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Unequally spaced lateral bracings on compression flanges of steel girders

Mehri, Hassan LU ; Crocetti, Roberto LU and Gustafsson, Per-Johan LU (2015) In Structures 3. p.236-243
Abstract
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.... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Lateral bracing, Stiffness requirement, Steel girder
in
Structures
volume
3
pages
236 - 243
publisher
Elsevier
external identifiers
  • scopus:84938198992
ISSN
2352-0124
DOI
10.1016/j.istruc.2015.05.003
language
English
LU publication?
yes
id
1c657111-8fb8-44cc-8e59-5b502886a7ee (old id 7615656)
date added to LUP
2015-08-10 10:09:02
date last changed
2017-01-22 03:43:29
@article{1c657111-8fb8-44cc-8e59-5b502886a7ee,
  abstract     = {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.},
  author       = {Mehri, Hassan and Crocetti, Roberto and Gustafsson, Per-Johan},
  issn         = {2352-0124},
  keyword      = {Lateral bracing,Stiffness requirement,Steel girder},
  language     = {eng},
  pages        = {236--243},
  publisher    = {Elsevier},
  series       = {Structures},
  title        = {Unequally spaced lateral bracings on compression flanges of steel girders},
  url          = {http://dx.doi.org/10.1016/j.istruc.2015.05.003},
  volume       = {3},
  year         = {2015},
}