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Re: Sloshing Damping

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Actually, a paper, "Impulsive Hydrodynamics of fluid inside a cylindrical tank and fluid surrounding a cylindrical pier" in the Bulletin of the Seismological Society of America (BSSA) from April 11, 1949 by Lydik Jacobsen of Stanford predates the publications I've seen by George Housner in developing the two mass model for tanks.
Housner, however, should be credited for popularizing the method and simplifying its application. Jacobsen's paper is full of partial differential equations and Bessel functions. Housner's papers tend to provide much simpler explanations and are more readily usable by practicing engineers.
Bill Cain, S.E.
Berkeley CA
-----Original Message-----
From: chrisw(--nospam--at)
To: seaint(--nospam--at)
Sent: Wed, 22 Nov 2006 7:30 AM
Subject: Re: Sloshing Damping

On Nov 22, 2006, at 1:33 AM, Syed A Masroor wrote: 
> There is nothing secretive about this. The formulae and graphs are > documented in API codes. The forces are much reduced for large shallow > tanks.  
I suspect these rules are based on an analysis by G. W. Housner. I'm practically certain I've seen it at one web site or another. You can Google it out. It's also reproduced in 'Nuclear Reactors and Earthquakes,' which is as good a practical reference as any for doing seismic analysis. It's old but earthquakes and structural dynamics are still the same ol'-same ol' Newton's laws and plate tectonics they've always been. 
Christopher Wright P.E. |"They couldn't hit an elephant at 
chrisw(--nospam--at) | this distance" (last words of Gen. 
.......................................| John Sedgwick, Spotsylvania 1864) 
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