Anmerkungen zum Stabilitätsnachweis längsversteifter Platten unter biaxialem Druck

Remarks on the stability verification of longitudinal stiffened plates under biaxial compression. By using the Ritz method, the buckling of plates with longitudinal stiffeners exposed to biaxial compression is discussed. When limiting the deflection of the longitudinal stiffeners analogously to clause 9.2 of DIN EN 1993-1-5:2010 for transverse stiffeners, the buckling verification of the stiffened plate according to Eq. 10.5 of the code can be replaced by the verification of the relevant subpanel and the stability verification of the longitudinal stiffeners taking the additional stresses and deformation due to the compression in transverse direction into account. The example of the stability analysis of bottom chord of a box girder bridge during incremental launching shows that the verification against buckling according to Eq.10.5 of DIN EN 1993-1-5:2010 cannot replace the mentioned stability analysis of the longitudinal stiffeners. Using the example of the web of the box girder, it is shown that a design according to Eq. 10.5 may in some cases also lead to inefficient results.