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001118
2015-10-01

Combination Rules when Considering Accidental Torsion

When accidental torsion is considered in the RF-/DYNAM Pro - Equivalent Loads module, the module exports two load cases for each eigenvalue: one with positive torsional moment, the other with negative torsional moment. The generated equivalent loads themselves do not differ in these two load cases.

Load cases exported from RF-/DYNAM Pro are combined with the SRSS or the CQC rule. The two torsional load cases have to be combined as an alternative group, using OR. It is important to note here that the absolute values of the considered results are used for comparison.

The "equivalent linear combination" also works when accidental torsion is considered. Therefore, the alternative combination has to be applied when calculating the f factors used for the "Preserve Sign" option.

Formulas and an example are provided in the figure.

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