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Fwd: Re: Plywood Shear Walls with Windows

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-----Original Message-----
From:	Bill Allen [SMTP:ballense(--nospam--at)concentric.net]
Sent:	Sunday, March 09, 1997 10:16 AM
To:	seaoc(--nospam--at)seaoc.org
Subject:	Plywood Shear Walls with Windows

Does anyone have a good reference sample calculations
for the analysis of a shear wall with an opening (window)
which requires 2 hold downs instead of 4?

I have one for a hole in a horizontal diaphragm, but
not a shear wall.


Bill, there is a debate going around regarding the deflection of a =
shearwall with an opening in it.  I'm not sure that I agree with designs =
that I have seen combining two piers through the use of drags at the top =
and bottom of the opening. To date there has been no testing to develop =
empirical values for this type of wall deflection.
If you search the Usenet back about six or eight months, there was a =
thread regarding plywood shearwall deflections. John Rose from APA was =
involved in this and has some information regarding combined pier =
deflections. This arose after L.A. City required the H/b ratio reduced =
to 2:1 for plywood shear panels. Arnold Bookbinder developed an analysis =
that he wanted APA to check out combining two narrow piers and =
considering the combination with a reduction factor for the opening.
Finally, Graham Dick, I believe, is chairman of the testing methods =
committee for SEAOSC who has finished a criteria for testing wood =
shearwalls. This was part of the discussion.
Hope this helps.
Dennis

PS: There is a design example for this in the Qlat Pro manual as well. =
You may want to contact Mark Chang to discuss obtaining the example.


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Subject: RE: Plywood Shear Walls with Windows
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