Application of the Oil Damper to Spherical Tank in Earthquake-Resistant Design

概要

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Spherical tanks at present are designed so as not to break down or collapse even when they are exposed to a typical earthquake like the El Centro. However, if the oil damper is applied to the tanks, their resistance to earthquakes will be increased even more. This paper deals with a theoretical analysis on the suitable damping coefficient of a double acting damper fitted horizontally between the bottom of the tank and its base. In the theory, the optimum damping was selected to minimize the transmissibility resonance curve in the predominant frequency range of earthquakes. A scheme for the application of the damper was proposed, with which forced and free vibration tests were conducted for an actual 200,000 m^3 gas tank with and without a damper. As a result of the studies it was proved that the application of a damper to spherical tanks is very effective in increasing their resistivity to earthquakes.
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