Abstract
AbstractRing‐stiffened flat bottom tanks are widely used in many industries for the storage of liquids, such as oil, fertilizers, water, sewage and sludge. Material efficiency is achieved by combining thin plates with ring‐stiffeners. When the bin is covered by a dome or cone roof, high meridional forces due to live or snow loads may trigger axial buckling of the shell. Ring stiffeners are beneficial, not just against buckling due to wind, but to reduce the risk of stability failure of tanks and silos caused by meridional compression as well.This paper presents the outcome of a parametrical study concerned with axial buckling and the most effective placement of the stiffening rings depending on the stiffener distance, cross‐sectional area and slenderness of the cylinder. Buckling curve parameters are deduced using the modified capacity curve. These allow the direct application of the analysis results in a hand calculation procedure that enables practitioners to take into account the benefits, which come with ring stiffeners against buckling due to axial compression.
Highlights
Ring-stiffened shells are widely used as tanks or silos to store a variety of goods, such as water, oil or grain and other solids
Covered bins may suffer meridional compression due to snow and roof live loads as well as heavy machinery placed on top of the roof
It is still possible to achieve an economical plate thickness when the reduced imperfection sensitivity, which is one of the benefits when using stiffening rings, is appropriately considered. It was shown in [1] that especially closely spaced ring-stiffeners at a distance of up to one buckling wave (BuW, lbuW = 3.46√rt) may allow for huge strength gain compared to unstiffened shells
Summary
Ring-stiffened shells are widely used as tanks or silos to store a variety of goods, such as water, oil or grain and other solids. It is still possible to achieve an economical plate thickness when the reduced imperfection sensitivity, which is one of the benefits when using stiffening rings, is appropriately considered. It was shown in [1] that especially closely spaced ring-stiffeners at a distance of up to one buckling wave (BuW, lbuW = 3.46√rt) may allow for huge strength gain compared to unstiffened shells. While for unstiffened shells a weld type A shape deviation according to [5] leads to similar results as the axis-symmetric eigenform-affine imperfection, for ring-stiffened shells no specific studies are available on ring-stiffened cylinders that allow a comparison. It does not allow to take into account a special localized placement of an imperfection
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