Export of Response Spectrum
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Response spectrum Export response spectrum Import response spectrum
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Features of the Modal Analysis Add-on for RFEM 6
The dynamic analysis in RFEM 6 and RSTAB 9 is divided into several add-ons. This article will show you some of the main features of the Modal Analysis Add-on for RFEM 6 / RSTAB 9.

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Modal Analysis | Neglecting Masses
It is often necessary to neglect masses, especially when the output of the modal analysis is to be used by the seismic analysis, where 90% of the effective modal mass in each direction is required for the calculation. Thus, you can neglect masses in all fixed nodal and line supports so that the program will automatically deactivate the masses associated with them, but you can also manually select the objects for which the masses should be neglected in the modal analysis. The latter is shown in the image, where a user-defined selection is preferred, and the objects as well as their associated mass components are selected to neglect the masses.
- Is the German National Annex 2021‑07 to Eurocode 8 available in RFEM 5 / RSTAB 8?
- How can I neglect masses in my modal analysis in RFEM 6 / RSTAB 9?
- How can I analyze the failure of an object, such as a column, in my modal analysis?
- Where can I adjust the standardization of a mode shape in RFEM 6 / RSTAB 9?
- Why do the results in a modal analysis differ between the initial prestress and the surface load?
- How can I display mode shapes in RFEM 6 and RSTAB 9?
- How can I perform an earthquake analysis in RFEM 6 and RSTAB 9?
- RF‑/DYNAM Pro - Forced Vibrations and RF‑/DYNAM Pro - Equivalent Loads perform the multi-modal response spectrum analysis. What are the differences?
- There are two different add-on modules for a response spectrum analysis in RF‑/DYNAM Pro. What can be the reasons for the different results of both add-on modules?
- What is the meaning of the superposition according to the CQC rule in a dynamic analysis??