FAQ 000242 EN-US

Add-on Modules RF-DYNAM Pro - Natural Vibrations RF-DYNAM Pro - Equivalent Loads RF-DYNAM Pro - Forced Vibrations

How many mode shapes do I need to consider in the dynamic analysis?

Answer

In principle, you need to consider so many mode shapes that the sum of the effective modal masses (that is, for a normalization of Mi = 1, the sum of the quadrats of the involved factors) is at least 90 % of the effective total mass.

For this, it is also useful to also calculate the equivalent masses in Window 1.1 General Data.

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RFEM Dynamic Analysis
RF-DYNAM Pro - Natural Vibrations  5.xx

Add-on Module

Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models

Price of First License
1,030.00 USD
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

Price of First License
760.00 USD
RFEM Dynamic Analysis
RF-DYNAM Pro - Forced Vibrations 5.xx

Add-on Module

Dynamic and seismic analysis including time history analysis and multi-modal response spectrum analysis

Price of First License
1,120.00 USD