Generalized Beam Theory deformation modes for steel–concrete composite bridge decks including shear connection flexibility

Luís Vieira, Rodrigo Gonçalves, Dinar Camotim, José Oliveira Pedro

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes a procedure to calculate cross-section deformation modes for steel–concrete composite bridge cross-sections, including shear connection flexibility, within the framework of the Generalized Beam Theory (GBT). The proposed procedure is computationally efficient and makes it possible to (i) handle arbitrary (flat-walled) composite cross-sections, including complex configurations with several closed cells, (ii) consider the geometric offset between the steel and concrete mid-lines, which is essential in steel–concrete composite members, and (iii) automatically identify, separate, and hierarchize the deformation modes into physically meaningful sets, including a set of shear connection slip deformation modes. For illustrative purposes, the various deformation mode sets are determined for two representative cross-sections, namely a twin-girder and a box-girder with closed longitudinal stiffeners. These deformation modes are then employed to perform the structural analysis of simply supported decks, showing that very accurate results are obtained with a small number of deformation modes and that the modal decomposition of the solution provides in-depth insight regarding the bridge structural behavior.

Original languageEnglish
Article number108408
JournalThin-Walled Structures
Volume169
DOIs
Publication statusPublished - Dec 2021

Keywords

  • Cross-section deformation
  • Distortion
  • Generalized Beam Theory (GBT)
  • Shear connection slip
  • Steel–concrete​ composite bridges

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