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Dynamic loads applied at concrete foundation

Dynamic loads applied at concrete foundation

Dynamic loads applied at concrete foundation

I have a concrete foundation which has a turbine (left side) and a generator (right side) on it. The loads from turbine have vibrating forces at frequency = 150 Hz, and the generator 30 Hz. There has been done a similar exercise earlier with a steady state modal analysis in Abaqus, but there was only vibrating forces at one frequency and not two as it is now.

When I have vibrating forces at two frequencies, can I just do two separate steady state modal analysis? I need to make sure the vibration speed is under 3 mm/s. Can I take the vibration speed in each seperate analysis (at the same point in foundation) and simply add them to check if its under 3 mm/s? - like a linear superposition you would do in a linear system.
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