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Are you talking about including an adequate number of modes
to generate acceptably-accurate dynamic characteristics using
response spectrum analysis?  If so:

I've always heard that including 90%-95% of the modal mass
is the "acceptable" criterion (for academic purposes).  I'm
inclined to say that would be a good target in general, although
I'm not sure what the typical standard is for professional
modeling.  Anybody?

Professor Chopra (UC Berkeley) has an excellent textbook
on dynamic analysis of structures that has a relatively thorough
discussion of modal analysis and the response spectrum method.
A trip to most university libraries will probably yield a copy,
if you don't want to purchase one.


Charley Hamilton

Charles Hamilton, PhD EIT               Faculty Fellow
Department of Civil and                 Phone: 949.824.3752
    Environmental Engineering           FAX:   949.824.2117
University of California, Irvine        Email: chamilto(--nospam--at)

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