Floor to floor CMU block 3

[JStructsteel]

When putting block floor to floor (existing floors) do you folks require an anchor at the top? Its interior so not a huge lateral load. Was showing a dowel at the bottom and a few vertical bars next to openings. Was wondering if a top dowel into the underside of the slab is necessary, or if it is, how to install.

Non seismic area, so no concern there.

Thanks

 

[phamENG]

A steel angle with epoxy or expansion anchors into the floor above is a good way to go. You can either put long slotted holes in the vertical leg and bolt it to the top of the new wall (makes injection and inspection of fire caulking, soundproofing, or other 'stuff' in the gap easier), or you can do two angles, one on each side that hold it in place through bearing in either direction.

 

[ntattose]

I have done what phamENG has described several time. Use L's on each side of the wall to create a homemade deflection track. This allows for resistance to lateral load and also allows for deflection of the floor above. The L's don't need to be continuous, just short clips at a reasonable spacing, like 4'-0".

 

[Once20036]

All walls need to be designed for an internal 5psf horizontal load.
Without a connection to the top slab that you`re asking about, what's the load path for this force?

Agreed with the two posts above re: how to accomplish this.

 

[JStructsteel]

Thanks, this is a existing elevator shaft, they are putting CMU up for the openings for a new one. Its at the corner of the building, so not too worried about floor deflection.

I think a plate or angle on the inside to hide it will be sufficient. At a 10' tall wall, the load is insignificant, but still want a positive connection.

My other thought is to anchor into the side walls, and span horizontal with a bond beam.

 

[jerseyshore]

I've done the double angles a lot as pham said.

Someone RFI'ed me with a substitute for my double angle detail last summer. I forget the product, but I think it was a rod coming down into the block from the floor above. Braced the top of the wall for the 5 psf pressure, but allowed deflection of the slab above. That was a concrete floor and a new building so it might be just for new installs only. Maybe someone here knows what I'm talking about.

 

[GC_Hopi]

Hohmann and Barnard have products, see below, but if the height is short then you can design the the interior partition walls as a cantilever. Main item is deflection at the top and cracking of the finish material.

 

[jerseyshore]

Yes the PTA's those were the ones we used recently. H&B has everything.

 

[structSU10]

On some of those walls you have rail and counterweight forces to resist. They are generally small and mostly at floor levels but depending on the elevators there is usually a dead end hitch or rail connection point that is not at a floor line.