Experimental Study on Seismic Performance of Base-Isolated Bridge

  • Chung, Woo Jung (Daewoo Engineering Company) ;
  • Yun, Chung Bang (Department of Givil Engineering, Korea Advance Institute of Science and Technology) ;
  • Kim, Nam Sik (Hyundai Institute of Construction Technology) ;
  • Seo, Ju Won (Hyundai Institute of Construction Technology)
  • Published : 1998.09.01

Abstract

Base isolation is an innovative design strategy that provides a practical alternative for the seismic design of structures. Base isolators, mainly employed to isolate large structures subjected to earthquake ground excitations and to rehabilitate structures damaged by past earthquakes, deflect and absorb the seismic energy horizontally transmitted to the structures. This study demonstrated that the base isolation system may offer effective performance for bridges during severe seismic events through shaking table tests. Two base isolation systems using laminated rubber bearings with and without hydraulic dampers are tested. The test results strongly show that the laminate rubber bearings cause the natural period of the bridge structure increased considerably, which results in the deck acceleration and the shear forces on the deck acceleratino and the shear forces on the piers reduced significantly. The results also demonstrate that the hydraulic dampers enhance the system's capacity in dissipating energy to reduce the relative displacement between the bridge deck and the pier.

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References

  1. Guide Specification for Seismic Isolation Design AASHTO
  2. Earthquake Engineering and Structural Dynamics v.5 no.3 Seismic base isolation: review and bibliography Kelly, J. M.
  3. Earthquake Spectra v.6 no.2 Seismic isolation: history, application, and performance - a world view Buckle, I.;Mayes, R.
  4. Pressure Vessels and Piping Conference v.181 Research, development and implementation of rubber bearings for seismic isolation Fujita, T.(et al.)
  5. National Center for Earthquake Engineering Research, Report No. NCEER-92-0032 Experimental and analytical investigation of seismic response of structures with supplemental fluid viscous dampers Constantinou, M. C.;Symans, M. D.
  6. Engineering Structures v.18 no.4 Experimental study of bridge seismic sliding isolation systems Tsopelas, P.;Constantinou, M. C.;Okamoto, S.;Fujii, S.;Ozaki, D.
  7. Ph. D. Thesis. Korea Advanced Institute of Science and Technology Experimental Study on Seismic Performance Improvement of Structures Using Base Isolation Techniques Chung, W. J.
  8. Journal of the Earthquake Engineering Society of Korea v.1 no.4 Experimental techniques for evaluating seismic performance of base-isolated structure Yun, C. B.;Chung, W. J.;Kim, N. S.;Kim, D. H.
  9. Engineering Structures Shaking table and pseudodynamic tests for the evaluation of the seismic performance of base-isolated structures Chung, W. J.;Yun, C. B.;Kim, N. S.;Seo, J. W.