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Design for lateral stability of slender timber beams considering slip in the lateral bracing system

Klasson, Anders LU ; Crocetti, Roberto LU ; Björnsson, Ivar LU and Frühwald Hansson, Eva LU (2018) In Structures 16. p.157-163
Abstract

The present study investigates the significance of potential slip in the bracings of simply supported slender timber members. Three bracing configurations are considered. The first case is that of a timber beam braced at one point at mid-span, the second one braced at two points and the third one braced at three points. Possible slip in the bracing members can for example be due to joint deformation, initial crookedness of purlins and slack (or relaxation) of cables in the stabilizing bay (catenary action). In this study, it is shown that slip in the bracing system can result in a reduced load-bearing capacity (due to larger beam stresses) of the beams. Also, the greater the slip, the greater lateral deflections and consequent bracing... (More)

The present study investigates the significance of potential slip in the bracings of simply supported slender timber members. Three bracing configurations are considered. The first case is that of a timber beam braced at one point at mid-span, the second one braced at two points and the third one braced at three points. Possible slip in the bracing members can for example be due to joint deformation, initial crookedness of purlins and slack (or relaxation) of cables in the stabilizing bay (catenary action). In this study, it is shown that slip in the bracing system can result in a reduced load-bearing capacity (due to larger beam stresses) of the beams. Also, the greater the slip, the greater lateral deflections and consequent bracing forces of the braced member. A simplified approach, using a larger initial geometrical imperfection, to account for potential slip in bracings is also evaluated. This approach is found to work reasonably well in terms of stresses and bracing forces, but underestimates the lateral displacements.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bracing, Buckling, Instability, Non-linear modeling, Slip, Timber beams
in
Structures
volume
16
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85054039647
ISSN
2352-0124
DOI
10.1016/j.istruc.2018.09.007
language
English
LU publication?
yes
id
c4026359-f75f-4f7b-a378-80b9c1f0fce2
date added to LUP
2018-10-09 08:13:36
date last changed
2019-02-20 11:30:03
@article{c4026359-f75f-4f7b-a378-80b9c1f0fce2,
  abstract     = {<p>The present study investigates the significance of potential slip in the bracings of simply supported slender timber members. Three bracing configurations are considered. The first case is that of a timber beam braced at one point at mid-span, the second one braced at two points and the third one braced at three points. Possible slip in the bracing members can for example be due to joint deformation, initial crookedness of purlins and slack (or relaxation) of cables in the stabilizing bay (catenary action). In this study, it is shown that slip in the bracing system can result in a reduced load-bearing capacity (due to larger beam stresses) of the beams. Also, the greater the slip, the greater lateral deflections and consequent bracing forces of the braced member. A simplified approach, using a larger initial geometrical imperfection, to account for potential slip in bracings is also evaluated. This approach is found to work reasonably well in terms of stresses and bracing forces, but underestimates the lateral displacements.</p>},
  author       = {Klasson, Anders and Crocetti, Roberto and Björnsson, Ivar and Frühwald Hansson, Eva},
  issn         = {2352-0124},
  keyword      = {Bracing,Buckling,Instability,Non-linear modeling,Slip,Timber beams},
  language     = {eng},
  pages        = {157--163},
  publisher    = {Elsevier},
  series       = {Structures},
  title        = {Design for lateral stability of slender timber beams considering slip in the lateral bracing system},
  url          = {http://dx.doi.org/10.1016/j.istruc.2018.09.007},
  volume       = {16},
  year         = {2018},
}