Numerical Analysis of the Base-Isolated Rectangular Storage Tanks under Bi-directional Seismic Excitation
Hamid Reza Vosoughifar, Mohaddeseh Abbaspour Naderi
Journal of Advances in Mathematics and Computer Science · pp. 3054–3067 · Published 19 Aug 2014
10.9734/BJMCS/2014/11299Abstract
Liquid storage tanks are critical elements in the water supply scheme and firefighting system in many industrial facilities for storage of water, oil, chemicals and liquefied natural gas. A common effective method to reduce the seismic response of liquid storage tanks is using base-isolation systems. In this research, the finite element method is used to investigate the seismic behavior of rectangular liquid tanks in three-dimensional domains. The continuous liquid mass of the tank was modeled as lumped masses referred as convective mass, impulsive and rigid mass. The rectangular water tank in two cases base isolated and conventional non-isolated system was selected as a case study. The sloshing displacement and base shear response in two mentioned cases subjected to various ground motions under horizontal components X and Y directions were considered and the results were compared. For this purpose the nonlinear time history analyses of the model were performed. As a result, base isolation was found to be effective in reducing the base shear values, without significantly affecting the sloshing displacements.
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