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I design a set of members with a uniform, double-symmetric cross-section and get the message: 'Non-designable: ER051) Moment about z‑axis on asymmetric cross-section, taper or set of members'. Why?

Answer

The reason for this warning is that sets of members cannot be designed according to General Method 6.3.4 of EN 1993-1-1 by default. However, this method is only allowed loading in the support direction, that is, without the transverse bending moment. Therefore, the corresponding warning appears.

You can perform the stability analysis as cross-section design according to the second-order theory, which is possible by using the add-on modules RF-/FE-LTB or RF-/STEEL Warping Torsion.

As an alternative, you can neglect the transverse bending in the filter options of the 'Details' dialog box, the 'Stability' tab, or activate the adapted method according to Naumes in the 'National Annex' dialog box, which enables transverse bending. The use of these two options is at the discretion of the user.

In this case, however, the best option is to select Equivalent Member Method for the design of sets of members in the 'Details' dialog, the 'Stability' tab.

Keywords

General Method Transverse bending Equivalent member method ER051 Second-order analysis Set of members Design of sets of members Stability Stability analysis Non-designable

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