Techno Press

Steel and Composite Structures   Volume 1, Number 1, March 2001, pages 131-144
Buckling of aboveground oil storage tanks under internal pressure
Shoichi Yoshida(Japan)

Abstract     [Full Text]
    Overpressurization can occur due to the ignition of flammable vapors existing insidernaboveground oil storage tanks. Such accidents could happen more frequently than other types ofrnaccident. In the tank design, when the internal pressure increases, the sidewall-to-roof joint isrnexpected to fail before failure occurs in the sidewall-to-bottom joint. This design concept is the socalledrn?rangible roof joint?introduced in API Standard 650. The major failure mode is bifurcationrnbuckling in this case. This paper presents the bifurcation buckling pressures in both joints underrninternal pressure. Elastic and elastic-plastic axisymmetric shell finite element analysis was performedrninvolving large deformation in the prebuckling state. Results show that API Standard 650 does notrnevaluate the frangible roof joint design conservatively in small diameter tanks.
Key Words
    finite element method; axisymmetric shell; structural analysis; bifurcation buckling;rnelastic-plastic problem; large deformation; oil storage tank; internal pressure; frangible roof design.
Formerly Koyo Iron Works & Construction Company Tokyo, Japan

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