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I design a set of members with a uniform, double-symmetrical cross-section and receive the warning "Not Applicable: ER051 Moment about axis z on non-symmetric cross-section, tapered member, or set of members ". Why?

Answer

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.

Keywords

General method transverse bending replacement rod method ER051 steel construction Eurocode 3 EC3 II. Order rod set rod set design stability proof of stability non-measurable warning

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Design of steel members according to Eurocode 3

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