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RE: dead load resisting - Perforated shear walls - published d esignexample?

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Since I posted this before Zeno Martin from APA responded in private.  In
the new APA "Diaphragms and Shear Walls Design/Construction Guide" they have
an example illustrating a way to use dead load to resist tension.

 The method the guide uses for perforated walls has the distributed load
directly above interior segments included in load combinations resisting
bottom plate unit tension that is equal to the unreduced capacity of the
wall nailing pattern.  The guide also only uses half the dead load on the
outside panel in load combinations sizing the outer tiedown anchors.

-----Original Message-----
From: Forrest Braun [mailto:fbraun(--nospam--at)bbfm.com]
Sent: Wednesday, March 06, 2002 2:45 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: dead load resisting - Perforated shear walls - published
designexample?


Scott

I have at least three articles that I have picked up the last couple of
years including the original study.  None of them address one way or the
other the use of dead loads to resist the overturning.  Logically it
makes sense to do so as chapter 16 IBC/UBC allows it.  The question is
to what extent and how to combine with the various provisions of the
perforated shear wall design.

"Haan, Scott M." wrote:
>
> Hello:
>
> Has anyone seen any published design examples for using dead load to
resist
> overturning tension in perforated wood panel shearwalls?  A design example
> in draft of an example that is going to be published?  Please help me get
a
> copy if know of one and I will buy the book.  The FEMA 369 commentary
> conveniently dodges the issue.
>
> In discussions, I have been told that it is permissible to use the
> distributed load over the wall to reduce the interior wall segment bottom
> plate unit tension.  Also that you should only use the load that is over
the
> outside segment when designing holdown anchors at the outer ends.
> Unfortuneately I have not seen any textbook examples to back this up.
>
> Thanks!
>
> Scott M Haan P.E.
> Plan Review Engineer
> Building Safety Division
> Development Services Department
> Municipality of Anchorage
> http://www.muni.org/building
> phone:907-343-8183
> fax:907-249-7399
> mailto:haansm(--nospam--at)ci.anchorage.ak.us
>
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--
++++++++++++++++++++++++++
Forrest T. Braun, P.E.
BBFM Engineers, Inc.
Ph (907)274-2236
Fx (907)274-2520
Anchorage, Alaska
http://www.bbfm.com
++++++++++++++++++++++++++

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