Slender steel columns : How they are affected by imperfections and bracing stiffness
(2016) In Structures 8. p.35-43- Abstract
Finite-element programs can be used for designing columns and their bracing systems. It is well known, however, that the output obtained from such programs is highly dependent upon the input (such as imperfections and stiffness properties). In the present study, the effects of imperfections on the predicted strength and stiffness requirements of steel columns and of their bracing systems are investigated. Two different systems are analyzed: 1) a braced non-sway column and 2) a braced sway column. It was found that a poor choice of the shape of the initial imperfections can provide unrealistic results in terms of both the buckling load on the columns and the predicted reactions of the bracings. It was also found that superimposing... (More)
Finite-element programs can be used for designing columns and their bracing systems. It is well known, however, that the output obtained from such programs is highly dependent upon the input (such as imperfections and stiffness properties). In the present study, the effects of imperfections on the predicted strength and stiffness requirements of steel columns and of their bracing systems are investigated. Two different systems are analyzed: 1) a braced non-sway column and 2) a braced sway column. It was found that a poor choice of the shape of the initial imperfections can provide unrealistic results in terms of both the buckling load on the columns and the predicted reactions of the bracings. It was also found that superimposing different imperfection shapes can contribute to obtaining realistic and trustworthy results. Furthermore, it was shown that the shapes of the initial imperfections that lead to the lowest buckling load and those that result in the strongest bracing forces, are generally not the same.
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- author
- Klasson, Anders LU ; Crocetti, Roberto LU and Hansson, Eva Frühwald LU
- organization
- publishing date
- 2016-11-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Bracing stiffness, Column buckling, Energy method, Imperfection shapes, Non-linear modeling
- in
- Structures
- volume
- 8
- pages
- 9 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:84991466998
- wos:000391298700004
- ISSN
- 2352-0124
- DOI
- 10.1016/j.istruc.2016.08.004
- language
- English
- LU publication?
- yes
- id
- 0c9b1666-2ae3-43cd-bf48-2f3a13031fc5
- date added to LUP
- 2016-10-28 09:01:37
- date last changed
- 2024-12-14 12:30:03
@article{0c9b1666-2ae3-43cd-bf48-2f3a13031fc5,
abstract = {{<p>Finite-element programs can be used for designing columns and their bracing systems. It is well known, however, that the output obtained from such programs is highly dependent upon the input (such as imperfections and stiffness properties). In the present study, the effects of imperfections on the predicted strength and stiffness requirements of steel columns and of their bracing systems are investigated. Two different systems are analyzed: 1) a braced non-sway column and 2) a braced sway column. It was found that a poor choice of the shape of the initial imperfections can provide unrealistic results in terms of both the buckling load on the columns and the predicted reactions of the bracings. It was also found that superimposing different imperfection shapes can contribute to obtaining realistic and trustworthy results. Furthermore, it was shown that the shapes of the initial imperfections that lead to the lowest buckling load and those that result in the strongest bracing forces, are generally not the same.</p>}},
author = {{Klasson, Anders and Crocetti, Roberto and Hansson, Eva Frühwald}},
issn = {{2352-0124}},
keywords = {{Bracing stiffness; Column buckling; Energy method; Imperfection shapes; Non-linear modeling}},
language = {{eng}},
month = {{11}},
pages = {{35--43}},
publisher = {{Elsevier}},
series = {{Structures}},
title = {{Slender steel columns : How they are affected by imperfections and bracing stiffness}},
url = {{http://dx.doi.org/10.1016/j.istruc.2016.08.004}},
doi = {{10.1016/j.istruc.2016.08.004}},
volume = {{8}},
year = {{2016}},
}