A physically non-linear GBT-based finite element for steel and steel-concrete beams including shear lag effects

David Henriques, Rodrigo Gonçalves, Dinar Camotim

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

This paper introduces an accurate and computationally efficient GBT-based finite element, specifically tailored to capture the materially non-linear behaviour of wide-flange steel and steel-concrete composite beams up to collapse. The element incorporates reinforced concrete cracking/crushing, shear lag effects and steel beam plasticity (including shear deformation of the steel web). A set of numerical examples is presented, showing that the proposed element is capable of capturing all relevant phenomena with a very small computational cost. In addition, analytical solutions for elastic shear lag are derived and the GBT modal decomposition features are employed to extract valuable information concerning the effect of shear lag phenomena up to collapse. For validation and comparison purposes, results obtained with shell/brick finite element models are also presented.

Original languageEnglish
Pages (from-to)202-215
Number of pages14
JournalThin-Walled Structures
Volume90
DOIs
Publication statusPublished - 2015

Keywords

  • Generalised Beam Theory (GBT)
  • Physically non-linear behaviour
  • Shear lag
  • Steel-concrete composite beams

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