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

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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.





JPEG image