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RE: Wood shear panels

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Thanks Gerard,
I forgot to look there.  The SEAOC manual doesn't use Diekmann's exact
notation/method, and I find it a bit quicker to read/understand.  Both
examples are worth studying though. 

Ed

-----Original Message-----
From: Gerard Madden, SE [mailto:gmadden(--nospam--at)maddengine.com]
Sent: Wednesday, December 10, 2003 12:31 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Wood shear panels


If you are talking about straps at the header and sill of the window for
force transfer around the openings, SEAOC 197 UBC Seismic Design Manual
volume II has an example.

Hth,
-gm

-----Original Message-----
From: Ed Tornberg [mailto:edt(--nospam--at)blazerind.com] 
Sent: Wednesday, December 10, 2003 12:27 PM
To: seaint(--nospam--at)seaint.org
Subject: Wood shear panels

If someone of superior knowledge could please massage my brain:

Last week there was a thread on perforated shearwalls.  Someone
mentioned "reinforced openings" (or "force transfer" based on "rational
analysis" as UBC 2315.1 puts it).  Chuck Utzman pointed out that Faherty
is the source for this (Chapter 8 of the 3rd edition).  It's a chapter
authored by Ed Diekmann, and as far as I can tell from previous threads,
Diekmann is the only source ever mentioned for this method.

"Diekmann's Way" for shearwalls is interesting, needless to say.  I have
one nagging question:  On pages 8.46, 8.47, and 8.76, Diekmann shows
shear diaphragm segments with unit shears.  The arrows indicate a
circular flow.  This confuses me. Ignoring axial forces, I would
normally draw unit shear like this (like you see in any mechanics text):

      ______\
       _____
    | |     | |\
    | |     | | 
   \| |_____| |
     ______
     \

I can only resolve the forces in his examples by drawing shear as shown
above.  Is there an explanation for his diagramming? The examples are
very abbreviated in showing calcs, and sign convention isn't discussed.
Are there other examples in other textbooks which also use Diekmann's
notation?  




Ed Tornberg, PE 
Blazer Industries, Inc. 
Aumsville, OR
503-749-1900 

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