Fundamental period of tanks

Hello everyone,

 

Those of you who deal with non-building structures:  How are you spending your time determining the fundamental period of flat-bottom tanks (T-sub-i in ASCE 7-05, Section 15.7)?  Are you actually modeling and calculating the value or using simplified equations from material standards (i.e. AWWA or API)?  ASCE 7 appears to really discourage the use of simplified equations.

 

Thanks,

Dave K. Adams, P.E., S.E.
LANE ENGINEERS, INC.
Tulare, CA  93274