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RE: Bridging for bar joist[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Bridging for bar joist
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Wed, 28 Oct 2009 18:50:44 +0000
Ultimately what you are doing with bridging is stabilizing the various compression elements in the assembly that make up a bar joist. By way of example: a deep long span bar joist can flip over just by its own weight. |
The X bracing may provide an "anchor point" for the horizontal bridging. But an X brace WITH horizontal bridging is more positive and precludes the need for attaching the bridging to the wall. I recently started this practice in about 1977. I added up all of the costs for this since 1977 and it added up to zero dollars. That is twice my beer bonus for the year.
Regards, Harold Sprague
Subject: RE: Bridging for bar joist
Date: Wed, 28 Oct 2009 10:28:25 -0700
Thank you for your responce. I have older Vulcraft standard Details that shows bridging both ways, attached to wall and X braced. I prefer not to attach to wall because of no coordination between bridging location and panel joints and some panels are heavly reinforced which would require core drilling. Also if this was a steel building with spanderal beam i would think X bracing of bridging required.
So does X-bracing provide positive anchorage as required in SJI?
Date: Wed, 28 Oct 2009 12:16:01 -0400
Subject: Re: Bridging for bar joist
My guess is that there is a misunderstanding. You do not use braces to provide positive anchorage. They stabilize, not anchor. It's now standard (page 33 of the '03 Vulcraft Catalog) to provide horiz bridging in the bay adjacent to a much stiffer element such as a wall. What sort of concrete panel is it? Could it be that the joist manuf thinks the bridging will be used to stabilize them? Are the panels more of a cladding than a support?
On Wed, Oct 28, 2009 at 11:50 AM, Kipp Martin <KMartin(--nospam--at)carollo.com> wrote:
Windows 7: I wanted more reliable, now it's more reliable. Wow!
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