Abstract
A previous paper [1] proposed an elastic tripping model using a Rayleigh-Ritz approach with 4 d.f. This paper extends the elastic model into the inelastic range, using deformation theory and an iterative and incremental formulation. Nonetheless, because of the efficiency of the Rayleigh-Ritz formulation, the solution is very rapid, even for ordinary PCs. The method can be used for analyzing the flexural-torsional and lateral-torsional buckling (“tripping”) behavior of flanged stiffeners subjected to axial compression, end moment, uniform lateral pressure and any combination of these. The effects of cross-sectional distortion, postbuckling behavior of the plate (incorporated by considering the plate effective width) and plasticity are included. Results obtained using the method are shown to be in good agreement with experimental results, and to be more accurate than other methods.
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