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From:
J. Michael Rotter (University of Edinburgh, Scotland, UK, School of Civil and Environmental Engineering),
“Pressures, Stresses and Buckling in Metal Silos containing Eccentrically Discharging Solids”, Greiner Institute for Steel and Shell Structures, TU Graz, 2001
ABSTRACT: The eccentric discharge of stored solids from moderately slender metal silos has caused many dramatic and catastrophic buckling failures. Despite these many failures, eccentric discharge failures are poorly understood even by specialists in shell structures, and the cause of failure is often misinterpreted. In particular, buckles occurring well up the wall of a silo are often thought to be difficult to explain. This paper sets out the theory of pressures occurring in silos under eccentric pipe flow where part of the flow channel is in contact with the silo wall. It then uses pressures predicted by this theory to analyse an example structure, with different flow channel geometries. The stress patterns are seen to be such that local axial compression buckles are likely to occur well up the wall, and it is found that certain sizes of flow channel are critically dangerous to the structural integrity of the silo shell.
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