[EN] FAQ 004784 | Why can I only calculate seismic loads in one direction when using RF‑/DYNAM Pro?

Question:
Why can I only calculate seismic loads in one direction when using RF‑/DYNAM Pro?

Answer:
You have probably selected too few mode shapes in the "Natural Vibration Cases" window of RF‑/DYNAM Pro. In this case, it may happen that the defined mode shapes do not vibrate in all directions and thus no mass is excited in these directions.

Therefore, you should calculate at least enough mode shapes to excite the required 90% of the mass in each direction in your calculation.

This is also described in more detail in the FAQ linked below.

For more information, go to the FAQ page:

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Keywords
#DlubalFAQ #ModeShape #NaturalVibration #Earthquake #Dynamics #Mass #ModalMassFactor #FrequentlyAskedQuestion #FAQAboutDlubalSoftware #QuestionAndAnswerToDlubalSoftware