Ribbed concrete roof slab w/CMU infill?
Ribbed concrete roof slab w/CMU infill?
(OP)
I am investigating a roof design that I have not previously seen. The roof consists of a 2.5 in. slab cast with 6"x12" RC beams spaced at 21". Between the beams are 12"x8"x16" hollow core CMU blocks. I assume the CMU was cast with the concrete and are anchored in some fashion. My question is what was the purpose of adding the CMU, resulting in a large DL on the roof? Is the CMU providing any structural contribution?
Kelly Lyons, PE
Principal
www.sTrucTure-Tec.com





RE: Ribbed concrete roof slab w/CMU infill?
http://www.aircrete.co.uk/buildingwith/floors.htm
where the cmu turned sideways is slid into place and supports the floor. The cmu is then supported by beams at each end. I remember a web page that had a system designed for cmu but can't find it now. This is just a guess that came to mind.
RE: Ribbed concrete roof slab w/CMU infill?
The masonry, having irregularities, holes, etc. would be interlocked with the concrete such that when the formwork below was removed, the masonry just stayed put. Then you'd end up with a flat surface that could be plastered without constructing a secondary ceiling support system.
RE: Ribbed concrete roof slab w/CMU infill?
Kelly Lyons, PE
Principal
www.sTrucTure-Tec.com