Dear friends
I am following the SNAME method to estimate the DAF for jack up, based on 3 hours time domain random wave analysis.
As per SNAME, the DAF from overturning moment (OTM) should be higher than the DAF from base shear (BS). However, the 2 DAF from base shear and overturning I get from SACS are almost identical, even when the natural period of jack up (5.0s) are close to wave period (6.3s). I have tried many cases with different wave parameters and different natural periods, but DAF from BS and OTM are always the same.
Can anyone explain why is OTM DAF supposed to be higher than BS DAF in most cases?
And what might be the cause that SACS is producing results that give same DAF from BS and OTM?
Thanks!!!