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Seismic Behavior of a Bridge with Pile Bent Structures Subjected to Multi-Support Excitation

다지점 가진에 의한 단일형 현장타설말뚝 교량의 지진거동

  • Sun, Chang-Ho (Department of Civil and Environmental Engineering, University of Ulsan) ;
  • Ahn, Sung-Min (Kunhwa Engineering and Consulting) ;
  • Kim, Ick-Hyun (Department of Civil and Environmental Engineering, University of Ulsan)
  • 선창호 (울산대학교 건설환경공학부) ;
  • 안성민 (건화엔지니어링 철도구조사업부) ;
  • 김익현 (울산대학교 건설환경공학부)
  • Received : 2019.11.08
  • Accepted : 2019.11.18
  • Published : 2019.12.31

Abstract

It is important to ensure the seismic safety of pile-bent bridges constructed in areas with thick soft ground consisting of various soil layers against seismic motion in these layers. In this study, several synthetic seismic waves that are compatible with the seismic design spectrum for rock sites were generated, and the ground acceleration history of each soil layer was obtained based on ground analyses. Using these acceleration histories, each soil layer was modeled using equivalent linear springs, and multi-support excitation analyses were performed using the input motion obtained at each soil layer. Due to the nonlinear behavior of the soft soil layers, the intensity of the input ground motion was not amplified, which resulted in the elastic behavior of the bridge. In addition, inputting the acceleration history obtained from a particular layer simultaneously into all the ground springs reduced the response. Therefore, the seismic performance of this type of bridge might be overestimated if multi-excitation analysis is not performed.

Acknowledgement

Supported by : 국토교통부

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