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Re: Light gage boxed header limitations

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I believe transferring the out of plane wind load back into the king post and designing that post for Biaxial loading will be the biggest problem.
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA
In a message dated 4/21/2009 5:46:24 A.M. Pacific Daylight Time, wilsonengineers(--nospam--at) writes:
I have been asked by an EOR to design a 24ft long boxed header with light gage framing.  This member will be laterally unbraced in a curtain wall assembly.  Are there any practical limits to the span of such a header in a 6" wide wall?  The loads are only in the 200lb/ft range vertical.  Horizontal loads are less.
The "Standard for Cold-Formed Steel Framing - Header Design" by AISI only states length limits for L-shaped headers.  Header calcs in this standard only address bending, shear and web crippling.  I don't believe that the AISI main spec will adequately model a long-span composite assembly.
I would like to either find a conclusive way to design this header or prove that it is not practical.
Thanks in advance.
Jim Wilson, PE
Stroudsburg, PA

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