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Fwd: Re: cold formed steel

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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 not
have ICBO approval but aisc has table values for screws.
     Some other comments noticed in the field were the fit at the bottom of
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, even
though they calc out.
     If x braces are used they should be tightened after the vertical dead
loads are applied.
     On a rectangular shape building with a comp shingle roof, field built
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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Richard Lewis, P.E.
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