Effective width of Steel Flange Girders Related to Shear Lag Phenomenon
Tomme: 66 (70) Fascicle: 1 | 2020
Pages: 71-84
Abstract text:
In the conventional theory of bending, shear strains are neglected and the stress distribution can be determined from the Navier's equations. The term shear lag is related to some of the discrepancies between this approximate theory of the bending of beams and their real behaviour and refers to the increases of the bending stresses near the flange-to-web junctions, and the corresponding decreases in the flange stresses away from these junctions. In case of wide flanges of plated structures, shear lag may be taken into account by a reduced flange width concentrated along the webs in the direction of the action. When designing plated structures, the effects of shear lag, plate buckling and interaction of both effects should be taken into account at the ultimate, serviceability or fatigue limit states. In EN 1993-1-5, the concept of taking shear lag into account is based on effectives width of the flange which is defined in order to have the same total normal force in the gross flange subjected to the real transverse stress distribution as the effective flange subjected to a uniform stress equal to the maximum stress of the real transverse distribution. Aspects concerning the shear lag phenomena and two design examples of effectives width of the flange calculation and of the shear lag effects are presented in this paper.
Key Words:
plate buckling; shear lag effects; effective width; orthotropic deck; Eurocodes
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