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Re: Steel Joists Girder Frames

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Roof vibrations are not considered as important as floor vibrations because
they aren't annoying to the persons, and therefore this issue is rarely
addressed in design. On the other hand, floors with mechanical equipment
generally have a thick concrete slab that helps to reduce the vibration
effect, in addition to the fact that vibrating equipment are generally
base-isolated.

Javier Encinas, MSCE, PE
ASDIP Structural Software

-----Original Message-----
From: Dave Morris <davem(--nospam--at)endex.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Thursday, September 16, 1999 7:07 AM
Subject: Steel Joists Girder Frames


>Just received a notice from the steel joist institute advertising their
>Technical Digest #11 - Design of Joist-Girder Frames.  Also included is a
>list of their technical publications.  This brings up two questions to me:
>
>1) Can joist girder moment frames be used in a seismic zone?  Code special
>seismic detailing requirements are most easily applied to wide flange beam
>to wide flange column applications.  Have cyclic loading tests been done
for
>these type of frames?
>
>2) We have long used the SJI procedure and programs for floor vibration.
We
>have been unsuccesful in finding reference material for design of steel
>joists for vibrating load due to mechanical equipment.  Roof top HVAC
>equipment is the most common application.  Are there references for this
>type of design?
>
>Dave Morris P.E.
>Corvallis, OR
>
>
>
>