Abstract
Fabricated steel cylinders are often used as conveyor galleries, stacks or masts, or as members in offshore structures. The cylinders are fabricated by first cold rolling steel plates to form short cans and then joining these together by circumferential girth welds to yield long spans. Circumferential stiffeners are almost always present, in order that the circular shape of the tube is maintained and as an assistance when the cylinder is being handled. Longitudinal stiffeners may be used as well. If they are present, they will be welded to the cylinder surface, thereby improving the behaviour under axial compression or beam bending. The paper addresses the design of the type of cylinder commonly used as a conveyor gallery. In this application, diameters of from 2·5 to 4·0 m are typical and the radius to thickness ration, R/t, ranges from about 100 to 400. Spans can reach 60 m. The results of four large-scale flexural tests on large diameter fabricated steel cylinders that had longitudinal stiffeners and a parametric study of hypothetical cylinders of this configuration are used as the basis of the study. The paper reviews current design standards in the light of those test results, presents the results of the parametric study and makes recommendations for the design of longitudinally-stiffened fabricated steel cylinders.
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