LOAD-CARRYING CAPACITY OF PLATE GIRDERS SUBJECTED TO BENDING AND SHEAR

Abstract eng:
The paper contains original theoretical analysis of the bending-shear load carrying capacity of plate girders with compact typical I cross-sections. They are combined from different steels where flanges are from higher strength steels and web is from middle steel. The homogeneous cross-section represents only limit case of the universal cross-section. The ultimate plastic stage is here considered as the perfect plastification of the web in decisive cross-section. The results of the theoretical analysis are equations for the calculation of the ultimate shear load, ultimate bending moment and bending-shear load-carrying capacity for different cross-sections. In accordance with theoretical results the simple interaction formula for homogeneous cross-sections is presented. This formula that is applied in Slovak Technical Standard STN 73 1401:1998 is compared with adequate formula that results from European Prestandard prEN 19931-1. Finally, the replacement of the interaction formula for the safe design of hybrid cross-sections and plate girders is suggested.

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