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RE: Seismic acceleration of H2O

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You will develop impulsive and convective fluid loads.  The generally used standard has traditionally been the Army TM 5-809-10, Chapter 13.  There is also a newer methodology that will be referenced in the 1997 NEHRP that will use the AWWA D100 methodology, which will be the ACI 350 methodology whenever it gets through ACI.

Be careful on the analysis.  If it is circular, it will act as a ring and not so much as a cantilever; if it is rectangular it will develop 2 way action.  Reference the PCA tank design guide.  The design criteria will be predicated on the prevention of leaks and crack size limitation.  Look at the ACI 350 for performance requirements.  There are also different load factors than used in ACI 318 that must be considered.

Harold Sprague, PE, Office Manager
Krawinkler, Luth & Assoc.
4412 W. Eisenhower Blvd.
Loveland, CO 80537
Voice: 970 667-2426
Fax: 970 667-2493
Email: hsprague(--nospam--at)

-----Original Message-----
From:	STEVE CAMPBELL [SMTP:scampbell(--nospam--at)]
Sent:	Wednesday, February 25, 1998 9:48 PM
To:	seaoc(--nospam--at)
Subject:	Seismic acceleration of H2O

I am evaluating an existing concrete water reservoir tank with cantilevered walls and no lid.  What seismic load will be induced on the cantilevered walls by the water, assuming the tank is half full?
Assuming the structure is located above grade, what shape does the water seismic load diagram take?
Any references?
Steve Campbell, P.E.