Fatigue of bolts in tension

[sdz]

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?

 

[Agent666]

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?

 

[sdz]

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.

 

[Agent666]

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.