compos. Constr., 15(5), 721-731. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000213
  4. Fahmy, M.F., Wu, Z. and Wu, G. (2010), "Post-earthquake recoverability of existing RC bridge piers retrofitted with FRP composites", Constr. Buil. Mater., 24(6), 980-998. https://doi.org/10.1016/j.conbuildmat.2009.11.020
  5. Fujino, Y., Hashimoto, S. and Abe, M. (2005), "Damage analysis of Hanshin Expressway viaducts during 1995 Kobe earthquake. I: Residual inclination of reinforced concrete piers", J. Brid. Eng., 10(1), 45-53. https://doi.org/10.1061/(ASCE)1084-0702(2005)10:1(45)
  6. He, R., Grelle, S., Sneed, L.H. and Belarbi, A. (2013), "Rapid repair of a severely damaged RC column having fractured bars using externally bonded CFRP", Compos. Struct., 101, 225-242. https://doi.org/10.1016/j.compstruct.2013.02.012
  7. He, R., Sneed, L.H. and Belarbi, A. (2013), "Rapid repair of a severely damaged RC columns with different damage conditions: an experimental study", Int. J. Conc. Struct. Mater., 7(1), 35-50. https://doi.org/10.1007/s40069-013-0030-7
  8. JSCE Earthquake Engineering Committee (2000), Earthquake Resistant Design Codes in Japan, Japan Society of Civil Engineers (JSCE), Tokyo, Japan.
  9. Kakaletsis, D.J. (2016), "Comparative experimental assessment of seismic rehabilitation with CFRP strips and sheets on RC frames", Earthq. Struct., 10(3), 613-628. https://doi.org/10.12989/eas.2016.10.3.613
  10. Kawashima, K. and Miyaji, K. (2006), "Seismic performance requirement of highway bridges", Proceeding of the 8th U.S. National Conference on Earthquake Engineering, California, U.S.A., April.
  11. Pantazopoulou, S.J., Bonacci, J.F., Sheikh, S., Thomas, M.D.A. and Hearn, N. (2001), "Repair of corrosion-damaged columns with FRP wraps", J. Compos. Constr., 5(1), 3-11. https://doi.org/10.1061/(ASCE)1090-0268(2001)5:1(3)
  12. Priestley, M.N. (1996), Seismic Design and Retrofit of Bridges, John Wiley & Sons, New York, U.S.A.
  13. Rutledge, S.T., Kowalsky, M.J., Seracino, R. and Nau, J.M. (2013), "Repair of reinforced concrete bridge columns containing buckled and fractured reinforcement by plastic hinge relocation", J. Brid. Eng., 19(8), A4013001. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000492
  14. Saadatmanesh, H., Ehsani, M.R. and Jin, L. (1997), "Repair of earthquake-damaged RC columns with FRP wraps", ACI Struct. J., 94(2), 206-215.
  15. Seible, F., Priestley, M.J.N. and Innamorato, D. (1995), "Earthquake retrofit of bridge columns with continuous fiber jackets", Des. Guidelines, Advanced Compos. Technol. Transfer Consortium, Rep. No. ACTT-95/08, Vol. II, Univ. of Calif., San Diego, La Jolla, Calif.
  16. Shin, M. and Andrawes, B. (2011), "Seismic repair of RC bridge piers using shape memory alloys", Proceedings of the 2011 Structures Congress, Las Vegas, Nevada, United States, April.
  17. Sim, J., Park, C. and Moon, D.Y. (2005), "Characteristics of basalt fiber as a strengthening material for concrete structures", Compos. B: Eng., 36(6), 504-512. https://doi.org/10.1016/j.compositesb.2005.02.002
  18. Sun, Z., Wang, D., Du, X. and Si, B. (2011), "Rapid repair of severely earthquake-damaged bridge piers with flexural-shear failure mode", Earthq. Eng. Eng. Vib., 10(4), 553-567. https://doi.org/10.1007/s11803-011-0089-6
  19. Vosooghi, A. and Saiidi, M.S. (2012), "Design guidelines for rapid repair of earthquake-damaged circular RC bridge columns using CFRP", J. Brid. Eng., 18(9), 827-836. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000426
  20. Yang, Y., Sneed, L.H., Morgan, A., Saiidi, M.S. and Belarbi, A. (2015a), "Repair of RC bridge columns with interlocking spirals and fractured longitudinal bars-An experimental study", Constr. Buil. Mater., 78(1), 405-420. https://doi.org/10.1016/j.conbuildmat.2015.01.010
  21. Yang, Y., Sneed, L., Saiidi, M.S., Belarbi, A., Ehsani, M. and He, R. (2015b), "Emergency repair of an RC bridge column with fractured bars using externally bonded prefabricated thin CFRP laminates and CFRP strips", Compos. Struct., 133(1), 727-738. https://doi.org/10.1016/j.compstruct.2015.07.045