Dynamic Analysis of Floating Bridge with Discrete Pontoons Subject to Earthquake Load

이산 폰툰형 부유식 교량의 지진응답 해석

  • 권장섭 (서울대학교 지진공학연구센터) ;
  • 백인열 (경원대학교 토목환경공학과) ;
  • 장승필 (서울대학교 지구환경시스템공학부)
  • Published : 2002.09.01

Abstract

Dynamic response analysis are conducted for a floating bridge subjected to multiple support earthquake excitation. The floating bridge used in this study is supported by discrete floating pontoons and horizontal pretension cables supported at both ends of the bridge. The bridge is modeled with finite elements and the hydrodynamic added mass and added damping due to the surrounding fluid around pontoons are obtained using boundary elements. Multiple support excitation is introduced at both ends of the bridge and the time history response is compared to that of a simultaneous excitation. The results shows that the differences between two results are not so large except for cable tension for which the multiple support excitation yields larger values. During the analysis the concept of retardation function is utilized to consider the frequency dependency of the hydrodynamic coefficients.

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