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RE: Concrete Water Tank, Wall Thichness

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The ACI standard to which you refer is "ACI 350-05".  I am not sure to what 
 you are referencing.

The ACI 350.3-01 standard has a "Z" value, but it is out of date.  In order 
 to ues this older standard you have to go to the bridging equations 
contained in the NEHRP Provisions.  This Z value has nothing to do with the 
 center of mass.  It is a function of the site seismicity.

The current standard is the ACI 350.3-06 (this standard dumped the "Z" 
value).  This standard has a commentary and should be more straight 

One free field response acceleration time history is not much to use.  I 
would suggest using the current ACI 350.3-06 and determine the Ss and S1 as 
 done with the current ASCE 7 or if this is outside of the US use the GSHAP 
 to determine the values.

Regards, Harold Sprague

> From: farazpaydar(--nospam--at)
> Date: Sat, 15 Dec 2012 19:13:20 +0000
> Subject: [SEAINT-SEAOSC] Concrete Water Tank, Wall Thichness
> To: seaint-seaosc(--nospam--at)
> I have a building in which I should
> design a concrete water tank there. The basement elevation is -3 meter 
> and the tank level is +15 m. The client has given a free field response 
> of an acceleration time history (it is just one and not smoothed) and 
> forced me to calculate the tank wall thickness for the piping layout 
> within 7 days. As far as you know ACI 350-05 needs “Z” at the level 
> of tank for evaluating impulsive and convective forces. How can I 
> calculate Z at level +15 with these data?
> I appreciate if you could help,
> Faraz Paydar, SE

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