Steel and Composite Structures

  • 제26권6호
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  • Pages.745-757
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  • 2018
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Repair of seismically damaged RC bridge bent with ductile steel bracing

  • Bazaez, Ramiro (Departamento de Obras Civiles, Universidad Tecnica Federico Santa Maria) ;
  • Dusicka, Peter (Department of Civil and Environmental Engineering, Portland State University)
  • 투고 : 2017.08.05
  • 심사 : 2018.01.18
  • 발행 : 2018.03.25
⟨ 이전 논문 다음 논문 ⟩

Abstract

The inclusion of a ductile steel bracing as means of repairing an earthquake-damaged bridge bent is evaluated and experimentally assessed for the purposes of restoring the damaged bent's strength and stiffness and further improving the energy dissipation capacity. The study is focused on substandard reinforced concrete multi-column bridge bents constructed in the 1950 to mid-1970 in the United States. These types of bents have numerous deficiencies making them susceptible to seismic damage. Large-scale experiments were used on a two-column reinforced concrete bent to impose considerable damage of the bent through increasing amplitude cyclic deformations. The damaged bent was then repaired by installing a ductile fuse steel brace in the form of a buckling-restrained brace in a diagonal configuration between the columns and using post-tensioned rods to strengthen the cap beam. The brace was secured to the bent using steel gusset plate brackets and post-installed adhesive anchors. The repaired bent was then subjected to increasing amplitude cyclic deformations to reassess the bent performance. A subassemblage test of a nominally identical steel brace was also conducted in an effort to quantify and isolate the ductile fuse behavior. The experimental data from these large-scale experiments were analyzed in terms of the hysteretic response, observed damage, internal member loads, as well as the overall stiffness and energy dissipation characteristics. The results of this study demonstrated the effectiveness of utilizing ductile steel bracing for restoring the bent and preventing further damage to the columns and cap beams while also improving the stiffness and energy dissipation characteristics.

