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Re: Fundamental period of tanks

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From API 650, the first mode sloshing wave period (Tc), in seconds, is taken from the below formula:

Tc = Ks x square root of D

Ks = 0.578 / square root of tanh(3.68H/D)

Thomas Hunt, S.E.

"Dave Adams" <davea(--nospam--at)>
12/27/2007 12:04 PM
Please respond to seaint
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.
Dave K. Adams, P.E., S.E.

Tulare, CA  93274

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