SOG Design

[Lot2Learn]

Is there a standrad design method for slab on grade? I need to determine if a 5" SOG will be able to hold a 6"x12' tall non-load bearing cmu wall (all new construction).

 

[Lot2Learn]

Also: Is it necessary to brace all non-loadbearing partition walls at the top? There are some 4"/6" toilet partitions which are not full height. How do I, or do I need to brace them at the top and dowel them into the floor below?

 

[Lion06]

Look at ACI 301 and aCI 360.

For what it's worth, our typical detail for non-load bearing CMU partitions has a thickened slab under it.

Yes, the wall needs to be braced at the top. I usually provide a bond beam at the top with angles connecting the bond beam to the structure above. The vertical legs gets slotted holes to allow the structure above to deflect without loading the wall.

 

[TXStructural]

IBC requires interior partitions greater than 6 feet tall be designed for 5 psf "wind". Partitions should be braced such that if a person leans or falls against them, they do not collapse or displace. If they have ADA handrails or such, design for these loads as well.

If the walls can work with these and other required loads without being braced, then you are OK without bracing.

 

[Lion06]

That 5psf is actually a LL, not a wind load.

 

[a2mfk]

Agree with Lion, with CMU partition walls we always use thickened slab footings. For cantilevered CMU walls where you cannot brace the top like Lion explained, such as with a toilet partition, you have to design vertical reinforcing in grouted cells for 5psf lateral which with something like 4" CMU can be harder than you would think. You may be able to tie perp. walls together and use a bond type scheme as well...

If you have to support the walls on plain concrete slabs there are some good design methods in Army/Navy publications, I can look it up later if you cannot easily find this online.

 

[msquared48]

Depending on the seismic region, the width of the block, and the level of grouting, seismic on the wall may govern over the 5 psf figure.

Remember that figure is only the minimum to use.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[a2mfk]

Good point Mike.

 

[kaisersoze]

Here is a useful link from a previous discussion. Check out JAE's post in particular.

http://www.eng-tips.com/viewthread.cfm?qid=169967&page=9

Kaiser