Upward Pressure for Footing Flexure and Shear
Upward Pressure for Footing Flexure and Shear
(OP)
Hey all,
If I have a continuous footing which has 14' of overburden cover on one side and only 3' on the other, can the weight of the soil itself be neglected to determine the upward pressure used for flexure and 1-way shear calcs?
If I have a continuous footing which has 14' of overburden cover on one side and only 3' on the other, can the weight of the soil itself be neglected to determine the upward pressure used for flexure and 1-way shear calcs?






RE: Upward Pressure for Footing Flexure and Shear
BA
RE: Upward Pressure for Footing Flexure and Shear
RE: Upward Pressure for Footing Flexure and Shear
Having said that, I haven't done one of these in about 13 yrs.
Don't forget to check your vertical wall for bending and shear from the lateral earth pressure, and axial load from gravity (wall weight and/or column loads).
tg
RE: Upward Pressure for Footing Flexure and Shear
RE: Upward Pressure for Footing Flexure and Shear
Is the wall laterally braced by a slab at the 3' and 14' levels?
BA
RE: Upward Pressure for Footing Flexure and Shear
I had to design for 2 different conditions with this wall. The first was a cantilever condition where the wall would be backfilled prior to being connected to a tension floor slab. The second condition was for once the wall was tied into the tension slab. I did end up running the statics twice. Once with service loads to determine bearing capacity. The second was with factored loads to determine upward pressure. I kept the overburen on the footing because I feel as though it causes bending in the footing and therefore should be accounted for. It didn't kill my design either. All I had to do was extend the bars in the toe to the back of the heel and that covered my flexure concerns.
RE: Upward Pressure for Footing Flexure and Shear
You are now talking about a cantilevered retaining wall required only until the floor slab is installed. You could use temporary supports, i.e. diagonal struts to deadmen to hold the wall until the floor slab is placed.
Alternatively, you might consider removing fill on the inside of the wall, using a structural slab where required.
BA