> > From: SMEZSEZ(--nospam--at)aol.com [SMTP:SMEZSEZ(--nospam--at)aol.com]
> > A325-X bolts were specified to be installed at steel to column moment
> > resisting connection in an OMRF. Instead, A325 friction type bolts
> > were installed, but were not torqued., but tightened well. The bolts
> > are presently inaccessible. Will the friction type bolts be accectable
> > without having to be torqued.
> From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
> I always get nervous when engineers say torqued in lieu of tensioned, but
> that is another issue.
> If the bolts were not tensioned, you do NOT have friction bolts.
I always get nervous when engineers attibute assembly conditions to the
properties of the bolt ... friction bolt!? ;-)
> for moment resisting connections. Generally moment frames are made with
> slip critical (friction) connections. You should be able to check the shop
> drawings to see if the threads will be in the shearing plane.
This sounds like a moment end-plate connection. It is hard to imagine
that bolt shear is the controlling condition in the design (X vs SC
type). I can imagine some situations where fully tensioned bolts may not
be required in a moment connection but it would be too much work to
prove that. If the A325 bolts were supplied correctly (threads X-cluded)
then they are OK. It's unfortunate that the tensioning was not specified
on the drawings and there may be a claim by the contractor. So, just
Paul Ransom, P. Eng.
Burlington, Ontario, Canada