Combining shell and GBT-based finite elements: Linear and bifurcation analysis

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Abstract

This paper proposes a general and efficient approach to model thin-walled members with complex geometries and/or connected through joints, by combining shell and standard GBT-based (beam) finite elements. It is shown that this approach is (i) very versatile, in the sense that complex geometries can be modelled quite easily, and (ii) computationally efficient, since the shell model substructures are condensed out of the global equilibrium equations. To show the capabilities of the proposed approach, several illustrative examples are presented and discussed, concerning the behaviour of (i) members with tapered segments, (ii) members with holes and (iii) complex beam-column assemblies. For validation purposes, full shell finite element model solutions are provided, showing that an excellent match is obtained. This paper deals exclusively with the linear (first-order) and bifurcation (linear stability) analysis cases, but the proposed approach will be extended to other analysis types.

Original languageEnglish
Article number106665
JournalThin-Walled Structures
Volume152
DOIs
Publication statusPublished - Jul 2020

Keywords

  • Combined GBT-Shell model
  • Cross-section deformation
  • Distortional buckling
  • Generalised Beam Theory (GBT)
  • Global buckling
  • Local buckling
  • Shell finite elements

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