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RE: Hydrodynamic Pressure

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Thanks for your suggestions. I was planning on building a SAP2000 finite
element model of the structure and doing an equivalent static load analysis
if I could define the pressure. I don't have the time or the math skills to
derive Housner type formulas for a sloping bottom. We don't own a copy of
some of the fancy transient fluid dynamics software that's out there, and
our client doesn't have the budget to turn this into a research project
anyway. Absent better methodology, my plan was to use the Housner formulas
in TID 7024 (with corrections)assuming maximum, minimum and average depth
and seeing what gives me the worst results. I can estimate wave runup
crudely using formulas from the Corps of Engineers shore protection manual
once I have a first mode free field amplitude and frequency to start from.
Even with its shortcomings, I figure the analysis will be a whole lot better
than whatever the original designer was assuming back in the 1970's. 

-----Original Message-----
From: Christopher Wright [mailto:chrisw(--nospam--at)]
Sent: Tuesday, December 14, 1999 10:59 AM
To: seaint(--nospam--at)
Subject: Re: Hydrodynamic Pressure

>I am checking the seismic design of an older, oval shaped concrete
>and need to estimate hydrodynamic fluid pressure on the walls.
If this were my job, I'd use something a little fancier than manual 
arithmetic on this, if only to look at the actual state of stress in the 
walls under pressure. The oval shape wants to induce bending stress 
across the thickness of the wall. Sloshing is also tricky, not just 
because of decreasing depth but because the width (dimension normal to 
wave progression) changes. I think I'd do some serious sniffing around 
for references on non-rectangular tanks. You might want to hit a nearby 
university library or check out online library catalogs for references. 
The old United Engineering Center Library has moved to Linda Hall (U 
Kansas, I think) <>. It'd be worth a check.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)