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dual system

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Hi
 
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
 
Thanks
 Dave A.