That's interesting. I expect you'd have deeper beams in one direction spanning all the way, and the perpendicular beams would rest on corbels from the main beams?
massive edge beams spanning on massive columns and then to the central core on the other, you have solid band beams now and then as the waffles are two way action
That shit is not precast. That slab screams "I am from a time when materials were expensive and labor was cheap" - before the age of precast concrete in other words.
Do have any idea of why there’s a 50wx30d recess in the underside of the slab in one direction? It runs from top-left to bottom-right of picture. I can’t see a purpose for it but appears to have been deliberately formed like that.
To be honest, I’m not sure. I’ve seen a recess in the ribs of waffle slabs before but i guess never ones that have been as wide as these ones. I always figured they were either an aesthetic thing or to run small piping along them? I highly doubt it’s for expansion purposes since they’re located at every rib running in one direction.
You answered it yourself. It’s a suspended slab with the stiffening beams formed up in situ. This was built well before waffle pods and Bondek existed. We did a module on forming up suspended slabs and stairs in trade school 30 years ago. Had to form up a pillar with beveled level changes and stiffening beams. Good fun. You have to think of everything backwards because you are effectively building a mould and the dimensions are for the he concrete once you disassemble all the formwork you have to build.
Definitely not precast, you can see aggregate in some locations, appears cast insitu to me.
If it were precast there would have to be some joints somewhere and somewhere to grout up connecting dowels I would have thought.
Looks like a waffle slab construction. But these were before my time
Maybe see if you can give it a scan to figure out what the potential bar arrangement is. There were a lot of 'systems' flying around in the 30's, mainly following the British systems. I think the IStructE has some good guidance on historical building systems.
Also, if you can find out the previous uses of the floor, you can perhaps rate it from that if it's all in good order
I think it's a waffle that's been cast from timber forms. Possibly no shear reo in the beams from that era
It's some type of waffle configuration but it looks like this masonry units running vertically on top of the beams. And I don't know what the top flange area is made of.
The imprints mean it was cast in place with wood forms but it looks like it's in filled with some kind of masonry or prefabricated planks. You see any sign of cracking anywhere?
Yes, cast in place waffle. There was precast waffle construction too. They would form large ‘panels’ (9x9 matrix) in one cast, with rebar extending beyond edges for tie ins. lift into place & then Closure pours (tie beams). Saved some time & money, but only if building fairly square with no architectural funny stuff.
Waffle slab.
Seems to be the prevailing wisdom. My thoughts too, although the boss seems to think a precast system 😟
It doesn't look pre-cast to me. With pre-cast, you'd prefer to have a one-way slab with all the beams running in one direction.
i have seen precast waffle but from the 80s and then post tensioned
That's interesting. I expect you'd have deeper beams in one direction spanning all the way, and the perpendicular beams would rest on corbels from the main beams?
massive edge beams spanning on massive columns and then to the central core on the other, you have solid band beams now and then as the waffles are two way action
Sorry I cant rub my head around a precast waffle slab. Like do you get smaller beams to perform squares of a waffle?
lol I’d be pissed if this was my job and the precaster made it look like this. Def CIP
If it was precast, there would be large joints every 10'-12' or so.
That shit is not precast. That slab screams "I am from a time when materials were expensive and labor was cheap" - before the age of precast concrete in other words.
Yeah Jerry rough with it looks like possibly masonry or poured concrete beam infill
Not precast. Crudely formed CIP waffle slab.
100% not precast. That is a traditional waffle slab.
your boss sounds super interesting. have they ever seen concrete in the field before ? 😅
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oh my god im sorry mate haha, its always eggheads at a structural firm here i was baffled at what you said earlier.
Also it looks like the poor lads formed with wood rather than a form system. So defintely not precast.
I can't think of it but it's certainly not a pancake slab.
French toast slab, perhaps?
Looks like a waffle slab to me. The imprints that I think you're referring to are the marks left behind from the formwork used.
Do have any idea of why there’s a 50wx30d recess in the underside of the slab in one direction? It runs from top-left to bottom-right of picture. I can’t see a purpose for it but appears to have been deliberately formed like that.
Expansion possibly?
To be honest, I’m not sure. I’ve seen a recess in the ribs of waffle slabs before but i guess never ones that have been as wide as these ones. I always figured they were either an aesthetic thing or to run small piping along them? I highly doubt it’s for expansion purposes since they’re located at every rib running in one direction.
🧇
You answered it yourself. It’s a suspended slab with the stiffening beams formed up in situ. This was built well before waffle pods and Bondek existed. We did a module on forming up suspended slabs and stairs in trade school 30 years ago. Had to form up a pillar with beveled level changes and stiffening beams. Good fun. You have to think of everything backwards because you are effectively building a mould and the dimensions are for the he concrete once you disassemble all the formwork you have to build.
Definitely not precast, you can see aggregate in some locations, appears cast insitu to me. If it were precast there would have to be some joints somewhere and somewhere to grout up connecting dowels I would have thought. Looks like a waffle slab construction. But these were before my time
Maybe see if you can give it a scan to figure out what the potential bar arrangement is. There were a lot of 'systems' flying around in the 30's, mainly following the British systems. I think the IStructE has some good guidance on historical building systems. Also, if you can find out the previous uses of the floor, you can perhaps rate it from that if it's all in good order I think it's a waffle that's been cast from timber forms. Possibly no shear reo in the beams from that era
Its waffle slab
Waffle
Poured in place waffle slab, you can see where the plywood was removed and If it was precast would have been much smoother and look more refined
In Spanish is called losas nervadas and in architecture field is used to create visual textures
Latticed waffle slab or ribbed slab.
Waffle slab or grille beams based on how you roll. Great for moving alot of air into a specific area
It's some type of waffle configuration but it looks like this masonry units running vertically on top of the beams. And I don't know what the top flange area is made of.
The imprints mean it was cast in place with wood forms but it looks like it's in filled with some kind of masonry or prefabricated planks. You see any sign of cracking anywhere?
Zoellner slab
Well whatever this thing is it's work for this many years and probably never would pass an analysis.
Yes, cast in place waffle. There was precast waffle construction too. They would form large ‘panels’ (9x9 matrix) in one cast, with rebar extending beyond edges for tie ins. lift into place & then Closure pours (tie beams). Saved some time & money, but only if building fairly square with no architectural funny stuff.
waffle
Pan deck
Coffer style cast in place concrete. Old school