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Re: Bracing in a Freezer Building

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Rich,
 
    The last freezer building I designed I used inverted V bracing.  I used one brace on each wall (only 10,000 sf).  The thermal movements were not too bad, they add some residual moment to the brace beams and pull the columns out of plumb slightly.  This is something you can account for in advance.  You can always have them readjust the hopefully bolted connections after the building has reached operating temperature.  Don't forget to thermally isolate your base plates.  What are you doing for the freezer floor.  I've got some details around here somewhere.  Give me a call if you want them.
 
bks
 
----- Original Message -----
From: Rich Lewis
Sent: Sunday, March 18, 2007 9:09 PM
Subject: Bracing in a Freezer Building

I?m working on a freezer facility.  The primary framing is steel.  It is approximately 275? x 325?.  I?m looking at ?X? bracing for wind loads.  Seismic is small in comparison.  It is being built in Texas.  The operating temperature is zero F to minus 15 F.  The steel has a potential swing of 75-100 degrees.  Right now I?m looking at 3-4 bays of ?X? bracing.  The ?X? bracing would be in consecutive bays.  The problem I?m finding is the outer columns have extreme uplift loads from the temperature swing.  The steel at the roof level contracts horizontally and doesn?t at the foundation.  The ?X? wants to resist this movement.  This in turn causes large uplift forces on the outer columns of the bracing.  I?ve looked at several different bracing layouts and still end up with the large uplift forces. 

 

I?m hoping there are others who can give me insight into freezer building bracing systems that can accommodate the large temperature swings.  I?m also looking for resource on the design of freezer facilities from a structural standpoint.  I?ve looked through SEAInt archives and found information on the foundation, slab, etc., but not the steel framing.  I did a search of AISC site and didn?t find anything.  Are there any good articles or books on freezer building design, particularly the structure?

 

Thanks for your help.

 

Rich


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