Local buckling and ultimate strength of slender elliptical hollow sections in compression

Journal article


McCann, F, Fang, C, Gardner, L and Silvestre, N (2016). Local buckling and ultimate strength of slender elliptical hollow sections in compression. Engineering Structures. 111, pp. 104-118.
AuthorsMcCann, F, Fang, C, Gardner, L and Silvestre, N
Abstract

© 2015 Elsevier Ltd.The local buckling behaviour and ultimate cross-sectional strength of tubular elliptical profiles in compression is examined in this study through numerical modelling. The numerical models were first validated against previous experimental data with good agreement observed, enabling an extensive parametric study to be performed. A total of 270 elliptical sections were simulated in order to examine the influence of cross-section aspect ratio, geometric imperfections and local slendernesses. The obtained ultimate capacities, load-deformation responses and failure modes are discussed. It was found that for lower cross-section aspect ratios the behaviour of the elliptical hollow sections (EHS) was similar to that of cylindrical shells across a number of metrics; however, as the aspect ratio increased, more plate-like stable postbuckling behaviour was observed. Imperfection sensitivity was found to decrease with increasing slenderness and aspect ratio. The influence of the shape of the initial imperfection on the strengths of the EHS columns was also assessed and was found to be generally limited. Finally, a design method has been proposed for Class 4 EHS members that reflects the reduction in capacity due to local buckling with increasing slenderness, but also recognises the improved postbuckling stability with increasing aspect ratio; the proposals were shown to provide safe and accurate predictions for the strengths of the EHS columns with nondimensional local slendernesses up to 2.5 and aspect ratios from 1.1 to 5.0.

Keywords0905 Civil Engineering; Civil Engineering
Year2016
JournalEngineering Structures
Journal citation111, pp. 104-118
PublisherLondon South Bank University
ISSN0141-0296
Digital Object Identifier (DOI)doi:10.1016/j.engstruct.2015.12.020
Publication dates
Print06 Jan 2016
Publication process dates
Deposited04 Jul 2017
Accepted16 Dec 2015
Accepted author manuscript
License
CC BY-NC-ND 4.0
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https://openresearch.lsbu.ac.uk/item/8754v

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