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h1. How are initial free-vibration conditions applied to the beginning of a time-history analysis?

*Extended Question:* I am interested in subjecting a SAP2000 model to an initial displacement and velocity at the start of a time-history analysis. Is this possible and how would it be done?

*Answer:* The initial conditions of a time-history [load case|kb:Load case] may either be zero, or may continue from the end of a previous [nonlinear|kb:Nonlinear] analysis. Initial free-vibration conditions would have to be induced in the previous case before that state carries over into the [time-history|kb:Time-history analysis] analysis.

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*Related Incident:*
* 21646
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