Buckling of webs of crane runway girders is caused by local stresses from transverse patch loads and beam stresses from bending moment and shear force. Buckling design with respect to the related German or European standard requires the evaluation of buckling slendernesses for each of the three single stress components. Within this procedure the resistances of the plate and the cross section respectively are at first calculated independent for transverse force, bending moment and shear force. Finally the interaction of these components is considered via interaction relations. The procedure suggested in the study is based on simultaneous treatment of the problem under combined loading.
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