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Re: Omega for Wood Shearwall Hold-Downs

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IMO, the holdown at the end of the upper wall would not need to be designed
for Omega level forces, since it is attached in the plane of the upper wall.
(The system is not discontinuous yet.)  The supporting beam, the holdown at
the lower shear wall, the lower shear wall, the diaphragm attachment and
attachment to the foundation should all be designed for Omega level forces.

HTH

Conrad Guymon, P.E.

----- Original Message -----
From: "Gerard Madden" <gmadden(--nospam--at)duquette-eng.com>
To: "SEAINT LISTSERVER (E-mail)" <seaint(--nospam--at)seaint.org>
Sent: Wednesday, January 30, 2002 1:56 PM
Subject: Omega for Wood Shearwall Hold-Downs


> Seismic Design Manual Vol. II, in its example on page 74 shows that the
> Hold-Down is designed for Omega Level force when it is a discontinuous
> shearwall in an upper floor.
>
> My interpretation of the code language (UBC 1630.8.2.1) is that only the
> Beam supporting the shearwall above needs to be designed for the
compressive
> and tension forces at the shearwall ends using Omega level forces.
>
> Anyone want to clarify this for me?
>
> Thanks,
> -gerard
>
> Gerard Madden, PE
> Design Group Manager
>
> Duquette Engineering
> 10 South Third Street
> San Jose, CA 95113
> T: 408.494.0944 - ext 102
> F: 408.494.0940
> E: gmadden(--nospam--at)duquette-eng.com
> w: www.duquette-eng.com
>
>
>
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