Is there a way to re-use the reduced matrices so solve 2 or more loading histories in a reduced transient analysis in ANSYS 11.0?

No, but a good workaround would be to use a CMS Superelement to do the matrix reduction and that could be re-used in a full transient. An advantage of this approach is that a CMS Superelement will provide a more accurate dynamic representation of the reduced structure than the Guyan Reduction used in a reduced transient. Also, a CMS Superelement can be generated using the Sparse solver, which is at least 10x faster than the frontal solver used to perform the matrix reduction in a reduced transient.

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