Here in the U.S., pretty much all the houses, even those that are made of brick, have framed floors, meaning there are 2 x (usually 10) joists from one side of the house to the other and then OSB subfloor on top that, then finish flooring.
I understand that it is different in big buildings where they actually have concrete floors between stories.
Now, I am contemplating a house design. I would like to run PVC pipe through the floor in the finished basement so that I can have solar heated floor that water runs through. The basement floor would have to be concrete anyway. But I would also like to have the same pipes heating the second story and, with joists going across, it will be difficult to run the pipe in a spiral pattern. So I was thinking, why not make the basement basically a concrete bunker with a concrete slab on top, as opposed to just having beams and plywood separate it from the second story, and have pipes run through that platform. I understand the slab form would have to be supported by posts from the basement and have elaborate reinforcement. The basement walls would be concrete blocks.
Since I really don't know anybody who built a single family residence this way in the U.S. (even though in the rest of the world EVERYBODY pretty much does), I was wondering about the pros and cons of this design. From there on upstairs, the house would be regular stick framing construction [2x6 (cold climate, more insulation), OSB sheathing, cedar siding etc).