TU - Gesamtverschiebung
U - Verschiebung relativ zur Anregungsstelle
"The values of nodal solution variables U, V, and A in modal dynamics in the time domain are relative to the motion of the primary base. Hence, the sum of the relative motion and the base motion of the primary base yields the total motion; this total motion is available by requesting output variables TU, TV, and TA. In the absence of primary base motions, the relative and total motions are identical."
Users Manual 6.3.7 Transient modal dynamic analysis
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