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@laneengineers.com]
Sent: Friday, July 13, 2007 3:41 PM
To: seaint@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@gfdseng.com]
Sent: Friday, July 13, 2007 3:10 PM
To: seaint@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@hotmail.com]
Sent: Friday, July 13, 2007 3:03 PM
To: seaint@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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