Finn E Jørgensen

Overview of Function Modelling - IDEF0

The paper gives a brief overview over the background and contents of the function modelling methodology IDEFO. The purpose is to inform the reader about the origin of the methodology, the methods related to it, why and how to use it, and the terminology and semantics in the methodology.

Buckling behaviour of a liquid storage tank

Abstract The buckling behaviour of a liquid storage tank built up of circular cylindrical shell-sections with different thicknesses is investigated. In any partially filled state the critical vacuum for bifurcation is determined taking into account the weight of the structure. For a storage tank with small geometrical imperfections the behaviour is analysed asymptotically using Koiters general post-buckling theory. The initial post-buckling analysis based on the assumption of linear pre-buckling behaviour indicates that the storage tank is imperfection-sensitive in any partially filled state. Finally, bifurcation analyses accounting for nonlinear pre-buckling show that the assumption of linear pre-buckling is a good approximation even at high liquid levels.