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Re: UBC97 question

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Michael/Ken --

	It's possible that you're seeing resonance behavior due to the location
of the natural frequency of the structure.  however, as someone already
pointed out, it's pretty hard to determine a cause without a substantial
amount of information.  But, it's likely that if the natural frequency
of the structure is near a peak i nthe response spectrum, then you're
probably seeing resonance.  

	Is it possible that you're considering inelastic response in one
analysis and elastic in the other?  How do your member forces vary? 
Higher?  Lower?  

	These are just a few ideas for what you might be able to look at to
find your conflict.

	Charley

----------
Charles Hamilton, EIT			Graduate Student Researcher	
Department of Civil and 		Phone: 949.824.8694
    Environmental Engineering		FAX:   949.824.2117 
University of California, Irvine	Email: chamilto(--nospam--at)eng.uci.edu