European Recommendations on the Stabilization of Steel ... - Xs4all

Annex 2: ExamplesANNEX 2: EXAMPLESThe calculated examples given in this Annex illustrate the calculation proceduresintroduced in the <strong>Recommendations</strong>. Examples 1 and 2 deal with the torsional restraintprovided by sandwich panels, examples 3 and 4 deal with the lateral restraint. Example 3 wasoriginally published in [34]. An additional example dealing with lateral restraint can be foundin [37].Example No. 1: Torsional restraint of a hot-rolled sectionSandwich roof panels are used to stabilize a purlin IPE200. The second moment of inertiaabout the weak axis of the purlin is 142 cm 4 . The purlin is loaded by a transverse load (selfweightand snow)q d = 3.7 kN/m (ultimate limit state)q d = 2.7 kN/m (serviceability limit state)which results in a bending moment. The purlin is installed as a multi-span-system with a spanof 6.0 m. The purlins have to be stabilized against lateral torsional buckling.For the sandwich panels, the following parameters apply:- Core material mineral wool, E Cc = 4 N/mm², E Ct = 6 N/mm², f Cc = 0.06 N/mm².- Steel faces with nominal thicknesses t F1 = 0.75 mm , t F2 = 0.63 mmThe purlin IPE200 has a width of the flange of b = 100 mm. The sandwich panel is fixed tothe upper flange of the purlin at every crest with a distance of 333 mm (n f = 3 m -1 ).Fig. A.4: Purlin, sandwich panel and details of fastening55