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Design of non-structured roofs for steel silos by numerical methods. Comparison of FE and 3D-beam models
Research Areas
  • Engineering
Large-diameter steel silos used to store agricultural materials require in many cases the placement of a structure in their uppermost section so that roof panels can be secured in place. These structures often take the form of a lattice of radial and circular beams that support the roof and sidewall shells. The supporting roof structure, however, means an extra weight and a considerable economic cost to avoid as far as possible, extending non-structured roofs for silos as large as possible in diameter. The possibility of using self-supporting cold-formed sheets made from high-strength steel has led steel silo manufacturers to produce non-structured silo roofs exceeding 15 meters in diameters. Verification of the roof sheets can be developed according to the Eurocode 3 (EN-1993-1-3, 2006), taking into account that the steel cold-formed sheets often present buckling problems and local instabilities for tensions lower than yield strength because of their small thickness. Steel structures are frequently designed by using models of bars based on the displacement method. However, this method cannot simultaneously simulate the existence of shell and beam elements. Therefore, two different numerical models have been developed in this work in order to find the differences when calculating a silo roof made of self-supporting cold-formed steel sheets without any other auxiliary structure. A 3D beam model was developed by using Powerframe software, and a 3D finite element model was developed with ANSYS software. The results obtained show that the 3D beam model predicts higher stresses than those calculated according to the FE model. The last method allows achieving a more realistic analysis of the structure, as all the elements and contacts can be simulated.
International Conference of Agricultural Engineering CIGR-AgEng2016
Aarhus (Dinamarca)
Start Date
End Date
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Proceedings CIGR-AgEng2016
  • Autor: Eutiquio Gallego Vazquez (UPM)
  • Autor: Jose Maria Fuentes Pardo (UPM)
  • Autor: César Navarro López (UPM)
  • Autor: Francisco Ayuga Tellez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Edificación, Infraestructura y Proyectos en Ingeniería Rural y Medioambiental (EIPIRMA)
  • Departamento: Ingeniería Agroforestal
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