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RE: Spectral Acceleration using 2006 IBC

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That is correct.  Larry's original question was with regard to the values
from the USGS website.  The mapped spectral accelerations are typically
values at MCE which need to be adjusted for the site-soil conditions:
S_ms = Fa Ss
S_m1 = Fv S1
Therefore, design spectral response is 2/3 of those values.

David A. Topete, SE


-----Original Message-----
From: John Atilano [mailto:jatilano(--nospam--at)laneengineers.com] 
Sent: Friday, July 13, 2007 3:41 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Spectral Acceleration using 2006 IBC

I thought we were to use the 2%POE in 50 years since it is the max
considered earthquake.  The design is then 2/3 of the MCE which is the
reason for the equations Sds=2/3*Sms and Sd1=2/3*Sm1

John Atilano, P.E.

-----Original Message-----
From: David Topete [mailto:dtopete(--nospam--at)gfdseng.com] 
Sent: Friday, July 13, 2007 3:10 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Spectral Acceleration using 2006 IBC


I believe the 10%POE in 50 years ( = 475 yr return period) is your
design
earthquake.  The 2% in 50 is the Max considered earthquake.
The design is 2/3 of MCE.

David A. Topete, SE
-----Original Message-----
From: Larry Hauer [mailto:lrhauer(--nospam--at)hotmail.com] 
Sent: Friday, July 13, 2007 3:03 PM
To: seaint(--nospam--at)seaint.org
Subject: Spectral Acceleration using 2006 IBC

To get the long and short spectral accelerations for designing
earthquake 
forces I have gone to the USGS website with the required latitude and 
longitude. However, the website lists 2 values for each, a 10%PE in 50
yrs. 
and a 2%PE in 50 years. Which of these sets of values am I to use when 
designing to the 2006 IBC?

Thanks in Advance,

Larry Hauer S.E.

_________________________________________________________________
http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migr
atio
n_HM_mini_2G_0507


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