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fatigue analysis in riveted bridge

fatigue analysis in riveted bridge

fatigue analysis in riveted bridge

(OP)
Hello,

I am currently assessing an existing riveted steel railway bridge. I have some doubts regarding fatigue check, Im using AREMA code for this analysis.
From the AREMA code, and given that Im dealing with riveted bridge, that means category "D", I obtain some limiting values Srfat for the stress range.
My query is that, it says that the kind of stress that it contemplate is tension(T) or T/C, and doesnt say anything about shear or flexural stresses and so:

When verifying floor-beam whose principal stress is due to flexure, in this case I determine the stress range as (delta M)/ W and compare this to Srfat?, (deltaM) I mean algebric difference between max M and
min M, or I should decompose the moments in T and C by M/z = T=C , and then determine the range stress as delta T/ Sn?

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