Modification of Water Equivalent Displacement Relation under the Horizontal Seismic Load in the Ground Elliptical Tanks

Lotfi, Reza; Mahmoudabadi, Masooud; Dehghani, Ehsan

doi:10.22065/jsce.2024.459666.3428

Modification of Water Equivalent Displacement Relation under the Horizontal Seismic Load in the Ground Elliptical Tanks

Document Type : Original Article

Authors

Reza Lotfi ¹

Masooud Mahmoudabadi ²

Ehsan Dehghani ²

¹ Other, Faculty of Engineering, University of Qom, Qom, Iran

² Assistant Professor, Faculty of Engineering, , University of Qom, Qom, Iran

10.22065/jsce.2024.459666.3428

Abstract

The water equivalent displacement under horizontal seismic load in the ground elliptical tanks has been investigated in the current study. Basically, tank is a structure used to store different types of fluid, and it is also widely used in refineries, sewage treatment plants, and factories in the form of ground and elevated tanks made from concrete and steel. Regarding the application of huge dynamic and hydrodynamic loads on a tank at the time of earthquake and the great importance of the structure’s complete function continuity in the critical situations, it is highly important to study its seismic behavior. In Housner theory, water equivalent displacement is a key parameter in calculation of convective vibration mode parameters such as convective pressure and wave height. US nuclear reactors and earthquakes code has presented a simple relation to calculate water equivalent displacement. To obtain more calculation accuracy in the ground elliptical tanks, a suitable equation has been provided in the current study for the water equivalent displacement, based on modelling and dynamic analysis results of the tanks using finite elements method in ANSYS software, by the use of principles of statistical regression. Because of higher determination index, the use of the equation proposed by this study instead of the equation presented by US nuclear reactors and earthquakes code, provides more accuracy in the tank design applications. By the study of the conclusions of this research, it was revealed that the determination index of water equivalent displacement relation developed by this research is 44.8% higher than that of the corresponding relation of US nuclear reactors and earthquakes code.

Keywords

Elliptical tanks

Hydrodynamic relations

Housner theory

Finite elements

Statistical regression

Subjects

Structural and Earthquake Engineering

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