Characteristics of Earthquake Responses of a Rectangular Liquid Storage Tanks Subjected to Bi-directional Horizontal Ground Motions

Abstract

Analytical and experimental studies show that the dynamic behavior of liquid storage tanks is significantly influenced by the fluid-structure interaction (FSI). The effects of FSI must be rigorously considered for accurate earthquake analysis and seismic design of liquid storage tanks. In this study, a dynamic analysis of a rectangular liquid storage tank subjected to bi-directional earthquake ground motions is performed and its dynamic characteristics are examined, with the effects of FSI rigorously considered. Hydrodynamic pressure is evaluated using the finite-element approach with acoustic elements and applied to the structure. The responses of the rectangular tank subjected to bi-directional earthquake ground motions are thus obtained. It can be observed that the incident angle of bi-directional horizontal ground motions has significant effects on the dynamic responses of the considered system. Therefore, the characteristics of the system must be considered in its seismic design and performance evaluation.

Earthquake Response Analysis of Cylindrical Liquid-Storage Tanks Considering Nonlinear Fluid-Structure Soil Interactions

“…이러한 현상을 유체-구조물 상호 작용이라고 한다. 구조물의 강성이 클 경우에는 구조물이 실 제적으로 강체로 거동하므로 유체-구조물 상호작용을 고려하 지 않으나, 그렇지 않을 경우에는 유체-구조물 상호작용이 구 조물의 진동 및 저장액체의 유동에 미치는 영향을 반드시 고려 하여야 한다 (Kim et al, 1996;Koh et al, 1998;Lee and Lee, 2020;Park et al, 2000). (Kim et al, 1998a;1998b;Lee et al, 2016a;2016b).…”