Structural Engineering and Mechanics

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Three-field mixed beam-column finite element for geometric and material nonlinear analysis

  • Ferreira, Miguel (CERIS, Instituto Superior Tecnico, University of Lisbon) ;
  • Providencia, Paulo (University of Coimbra, INESC Coimbra) ;
  • Costa, Ricardo (Civil Engineering Department, ISISE, University of Coimbra) ;
  • Gala, Pedro (DEC ESTG, INESC Coimbra, Polytechnic Institute of Leiria) ;
  • Almeida, Joao (DECivil, ICIST, CERIS, Instituto Superior Tecnico, University of Lisbon)
  • Received : 2020.05.11
  • Accepted : 2021.05.28
  • Published : 2021.07.25
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Abstract

A mixed element (3fME) for geometric and material nonlinear finite element analysis of plane skeletal structures is presented, which can reach any predefined accuracy with only one element per structural member. This element is based on the 3-field approach-an application of the Hu-Washizu principle-directly approximating the fields of displacements, strains and stresses. The presented formulation considers both (i) geometrically nonlinear behavior-by including the second-order term in the strain-displacement relations and establishing equilibrium in the deformed configuration-and (ii) materially nonlinear elastoplastic behavior, at the fibre level, automatically handling the axial-bending interaction. The illustrative examples include both compression- and tension-bending interaction, and compare the accuracy of the novel finite element with published results.

Keywords

Acknowledgement

This work is partially supported by the Portuguese Foundation for Science and Technology under project grant UIDB/00308/2020.

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