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Re: Flat Bottom Tank Anchorage

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Is your design an API or AWWA tank? 
   Is it a tank supplying a supply during an emergency?
   In what Seismic Zone is the tank? 
   Where is the tank location and distance in relation to the nearest 
known active fault(s)?
   When anchor shear bolts are provided, (which do damage during an 
event), each should be assigned an equal share in resisting the seismic 
lateral and vertical loads. 

Pax e Gratia
Bob Ross
Robert P. Ross, P.E.
Principal Project Manager
Washington Group International,Inc.
Industrial Processes
17320 Red Hill, Suite 300
Irvine, Ca. 92614 
Mobile 562-254-4604
Office 949-222-3978
FAX 949-222-3985
E-mail: Bob.Ross(--nospam--at)WGINT.com

----- Original Message -----
From: YI <YI(--nospam--at)summit-sr.com>
Date: Wednesday, October 17, 2001 6:05 pm
Subject: Flat Bottom Tank Anchorage

> I have question regarding the design the anchor bolts for a 
> circular tank
> with bottom fully supported on concrete pad.
> When a lateral load is applied to the tank, assume no fiction 
> between the
> tank and the pad, the lateral load is resist by the shear capacity 
> of the
> anchor bolts.  The maximum shear force per anchor bolt is occured 
> on the
> bolt located 90 degres from the direction of applied load, and 
> minium  shear
> on anchor bolts occure on the bolts that are in line with the applied
> lateral load.  Consider the situation where there are only 4 
> anchor bolts on
> the ring of the tank base, will there be any shear force at all on the
> anchor bolts located in line with the direction of the applied lateral
> force?  Are all the lateral force resisted by the 2 anchor bolts 
> located 90
> degrees each side of the load direction?
> 
> Thanks in advance.
> 
> Yi Yang
> 
> 
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