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Machine foundation-dynamic force

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Hi all,
I have checked that natural frequencies of foundation and of machine are apart by atleast 20 percent. Also, amplitudes have been checked against permissible amplitudes by using Barkan's method.
However, for static analysis of Machine foundations, how the amplification in the dynamic force can be considered with respect to natural frequencies of the foundation and excitation frequencies of the machine.
Please help.
Thanks in advance,

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