Abstract
This paper deals with problems connected with the design and operation of thin-walled steel silos for storing pelleted materials. A failure of a faultily designed silo is described and its causes are examined. The parameters of the stored material were determined. The exceptional (unforeseen) loads produced by arching and their consequences were analysed. In order to compare the effect of calculation assumptions on the degree of use of the load-bearing capacity of the stringer its buckling capacity under the stored material load alone was checked. On the basis of the analyses the probable course of the events leading to the failure was determined. It is pointed out that the exceptional loads and the disturbance of the bulk material flow by silo structural and technological fittings need to be taken into account in the design of silos.
Highlights
The constant tendency towards silo construction cost reduction results in the use of increasingly thinner metal sheets and profiles
The walls, bottoms and hoppers of the silos are subjected to greater bulk material impacts than the design ones
As the arch was being removed negative pressure was produced below the failure level, the support conditions changed, the load capacity of the stringers was exceeded and as a result of the plastic yielding of the stringers the upper part of the silo shifted downwards
Summary
The constant tendency towards silo construction cost reduction results in the use of increasingly thinner metal sheets and profiles. This paper discusses the problems connected with the design and operation of thin-walled steel silos for pelleted materials. Relief plate girder beams located above the rotor provide a shield for the discharge aiding mechanism They relieve the bottom and the equipment, but at the same time they significantly disturb the flow of the pelleted material. R. Antonowicz et al Analysis of loads and structural capacity of steel silo with corrugated wall for pelleted material and hard coal). The designer instead of the properties of the pelleted material, assumed the properties of wheat as a heavier material, without paying attention to the effect of the other properties on the component pressures and completely neglecting exceptional loads, especially the caking of the pelleted material and arching, and the effect of the relief beams on the standard dependences for the variation in bulk material pressure along the wall height
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