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Fatigue of bolts in tension

Fatigue of bolts in tension

Fatigue of bolts in tension

(OP)
AS4100-1998 shows for a bolt in tension detail category = 36.
BS EN 1993-1-9 : 2005 (Eurocode) shows the detail category = 50
In most other cases both codes show the same detail category.

Does anyone have references that support one or the other of these values?
My opinion is that Eurocode is more recent and likely to be more accurate but can that be justified?

(I know Americans use a different design procedure and I'm not sure how that compares)

RE: Fatigue of bolts in tension

Hello,

if you refer the generals and also the notes to chapter 7 of EC, you'll see that this reference data is at least partially based on a probabilistic approach derived from test results, with respective probabilistic limit values given. AS does not give such input, and might already for this reason be more conservative. Elements under tension are always an area of primary concern with AS- based design (at least to my exp.). You may also encounter this conservative approach when analyzing extremal load cases. It is essential that you establish the required design base with your customer, if the project is @ downunder I'd however prepare for the AS requirements, as your design will be scrutinized by an independent authority.
Regards
R.

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