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Re: Discussion of Available Info on Design of Built-Up Box Beams/Headers

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Bill:

Calculate the loads on the header as you would normally and then look up the properties(allowable spans, stud axial loads etc.) in the catalogue supplied by most light guage metal stud manufacturers. Check max bearing values for support stud or column and or provide steel gusset plates each side to the king studs to take care of the horizontal and vertical loads with sheet metal screws. The shear values for screw sizees can be found in the Cold Formed Steel Design Manual for various thicknesses of steel and screw sizes.
Hope this helps.

Ray Shreenan SE
----- Original Message ----- From: "Bill Polhemus" <bill(--nospam--at)polhemus.cc>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, November 10, 2004 1:06 PM
Subject: CFS: Discussion of Available Info on Design of Built-Up Box Beams/Headers


Greetings, All:

I am looking at a built-up box beam/header made from two C-shapes facing
lip-to-lip, nested inside a track shape on top and bottom. The C-shapes
face lip to lip but stand off from each other to rest against the
flanges of the tracks.

I'm attaching a JPEG of the shape for clarity's sake (size is only 6k).

Looking through the book "Cold Formed Steel Design" by Dr. Wei-Wen
Yu--assumed to be the Bible of CFS design--I really don't see much about
design aspects for this type of shape. I am assuming that one needs to
design fasteners (in this case, screws) to handle shears, etc., but how
does one approach the various checks one has to do?

Thanks for any illumination.








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