House with partial basement 1

[n3jc]

I have brick house with partial basement. What to do with foundations? What do you guys do/suggest in cases like this? I attached a picture.
I have no data on soil - there hasnt been any geotechnical research made to evaluate the soil bearing capacity.
I was thinking about designing a slab for ground floor and under basement too.

 

[n3jc]

Great! Thank you very much sir.
it looks simple - easy to do. I understand - reinforcement from the stem wall to the slab is JUST for connection - its not designed for (shear?) force, because there should be non - soil as support.

But if that is so simple, and there is no problems (im not sure about it because of settlements and cracking may occur)... why bother with stepped foundation anyway? Its much more expensive and difficult to do?

 

[KootK]

You're most welcome n3jc.

I understand - reinforcement from the stem wall to the slab is JUST for connection - its not designed for (shear?) force, because there should be non - soil as support.

The rebar that I showed was just what I'd normally do for detailing purposes: slab crack control and creating a nominal, horizontal, shear friction joint to allow the slab to restrain the basement wall from flopping to the right. In all likelihood, there's already a main floor connection on the basement side doing that job. There would be some transverse slab shear in option #1 as the thickened slab must be designed as a bridging element not benefiting from soil support adjacent to the wall.

But if that is so simple, and there is no problems (im not sure about it because of settlements and cracking may occur)... why bother with stepped foundation anyway? Its much more expensive and difficult to do?

The stepped footings and the slab on grade details solve two independent problems. The stepped footing prevent differential settlement issues between the primary structures of the main building and garage: exterior walls, floor and roof framing. The slab on grade details keep there from being a bump in your floor at the transition between structures. Neither the stepped footings nor the slab on grade details do anything to address the other's problems.


I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.