Derive the distribution of forces in a volume element for all instants of time

Question

Hello, everyone,
I am interested in deriving force-displacement or moment-rotation diagrams of a foundation element (modelled as a volume element) in a dynamic analysis with plaxis 2D or plaxis 3D. I was thinking of introducing a dummy interface or plate acting as an integrator of the force distribution. Is it possible to integrate the entire force distribution in a volume element (the foundation in this case)? How can this be achieved for all time instants of an earthquake?
Any advice is welcome.
Thank you

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Stefanos Papavasileiou · Answer

Dear Fausto, 
 Provided I understand the problem you describe, a dummy plate could be used to capture the structural forces of the volume elements. However, please keep in mind the limitations and possibilities when using a dummy plate as an approach. On a different topic, the subject of the dummy plate approach is explained here: Composite liner approach in PLAXIS 2D 
 When it comes to time steps of a dynamic calculation, in such case you would need to save all the calculation steps before running the analysis. Then, you would extract the results per step from the tables or via the command line in an efficient way or even with Python scripting in an efficient and automated way. 
 Some interesting articles about this: 
 
 How to setup the number of steps stored in PLAXIS Input 
 Inspect intermediate step results in PLAXIS Output