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Application of Hydrodynamic Pressure for Three­dimensional Earthquake Safety Analysis of Dam Intake Towers

댐 취수탑 3차원 내진안전성 평가에서의 동수압 적용방법에 관한 연구

  • Song, Gwang-Seok (Department of Civil and Environmental Engineering, Dongguk University-Seoul) ;
  • Min, Kyoung-Uk (Department of Civil and Environmental Engineering, Dongguk University-Seoul) ;
  • Bea, Jungju (Korea Infrastructure Safety Corporation) ;
  • Lee, Jeeho (Department of Civil and Environmental Engineering, Dongguk University-Seoul)
  • 송광석 (동국대학교 건설환경공학과) ;
  • 민경욱 (동국대학교 건설환경공학과) ;
  • 배정주 (한국시설안전공단) ;
  • 이지호 (동국대학교 건설환경공학과)
  • Received : 2018.02.19
  • Accepted : 2018.03.28
  • Published : 2018.04.30

Abstract

In the present study, effective hydrodynamic pressure modeling methods for three-dimensional earthquake safety analysis of a dam intake tower structure are investigated. Time history analysis results using the Westergaard added mass and Chopra added mass methods are compared with the one by the CASI (Coupled Acoustic Structural Interaction) method, which is accepted as giving almost exact solutions, to evaluate the difference in displacement response, stress and dynamic eccentricity. The 3D time history analysis of a realistic intake tower, which has the standard geometry widely used in Korea, shows that the Chopra added mass method gives similar results in displacement and stress and less conservative results in dynamic eccentricity to CASI ones, while the Westergaard added mass yields much more conservative results in all measures. This study suggests to use the CASI method directly for three-dimensional earthquake safety analysis of a dam intake tower, if computationally possible.

Keywords

Earthquake safety;Intake tower;Hydrodynamic pressure;Added mass;Fluid-structure interaction;Acoustic element

Acknowledgement

Supported by : 한국시설안전공단

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