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Re: Calculation of Av in API 65 and PIP STE0320

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Thanks for your help.

On 28/02/2010, Harold Sprague <spraguehope(--nospam--at)> wrote:
This is an area on which I have had some involvement.  I would refer you to the following paper:
Journal of Earthquake Engineering, Vol. 8, 2004 "The Vertical-to-Horizontal Response Spectral Ratio and Tentative Procedures for Developing Simplified V/H and Vertical Design Spectra" by Bozorgnia and Campbell.
There will be a methodology presented in the ASCE 7-10 and will be from the NEHRP.  
The Av determination is contained in the 2009 NEHRP Provisions and Commentary.
Bozorgnia and Campbell studied thousands of earthquake records to determine V/H ratios relative to fault proximity.  It is NOT 0.2SDS.

Regards, Harold Sprague


Date: Fri, 26 Feb 2010 19:12:39 +0300
Subject: Calculation of Av in API 65 and PIP STE0320
From: ashraf.manjappara(--nospam--at)
To: seaint(--nospam--at)

We are designing some tank foundationss as per API 650 and PIP standrad STE0320 May 2005- Guidelines for Tank Foundation Designs.
How to calculate Av which is the maximum vertical seismic acceleration mentioned in STE0320?. Is it Av=0.2SDS x density of liquid?.
Thanks in advance for any feedback.

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