Modelo discreto para avaliação dos esforços e momentos máximos de silos de armazenamento em condição de carga/descarga: uma análise exploratória
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2022-11-29
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Universidade Federal de Goiás
Resumo
Brazil is one of the largest grain producers in the world, with an annual production of 255 tons
of grains, making the demand for storage of these grains high. The type of structure most used
for storage are metallic cylindrical silos, being slender shell structures, which have a great
capacity to resist axial loads and lateral pressures that are submitted by grain storage. This study
aims to analyze the behavior of orthotropic and longitudinally stiffened silos subjected to static
and dynamic actions. For mathematical modeling of the orthotropic silo, the nonlinear Sanders-
Koiter theory is used and the grain pressures under the silo walls are defined according to the
Janssen model. Discretized equations of motion for the cantilever-free silo are obtained by
applying Hamilton’s Principle and the Rayleigh-Ritz method. First, the results obtained for the
maximum displacements and natural frequency by the analytical model are compared with
those determined from a numerical analysis via finite elements. This first step, in addition to
validating the proposed analytical formulation, allows determining the number of degrees of
freedom necessary to obtain a reliable analytical model for the other parametric analyzes of this
work. Then, the increase of the internal forces and moments that arise in the silo during the
grain charging/discharging process for different geometries, physical properties and distance
between the longitudinal stiffeners are evaluated. From the results found in this work, we
propose factors to increase the static effects for an orthotropic, cantilever-free and
longitudinally stiffened silo, in order to simplify the initial design phases without disregarding
the importance of the dynamic effects that arise due to the grain charging/discharging process.
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Citação
PEREIRA, H. O. Modelo discreto para avaliação dos esforços e momentos máximos de silos de armazenamento em condição de carga/descarga: uma análise exploratória. 2023. 114 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2022.