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fatigue stress category of riveted built-up members

fatigue stress category of riveted built-up members

fatigue stress category of riveted built-up members

(OP)
hello,

I've been doing extensive research related to this issue, I am assessing a riveted steel railway bridge, making use of AREMA code.
The issue I faced was that there is no clear stress category for riveted built-up sections: it only gives for welded bult-up section
(category B to E), and also gives cateogry for riveted connections (category D), I was wandering what category to use in riveted
built-up sections since they have much more redundancy when compared to the riveted joints.

I should still use category D, or as suggested by some papers use category C?

RE: fatigue stress category of riveted built-up members

I was involved with something similar recently: Fatigue analysis of riveted floorbeams for vehicular loads.

There's research that suggests the fatigue category should be C. However, AASHTO Standard Specs require Category D - but this is for new designs. The sample example, 2.3, in LRFD doesn't mention rivets but it's still Category D. AASHTO's Bridge Evaluation Manual permits Category C for existing structures.

The project I was on ended up using Category D because technically (or perhaps legally is more appropriate term) the BEM is not a specification.

Theoretically, if you replace (certain) rivets with high strength bolts the fatigue life problem goes away because you reset the clock using Category B.

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