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# RE: Value for EI in tall wall

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Value for EI in tall wall
• From: "Joe Grill" <jgrill(--nospam--at)swiaz.com>
• Date: Thu, 5 Aug 2004 11:49:51 -0700

```Harold,
Thanks, I have been able to put that together and you have confirmed that
for me.  I guess my next question would be is it O.K. to use the upper bound
value or when is it and when is it not a good idea.

I have once again inherited a project that I have to go through.  It is a
custom home that is to be manufactured with "insulating concrete foam walls"
(ICF walls).  I have a design manual published by PCA with some good
information and design examples. They list the Equations that I mentioned in
my earlier post, but (without explanation) use the upper bound value, where
the example in the Notes on 318-99 uses the lower bound value again without
explanation.  It makes quite a difference in the design of these walls.  I
can't seem to make up my mind as to which and when.

Thanks,
Joe Grill

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Thursday, August 05, 2004 10:21 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Value for EI in tall wall

Joe,

0.1 is the lower bound of EI and 0.4 is the upper bound of EI

Regards,
Harold Sprague

>From: "Joe Grill" <jgrill(--nospam--at)swiaz.com>
>To: <seaint(--nospam--at)seaint.org>
>Subject: Value for EI in tall wall
>Date: Wed, 4 Aug 2004 16:25:30 -0700
>
>I have a tall concrete wall that will fall in to the range of design by the
>magnified moment method.  On page 23-2 of the Notes on 318-99 there are
>equations for determining EI.  I can't decide what's what with that string
>of values.  The following example shows e/h=1.04 therefore, the portion of
>the equation with the e/h becomes negative and doesn't satisfy the
>condition.  Because of that they use the equation with the .1 factor to
>determine EI, but when does the equation with the .4 factor come in.  I'm
>confused.
>
>
>
>Thanks
>
>Joe Grill
>
>
>
>
>

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