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No, in ANSYS 11.0 the PSD method utilizes unit displacements at the fixed supports and that isn't possible when the model is supported on joints. To run a PSD analysis it would be necessary to connect the body-to-body spherical joints to a dummy body and the apply the fixed support to the dummy body. In ANSYS 12.0, the method utilizing a static analysis of unit displacement constraints is replaced with a mathematical computation of the participation factor for uniform base excitation, so this workaround may not be necessary at 12.0.
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