Abstract
The structural behavior of ground supported upright cylindrical fluid tank subjected to lateral excitations due to the seismic effects is presented by considering both below and convective resonance scenarios using the FSI approach. The study of seismic response has been carried out at an actual scale on a typical API Tank of 23,000 gallons capacity. In response to seismic excitations with peak acceleration of 0.3 g, the sloshing phenomena have been studied at three fill levels. For minimizing the roof stresses in the API tank due to seismic sloshing, the roof design is modified by varying roof angles starting from flat to 30° conical roof angles with an increment of 10°. It is found that for flat roof steel tank operating at convective resonance, stress increases exponentially with the fill level resulting in tank yielding. To increase tank seismic resistance, a self-supported conical roof (SSCR) of various angles is considered. The effect of variation of SSCR angle and slenderness ratio on structural response has been studied. Using the design by analysis approach, empirical relationships for estimation of tank structural strength (TSS) and total deformations have been proposed. It is concluded that the TSS is increased up to 6 times by selecting an appropriate conical roof (30°).
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