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“LBA” = “Linear Buckling Analysis”
FROM:
Oluwole K. Fajuyitan (1), Adam J. Sadowski (1) and J. Michael Rotter (2)
(1) Department of Civil and Environmental Engineering, Imperial College London, UK
(2) Institute for Infrastructure and Environment, University of Edinburgh, UK
“A study of imperfect cylindrical steel tubes under global bending and varying support conditions”, Eighth International Conference on Advances in Steel Structures, Lisbon, Portugal, July 22-24, 2015
ABSTRACT: This paper presents the findings of a computational study into the effect of different support conditions and geometric imperfections on the nonlinear elastic stability of tubular members of varying length under global bending. Using the finite element analysis software ABAQUS, the tubular member was modelled as an isotropic thin-walled cylindrical steel shell and subjected to a uniform bending moment distribution. The classical elastic critical buckling moment, the linear bifurcation moment and the nonlinear buckling moment were computed and the imperfection sensitivity under the linear buckling eigenmode was examined. The study demonstrates that the support conditions at the edges have a significant effect on the predicted buckling moment for short tubes, but that this influence vanishes for longer tubes. The effect of initial geometric imperfections on the nonlinear buckling strength was found to be sensitive to the tube length. The strength of longer tubes was much reduced, but in shorter ones, the effect was neutral or mildly beneficial. Overall, tubular members under global bending do not appear to be as imperfection-sensitive as those under uniform axial compression.
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