Ultimate Strength of Girder Subjected to Shear / Bending Loads

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Classical theories on ultimate strength of plate girders in shear/bending loading have already been employed in ISUM formulation for plate girders encountered in ship structuores. Girders in doublebottom type structures, however, may show different collapse behaviour. To clarify this behaviour and to investigate the applicability of classical theories (Basler and Fujii ), finite element analysis is used, both on plate girder specimens and on double-bottom girders. It was found that the behaviour of web panels is similar to that of plate girders, thus related assumptions on buckling and post-buckling web behaviour may be kept, or slightly changed. Conversely, the flange behaviour is totally different, since these are not isolated but parts of continuous plating of inner and outer bottom; their dimensions are also very different from those designed for actual plate girders. New assumptions are needed to estimate flange contribution in girder collapse, in every loading condition. A new idea is proposed in this paper, to improve the accuracy of ultimate bending moment estimation. FEA results also shed some light on the collapse under combined shear and bending. As a general conclusion, estimation of buckling and ultimate shear force may still employ Fujii's theory, and / or adjust it to particulars of double-bottom girders. Corresponding bending moment limit values, however, cannot be calculated with plate girder theories; as mentioned above, 'flange' behaviour is completely different, especially due to continuity of plating and its dimensions.
社団法人日本船舶海洋工学会の論文
2001-03-25

Ultimate Strength of Girder Subjected to Shear / Bending Loads

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