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RE: Firewall construction

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Have you done a single cantilevered wall that cantilevers about 36 feet?
I believe that this would be a rather hefty wall for even an internal
pressure of 5 or 10 psf, not to mention if the wall should be designed for
an external wind pressure for situations AFTER one side has fallen down.
My gut was telling me that a single wall is not a feasible option, but I
know the PM will question my gut, so I was "covering my bases".


Scott Maxwell, PE, SE

On Wed, 28 Jun 2000, Sprague, Harold O. wrote:

> Scott,
> The 2 general types of fire resistant walls are fire walls and area
> separation walls.  In the IBC, area separation walls are a subset of fire
> barriers.
> There are manufacturers of melt off anchors that can accommodate an
> attachment to a single wall.  I have generally designed and detailed the
> walls and structures to avoid melt off anchors.  In low seismic zones, a
> single interior fire wall can be designed to cantilever from the foundation.
> In high seismic areas the differential structural movement can be a
> significant problem that tends to force you into 2 walls.
> Regards,
> Harold Sprague
> > -----Original Message-----
> > From:	Scott E Maxwell [SMTP:smaxwell(--nospam--at)]
> > Sent:	Wednesday, June 28, 2000 8:44 AM
> > To:	seaint(--nospam--at)
> > Subject:	Firewall construction
> > 
> > I have a building which may require a firewall (as opposed to a fire
> > seperation wall).  Just to make sure that we are talking apples to apples,
> > my understanding of the "definition" for a firewall is that it is rated
> > wall that must remain standing if the building to either side falls down
> > (collapses).
> > 
> > All my experience with firewalls has been to actually construct two walls,
> > each one attached to one of the structures.  Thus, if one structure
> > collapses , there will still be a wall in place and the other structure
> > will not collapse due to the one side collapsing.
> > 
> > My question is :  Has anyone done a firewall that consists of one wall?
> > 
> > In the building that I am working on, the structure on one side is a high
> > bay with a truss and purlin roof and WF columns.  The other side is a
> > two story office building with composite steel floor beams, non-composite
> > roof beams and steel columns.
> > 
> > Any thoughts or comments?
> > 
> > Thanks,
> > 
> > Scott Maxwell, PE, SE
> >