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RE: [StrucTX] Modeling Steel Deck As Shear Diaphragm

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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.

Any other thoughts or comments?

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


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


"Polhemus, Bill" wrote:

> Please help me to refresh my memory:
> 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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