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RE: Spectral Acceleration using 2006 IBC

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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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