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Fwd: Re: cold formed steel

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There's something about cold formed steel framing that I've been wondering
about for a long time. I realize one of the problems faced with this type
of construction is the inability to achieve an R value anything close to
wood framed construction. But, what about the loss of strength of the
framing system during a fire? I realize the studs and joists are wrapped
with gyp. board and plywood on floors and gyp. board and stucco on walls,
but the framing will still get warm. According to AISC, the yield strength
will drop to 37% at 1200 degrees. Does anyone know if this issue has been
addressed by the industry?

Bill Allen

> From: HARRISENGR(--nospam--at)
> To: seaoc(--nospam--at)
> Subject: Re: cold formed steel
> Date: Monday, April 14, 1997 10:21 PM
> In a message dated 97-04-14 21:39:46 EDT, you write:
> >
> >As far as shear walls using metal studs goes, all I've got is UBC report

> >Number 4144.  I could fax you a copy.
> >
> >
>      I have engineered steel stud houses using a variety of shear systems
> including this one. The pins referenced in this report did not "suck" the
> plywood up to the studs and somtimes bent the stud flange instead of
> penetrating it. I would recommend screws instead. Unfortunately they do
> have ICBO approval but aisc has table values for screws.
>      Some other comments noticed in the field were the fit at the bottom
> the stud seemd poor and the psi load is high. Especially with a tile roof
> load or other heavy system.
>      The bracing/blocking of the flanges needs a lot of attention.
>      Long span floor joists have a funny feel ( vibration ) and sound,
> though they calc out.
>      If x braces are used they should be tightened after the vertical
> loads are applied.
>      On a rectangular shape building with a comp shingle roof, field
> trusses at 4' oc with hat channel the other direction at 2'oc worked very
> well, except at a couple interior shear walls.
>      I would recommend being very conservative at least until after
> structural observation of one of your own designs.
>      Hope that helps.
>      Tom Harris, SE
>      Thousand Oaks, CA

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From: "Bill Allen, S.E." <ballense(--nospam--at)>
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Subject: Re: cold formed steel
Date: Tue, 15 Apr 1997 07:18:26 -0700
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