Transverse stiffeners in plated girders are usually designed as rigid, preventing any interaction between adjacent panels. To assure this, the intermediate transverse stiffener must have sufficient ...rigidity to maintain zero lateral deflection along the line of the stiffener. To simplify the design rule and to evaluate the actual action of tension field on transverse stiffeners, a numerical parametric study was performed. The idea is to simplify the design of intermediate transverse stiffener only on stiffness requirement, which is much more practical than checking the maximum stresses and out of plane displacement of the transverse stiffener due to the effect ofdeviation forces and tension field action on the geometrical non-linear model. The parametric study performed, in this paper, takes into account all possible load cases, such as: deviation forces only (only normal stresses in the web), tension field action only (only shear stresses in the web) and interaction of both effects (normal stresses and shear stresses in the web plate). The numerical model was built in Abaqus using shell elements. To obtain the most unfavourable results, sensitivity imperfection analysis was performed. On the basis of the sensitivity analysis three most unfavourable imperfection shapes were included in an extended parametric study. The material used in the parametric study was elasticplastic with a nominal plateau slope. The yield stress was set to 355 MPa (S355) and 235 MPa (S235). The results of the numerical analysis showed that the main parameters that influence the required stiffness of the stiffeners are: initial imperfections and initial imperfection amplitude, the level of post-critical resistance and deviation forces. It has been demonstrated that for pure shear the axial forcein the stiffener coming from tension field theory is very small, less than 20% of force given in EN 1993-1-5. It has been shown that the EN 1993-1-5design rule based on the axial force from the tension field theory andthe AASHTO design specification turns out to be conservative. On the other hand, if the minimum stiffness requirement given in EN 1993-1-5 is used to de-sign the transverse stiffeners, most of the stiffeners are too small. Basedon numerical results a new design rule which is based on the minimum stiffness requirement is proposed. The new rule provides a necessary second moment of inertia of the stiffener, which fulfils the stress and strain requirement for rigid transverse stiffeners.
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