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RE: stack foundation

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See ASTM STS-1-92 for a 1992 treatment of a steel stack. I do not know if a later version is available. I have also found Gaylord & Gaylord structural engineering handbook to be a good reference. One of the biggest problems with steel stacks is wind and vibrations from same. Be careful also of shielding effects if you have another item within the zone of influence. Those effects do exist and are a real world. I have treated fatigue failures in the steel stacks. This sounds like a concrete stack.
Regards,
Bob Hanson, S.E.
-----Original Message-----
From: Ken Peoples [mailto:lvtakp(--nospam--at)yahoo.com]
Sent: Tuesday, September 19, 2000 1:58 PM
To: seaint(--nospam--at)seaint.org
Subject: stack foundation

We have been asked to design a foundation for a 200-foot high, 20-foot diameter stack. Can anyone give me any "watch out for's" or direct me towards any reference information.  I am going to have a soils investigation by a geotech to be sure that we don't have any settlement problems using a "shallow" foundation.  I am guessing (this is in the very preliminary stages)  that the foundation will be something like a 25 foot hexagon maybe 8 feet thick.  What kind of factor of safety should be used for overturning for a structure like this? One thing that I was thinking might be a problem is heat because of the fairly large mass of concrete that will be needed.  All of your thoughts are appreciated.

Ken Peoples, P. E.

lvta(--nospam--at)fast.net

 



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