Abstract
An effective method for the linear analysis of dynamic response of submerged underwater oil storage tanks resting on a horizontal seabed to horizontal earthquake excitations is presented. The tank is axisymmetric in shape, has a flexible wall/roof, and is filled with oil and water. A general hybrid-finite element solution procedure has been formulated, wherein the tank structure, the interior fluids, as well as the near-field of the exterior water region are discretized into a toroidal finite-element network. The tank displacement is calculated as a superposition of the first few modes of the structure's free vibration. Contribution from the hydrodynamic interaction to the coupled motion is obtained by solving the Laplace equation with the appropriate boundary conditions, which includes a matching to the exterior far-field pressure (analytic) representation to simplify the computation process. The effects of fluids surrounding and inside the tank are studied. It is demonstrated that these effects have, in general, a significant impact on the tank earthquake response analysis. A comprehensive and predictive computer program for use in such tank response analysis has been developed for engineering applications.
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