Loading…

Imperfection amplitudes for nonlinear analysis of open thin-walled steel cross-sections used in rack column uprights

When numerical models are used to predict behaviour of open thin-walled steel cross-sections, the nonlinear analysis results can be influenced by the magnitudes introduced as initial imperfection. At present, a wide range of values is considered in research concerning this topic. This paper explores...

Full description

Saved in:
Bibliographic Details
Published in:Thin-walled structures 2014-03, Vol.76, p.28-41
Main Authors: Pastor, M.M., Casafont, M., Bonada, J., Roure, F.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:When numerical models are used to predict behaviour of open thin-walled steel cross-sections, the nonlinear analysis results can be influenced by the magnitudes introduced as initial imperfection. At present, a wide range of values is considered in research concerning this topic. This paper explores up to what point the nonlinear analysis results are sensitive to the choice of imperfection magnitudes and attempt to refine the spectrum of magnitudes that should be used. The study focuses on rack uprights (with and without perforations) under compression and the numerical model has been validated with experimental tests conducted by the authors. Three different column lengths have been selected to reproduce a mainly local, distortional and global failure mode, so that coupled instabilities have not to be considered in this case. The results show that the ultimate load and collapse mode are both sensitive to imperfection amplitude, mainly in the case of distortional buckling. •Analysis of initial geometrical imperfections commonly used in FE modelling.•Sensitivity analysis to imperfection amplitude.•Comparison of FE results with experimental testing.
ISSN:0263-8231
1879-3223
DOI:10.1016/j.tws.2013.10.025