Property Line Conc. Foundation Shear Capacity
Property Line Conc. Foundation Shear Capacity
(OP)
Does anybody know the shear capacity of a continuous spread footing at the distance "d" from the inside face of the foundation wall.
The foundation is on line with the lot line, hence, there is only one projection at the bottom of the footing (to the inside) i.e. my footing is an "L" not an inverted "T"
I don't remember in Concrete Design classes anything mentioned about it, and am looking at an example in Leet's and Bernal "Reinforced concrete design" page 335, third edition, for a continous footing with projections to both sides. Their formula is as follows:
phi(Vc)= 0.85(2) (f'c)^0.5 (bw)d
Specific question, does that "2" in the formula correspond to the two planes when you are checking an inverted "T" footing.
Thanks for the patience.
RareBug
The foundation is on line with the lot line, hence, there is only one projection at the bottom of the footing (to the inside) i.e. my footing is an "L" not an inverted "T"
I don't remember in Concrete Design classes anything mentioned about it, and am looking at an example in Leet's and Bernal "Reinforced concrete design" page 335, third edition, for a continous footing with projections to both sides. Their formula is as follows:
phi(Vc)= 0.85(2) (f'c)^0.5 (bw)d
Specific question, does that "2" in the formula correspond to the two planes when you are checking an inverted "T" footing.
Thanks for the patience.
RareBug






RE: Property Line Conc. Foundation Shear Capacity
RE: Property Line Conc. Foundation Shear Capacity
RE: Property Line Conc. Foundation Shear Capacity
RE: Property Line Conc. Foundation Shear Capacity
Each shear plane resists a shear force at a distance d from the face of the wall (ACI318-99 11.1.3.1). At this distance from the face of the wall, there is a length of footing beyond that point towards the outside edge. This length has soil bearing pushing up on it.
Thus, the shear force applied at d from the face is the shear created by that upward bearing on the outer length of footing.
For an "L" type footing/wall condition, you still have that same width of footing beyond d-from-the-face on one side only and that should be checked just like the "T" condition. Each side only takes its applicable load.
RE: Property Line Conc. Foundation Shear Capacity
RE: Property Line Conc. Foundation Shear Capacity