Bifurcation buckling of aboveground oil storage tanks under internal pressure

摘要

Overpressurization can occur due to ignition of flammable vapors existing inside aboveground oil storage tanks.Such accidetns could happen mor efrequently than other types.In the tank design,when internal pressure increases,the sidewall-to-roof joint is expected to fail before failure occurs in the sidewall-to-bottom joint.This dsign concept is the so-called "frangible roof joint".The major failure mode is bifurcation buckling in this case.This paper describes the bifurcation buckling in both joints under internal pressure.Elastic-plastic axisymmetric shell finite element analysis was performed involving large deformation in the prebuckling state.