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Moment of Gyration

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I am trying to communicate with some ambient wind vibration experts in Germany.  They want to know what the "Moment of Gyration" is for my project.  Before I can answer their question, I first have to figure out what that term means and how to calculate it.  Google finally let me down.
 
What is the structural "Moment of Gyration"?  How would you calculate it for a simple structure such as a flagpole or canopy?
 
I apologize in advance for my ignorance.
 
Regards,
 
Stan R. Caldwell, P.E.
Dallas, Texas
 
***************************************************
Structural engineering is the art of molding materials
we don't wholly understand, into shapes we can't fully
analyze, so as to withstand forces we can't really assess,
in such a way that the community at large has no reason
to suspect the extent of our ignorance."   ...Jim Amrhein
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