Tow Fatigue - How to count for structural natural frequencies?

Dear Sirs,

I'm doing spectral fatigue for Topside modules of a floating structure using Tow Fatigue. I have tried someway to include the effects of natrual frequencies of the structures into their responses but it seems that SACS does not support such dynamic effects. Please advise the current calculation procedure of TOW FATIGUE? Is there any way to count for such thing?

Thanks & Regards,

HoanVV.

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