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Re: A new angle on "Sliding"

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Ben:

Usually the slosh will generate an overturning moment in the tank that would
require hold downs under some load or all load conditions.  Eg; tank
empty,max wind or tank full and seismic.  Because of the circular shape the
lateral loads would be applied any where on 360 degrees of circumference and
anchor bolts would be required all the way around.

Hope this helps.

Ray Shreenan SE
----- Original Message -----
From: "Yousefi, Ben" <Ben.Yousefi(--nospam--at)ci.sj.ca.us>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, November 14, 2002 3:37 PM
Subject: A new angle on "Sliding"


> We are currently reviewing a steel water tank that is approximately 300
feet
> in diameter and approximately 40 feet high. The designer is proposing to
not
> have any anchorage from the tank to the perimeter ring foundation that the
> tank wall is resting on. His point is that, there is sufficient friction
> between the tank wall and the foundation to resist the seismic forces from
> the tank itself and any sloshing forces from the water!
>
> I have not in, my entire professional life, seen a case where a structure
of
> this magnitude would not use any positive anchorage from the
superstructure
> to the foundation. There is some code language in the UBC, such as
sections
> 1605.2.3 and 1809.3, that deal with anchorage of walls and buildings. And
to
> me it is clear that what is being referred to in those sections is
positive
> anchorage. However, the designer is insisting that using friction is an
> acceptable method of resisting seismic forces in tank design. Any input
from
> those experienced with this type structure is appreciated.
>
> Ben Yousefi, SE
> San Jose, CA
>
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