Global Instability of Elliptical Hollow Section Beam-columns under Compression and Biaxial Bending

Title: Global Instability of Elliptical Hollow Section Beam-columns under Compression and Biaxial Bending
Authors: Law, KH
Gardner, L
Item Type: Journal Article
Abstract: The global instability of elliptical hollow section members under combined compression plus biaxial bending is studied in this paper by means of laboratory testing and numerical simulations. A total of 9 beam-column tests were carried out under different combinations of compression and bending about both principal axes. The material properties of the tested sections were determined by means of tensile coupon tests. All tested elliptical hollow sections were EHS 150×75×5, and three nominal member lengths of 1 m, 2 m and 3 m were considered. Graphs of applied load versus mid-span bending moment, based on theoretical first and second order elastic considerations and the experimental second order inelastic response, are presented and described. Numerical models were initially validated against the experimental data using measured material and geometric properties, including imperfections. The models were subsequently employed in parametric studies to assess the influence of member slenderness and cross-sectional aspect ratio on the structural response. Finally, based on the experimental and numerical findings, design rules for hot-finished EHS beam-columns were assessed and statistically verified.
Issue Date: 31-Dec-2013
Date of Acceptance: 25-Nov-2013
ISSN: 1598-2351
Publisher: Springer Verlag
Start Page: 745
End Page: 759
Journal / Book Title: International Journal of Steel Structures
Volume: 13
Issue: 4
Copyright Statement: The final publication is available at Springer via
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/G003556/1
Keywords: Science & Technology
Construction & Building Technology
Engineering, Civil
combined axial compression and bending
biaxial bending
elliptical hollow sections
laboratory testing
numerical modelling
steel structures
0905 Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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