Thanks for your response, I thought the same, but I also feel that this information could apply for a "regular metal S-N curve". What if by employing a metal curve I exceded the yield strength in compression, then I shouldn't employ the alternating stress? Do you have any thoughts on this?
I have found a fatigue S-N curve for concrete in a Danish code in order to evaluate a concrete wind tower under fatigue cycles. Most of the literature I have read for fatigue refers to metals, S-N curves have an alternating stress in the vertical axis and the cycles number in the horizontal...
