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RE: Moment Resisting Frame

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Apparently you are referencing an older code.  The use of Rw and the term seismic "zones" has been discontinued for quite some time. 
That said, if you are in a region of low seismic risk as set forth in ACI 318-05 Section, you do not need to design for the seismic provisions of Chapter 21.  But you may have some detailing to which you need to comply which is listed in Section 

Regards, Harold Sprague

Date: Thu, 4 Dec 2008 19:40:33 -0800
From: engr_mondo(--nospam--at)
Subject: Moment Resisting Frame
To: seaint(--nospam--at)

For the design of concrete structures located in the arabian peninsula- what does other consider for the "moment resisting frames-Rw" (ordinary or intermediate?) specifically in Zone "0" areas. Also, there's a guide to use a minimum Zone to this areas, termed as "ZAG" with equivalent Ca and Cv values (again using moment resisting frames, is it ordinary or intermediate?). Thanks for any advice.

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