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# RE: Tank design per AWWA (response spectra)

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: Tank design per AWWA (response spectra)
• From: "Fieberling, Eric" <efieberl(--nospam--at)ebmud.com>
• Date: Wed, 17 Mar 1999 17:21:25 -0800

```1. I have used "Guidlines for the Seismic Design of Oil and Gas Pipeline
Systems, ASCE committee on Gas and liquid Fuel Lifelines, 1984.

2. This part of D100 is confusing. I prefer D110 (concrete tanks) which
substitutes Ai for ZICi & leaves the R factors alone. Return period is
part of the design criteria (depending on criticallity of tank etc.) and
spectra developed. Code standard equations remain as minimums.  Note
that the spectral response curve must be for 2% damping (this can be 35%
more Accel. than for 5% damping).

3. Av = .85Ai/Rf  (with Rf = 2.5 for D100)

Eric Fieberling  SE
> -----Original Message-----
> From:	Aswin Rangaswamy [SMTP:aswin(--nospam--at)jps.net]
> Sent:	Tuesday, March 16, 1999 3:48 PM
> To:	Mail Server @ SEA International
> Subject:	Tank design per AWWA (response spectra)
>
>  I would like to get a clarification on the design of tanks using the
> AWWA
> D100-96.  The tank spec. wants us to design using the response spectra
> supplied by the soil engineer.  Here are my questions:
>
> 1.  What method do you use to calculate the impulsive period?  AWWA
> suggests
> a reference but cautions against the use of it!!
>
>  2.  Section 13.4.1 suggests using 2.5 as the Rf factor for a 10,000
> years
> mean recurrence interval.  What do you use for other intervals - 3.0,
> 3.5 ??
>
> 3.  The vertical acceleration (av) has been used in two equations
> (13-25 and
> 13-30).  Is this factored or not? ie., say av is suggested as 85% of
> impulsive acceleration (Ai), then is
> av=Ai
> or
> av= Ai/Rf
>
> Any input would be appreciated.
>
> - Aswin
>
>
>
>

```