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Dynamic Analysis - STAAD III

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In the dynamic analysis section of STAAD III, the response is computed on the 
basis of contribution from mode frequencies less than 60 cps.  Any 
participation of higher modes are ignored. Does this limitation imply that 
the effect of mode frequencies higher than 60 cps are insignificant?  If so, 
is that assumption valid for all structures?

P. Rajendran
Service & Technology Corporation
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Bartlesville, OK 74003
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