Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Simplified Analysis of Rectangular Liquid Storage Tanks Considering Fluid-Structure Interaction

유체-구조물 상호작용을 고려한 직사각형 액체저장탱크의 단순해석법

  • Lee, Jin Ho (Department of Ocean Engineering, Pukyong National University) ;
  • Cho, Jeong-Rae (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 이진호 (부경대학교 해양공학과) ;
  • 조정래 (한국건설기술연구원 구조연구본부)
  • Received : 2022.07.12
  • Accepted : 2022.08.04
  • Published : 2022.09.01
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Abstract

A simplified method for earthquake response analysis of a rectangular liquid storage tank is proposed with fluid-structure interaction considered. In order to simplify the complex three-dimensional structural behavior of a rectangular liquid storage tank, it is assumed that structural deformation does not occur in the plane parallel to the direction in which the earthquake ground motion is applied but in the plane perpendicular to the direction. The structural deformation is approximated by combining the natural modes of the simple beam and the cantilever beam. The hydrodynamic pressure, the structure's mass and stiffness, and the hydrodynamic pressure's added mass are derived by applying the Rayleigh-Ritz method. The natural frequency, structural deformation, pressure, effective mode mass, and effective mode height of the rectangular liquid storage tank are obtained. The structural displacement, hydrodynamic pressure, base shear, and overturning moment are calculated. The seismic response analysis of an example rectangular liquid storage tank is performed using the proposed simplified approach, and its accuracy is verified by comparing the results with the reference solution by the finite element method. Existing seismic design codes based on the hydrodynamic pressure in rigid liquid storage tanks are observed to produce results with significant errors that cannot be ignored.

Keywords

Acknowledgement

본 연구는 환경부 재원으로 환경시설 재난재해 대응기술개발사업의 지원을 받아 연구되었습니다. 이에 감사드립니다(2022002850001).

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