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[FAQ]

You can do two separate modal (each with less than 10,000 modes) and two separate spectrum analyses based on the modal analyses and then SRSS combine the results. To capture the full modal range, you need to request 10,000 or fewer modes in the first modal analysis and specify the end frequency (FREQE) from the first modal analysis as the beginning frequency (FREQB) for the second modal analysis. You then need to do two separate response spectrum analyses based on the two separate modal results. After each spectrum analysis, you can use RAPPND to write the results to an rst file. Finally, you can use a load case combination to SRSS the results from the two response spectrum analysis to calculate the combined result for the full modal range. You can use the FILE command to toggle between the two spectrum rst files within /POST1.