Analysis of the Behavior of Steel Silos Under Wind Loading (Buckling, Stiffeners, Corrugated Shell, Anchor Bolts)
Briassoulis, Demetres
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https://hdl.handle.net/2142/70956
Description
Title
Analysis of the Behavior of Steel Silos Under Wind Loading (Buckling, Stiffeners, Corrugated Shell, Anchor Bolts)
Author(s)
Briassoulis, Demetres
Issue Date
1985
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Abstract
This study deals with the linear elastic analysis and the linearized buckling analysis of steel silos under wind loading. In the first part, the wind loading pattern is established and the equivalent orthotropic rigidities of standard corrugated sheets are reviewed and, in some cases, new improved formulas are derived.
Three real silos are analyzed. The linear elastic analysis of a tall silo reveals that the wind rings cause significant localized disturbances in the hoop stresses. The intermediate and shallow silos show a shell-spaceframe interactive behavior with the roof loading being a major factor in their overall behavior. No sway is observed for any of the three silos. The anchorage requirements of all silos may be predicted analytically by an adjusted membrane theory solution.
An analytical model was developed for the linearized buckling analysis of tall silos, based on the assumptions of uniform wall thickness and uniform equidistant stiffeners. According to the results obtained, use of vertical or horizontal stiffeners only is inadequate. Use of both kinds of stiffeners result in a dramatic increase of the bifurcation load, but, material failure becomes then the most probable factor of failure. The wind ring eccentricity was found also to be a very important factor, as the bifurcation load increases dramatically with it. Initial imperfections are taken into account by using an appropriate knockdown factor. Then, for small wind ring eccentricities, the factor of safety against buckling is found to be 3 to 4, while material failure becomes of at least equal importance to buckling.
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