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RE: Tank Support Seismic Design

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Yi
Please refer to loading combination 1612.3.1
See equation 12-10
Samir Y. Ghosn, P.E.
Harris & associates
At 03:37 PM 6/6/2001 -0700, you wrote:
>If the tank is elevated, say for 2', by the support legs, which means the
>tank bottom is capable of holding up the liquid content on it's own, then I
>can still use the total weight of the content plus the tank for overturning
>resistance?
>
>Yi Yang
>Summit Engineering Inc.
>Santa Rosa, CA
>
>-----Original Message-----
>From: Ron Hill [mailto:ronhill(--nospam--at)hillce.com]
>Sent: Wednesday, June 06, 2001 2:49 PM
>To: seaint(--nospam--at)seaint.org
>Subject: RE: Tank Support Seismic Design
>
>
>Use AWWA D-100.
>Fig. 9:
>For D/H= 1.0 , 80%
>For D/H=.5, 90%
>
>Sloshing modes are determined for flat bottom tanks and AWWA does not
>generally consider sloshing for elevated tanks since the elevated tanks are
>generally smaller diameter and the sloshing  period may be close to the
>support structure period.
>
>Ronald Hill, P.E.
>HILL Consulting Engineering
>Birmingham, Alabama  USA
>Phone: 205.823.4784
>FAX: 205.823.4145
>Email: ronhill(--nospam--at)hillce.com
>Efax: 509.275.8095
>http:\\www.hillce.com
>
>
>
>-----Original Message-----
>From: YI [mailto:YI(--nospam--at)summit-sr.com]
>Sent: Wednesday, June 06, 2001 3:11 PM
>To: 'seaint(--nospam--at)seaint.org'
>Subject: Tank Support Seismic Design
>
>
>I'm looking for some references or examples for designing tank support for
>seismic loads.
>
>Considering an above ground cylindrical steel tank supported with, say 6
>short legs, with liquid content (water).  In order to determine the gravity
>resistance to the seismic overturning force, you have to figure out how much
>of the content is "impulsive", i.e. the content is acting as a solid mass
>rigidly attached to the wall, which will contribute to the resistance to the
>overturning force.  I don't think I should use the entire weight of content
>plus tank to determine the overturning resistance.  Thanks for any info.
>
>Yi Yang
>Santa Rosa, CA
>
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