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Fundamental Period Question ASCE 7-05 12.8.2

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The designer can calculate the approximate period Ta from the formula 12.8-7 which is;

Ta = Ct (hnx)  (EQ 12.8-7)

Or he or she can use an approximate period from section 11.6(1) equal to 0.8(Ts ) where Ts = SD1/SDS.


My question is if you compare both methods to calculate Ta would you use the maximum or minimum results for Ta when calculating the  Seismic Response Coefficient Cs in formula’s 12.8-3 and 12.8-4?


Dennis S. Wish, PE


Dennis S. Wish, PE

California Professional Engineer

Structural Engineering Consultant