correct terminology for a doubler on the bottom of a wood be

huangyhg

correct terminology for a doubler on the bottom of a wood be
a few months back i came across a thread that discussed adding a doubler to the bottom of a wood beam that was undersized.  the thread used a term for the doubler that i had never heard before so i bookmarked it somewhere.  wish i knew where.  i also came across it in a book.  can't find that either.
it's tough getting old especially if you were already stupid.
anyone out there know the correct term?
thanks
dpa

i've heard of using a "strongback".
flitch plate?
flitch plate.  thank you thank you thank you.  i never would have dredged that out of the back of my brain in a million years.
dear eit,
i have heard the term strongback used when a beam like arrangement is used to support a long heavy item at more than one point.  it is used with heavy cranes when lifting pipe or long beams.  it may apply to structures i'm not sure.  i will search the sites for both terms.
thanks guys
dear eit,
you are right strongback is also a structural term in addition to being a crane rigging term.  turns out a flitch plate is vertical and sandwitched between two wood beams and a strong back is on top (maybe also bottom?) of a beam.  
turns out strongback is what i am trying to do here since the structure is not accessible for adding a flitch plate.
thanks again
scab?
a "sister" is added to the side, not below.
mike mccann
mmc engineering
composite?
mike mccann
mmc engineering
laminated...
mike mccann
mmc engineering
flitchplate design:
download at:
i think mike is correct, a lump of timber added to the bottom of a timber beam would be a laminate.  for it to be effective in resisting moment, the horizontal shear has to be developed.  one simple way of doing this is to provide enough shear connection on each half of the beam to develop the strength of the laminate in tension.