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Re: CMU Infills

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I think it's sort of taken care of by not having it listed as a recognized LFRS in the structural system tables in the code.

Then there are code provisions about interactions of different systems within a same direction of a building, on different and same lines of resistance, and by story.

It's in there (i.e., you need to model the building...if the infill walls are in contact with moment frames, your model better reflect that), but it just takes digging rather than blatantly saying in Code Commandment #  "Thou shall not use CMU infill walls in combination with Concrete Moment Frames.

I guess the point is, rather than try to capture every possible system name, the code attempts to say "you can't do this unless..." in more general terms


On Jan 28, 2008 2:15 PM, Alex C. Nacionales <anacionales(--nospam--at)> wrote:
Designing the frames for forces that will be created due engaging the infill CMU "infill" walls will be expensive. Creating a space between CMU infill  walls seems awkward. I wonder why a dangerous issue such as this was not taken care of by any structural code.
Alex C. Nacionales 
----- Original Message -----
Sent: Saturday, January 26, 2008 6:38 AM
Subject: RE: CMU Infills

I don't recall if there are actual code provisions, but there are certainly FEMA documents that discussion the issue of masonry infill walls in frames and how to retrofit or even design for them.  If I recall correctly, the main thing to try to do is leave enough isolation room between the frame and the infill walls to allow the frame to deflect as "desired" without "engaging" the infill wall...OR design the frame for the types of forces that will be created due to "engaging" the infill walls.
Adrian, MI
-----Original Message-----
From: Alex C. Nacionales [mailto:anacionales(--nospam--at)]
Sent: Friday, January 25, 2008 5:02 PM
To: seaint(--nospam--at)
Subject: CMU Infills

Dear Fellow Engineers,
     My RC design teacher has taught us has to ignore the effect of CMU infills on a RC frame because they will be crushed during a seismic event. Recent seminars I attended shows that cmu infills interferes with  frame action thus attracting more shear. Is there any code provision regarding on how to treat cmu infills in relation with RC frames or steel frames?
       Your assistance will much appreciated. Thanks.
     Alex C. Nacionales.