FAQ 000244 FR

Calcul RF-DYNAM Pro - Forced Vibrations

In which case do I use which superposition expression for the modal response spectrum method?

Réponse

The complete quadratic combination (Complete Quadratic Combination, CQC) is used if in the analysis of spacial models with mixed torsional / translational eigenvectors there are adjacent mode shapes, whose periods differ by less than 10 %.

If this is not the case, the quadratic combination (SRSS) is used.

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RFEM Analyses dynamiques
RF-DYNAM Pro - Forced Vibrations 5.xx

Module additionnel

Analyse dynamique et sismique avec analyse de l'historique de temps et analyse multimodale du spectre de réponse