Fatigue calculations

Hello friends,

I'm an internship in a Offshore Oil and Gas service and supply company and I started working with SACS recently. I have a question concerning fatigue analysis:

What are the steps to follows to do a time history fatigue analysis knowing that i have a force time history file of  3 hours ( just for wind ) , and i chose a JS spectrum for the wave response input.

These are the steps i followed but i had abnormal results:

1- Static Analysis (create a pile head superelement)
2- Dynamic analysis (extract mode shapes)
3- Dynamic analysis (Time history wave wind ,force)
4- Post processing (Time history fatigue)

regards,

Marwane

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