Nonlinear analysis of cellular steel beams under combined buckling modes

摘要: Abstract This paper discusses the nonlinear analysis of normal and high strength cellular steel beams under combined buckling modes. A 3-D finite element model has been developed, which accounted for initial geometric imperfection, residual stresses material nonlinearities flange web portions beams. The was verified against tests on having different lengths, cross-sections, loading conditions failure Failure loads, load–mid-span deflection relationships modes were predicted from analysis. An extensive parametric study involving one hundred twenty performed using to effects change in cross-section geometries, beam length behaviour results shown that failing due distortional web-post exhibited a considerable decrease loads. It is also use offers increase loads less slender compared with Australian Standards lateral torsional buckling. Specification predictions are generally conservative by buckling, unconservative quite