FAQ 001485 IT

Calcolo DYNAM Pro - Equivalent Loads RF-DYNAM Pro - Equivalent Loads

Because I have to design a very irregular structural system for earthquakes, I would like to know if RFEM performs the so-called modal analysis (considering several mode shapes) automatically on the spatial system, or if it needs a special setting.

Risposta

The equivalent loads are determined according to the modal response spectrum method. To find out how many mode shapes must be considered, it is useful to calculate the equivalent mass factors in module window 1.6 additionally, because it is basically recommended to take as many modal shapes that the sum of the effective equivalent masses is at least 90 % of the effective total mass.

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RSTAB Analisi dinamica
DYNAM Pro - Equivalent Loads 8.xx

Modulo aggiuntivo

Analisi sismica multimodale con spettro di risposta e carichi statici equivalenti

RFEM Analisi dinamica
RF-DYNAM Pro - Equivalent Loads 5.xx

Modulo aggiuntivo

Analisi sismica multimodale con spettro di risposta e carichi statici equivalenti