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DeltaS of UBC97 1630.9.1

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Question: 
For concrete moment frame building, while calculating
the DeltaS of UBC97 1630.9.1, the "design seismic
force" is 
(1) V (per 1630.2.1), or 
(2) E (per 1630.1.1 including Reliability/Redundancy
Factor), or 
(3) load combinations (1612.2.1 with additional 1.1
factor for concrete)? 

Thanks in advance,

James Lin
IDS, Inc.


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