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RE: Seismic Mechanical Restraints

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This does not seem unreasonable and I have done this several times. Use the
Parts & Portions Fp based on the fault proximity & Ht. above 1st floor relative
to the roof to get the force. Unistrut has a seismic bracing catalog that are
pre-approved and geared toward suspended elements. This is very common for
hospital equipment. The bracing design is pretty easy with the unistrut methods.
You should also check the floor/roof system for anchorage forces (i.e. make sure
the slab is thick enough to accept the proper embedment of the anchors). Most
mechanical engineers (ones doing HVAC design) probably wouldn't come up with the
best design or use the right code equations. You should definately note the
weight of the unit just in case they try to install a heavier machine and use
your design everywhere. Also, if something goes wrong (i.e. pulls out the
anchors) you can point to the weight on the drawings and say "hey, this design
was for a 600lb unit, not a 2000 lb unit"

-Gerard

   -----Original Message-----
   From:   Michael Bryson <bryson(--nospam--at)civil.ubc.ca>@ENRON@EES
   Sent:   Tuesday, August 29, 2000 5:17 PM
   To:     seaint(--nospam--at)seaint.org
   Subject:  Seismic Mechanical Restraints


   A building inspector wants calculations for seismic bracing details for
   the air handling units (suspended from the ceiling) shown on the
   mechanical drawings. Is this to be done by the structural engineer? The
   mechanical engineer just got his details from SMACNA or from jobs done
   with DSA in the past.

   Also, they want the air handling unit weights shown on the structural
   drawings.




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