Re: Quick/Easy Question for Seismic List

• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: Quick/Easy Question for Seismic List
• From: "Mike" <mforbes(--nospam--at)ffwse.com>
• Date: Wed, 22 Mar 2000 16:53:46 -0800
```I once did a two-story building about 60' high!  It's the addition to the
Berkeley YMCA (pool downstairs, gym upstairs).  The gym is 30' clear height,
the pool about 22' or so.  Floor cavity is almost 4' and roof about the
same.  It's possible....

----- Original Message -----
From: <EphHirsch(--nospam--at)aol.com>
To: <mritter(--nospam--at)lgt.lg.com>; <seaint(--nospam--at)seaint.org>
Sent: Wednesday, March 22, 2000 4:21 PM
Subject: Re: Quick/Easy Question for Seismic List

> Story drift is relative displacement between each story level, not overall
> building height.  It shouldn't matter whether you're in feet or inches, as
> the factor should be dimensionless (i.e. a %age) so that the resultant
drift
> would be in the same proportional units. (Unless BOCA has some other way
of
> stating the factor, since .02 seems unusually high.  UBC seismic drift is
on
> the order of .004 or .005 times the story height depending on the natural
> period.)  The value calculated using the total building height would not
be
> story drift but total cumulative horizontal displacement at the roof.  By
the
> way, a 3 story building 74 feet high?!
>
> E. G. Hirsch, SE
>
>

```