How can I consider prestressed cables in RF‑/DYNAM Pro?

Answer

The prestress of cables has a governing influence on the behavior of the structure. Therefore, it must also be considered in the dynamic analysis.


In the natural vibration cases of the add-on module, it is possible to consider stiffness modifications on the basis of a load case. This option allows you to rewrite the geometric stiffness matrix for the natural vibration analysis. In order to avoid the falsification of the results or to consider any unwanted effects, it is important to only include the prestress and no further loading in the load case to be imported.


If you want to perform the time history analysis, make sure that the implicit Newmark analysis and the explicit analysis do not use the natural vibration cases, but that the calculation parameters are defined directly in the dynamic load case. Therefore, it is also necessary to consider the prestress. For this, the "Stationary State" feature is available. This option allows you to consider the stiffness modifications resulting from the prestress.


There is also an interesting technical article about this topic.

Keywords

Prestress Prestressed Cable Dynamics Time history Natural vibration

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