Combination Rules when Considering Accidental Torsion

Tips & Tricks

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If random torsions are considered in RF-/DYNAM Pro - Equivalent Loads, the module exports two load cases for each eigenvalue: once with a positive torsional moment, in the other case with a 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 alternative group, using OR. Here it is important to note, that the absolute values of the considered results are used for comparison.

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

Formulas and an example are provided in the figure.

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RFEM Dynamic Analysis
RF-DYNAM Pro - Equivalent Loads 5.xx

Add-on Module

Seismic and static load analysis using the multi-modal response spectrum analysis

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