Buckling Behavior of Stiffened Plate under Biaxial Compression and Shear

The structural elements in steel and composite bridges are sensitive to stability problems due to their large dimensions. Mainly, resulting elements are thin plates falling under the design requirements provided by EN1993-1-5. Due to the results of recent scientific papers regarding the unstiffened plates under biaxial stress, the review of the buckling proof formats for stiffened plates under biaxial loading was needed. The article gives an overview of buckling proof formats according to EN 1993-1-5 for steel and composite bridge and it is limited to the usual method of reduced stresses in Germany. For a given example, this paper discusses whether the proposed approach in the literature is also appropriate for the case of stiffened panels. One method for the buckling verification according to the effective width method of plates under biaxial compression and shear will be proposed.