RE: dual system

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
9815 Carroll Canyon Road
Suite 206
San Diego, CA 92131
Phone: 858-444-3344
Phone: 209-863-8928
Cell: 209-765-5592
mark@rstavares.com
www.rstavares.com

 

CONFIDENTIALITY AND SECURITY  NOTICE:
This e-mail, including any attachments, may contain confidential and proprietary information and may be legally privileged or otherwise protected by law. It may be read and used solely by the intended recipient(s), and any review, use or distribution by others is strictly prohibited. If you are not an intended recipient, please notify us immediately by replying to the sender and delete this e-mail, including any attachments, from your system immediately without reading, copying or distributing them. Thank you for your cooperation. R&S Tavares Associates Inc. and its client retain all proprietary rights they may have in the information.

 

---

From: DA ENGINEERING [mailto:dnae@cox.net]
Sent: Thursday, August 09, 2007 12:41 PM
To: seaint@seaint.org
Subject: dual system

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.