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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 shows the detail category = 50
In most other cases both codes show the same detail category.
Since Eurocode is more recent I would expect that value to be more accurate. Does anyone have any references that support that conclusion, or otherwise?

RE: Fatigue of bolts in tension

For comparison in NZS3404:1997 it was 36 (1997 version of the NZS3404 standard is virtually identical to AS4100 apart from additional seismic requirements), in the NZS3404.1:2009 replacement of the fatigue section they removed the bolts from the fatigue section altogether but I was never sure why. Could be due to the difference of opinion you have noted?

They also had this warning in the 1997 version which maybe why they removed it?

RE: Fatigue of bolts in tension

(OP)
Thanks Agent666. I know that it need not be considered for /T bolts but in telecommunications where I'm working we often have snug tight bolts of a variety of grades, from 4.6 to 8.8.

RE: Fatigue of bolts in tension

Just base it on 36, fatigue isn't something that you want to get wrong. The next size up of holding down bolts won't break the bank.

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