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NDS Flat Use Factor

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The 1997 NDS Supplement provides a Size Factor CF for beam members used with loads applied to the narrow face.  For Flat Use, factor Cfu is given.
Because of the word "also" in the explanation of Cfu, my interpretation of the use of the factors is that the allowable flexure value for flat use is based on using both the Size Factor and the Flat Use factor so that Fallow = Fb x CF x Cfu.  Is that correct?
Nels Roselund
Structural Engineer
South San Gabriel, CA