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Evaluation of Soil-Structure Interaction Responses of LNG Storage Tank Subjected to Vertical Seismic Excitation Depending on Foundation Type

기초형식에 따른 LNG 저장탱크의 지반-구조물 상호작용을 고려한 수직방향 지진응답 분석

  • Son, Il-Min (Department of Architecture and Civil Engineering, Graduate School, Chonnam Univ.) ;
  • Kim, Jae-Min (Department of Civil Engineering, Chonnam Univ.)
  • 손일민 (전남대학교 대학원 건축토목공학과) ;
  • 김재민 (전남대학교 토목공학과)
  • Received : 2019.08.24
  • Accepted : 2019.08.30
  • Published : 2019.12.31

Abstract

We investigate the effect of soil-structure interaction (SSI) on the response of LNG storage tanks to vertical seismic excitation depending on the type of foundation. An LNG storage tank with a diameter of 71 m on a clay layer with a thickness of 30 m upon bedrock, was selected as an example. The nonlinear behavior of the soil was considered in an equivalent linear method. Four types of foundation were considered, including shallow, piled raft, and pile foundations (surface and floating types). In addition, the effect of soil compaction within the group pile on the seismic response of the tank was investigated. KIESSI-3D, an analysis package in the frequency domain, was used to study the SSI and the stress in the outer tank was calculated. Based on an analysis of the numerical results, we arrived at three main conclusions: (1) for a shallow foundation, the vertical stress in the outer tank is less than the fixed base response due to the SSI effect; (2) for foundations supported by piles, the vertical stress can be greater than the fixed base stress due to the increase in the vertical impedance due to the piles and the decrease in radiation damping; and (3) soil compaction had a miniscule impact on the seismic response of the outer tank.

Acknowledgement

Supported by : 국토교통과학기술진흥원

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