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RE: truss bracing
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: truss bracing
- From: Charlie Carter <carter(--nospam--at)aiscmail.com>
- Date: Fri, 8 Dec 2000 09:27:33 -0600
Yura and Todd Helwig wrote and presented a seminar for SSRC and AISC
on stability bracing in steel structures. The principles would be just as
applicable to wood, right? The lecture notes for that seminar would
probably help you with this situation. If you do not have access to those
lecture notes already, I can help you get them.
I'm working on a 1930's era commercial building
with the following condition.
Arch trusses spanning 45'. Truss height is 7'-8"
at apex of arch. Spacing between trusses is 15.5'. There are 6 truss
Bottom chord of trusses were originally braced at
midspan with a rough sawn 2x6 running horizontally, truss to truss, and rough
sawn 2x6 in cross brace fashion running bottom chord of one truss to top chord
of next truss.
At some point in time a mezzanine was constructed
and the builder removed the cross bracing so it wouldn't be in the way of
people walking on the mezzanine. This occurs in two truss bays.
What criteria is there for bracing the bottom
chord of these trusses. At the two bays in which bracing needs to be replaced
I would like to keep as much mezzanine area unobstructed as possible. Bracing
at third points pretty much destroys the mezzanine space. I've thought of
bracing from the mezz. floor to the bott. chord of truss. Anyone have a reason
not to do this?
All thoughts will be appreciated.