Looking in the 13th & 14th edition of AISC, for the most part, it doesn't really matter what your yield strength is under fatigue loads. IOW, going from 36 ksi to 50 doesn't really help under most circumstances. But how about going to something like Grade 105? If you (for example) were in a situation like Case 8.5(a) (see table A-3.1, p.16.1-177 in the 13th edition)......I would think you would have a somewhat higher threshold stress than 7 ksi.
Does anyone know of a way to deal with it.....or are you stuck trying to hunt down S-N curves outside the code.
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