Large-scale lateral–torsional buckling tests of welded girders

Currently, the Canadian steel design standard, CAN/CSA S16-14, prescribes unified design equations for predicting lateral–torsional buckling that do not distinguish between rolled and welded sections. However, residual stresses present in welded sections can create unfavourable conditions that may reduce their resistance to lateral–torsional buckling. Recent numerical studies reinforce this notion and have indicated that the current design equations to determine lateral– torsional buckling resistance may be unconservative for welded girders, particularly in the inelastic range. Despite the numerical evidence, there is a paucity in up-to-date physical testing of welded girders fabricated with modern processes, which forms a substantial gap when concluding the adequacy of CSA S16-14. This paper discusses the lateral–torsional buckling physical testing program being undertaken at the University of Alberta Steel Centre. Development of the unique girder-stability test-bed is described and preliminary results of the first large-scale specimen, 9.75 m (32 ft) in length and with laterally and torsionally pinned end conditions, are presented.

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