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RE: dual system

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That is not a dual system. You will need to use the R value for light framed shear walls.
 To the best of my understanding you would need either a braced frame or a concrete shear wall _in line_ with the frame to consider it a dual system. Lateral separation is not acceptable except maybe a few feet

Mark E. Deardorff, SE
R & S Tavares Associates, Inc
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From: DA ENGINEERING [mailto:dnae(--nospam--at)]
Sent: Thursday, August 09, 2007 12:41 PM
To: seaint(--nospam--at)
Subject: dual system

just wonder what dual system?
is that means if I have residential  house one steel frame at front
and shear wall 20 apart in the same direction
consider a dual system and  I have to design the frame
 for 25% of base shear
section cbc 1629.6.5
it a house , flexible diaphragm
 Dave A.