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Re: Building Natural Frequency

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>I am curious how everybody comes up with the natural frequency of a
Typically you assume the structure is a simple (SDOF) system with masses 
lumped at floor levels and the stiffness is the lateral stiffness of the 
structural framing. You end up with as many degrees of freedom as 
stories. You can do a manual solution of a 3-5 DOF system with a 
spreadsheet or even by hand if you want.

There's a good book on the topic called 'Structural Dynamics for the 
Practising Engineer,' by H. M. Irvine. I found mine at a second-hand 
bookstore for less than $10. It's really a great book, with plenty of 
insight without losing track of the fundamentals.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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