한국지진공학회논문집 (Journal of the Earthquake Engineering Society of Korea)

  • 제28권1호
  • /
  • Pages.21-32
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  • 2024
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  • 1226-525X(pISSN)
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  • 2234-1099(eISSN)
한국지진공학회 (Earthquake Engineering Society of Korea)
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유체-구조물-지반 상호작용을 고려한 비결합 말뚝기초에 지지된 LNG 저장탱크의 수평지진입력에 대한 지진응답 매개변수해석

A Parametric Study on the Seismic Response Analysis of LNG Storage Tank with Disconnected Pile Foundation Subjected to Horizontal Seismic Input Considering Fluid-Structure-Soil Interaction

  • 손일민 (전남대학교 일반대학원 건축토목공학과) ;
  • 김재민 (전남대학교, 토목공학과)
  • Son, Il-Min (Department of Architecture and Civil Engineering, Graduate School, Chonnam National University) ;
  • Kim, Jae-Min (Department of Civil Engineering, Chonnam National University)
  • 투고 : 2023.08.15
  • 심사 : 2023.11.27
  • 발행 : 2024.01.01
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초록

This study performed the seismic response analysis of an LNG storage tank supported by a disconnected piled raft foundation (DPRF) with a load transfer platform (LTP). For this purpose, a precise analytical model with simultaneous consideration of Fluid-Structure Interaction (FSI) and Soil-Structure Interaction (SSI) was used. The effect of the LTP characteristics (thickness, stiffness) of the DPRF system on the seismic response of the superstructure (inner and outer tanks) and piles was analyzed. The analytical results were compared with the response of the piled raft foundation (PRF) system. The following conclusions can be drawn from the numerical results: (1) The DPRF system has a smaller bending moment and axial force at the head of the pile than the PRF system, even if the thickness and stiffness of the LTP change; (2) The DPRF system has a slight stiffness of the LTP and the superstructure member force can increase with increasing thickness. This is because as the stiffness of the LTP decreases and the thickness increases, the natural frequency of the LTP becomes closer to the natural frequency of the superstructure, which may affect the response of the superstructure. Therefore, when applying the DPRF system, it is recommended that the sensitivity analysis of the seismic response to the thickness and stiffness of the LTP must be performed.

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참고문헌

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