irishengdave
Structural
Hi -- I'm looking at a footing and checking overturning. Criteria as follows:-
1) Uplift = 200 kN
2) Shear = 100 kN
3) Weight Soil Backfill = 200 kN
4) Depth = 2 m
5) Width = 2m
Refer to sketch attached.
Question: Is the footing stable in overturning or not? Assume that loads are un factored and required FOS overturning = 1
I see two two scenario's
a) The 200 kN uplift cancels out the fill and concrete weight and it has no overturning resistance.
b) The 200 kN does not affect the overturning stability. The foundation is just "floating" with zero pressure underneath and the mass of the fill is still there and resist's the overturning.
This seems like a simple problem but I can't get my head around this as to what will happen here.
Comments welcome!
1) Uplift = 200 kN
2) Shear = 100 kN
3) Weight Soil Backfill = 200 kN
4) Depth = 2 m
5) Width = 2m
Refer to sketch attached.
Question: Is the footing stable in overturning or not? Assume that loads are un factored and required FOS overturning = 1
I see two two scenario's
a) The 200 kN uplift cancels out the fill and concrete weight and it has no overturning resistance.
b) The 200 kN does not affect the overturning stability. The foundation is just "floating" with zero pressure underneath and the mass of the fill is still there and resist's the overturning.
This seems like a simple problem but I can't get my head around this as to what will happen here.
Comments welcome!