Time-Domain Earthquake Response Analysis of Rectangular Liquid Storage Tank Considering Fluid-Structure-Soil Interaction

Jin Ho Lee; Jeong-Rae Cho; Seong-Wook Han

doi:10.7734/COSEIK.2020.33.6.383

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2020 Vol.33, Issue 6 Preview Page Next Page

Research Paper

Time-Domain Earthquake Response Analysis of Rectangular Liquid Storage Tank Considering Fluid-Structure-Soil Interaction 유체-구조물-지반 상호작용을 고려한 직사각형 액체저장탱크의 시간영역 지진응답해석

31 December 2020. pp. 383-390

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Abstract

Since the dynamic behaviors of liquid storage tanks on flexible soil are significantly influenced by the fluid-structure-soil interaction (FSSI), its effects must be rigorously considered for accurate earthquake analysis and seismic design of the storage system. In this study, dynamic analysis is performed for a rectangular liquid storage tank on flexible soil, and its dynamic characteristics are examined by rigorously considering the effects of FSSI. The hydrodynamic force and the interaction force between the structure and soil are evaluated using the finite-element approach. In the evaluations, mid-point integrated finite elements and viscous dampers are considered for energy radiation into the infinite soil. The effective earthquake force is then obtained from free-field analysis. It is thus demonstrated that the earthquake responses of the rectangular liquid storage tank on flexible soil are significantly influenced by the FSSI.

Keywords

rectangular liquid storage tank

fluid-structure interaction

soil-structure interaction

impulsive mode

convective mode

유연한 지반에 놓인 액체저장탱크의 지진 거동은 유체-구조물-지반 상호작용에 의해 복잡하게 나타나므로, 이 시스템의 지진응답과 피해를 정확하게 예측하기 위해서는 이를 엄밀히 고려하여야 한다. 이 연구에서는 유체-구조물-지반 상호작용을 엄밀히 고려하여 유연한 지반에 놓인 직사각형 액체저장탱크의 지진응답 해석을 수행하고 그 응답 특성을 분석하고자 한다. 이를 위해 지진하중 작용 시 발생하는 유체의 동수압력 및 지반과 구조물 간의 상호작용력을 유한요소 기법을 사용하여 산정한다. 이때, 반무한 지반에서의 에너지 방사를 고려하기 위해 mid-point integrated finite element와 점성 감쇠기를 사용하여 지반 원역의 거동을 모사한다. 이와 같이 산정된 동수압력과 지반-구조물 상호작용력을 구조물의 유한요소에 작용시킨다. 자유장 해석을 통하여 입사 지진파에 의한 유효 지진력을 산정한다. 유연한 지반에 놓인 직사각형 액체저장탱크의 지진응답 해석을 통하여 지반-구조물 상호작용의 효과로 인해 시스템 응답의 변화가 다양하게 나타남을 확인할 수 있다. 그러므로, 유연한 지반에 놓인 직사각형 액체저장탱크의 내진설계를 수행하거나 내진성능을 검토할 때는 유체-구조물-지반 상호작용을 엄밀히 고려하여야 할 것이다.

키워드

직사각형 액체저장탱크

유체-구조물 상호작용

지반-구조물 상호작용

충격모드

대류모드

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 33
No :6
Pages :383-390
Received Date : 2020-09-28
Revised Date : 2020-10-15
Accepted Date : 2020-10-16
DOI :https://doi.org/10.7734/COSEIK.2020.33.6.383

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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