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Frequently Asked Questions (FAQ)
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The reason for this warning is that sets of members are designed by default according to General Method 6.3.4 of EN 1993-1-1. However, this method is only allowed for loading in the support plane, that is, without transverse bending moment. Therefore, the corresponding warning appears.
You can perform a stability analysis according to the second-order analysis as a cross-section design that is possible with the add-on modules RF- / FE-LTB or RF- / STEEL Warping Torsion.
Alternatively, you can neglect the lateral bending in the filter options of the "Details" dialog tab, tab "Stability" or activate the extended method according to Naumes in the "National Annex" dialog box, which allows for transverse bending.
In this case, however, the best option is to select the equivalent member method for the design of the sets of members in the "Stability" tab of the "Details" dialog box.
That's right, both add-on modules count on the 7th. Degree of freedom, warping.
The difference is that in RF- / FE-LTB, only the loads acting directly on the set of members are automatically detected. Loads from other structural components that are indirectly effective on the set of the RFEM implementations must be added manually as Extra Loads. In RF- / FE-LTB, a complete recalculation of the structure takes place.
RF- / STEEL Warping Torsion on the other hand analyzes the internal force diagrams from the calculation of the main program and then calculates the loads back. They will be newly applied and calculated. Thus, the input of the loading is omitted, which means a time saving.
The length L T represents the effective length for torsional buckling and lateral-torsional buckling under the axial concentricity. The length L T functions analogously to columns D and G: A torsional buckling and lateral-torsional buckling load is calculated for the design of a pure compressive force according to EN 1993-1-1, clause 184.108.40.206.
The length L W, however, is no effective length but the length to which the distribution of moments and shear force is related with the boundary conditions k z and k w (columns J and K) as well as the lateral intermediate supports. This length should i. d. R are not changed.
No, they are not. No stability analyzes for lateral-torsional buckling are carried out in the RSBUCK add-on module.
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