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RE: "Flitch-plate" design

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There is also a discussion in  ASCE's "Wood Structures, A Design Guide
and Commentary", 1975, Section

"... defined as 'a vertically laminated beam composed of one or more
pieces of timber with one or more metal plates on the sides or between
the timbers and fastened to each other so as to act as one unit ...  at
the beginning of this century, flitch beams were quite common and
accepted in building construction everywhere' ... yet the need to
predrill both lumber and steel plate, to allow bolting, made the
assembly of flitch beams time consuming, unpopular, and uneconomical in
light of advanced technology."  It then goes on to discussion testing of
nailed assemblies using sheet steel rather than plate steel.  

By the way, I've seen a least a couple to text books that included
flitch plate beam design in them, but don't have them at hand.

Ed Marshall, PE
Simons Engineering

> -----Original Message-----
> From:	Bill Allen, S.E. [SMTP:billallen(--nospam--at)]
> Sent:	Friday, May 15, 1998 9:46 AM
> To:	seaoc(--nospam--at)
> Subject:	RE: Need "Flitch-plate" design example
> In this entire thread, this post is the only one which contains a
> reference
> to a published (as opposed to "home-brew") solution. I would be very
> interested in reviewing it. If it is not too much trouble, please mail
> a
> copy to:
> Bill Allen
> P.O. Box 7347
> Laguna Niguel, CA 92607
> Thanks,
> Bill
> -----Original Message-----
> From: John Buchanan [mailto:jjb(--nospam--at)]
> Sent: Thursday, May 14, 1998 1:05 PM
> To: seaoc(--nospam--at)
> Subject: Re: Need "Flitch-plate" design example
> At 11:55 AM 5/14/98 -0700, you wrote:
> >My client does not want to remove and replace an existing 4x16 DF #1
> Beam
> >which will span 18'-6" once the center column is removed. The roof
> trib on
> >the member is approximately 12'6". The beam is continuous over this
> support
> >(that's being removed) and the member calculates about 22%
> overstressed in
> >bending for the 18' span.
> >He has asked if I could design him a Flitch Plate with 1/4" steel
> sideplate
> >and a 1/4" x 3" leg to rest the existing patio framing at one side.
> >I have not designed one before and am not really sure how to go about
> it. I
> >assume it is similar to a composite beam design, yet the plate is
> only on
> >one side and is to be lagged to the face of the existing beam.
> >
> >If anyone has a sample of an analysis that I can follow, I'd
> appreciate it.
> >
> >Thanks
> >Dennis Wish PE
> >
> See section 10.35 of a book called "Wood engineering and Construction
> Handbook"
> Keith F. Faherty and Thomas G. Williamson
> McGraw Hill
> I Can send you a copy of the chapter next week if you'd like
> John Buchanan