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The Axial Compression Check is executed according to EN 1993-1-3 art. 6.1.3.
The choice between formula (6.2) and (6.3) is made by comparing the gross area Ag from the initial shape with the effective area Aeff of the effective shape for compression.
The gross area Ag used in the formulas is taken from the cross-section manager.
This comparison using the initial shape property is of importance for the following reasons:
- Profile Library sections can have different gross properties compared to the initial shape since the gross properties come from certain sources (books, tables, …) and are mostly rounded off.
- For general cross-sections the gross shape can differ from the initial shape since the initial shape concerns a thin walled representation.
Each element on which a distortional buckling reduction factor χd is applied is seen as ‘stiffened’.
All other elements are seen as ‘plane’.