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Period of rigid non building structure[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Period of rigid non building structure
- From: "Joseph R. Grill" <jrgrill(--nospam--at)cableone.net>
- Date: Mon, 14 Apr 2008 14:20:53 -0700
I am looking at (the overturning only, per the clients request) an industrial stack that will be constructed of basically 24” dia. ¼” thick pipe. The stack is about 25’ tall and will be supported on a steel skid. ASCE 7-05 has an equation 15.4-5 for a Rigid Nonbuilding Structure which must have a “T” less than .06s. If not, the way I read things is that if it is not rigid then V is calculated from 12.8-1 using Cs from 15.4.1 (2). If all of this is correct, I guess that I could assume a rigid structure (since V will be larger using 15.4-5 and wind will probably govern overturning anyway) or calculate the period and see if it isn’t rigid and use the other equations that I have listed. I don’t really have a problem assuming a rigid structure and using the larger V, but I would like to see what happens if it isn’t. Now to my other question. How can I calculate the period of a non-building structure such as this. Basically a vertical pipe on a steel skid. In all my references, I can’t find an example. Can anyone out there help me out?
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