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Cantilevered beam design process

Cantilevered beam design process

Cantilevered beam design process

(OP)
I am an E.I. with a design process question.  I'm sizing two paired 14' cantilevered C Channel's.  They are to be used in place of a single I beam on either side of the column.  I'm considering them independently.  Both are laterally braced (flooring), with 20'spacing(Lu)before the cantilever.  The loads are not excessive (650 lbf/ft) but the Lu seems to be my controlling feature.  

Without software, what would be the best design method?  Can I use Allowable Uniform Load Tables with a cantilevered beam?  

Thanks
auxblade

Luke Leising
M.Architecture
B.S.Civil Engineering

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