(a) Strip footings
(b) Isolated footings
(c) Combined footings
(d) Mat foundations
(e) Grade beams
(f) Pile caps
(h) Drilled piers
Table 18.104.22.168—Location of critical section for Mu
|Supported member||Location of critical section|
|Column or pedestal||Face of column or pedestal|
|Column with steel base plate||Halfway between face of column and edge of steel base plate|
|Concrete wall||Face of wall|
|Masonry wall||Halfway between center and face of masonry wall|
(a) Reinforcement in the long direction shall be distributed uniformly across entire width of footing.
(b) For reinforcement in the short direction, a portion of the total reinforcement, γsAs, shall be distributed uniformly over a band width equal to the length of short side of footing, centered on centerline of column or pedestal. Remainder of reinforcement required in the short direction, (1 — γs)As, shall be distributed uniformly outside the center band width of footing, where γs is calculated by:
where β is the ratio of long to short side of footing.
(a) Entire reaction from any pile with its center located dpile/2 or more outside the section shall be considered as producing shear on that section.
(b) Reaction from any pile with its center located dpile/2 or more inside the section shall be considered as producing no shear on that section.
(c) For intermediate positions of pile center, the portion of the pile reaction to be considered as producing shear on the section shall be based on a linear interpolation between full value at dpile/2 outside the section and zero value at dpile/2 inside the section.