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Boundary Conditions in Soil

Boundary Conditions in Soil

Boundary Conditions in Soil

(OP)
Dear colleagues,

I'm performing a 2D analysis on my linear soil model, to which I inserted an excitation ( amplitude) as a boundary condition for my model's base nodes.
When I ask the time history output of Acceleration at my base nodes, the time series I'm getting for a specific base node is different than the time series of the amplitude.

Shouldn't those two be the same given that I inserted the amplitude as a boundary condition for my models base nodes?

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