Rational Dimensions of Transverse Stiffenning Ribs in Girders with a Slender Web

Abstract

In thin-walled structures, to which girders with slender web (GSW) are related, one of the weak links is their local stability. Girders with slender web are still buckling in elastic stage of loading under shear deformation. Increasing of their stability is possible to reach with installation of Analysis carried out in the work show that demands to appointment of optimum sizes of transverse stiffening ribs in Russian structural standard differ essentially from those of the foreign standards. The goal of the work is to find out the demands by which the standards are more well grounded and bring in suggestion on improving the Russian structural rules. The determined goal has been reached with GSW panels calculations FEM using the program complex ANSYS. The critical loads were determined in the shear of rectangular plates supported by transverse stiffening ribs of different sizes. The results of the FEM were compared with the calculations performed on the empirical dependencies of different standards. The result of the research was to make recommendations on the rational dimensions of the stiffening ribs, determined from the ratio of flexural stiffnesses of the reinforced plate and rib. It is noted that the presence of stiffening ribs can increase the stability of the beam wall by 15-30%. The results of the research can be used in design organisations.