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Re: Fundamental Frequency of Tall Steel Tank

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Assuming your tanks have a uniform mass you are basically dealing with a cantilever beam where the period will be proportional to the deflection.  You can work out the numbers yourself but a reasonable starting number will be:

T = 0.26 x sqrt of (deflection in inches)

Thomas Hunt, S.E.

"M. David Finley, P.E., P.A." <davidfinley(--nospam--at)>
10/06/2006 07:59 AM
Please respond to seaint
"Seaint(--nospam--at)Seaint.Org" <seaint(--nospam--at)>
Fundamental Frequency of Tall Steel Tank

I'm doing some preliminary sizing for the foundations for some tall cylindrical steel tanks - 8'-0" diameter x 66'-0" high.  They will be in a low seismic area, so wind loading is my concern right now.
I need to estimate the fundamental frequency of the tank in order to determine the Gust Factor per ASCE 7.  Can someone point me to a good reference?  Is there a reasonably conservative value I can assume for this preliminary work?
Since I am just considering wind at this point, the empty tank will control and therefore I don't need to consider the added effects of the liquid contents in determining the fundamental frequency, right?


David Finley
M. David Finley, P.E., P.A.
2086 SW Main Boulevard - Suite 111
Lake City, FL  32025


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