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Fatigue check in railway bridge

Fatigue check in railway bridge

Fatigue check in railway bridge

(OP)
Hello,

I am currently verifying 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:

1) 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?

2) when checking the connection between floor-beam and principal beam, the principal stress is shear, and so I compared the delta shear/ Sn to Srfat?

Thanks!

RE: Fatigue check in railway bridge

I'm not sure what you mean by "verifying" the riveted railway bridge. I assume that the bridge is a riveted plate girder structure, and you are trying to assign a safe load to it, yes? If so, then don't count on theoretical analyses to assign such a number. You cannot know, without some selective destructive testing, what is the condition of the rivets, and the holes around them. If the girders are riveted, then they are likely at least 40 years old, or more (probably 50 years or more). I would do load testing on this bridge and measure the deflections produced to try and establish a safe working load for this structure.
Good luck,
Dave

Thaidavid

RE: Fatigue check in railway bridge

I would think that one aspect of your analysis would be a thorough inspection of the bridge by testing steel thicknesses, soundness of the rivets, examining condition of abutments walls, appearance of joints, etc...

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