CMU Partition Wall Bracing at Metal Roof Deck

[Gopher13]

All,

How are interior non-load bearing cmu walls typically braced at the top when the roof structure is metal deck over steel joists? When the roof structure has been concrete, I have used the sandwich angle detail where the angles are anchored into the concrete, but in this case where there is just 20 ga. roof deck I feel like the roof deck would deform with any lateral load that is put on the angles? See the attached drawings. Thanks!

 

[XR250]

Probably with a 14ga angle with 4" or so legs along the deck you would be ok if it ain't too tall.
You could always add some tube steel in the ribs and attach red-iron angle to that (assuming the ribs are perp. to the wall as you drew)

 

[KootK]

Perhaps adapt something like this.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[msquared48]

I think I would add metal joist blocking between the Z sections attached to the roof diaphragm and screw the struts to the side of the blocking.

Mike McCann, PE, SE (WA)

 

[XR250]

@KootK - "remove after completion" seems to always be wishful thinking

 

[KootK]

@KootK - "remove after completion" seems to always be wishful thinking

Granted.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[EngineeringEric]

What about Kootks idea but place some compressible filler like a 1" x 4" wide strip of 1" foam board. something that can hold it in place and then squish if left in place?

Or use some deflection vertical deflection clips attached to the Zees and a rigid connection to the CMU... This will allow some rotation so you may need to tie the two kickers together horizontally mid height.?

Or bring the cmu to 2" below zee and use said vertical deflection clip directly

 

[Gopher13]

Great ideas, however, the cmu wall needs to extend up to the bottom of deck (minus 2 inches or so) for architectural reasons (sound and fire I believe).

 

[mike20793]

Use Koot's idea and just extend the CMU up to the height you need and attach the braces to the CMU with a clip angle. It's still braced and it's very similar to the detail I use.

Edit: Sorry, Eric. I didn't see your post before I responded and it's the same thing that I was getting at.

 

[thaidavid40]

Evaluate this sketch to see if it answers the mail for your application ...
Dave

Thaidavid

 

[wannabeSE]

What are the lateral loads? If there is only a 5 psf load and the wall isn't too tall, you may be able to use a detail similar to your original detail with sheet metal screws attaching the angles to the deck. If the building is in a high seismic area with tall walls and fully grouted masonry, the prying on the sheet metal screw into 20 ga deck probably won't work.