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Bending and Axial Compression

For determining the Combined Bending and Axial Compression check according to EN 1993-1-3 art. 6.2.5 EN 1993-1-3 allows two possibilities:

• Use the EN 1993-1-1 interaction according to article 6.3.3
• Use the alternative according to EN 1993-1-3 article 6.2.5(2)

The choice between these two methods is set in the Steel Setup.

Interaction according to EN 1993-1-1

The interaction is executed according to EN 1993-1-1 art. 6.3.3 using interaction factors from Annex A & B.

In both Method 1 (Annex A) and Method 2 (Annex B) the cold - formed sections are seen as ‘class 3 or 4’.

Alternative interaction according to EN 1993-1-3The interaction is executed according to EN 1993-1-3 art. 6.2.5(2).

N_b,Rd is taken as the lowest value of

• the flexural buckling resistance about the y-y axis
• the flexural buckling resistance about the z-z axis
• the torsional (-flexural) buckling resistance

Formula (6.36) includes the strong axis bending resistance M_b,Rd. There is however no indication for a weak axis bending moment. Therefore, in case a weak axis bending moment is present, this interaction cannot be applied and the general interaction according to EN 1993-1-1 is applied.

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