B. TECHNICAL

10. Dimensioning of columns

When dimensioning columns, the static model of a multi-part compression member of the lattice or frame-stanchion type is assumed. As with bending girders, the normal force is distributed only to the flanges. The corrugated web serves only to transfer shear forces between the flanges. Allowance must therefore be made for the shear flexibility of the web when verifying buckling in the direction of the "strong" axis (equivalent to the non-material axis in the case of multi-part compression members), eg. by introducing ideal slenderness.

   with    and

The buckling test at the "weak axis" and the torsional-flexural buckling verification may be carried out, to be on the safe side, on the "isolatet" flange resorting to Table 2.