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FW: Table 16-O - Horizontal Force Factors, ap and Rp

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I believe that the criteria for rigidity for elements is .06 second
fundamental period.  By my experience, there are not very many elements that
meet this definition.  Mostly rugged pumps or boilers.  When you examine the
period, remember to include all the significant components in the load path
that provide flexibility.

Curt La Count
Jacobs Engineering
Portland, OR
From: Gerard Madden
To: 'seaint(--nospam--at)'
Subject: RE: Table 16-O - Horizontal Force Factors, ap and Rp
Date: Friday, August 27, 1999 11:25AM

I believe if its period is greater than 0.7 seconds it is considered
flexible. I doubt that any rooftop mechanical unit would be considered
flexible unless it was very tall and narrow.

Gerard Madden, P.E.
Civil Engineer, Associate
CRJ Associates, Inc.
email: gerardm(--nospam--at)
tel: 650.324.0691
fax: 650.324.0927