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RE: CMU wall reinforcing

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If the in-plane lateral loads are really low, is this really a shear wall? In other words, can the lateral force resistance be provided elsewhere? If the lateral force is resisted elsewhere, then the wall you described isn't a shear wall, and the rules change.

Keith Erick Fix
Principal Engineer
Red Pepper Consulting, Inc. 

10201 W. Markham Street
Suite 215
Little Rock, AR 72205

+1 (501) 227 7183 office
+1 (501) 350 3629 mobile
+1 (501) 319 7319 fax

-----Original Message-----
From: byainc(--nospam--at) [mailto:byainc(--nospam--at)] 
Sent: Tuesday, April 26, 2011 5:33 PM
To: seaint(--nospam--at)
Subject: Re: CMU wall reinforcing

Are you using running bond? If that's the case, yes. If you use stack bond, it's min 24". Running bonds are not as reliable.
Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Drew Morris <dmorris(--nospam--at)>
Date: Tue, 26 Apr 2011 13:25:27
To: SEAINT<seaint(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
Subject: CMU wall reinforcing

I have a pair of short special reinforced CMU walls that are being designed under SDC D.  Based on the masonry code (TMS 402-08), the vertical and horizontal spacing has to be less than the wall length/3 (  For a wall 2'-8" long, I come up with a spacing of 10.7" 
oc, i.e. every cell.  Am I interpreting this correctly.  There is minimal shear and for out of plane loading, the verts can be at 24" oc.

*Drew Morris, PE*| /Project Engineer/
BBFM Engineers, Inc. <>
510 L Street, Suite 200 | Anchorage, Alaska 99501
Ph: (907)274-2236 | Fax: (907)274-2520 | Web: <>


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