XS_CALCULATE_POLYBEAM_LENGTH_ALONG_REFERENCE_LINE

Modified: 26 Mar 2026 Tekla Structures 2026

XS_​CALCULATE_​POLYBEAM_​LENGTH_​ALONG_​REFERENCE_​LINE

Category in Advanced options dialog: Dimensioning - unfolding

Use this advanced option to calculate polybeam length along the reference line instead of the center line. By default, Tekla Structures measures polybeam length along the center line of the beam, regardless of the Position in plane values of the beam.

Set this advanced option to TRUE to calculate polybeam length along the reference line. Set it to FALSE (default) to calculate along the center line.

When this advanced option is set to TRUE, Tekla Structures ignores all unfolding parameters defined in the unfold_corner_ratios.inp file. However, this only affects polybeams with straight sections. The length of polybeams with curved chamfers is always controlled using unfold_corner_ratios.inp.

This advanced option is model specific and the setting is saved in the options database. Reopen the model to activate the new value.

Note:

The center line option is always a safe alternative, because other modifications do not impact it. For example, if you calculate length using the reference line and you have used offsets to move the beam, the result may not be the true length of the beam.

Note:

When XS_USE_OLD_POLYBEAM_CALCULATION is set to TRUE, this advanced option is not used, even though results might be the same in most cases. To obtain reliable results, especially for Net Length, we recommend that you do not set XS_USE_OLD_POLYBEAM_LENGTH_CALCULATION to TRUE.

See also

Define unfolding parameters in the unfold_corner_ratios.inp file

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