Instead of an equivalent static analysis do a response spectrum analysis. Turn on the SAVE option in response spectrum loading input, which would save the joint accelerations in a file with model_name.ACC. This file would be created in the same folder as your model and you can open it using notepad or wordpad. From that file you will be able to get the acceleration at the support nodes of the equipment. For more details on the SAVE option, please refer to the section 5.32.10.1.1 of the Technical Reference.
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