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Approximate Period

Approximate Period

Approximate Period

(OP)
What is the correct Ct value from Table 12.8-2 ASCE 7-05 for a shear wall building with a flexible diaphragm?  The table is valid only for rigid diaphragms according to previous SEAOC Blue Books.
The value of Ct approximates the fundamental period of a building.  If Ct=0.02, then the period will be very small (<<0.5 sec), where the actual period can be 1.5 to 2 seconds.  I know Ct is meant to be conservative, but how conservative do you need to be?

RE: Approximate Period

(OP)
Thanks Willis, that's a good article for rigid diaphragm buildings.  
Anyone have any ideas on flexible diaphragms?

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