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RE: Need "Flitch-plate" design example

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I have used steel plates to reinforce wood beams, but never with the steel on 
just one side.  The way I looked at it was if you could use steel side 
plate bolted connections on wood members you should be able to bolt steel 
side plates to a beam to reinforce it.  The criteria is that the steel side 
plates must deflect vertically the same amount as the wood beam and then 
install enough bolts so that that portion of the load is distributed to the 
steel plates.  Because steel is so much stiffer than wood, steel usually ends 
up taking about 90% of the load.  

For spacing of the bolts along the compression edge of the steel plate, I use 
AISC's maximum spacing of bolts for a cover plate on a built up member (Sect. 
E4).

A. Roger Turk, P.E.(Structural)
Tucson, Arizona