Abstract
The object of this paper is to evaluate the structural adequacy of two existing large diameter steel tanks filled at low liquid levels by application of current design specifications. Emphasis is given on buckling of the circumferential shell and phenomena related to overall stability. Calculations according to the American standard API 650, which provides analytical expressions for determining overturning and sliding resistance as well as a design procedure for stiffening the shell against wind action, are presented. Simulation of the tanks via the finite element method, for obtaining the necessary shell stresses, was performed as required by the European standard EN1993-1-6. Based on the results, overall stability was checked and shell buckling was evaluated according to the “stress design” concept described in the aforementioned code. Differences in the results between the two standards are discussed and comments regarding their safety are made.
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