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Re: Wood structure with wood diaphragm - question on discontinuity

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Hold it Hold it ... this stuff is all covered in the new Moby Code.

----- Original Message -----
From: From the desk of Joe Otto <jmo_engineering(--nospam--at)email.msn.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, September 30, 1999 3:52 PM
Subject: RE: Wood structure with wood diaphragm - question on discontinuity


>
> -----Original Message-----
> From: SDGSE(--nospam--at)aol.com [mailto:SDGSE(--nospam--at)aol.com]
> Sent: Thursday, September 30, 1999 1:38 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Wood structure with wood diaprhagm - question on
> disconntinuity
>
>
> In a message dated 9/30/99 11:11:22 AM Pacific Daylight Time,
> Seaintonln(--nospam--at)aol.com writes:
>
> <<In the old flexible diaphragm design I would generally consider the
beams
> to
> be a hinge in the diaphragm and design some or all of the columns to be
> laterally restrained. However, in the new methods the roof should be
> considered monolithic in nature and capable of distributing shear to the
> extreme edges.
> If I use the columns as I would in the past, I must penalize the structure
> by
> using an R of 2.2.>>
>
> Dennis:
>
> I have had situations similar to what you described. If you can transfer
the
> shear through the pony wall (which should be minimal since the roof break
is
> in mid span of your diaphragm) then all you have to do is develop your
> chords
> at the ends of the roof break (i.e., at the side shear walls) and you are
> done. I don't think you need the flag poles, but you do need to check the
> stability of the posts due to the diaphragm deflection.
>
> You can model this with a calcpad backer. Just fold it the way your roof
is
> and put it up right and support the ends and push the upper mid point
gently
> and see what happens.
>
> Regards,
>
> Oshin Tosounian, S.E.
>
>
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> Could the chord be developed by using blocking and a continuous strap on
the
> outside of the structure at the elevation of the lower roof if the outside
> of the structure is sheathed?
>
> Joseph M. Otto, P.E.
>
>
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> --------------------------------------------------------------------------
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>
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>