FAQ 004784 | Why do I only obtain the seismic loads calculated in one direction in the case of design with RF‑/DYNAM Pro?

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Why do I only get seismic loads calculated in one direction when calculating with RF-/DYNAM Pro?


It is likely that too few mode shapes were selected in the "Natural Vibration Cases" window in RF-/DYNAM Pro. Thus, it may happen that the defined mode shapes do not vibrate in all directions and therefore no mass is excited in these directions.

Therefore, you should calculate at least so many mode shapes that the required 90% of the mass is excited in each direction in your calculation.

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


Dlubal FAQ Mode shape Natural vibration Earthquake Dynamic analysis Mass modal mass factor Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal


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  • Updated 10/28/2020

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