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RE: Decoupling of anchor bolts

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Makes sense.  Great thought about the lateral drift.  Thank you .  


******** original message ********

Unless the shear force is small, I do not resist shear with anchor
bolts.  Any time that I have a significant tensile force in anchor
bolts, I require them to be pretensioned.  And any time I have a
pretensioned anchor bolt, I require the shafts to be greased and taped
to preclude bond.  


Generally we do not account for the contribution in the stretch of an
anchor bolt to lateral drift or deflection of cantilevered columns or
braced frames.  It can be significant.  If you pretension the anchor
bolts you eliminate the stretch contribuition to drift of the anchor


I have done this for buildings, power plants, machine bases, etc.

Harold Sprague

> Date: Sun, 20 Jan 2008 11:18:37 -0800
> From: markajohn(--nospam--at)
> Subject: RE: Decoupling of anchor bolts
> To: seaint(--nospam--at)
> Harold,
> What applications do you do this for? Just large bolts with little or no shear
> force?
> I have been thinking about anchor bolts more than usual
> after following the list this past week. 
> BTW, thanks to all who wrote about anchors etc. recently!
> Thanks,
> MJ

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