Depth of footing for basement
Depth of footing for basement
(OP)
Hey all,
In calculating bearing capacity and/or settlement, there is a variable of Df or depth of footing.
If you have a basement that is 10 feet deep with a concrete floor slab on the inside with the top of slab 2 feet above the bottom of footing, is the depth of footing 10 feet or 2 feet?
In calculating bearing capacity and/or settlement, there is a variable of Df or depth of footing.
If you have a basement that is 10 feet deep with a concrete floor slab on the inside with the top of slab 2 feet above the bottom of footing, is the depth of footing 10 feet or 2 feet?
RE: Depth of footing for basement
A Member of
www.civilvillage.com
RE: Depth of footing for basement
Thanks for the reply. Your answer is what I thought would be correct.
RE: Depth of footing for basement
For instance, on a wide reinforced earth wall embankment -walls on both sides of the carriageways, the BS codes and others talk about traditional bearing capacity. A good many authorities, though, permit the safety factor to be 2 on shear bearing capacity rather than 3. I personally favour doing a global slope stability analysis to see if the situation is safe or not.
Before I get jumped on, I am making the distinction between shear bearing capacity and allowable bearing pressure (net). See other threads about it.
RE: Depth of footing for basement
With regard to settlement, the correct approach will be dependant on other factors such as whether the underlying soil is cohesive or granular and whether you are dealing with re-development of an old existing basement or constructing a foundation within a new excavation.
RE: Depth of footing for basement
...but, the bearing capacity is not going to be your critical parameter as BigH said. Go ahead and compute it though, for the exercise.
RE: Depth of footing for basement
I agree with BigH, use 2 ft.