Abstract
The paper deals with buckling of metal cylindrical silos composed of corrugated sheets and vertical stiffeners (columns). Comprehensive finite element analyses were carried out for three real perfect silos with a different geometry (two slender silos and one intermediate slender silo) by means of a linear buckling approach. Corrugated walls were simulated as an equivalent orthotropic shell and thin-walled columns as beam elements. Numerical calculations for perfect silos with different numbers of columns made it possible to establish three different ranges of the silo buckling performance. Based on results of three dimensional calculations, an original simplified segment silo wall model was proposed for calculations of silo global buckling for sparsely distributed columns. In addition, a single column resting on the elastic foundation with the improved stiffness was suggested. Both models are shown to produce predictions that are much closer to rigorous FE calculations than the hand calculation procedures of EN 1993-4-1.
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