Seismic Analysis of Rectangular Liquid Storage Structures Ssing Fluid Elements

J. Ocean Eng. Technol. 1992;6(2):46-54.

유체요소를 이용한 직사각형 유체 저장구조물의 지진해석

김영석,김제민,윤정방

한국과학기술원 토목공학과,한국원자력연구소,한국과학기술원 토목공학과

Keywords: Liquid Storage structure, Fuid Structure Interaction, Response Spectrum Analysis, Fluid Element, Reduced Integration

핵심용어: 유체 저장구조물, 유체 구조물 상호작용, 응답스펙트럼해석, 유체요소, 감차적분

Abstract

In this paper, behavior of rectangular storage structures under earthquake loadings are investigated. Linear sloshing is assumed in this study. The effect of the wall flexibility is considered. Eulerian and lagrangian approaches are presented. The Eulerian approach is carried out by solving the boundary value problem for the fluid motion. In the lagrangian approach, the fluid as well as the storage structure is modelled by the finite element method. The fluid region is discretized by using fluid elements. The (1 $ imes$ 1)-reduced integration is carried out for constructing the stiffness matrices of the fluid elements. Seismic analysis of the coupled system is carried out by the response spectra method. The numerical results show that the fluid forces on the wall obtained by two approaches are in good agreements. By including the effect of the wall flexibility, the forces due to fluid motion can be increased very significantly.