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Process of design of Column Footings Foundation Design

Here’s a stepwise manual to Column Footing Design - Column Footing Section and Plan | Foundation Design.

Measure A:
Area needed for footing
Square is equal to B is equal to (w + w1)/P0

Wherein, Po is equal to soil safe bearing capacity
w1 is equal to footing self weight
w is equal to footing self weight
With regard to Rectangle is equal to B/D is equal to b/d
A is equal to b x d
Total rising pressure at the footing
q/p is equal to W/A

Measure 2:

Bending Moment Critical section for highest bending moment is obtained at the column face with regard to a square footing,
Mxx is equal to q x B/8 (L – a)2
Mxx is equal to q x L/8 (B – b)2
Myy is equal to q x B/8 (L – a)2

Measure 3:

To set the footing depth must be higher of the subsequent:
Measurement / Depth as of bending moment contemplation d is equal to square root (M/Qb)
wherein, Q is equal to needed factor moment
Measurement / Depth as of shear contemplation

Verify for one way shear
Verify for punching shear or two way shear
Critical shear with regard to one way shear is contemplated on a distance “d” out of column face.
Shear force, V is equal to qB [ ½(B – b) d]
Minimal shear stress, Tv is equal to k . Tc
Tc is equal to 0.16 square rootfck

Measure 4:

Verify for two way shear
Critical section with regard to two way shear is contemplated on a span on a span d/2 out of the entire column faces

SF, V is equal to q [B2 – (b + d)2]
SF, V is equal to q [L x B – (a + d)(b + d)]
Minimal shear stress, Tv is equal to V/2((a+d)(b+d)d) -- [with regard to a rectangle
Tv is equal to V/4((b+d)d) ——- [with regard to a square
Tv is equal to k . Tc
k is equal to 0.5 + Beta is greater than 1 ; [Beta is equal to column sides ratio
Tc is equal to 0.16 square rootfck
Steel Area, Ast is equal to M/((sigma)stjd)

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