# RE: [StrucTX] Modeling Steel Deck As Shear Diaphragm

• To: "'structx(--nospam--at)topica.com'" <structx(--nospam--at)topica.com>, "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: [StrucTX] Modeling Steel Deck As Shear Diaphragm
• From: "Polhemus, Bill" <wlpolhemus(--nospam--at)sbinfra.com>
• Date: Wed, 12 Jan 2000 08:31:24 -0600
```Except I should have included the following:

G' = G * t, where t=thickness of equivalent flat plate. From this, knowing
G' (from manufacturer's data), and G (from Theory of Elasticity), one can
derive t.

FWIW, t ends up being a TINY number, on the order of HALF A MICRON. This
reflects the astounding shear flexibility of the steel deck as diaphragm.

-----Original Message-----
From: Philip T. Hodge [mailto:phil(--nospam--at)joistdesign.com]
Sent: Tuesday, January 11, 2000 10:46 PM
To: structx(--nospam--at)topica.com
Cc: 'seaint(--nospam--at)seaint.org'
Subject: Re: [StrucTX] Modeling Steel Deck As Shear Diaphragm

Bill:

Offhand I can't think of anything wrong with this approach.

Phil

"Polhemus, Bill" wrote:

>
> The way you want to do this in a simple wind load analysis is:
>
> 1. Determine steel roof deck type gage.
>
> 2. Compute G' value from manufacturer's catalogue information.
>
> 3. Determine an equivalent thickness of flat steel plate that will have G
=
> G'.
>
> 4. Use this thickness as the property of your "plain stress" element which
> you will put in your model.
>
> If I'm forgetting stuff, let me know. Sorry, it's been awhile since I've
> done this and I have to be sure I've got it right.
>
> Thanks.

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