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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: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
• Date: Thu, 05 Aug 2004 17:20:37 +0000

```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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