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Unequally spaced lateral bracings on compression flanges of steel girders

På svenska

Author

  • Hassan Mehri
  • Roberto Crocetti
  • Per-Johan Gustafsson

Summary, in English

In the bridge sector, lateral bracings can be provided e.g. in the form of metal decks or horizontal truss bracings. Those bracings are more efficient at the regions of maximum lateral shear deformations generated from destabilizing forces of compression flanges e.g. near to the twisting supports. A model is presented in this paper, which relates the lateral buckling length of compression flange of steel girders to their lateral torsional buckling moment and can be used to investigate stiffness requirement of lateral bracings applied on the compression flanges between the twisting restraints. Analytical solutions were derived for the effects of bracing locations and bracing stiffness values on buckling length of compression flanges. Moreover, an exact and a simplified solution for the effect of rotational restraint of shorter-spans on critical load value of the compression members with unequally spanned lateral bracings were derived. The model can be suitable for design engineers to preliminary size the cross-section of beams and lateral bracings.

Publishing year

2015

Language

English

Pages

236-243

Publication/Series

Structures

Volume

3

Document type

Journal article

Publisher

Elsevier

Topic

  • Civil Engineering

Keywords

  • Lateral bracing
  • Stiffness requirement
  • Steel girder

Status

Published

ISBN/ISSN/Other

  • ISSN: 2352-0124