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Earthquake Oscillation

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JoSpencer

Geotechnical
Feb 4, 2016
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Hi all, thank you for the help in advance.

I have a square mesh in which I have inflicted a prescribed displacement to the central node in order to cause an earthquake type movement. My mesh is supposed to represent a square sample of soil.
I applied a decay amplitude to this prescribed displacement, but whenever I try to get results from it, the displacement-time graph comes out as linear. Does anyone know why this is? I was expecting almost an exponential decay as the energy dissipates.

Any help would be much appreciated - thank you!
 
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