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Another Seismic Design Example

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Does anyone know why in the “2006 IBD Structural/Seismic Design Manual Vol. 2” same problem as earlier stated, see below, the duration of load, CD­, was used as 1.33 instead of the 1.6 that the NDS allows?






From: ECVAl3(--nospam--at) [mailto:ECVAl3(--nospam--at)]
Sent: Friday, February 15, 2008 4:24 PM
To: seaint(--nospam--at)
Subject: Seismic Design Example


For those of you that have and understand the "2006 IBC Structural/Seismic Design Manual Vol.2" I have a question.

On page 32 to determine the Anchorage at A on a perforated shear wall:

Going from the formula  (0.9-0.2*SDS)*D + Wo*QE

Wo = 3.0,   SDS = 1.19

they suddenly go to the formula  (0.9-0.2*SDS)*D + Wo*E

Putting the numerical values in they get  (0.9-0.2*1.19)*D + 0.66*D


My question is, how did they get 0.66*D from Wo*QE or Wo*E  ?

Can anyone shed some light on this for me?


Thank you,


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