Import of Stiffness Modifications

Tips & Tricks

In RF-/DYNAM Pro - Natural Vibrations, it is possible to import axial forces and stiffness modifications from any Load Case (LC) or Load Combination (CO). You can modify material, cross‑section, member and surface properties and activate those modifications in the LC/CO calculation parameters.

It is also possible to import stiffnesses from RF-/CONCRETE. Members or surfaces can be deactivated to analyze a modified structural system in RF-/DYNAM Pro. Axial forces and failing members are imported from the set LC/CO.

All stiffness modifications are initial conditions for the eigenvalue analysis performed in RF‑/DYNAM Pro. There, a linear calculation is performed.

When you want to consider axial forces only (for example prestress in cables or consideration of the P‑Delta effect) make sure that no stiffness modifications are activated in the calculation parameters of the imported LC/CO.

When you want to study certain stiffness modifications or deactivated members only, make sure you create a LC containing no loads but the stiffness modifications you are interested in.


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  • Updated 4 January 2021

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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