When determining the effective cross-section values according to EN 1993-1-1, EN 1993-1-5 or EN 1999-1-1, SHAPE-THIN displays the warning that the effective widths will only be determined for straight members. What does it mean?


The cross-section class is defined according to EN 1993-1-1 and EN 1999-1-1 by the maximum width/width ratio c/t or b/t of the cross-section parts subjected to compression. EN 1993-1-1 or EN 1999-1-1 only list different straight c/t or b/t parts. Therefore, a classification and a determination of the effective widths is not carried out for curved c/t or b/t sections.


Classification Effective width Effective width Straight element Curved element

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Cross-Sections Thin-Walled

Cross-Section Properties Software

Section properties, stress analysis, and plastic design of open and closed thin-walled cross-sections

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