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RE: Earthquakes and friction.

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The response of the tank depends on the height to diameter ratio.  There are two different modes of reaction of the liquid in the vessel which determine how it will act: the sloshing and the impulsive modes.  The sloshing mode is predominant in a low and wide tank; in this mode, waves are induced which travel across the tank producing changes in direction of the forces.  This tank will not slide on soil and if wide enough not on concrete either.  This is completely different than with a narrow, tall tank.  In between the two extremes you have a combination and the type of support and other factors become important.


Richard Hess, S.E.


From: gregory szuladzinski [mailto:ggg(--nospam--at)]
Sent: Monday, August 30, 2010 1:20 AM
To: Sseaint Org
Subject: Earthquakes and friction.


This comment in reference to the discussions still raging:


If you think about friction between tank's bottom and concrete underneath

the answer is simple: Regardless of static and dynamic coefficients

the tank will simply slide along during earthquake, in small steps.

There is no friction to speak of.


The situation is better when the tank sits on a granular medium, such as soil.


Gregory from Oz