2. Definition:
Footings are structural members used to support
columns and walls and to transmit and distribute their
loads to the soil in such a way that the load bearing
capacity of the soil is not exceeded, excessive
settlement, rotation are prevented and adequate
safety against overturning or sliding is maintained.
3.
4. Types of isolated column Footing
1. Pad footing
2. Sloped footing
5.
6. Steps for Design of isolated footing
1. Size of footing
2. Net upward Pressure
3. Bending Moment
4. Depth of footing
5. Reinforcement
6. Check for one-way shear
7. Check for two-way shear
8. Check for development Length
9. Load transfer for column to footing
7. Example:
Design an isolated square footing for a square column
400mm*400mm for axial load of 800kn.Use concrete
grade M-20 and Fe-250 steel grade. Take safe bearing
capacity of soil 120kn/m².Check for shear is not
required. Also draw neat sketch showing sectional
elevation and plan.
