Abstract
High stresses originate in the region of the support of circular cylindrical storage tanks and vessels. These influence the brittle fracture and crack growth by cyclic loading. The plastic deformation caused by the squeeze of the saddle into the vessel limits, in particular, the carrying capacity. Besides local stresses the effect of buckling is not negligible. The difference between the loose and welded support is discussed. Unstiffened and ring-stiffened circular cylindrical tanks are taken into consideration. Derived formulae enable the designer to take into account the effect of cyclic load, fatigue and buckling.

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