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001023
2015-05-06

Import of Stiffness Modifications

In RF-/DYNAM Pro - Natural Vibrations, you can 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 these modifications in the LC/CO calculation parameters.

You can also 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 LC/CO set.

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

When you want to take into consideration 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 an LC containing no loads but the stiffness modifications you are interested in.

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