Types of isolated footing and design
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Footings are structural members that support columns and walls and transmit their loads to the soil in a way that does not exceed the soil's load bearing capacity or cause excessive settlement or rotation. There are two main types of isolated column footings: pad footings and sloped footings. The design process for isolated footings includes determining the size, net upward pressure, bending moment, depth, reinforcement, and load transfer requirements. The example provides specifications to design an isolated square footing to support a 400mm x 400mm column with an axial load of 800kn using M-20 concrete and Fe-250 steel, accounting for a soil bearing capacity of 120kn/m2.
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Types of isolated footing and design
- 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.
- 4. Types of isolated column Footing 1. Pad footing 2. Sloped footing
- 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.
- 13. Thank You