D.5.B.14.2 Bending and Axial Force Interaction
For Class 1 and Class 2 cross sections, along with the conditions mentioned in Cl: 6.2.9.1 of EC3, the Dutch National Annex includes another clause specific to Class 1 and Class 2 round hollow sections.
The bending and axial force interaction for Class 1 and Class 2 round hollow sections may be checked using both of the following formulas:
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