# RE: Quick/Easy Question for Seismic List

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: Quick/Easy Question for Seismic List
• From: "Ritter, Mike" <mritter(--nospam--at)lgt.lg.com>
• Date: Thu, 23 Mar 2000 08:29:34 -0500
```Charles,

Thanks for the help.

The building height includes a full 20' basement which is fully exposed
on one side.  In addition, thee levels at 18' each totals 74'.

Thanks again,  Mike

> -----Original Message-----
> From:	Charles Espenlaub [SMTP:Cespenlaub(--nospam--at)martinaia.com]
> Sent:	Wednesday, March 22, 2000 4:14 PM
> To:	seaint(--nospam--at)seaint.org
> Subject:	RE: Quick/Easy Question for Seismic List
>
> The 0.02 is unitless.  If multiplied by feet the result is feet.  If
> multiplied by inches, the result is inches.  Therefore 74'-0" x 0.02 =
> 1.48 ft.
>
> On the side, it seems odd that a three story building is 74 ft tall.
>
>
> Charles F. Espenlaub, III, P.E.
> Martin-Espenlaub Engineering
>
>
>
> -----Original Message-----
> From: Ritter, Mike [mailto:mritter(--nospam--at)lgt.lg.com]
> Sent: Wednesday, March 22, 2000 3:18 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: Quick/Easy Question for Seismic List
>
>
> Colleagues,
>
> prepared by another engineer, who calculated the allowable story drift
> for a three story building from BOCA and ran the number based on story
> height in inches.  In other words, the building height is 74', but he
> used 888 inches.  This gives the allowable story drift to be
> 0.02(888")=17.76".
>
> I've always used the story height in feet, which would give an
> allowable
> drift of about 1.48".  I was going to show my colleage the code
> section
> which says story height is in feet, but could not find it in BOCA,
> UBC,
> SBC, Farzad Naiem, or any other text books.  Does anybody have a
> reference section showing that the story height, by definition, should
> be in feet?  I know it must be there, but I'm in a rush and can't find
> it.
>
> Thanks again for the help!
>
> Michael Ritter, PE
>
>

```