Keywords

References

  1. Abdelnaby, A.E. (2017), "Fragility curves for RC frames subjected to Tohoku mainshock-aftershocks sequences", J. Earthq. Eng., 1-19.
  2. AISC 341-16 (2016), Seismic Provisions for Structural Steel Buildings, American Institute of Steel Construction, Chicago, IL, USA.
  3. Bazaez, R. and Dusicka, P. (2016a), "Cyclic behavior of reinforced concrete bridge bent retrofitted with buckling restrained braces", Eng. Struct., 119, 34-48. https://doi.org/10.1016/j.engstruct.2016.04.010
  4. Bazaez, R. and Dusicka, P. (2016b), "Cyclic Loading for RC Bridge Columns Considering Subduction Megathrust Earthquakes", J. Bridge Eng., 21(5), 04016009. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000891
  5. Bazaez, R. and Dusicka, P. (2017), "Performance assessment of multi-column RC bridge bents seismically retrofitted with buckling-restrained braces", Bull. Earthq. Eng. DOI: https://doi.org/10.1007/s10518-017-0279-3
  6. Chai, Y.H., Priestley, M.J.N. and Seible, F. (1991), "Retrofit of Bridge Columns for Enhanced Seismic Performance", Seismic Assessment and Retrofit of Bridges, Issue SSRP 91/03, pp. 177-196.
  7. Chang, S., Li, Y. and Loh, C. (2004), "Experimental Study of Seismic Behaviors of As-Built and Carbon Fiber Reinforced Plastics Repaired Reinforced Concrete Bridge Columns", J. Bridge Eng., 9(4), 391-402. https://doi.org/10.1061/(ASCE)1084-0702(2004)9:4(391)
  8. Cheng, C., Yang, J., Yeh, Y. and Chen, S. (2003), "Seismic performance of repaired hollow-bridge piers", Constr. Build. Mater., 17(5), 339-351. https://doi.org/10.1016/S0950-0618(02)00119-8
  9. Di Ludovico, M., Polese, M., d'Aragona, M.G., Prota, A. and Manfredi, G. (2013), "A proposal for plastic hinges modification factors for damaged RC columns", Eng. Struct., 51, 99-112. https://doi.org/10.1016/j.engstruct.2013.01.009
  10. Dong, Y. and Frangopol, D.M. (2015), "Risk and resilience assessment of bridges under mainshock and aftershocks incorporating uncertainties", Eng. Struct., 83, 198-208. https://doi.org/10.1016/j.engstruct.2014.10.050
  11. El-Bahey, S. and Bruneau, M. (2011), "Buckling restrained braces as structural fuses for the seismic retrofit of reinforced concrete bridge bents", Eng. Struct., 33(3), 1052-1061. https://doi.org/10.1016/j.engstruct.2010.12.027
  12. Fakharifar, M., Chen, G., Wu, C., Shamsabadi, A., ElGawady, M. and Dalvand, A. (2016), "Rapid Repair of Earthquake-Damaged RC Columns with Prestressed Steel Jackets", J. Bridge Eng., 21(4), 04015075. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000840
  13. FEMA306 (1998), Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings, s.l.: Applied Technology Council (ATC-43 Project), The Partnership for Response and Recovery.
  14. FEMA307 (1998), Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings - Technical Resources, s.l.: Federal Emergency Management Agency.
  15. He, R., Grelle, S., Sneed, L. 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
  16. Jeon, J.S., DesRoches, R. and Lee, D.H. (2016), "Post-repair effect of column jackets on aftershock fragilities of damaged RC bridges subjected to successive earthquakes", Earthq. Eng. Struct. Dyn., 45(7), 1149-1168. https://doi.org/10.1002/eqe.2700
  17. Kam, W.Y., Pampanin, S. and Elwood, K. (2011), "Seismic performance of reinforced concrete buildings in the 22 February Christchurch (Lyttleton) earthquake", Bull. New Zealand Soc. Earthq. Eng., 44(4), 239-278.
  18. Kawashima, K. and Buckle, I. (2013), "Structural performance of bridges in the Tohoku-Oki earthquake", Earthq. Spectra, 29(S1), S315-S338. https://doi.org/10.1193/1.4000129
  19. Lehman, D., Gookin, S., Nacamuli, A. and Moehle, J. (2001), "Repair of Earthquake-Damaged Bridge Columns", ACI Struct. J., 98(2), 233-242.
  20. NCHRP (2013), Performance-Based Seismic Bridge Design, Synthesis 440, Transportation Research Board, National Academy of Sciences, Washington, D.C., USA.
  21. Priestley, M., Seible, F. and Calvi, G. (1996), Seismic Design and Retrofit of Bridges, Wiley, New York, NY, USA.
  22. Priestley, M.J.N., Calvi, G.M. and Kowalsky, M.J. (2007), Displacement-based seismic design of structures, s.l.: IUSS Press, Italy.
  23. Saadatmanesh, H., Ehsani, M. and Jin, L. (1997), "Repair of Earthquake-Damaged RC Columns with FRP Wraps", ACI Struct. J., 94(2), 206-214.
  24. Shin, M. and Andrawes, B. (2011), "Emergency repair of severely damaged reinforced concrete columns using active confinement with shape memory alloys", Smart Mater. Struct., 20(6), 065018. https://doi.org/10.1088/0964-1726/20/6/065018
  25. Vosooghi, A. and Saiid Saiidi, M. (2013), "Design Guidelines for Rapid Repair of Earthquake-Damaged Circular RC Bridge Columns Using CFRP", J. Bridge Eng., 18(9), 827-836. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000426
  26. Wang, Y., Ibarra, L. and Pantelides, C. (2016), "Seismic Retrofit of a Three-Span RC Bridge with Buckling-Restrained Braces", J. Bridge Eng., 21(11), 04016073. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000937
  27. Wei, X. and Bruneau, M. (2016), "Case Study on Applications of Structural Fuses in Bridge Bents", J. Bridge Eng., 21(7), 05016004. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000854