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In an older model in RFEM 4 or RSTAB 7, I designed a DuenQ cross-section or general cross-section in STEEL EC3. At that time, a cross-section class 1 or 2 was determined. Now I have opened the model in RFEM 5 and now the cross-section is only classified Class 3 or 4. What is the reason for this? Was the design more economical at the time?

Answer

The design of general cross-sections or DuenQ cross-sections is always performed elastically in STEEL EC3, which means according to Class 3 or 4. Since the conditions of interaction are restricted to some cross-sections, no plastic design is possible for any cross-section shapes. In RFEM 4 or RSTAB 7, however, it was possible to classify a cross-section as class 1 or 2, even though the subsequent design was carried out elastically.
To eliminate this ambiguity and to create consistency, the classification has also been changed to cross-section classes 3 and 4.

Keywords

Steel structure Eurocode 3 RFEM4 RSTAB7 Classification EC3 Cross-Section Classification Elastic Plastic

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STEEL EC3 8.xx

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