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I design a simply symmetrical cross-section (T-section) and get the message "Poor Design: ER056) The general method can only be used for I-sections ". Why?

Answer

As the procedure according to 6.3.3 EN 1993-1-1 can only be applied for components with bending and compression for doubly symmetrical cross-sections, the add-on module complies with the general method according to 6.3.4 EN 1993-1-1. This method is applicable for arbitrarily single-symmetric cross-sections. In Germany, however, only I-sections are permitted, which is why the warning appears here.

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 also allow the general approach for non-I cross-sections in the "National Annex" dialog box, but you deviate from the National Annex.

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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