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Re: Seismic acceleration of H2O[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Seismic acceleration of H2O
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: 26 Feb 98 17:13:11 -0500
(This message is being re-sent since it didn't appear to go thru the first time.) In general, current seismic design procedures for fluid containments are based on the Housner method (described in Chapter 6 of TID-7024, National Technical Information Service, US Department of Commerce). This includes considerations for portions of the fluid as sloshing (convective mode) and as fixed (impulsive mode). The American Water Works Association has similar seismic design procedures for Welded Steel Tanks for Water Storage in their publication ANSI/AWWA D100-96. Committee 350 of the American Concrete Institute is working on a new code for Environmental Engineering Concrete Structures, ACI 350, which will include Chapters 21 & 52 on Seismic Design of Liquid-Containing Structures - but it has not been published yet. The codes are being written in the format of current U.S. building codes but with reduced "ductility" factors (e.g., Rw = 2.75 would correspond to designing the tank for ground acceleration with Cmax = 2.75). Conservatively, the entire fluid contents can be assumed as accelerating as a mass (impulsive mode), with the fluid force applied 1/2 on each the front and back walls (for a rectangular tank with cantilevered walls) and with resultant load at mid-height of fluid. This can be used for small tanks but would be too conservative for larger tanks.
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