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Frequently Asked Questions (FAQ)
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The reason for the warning is that tapered cross-sections can not be designed with method 6.3.3 of EN 1993-1-1. The RF- / STEEL EC3 add-on module shows these cross-sections according to General Method 6.3.4 of EN 1993-1-1. However, this method is only allowed for a loading in the support plane, that is, without a transverse bending moment. Therefore, the warning appears.
You can perform a stability analysis according to the second-order analysis as a cross-section analysis that is possible with the RF- / FE-LTB or RF- / STEEL Warping Torsion add-on modules.
Alternatively, you can neglect the lateral bending in the filter options of the "Details" dialog tab, "Stability" tab, or activate the extended method according to Naumes in the "National Annex" dialog box, which allows for transverse bending.
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