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RE: Need "Flitch-plate" design example

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Sounds like we may be thinking of different things.  The flitch plate
beams I'm thinking of are assemblies with a vertical steel plate
sandwiched between doubled-up joists.  It is not a composite design in
that there is no horizontal shear transfer.   The typical application is
a location where beam depth is restricted.  A pair of 2x10's with a
1/4"x 9 1/4" plate assembled together makes a 3.25' wide beam, but has
roughly the stiffness of an 8x10 timber.  

Ed Marshall

> -----Original Message-----
> From:	Bill Allen, S.E. [SMTP:billallen(--nospam--at)]
> Sent:	Thursday, May 14, 1998 6:07 PM
> To:	seaoc(--nospam--at)
> Subject:	RE: Need "Flitch-plate" design example
> I guess where I am "extrapolating" information is with regards to GLB
> strengthening. Years ago, I occasionally reinforced overstressed GLBs
> using
> this method. I then ran into a GLB expert (one who has 40+ years
> experience
> and now spends a lot of time in court as an expert witness) who said
> this is
> a bad idea and will not perform over the long haul.
> With regards to residential construction, collar ties seem to perform
> well
> too, but they won't "calc out" based on some of the modeling I have
> done
> (due to horizontal deflection).
> My previous post was my $0.02 and was merely cautionary. My friend
> Dennis
> Wish can do whatever he desires.
> Regards,
> Bill Allen