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I design a tapered beam and get the message "Not Applicable": ER051 Moment about axis z on non-symmetric cross-section, tapered member, or set of members ". Why?

Answer

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 loading in the support plane, that is, without transverse bending moment. Therefore, the warning appears.

You can perform a stability analysis according to the second-order analysis as a cross-section design, which 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.

Keywords

Cross Bending Replacement Rod Method General Procedure Naumes Rod Set Bollard Voute Proof of Stability Eurocode 3 EC3 Momentum about axis z ER051 Unmeasurable Warning

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RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD
RFEM Steel and Aluminium Structures
RF-STEEL EC3 5.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD