Issue |
MATEC Web Conf.
Volume 219, 2018
2nd Baltic Conference for Students and Young Researchers (BalCon 2018)
|
|
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Article Number | 02018 | |
Number of page(s) | 8 | |
Section | Metal Structures | |
DOI | https://doi.org/10.1051/matecconf/201821902018 | |
Published online | 29 October 2018 |
Investigation of natural frequencies of axially loaded thin-walled columns
Gdańsk University of Technology, Faculty of Civil and Environmental Engineering,
ul. Narutowicza 11/12,
80-233
Gdańsk, Poland
*
Corresponding author: luktrzeb@pg.edu.pl
The paper deals with correlation between natural frequencies of two steel thin-walled columns and the corresponding applied load. The structures are made of cold-formed lipped channel sections. The columns lengths were assumed to follow two buckling patterns – global flexural and flexural-torsional buckling. In the thicker structure two material models were considered – linearly-elastic and elastic-perfectly plastic. Numerical computations cover dynamic eigenvalue problem, linear buckling and geometrically (and materially) non-linear analysis. The correlation between squares of natural frequencies and the applied load is linear in both columns. The first natural frequencies drop to zero due to structural buckling. This method, called the Vibration Correlation Technique, allows to predict buckling loads on the basis of measured vibration frequencies of the structures. Plasticity does not affect the corresponding curves – the use of the presented technique is limited to the structures exhibiting elastic buckling behaviour.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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