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The effective cross-section properties for Class 4 sections are determined according to EN 1993-1-5 art. 4.3 & 4.4.
For a detailed overview of the effective section calculation reference is made to "Effective Shape".
The Cross-section requires an Initial Shape in order to calculate the Effective Shape and Effective Properties.
Aeff is the effective area of the cross section when subject to uniform compression.
Weff is the effective section modulus of the cross-section when subject only to a moment about the relevant axis. The fibre distance is taken from the new centroid to the furthest fibre in the gross shape, this is limitation of the current implementation because the correcter approach would be to use the furthest fibre distance of the effective shape.
eN is the shift of the relevant centroidal axis when the cross section is subject to uniform compression.
Additional moments ΔMEd due to the possible shift eN of the centroid of the effective area Aeff are accounted for according to EN 1993-1-1 art. 6.2.2.5(4). These additional moments are neglected in case they would have a favourable effect on the check result.
CHS members with Class 4 cross-sections are checked as elastic, Class 3.