Design of Shallow Foundation (Isolated Footings)
Aim
Design a square footing for a column size of 400 x 400 mm.
Given condition
The compression axial load for the load combination of (1.5 DL + 1.5 LL) is 2000 KN.
The safe soil bearing capacity is 150 KN/m2 at a depth of 2 metres below E.G.L.
M25 concrete grade.
Calculation
- Sufficient anchorage for column steel into the footing
- Reinforcement arrangment
Provided a simple sketch showing the size of the footing, maximum and minimum depth of the section, flexural reinforcement in both directions and anchorage of column steel.
Result
Provided the following checks:
- If the gross bearing pressure under the footing is within safe bearing capacity
- Provide sufficient depth and longitudinal steel for resisting bending and shear
- Sufficient anchorage for column steel into the footing
- If the bearing pressure at column-footing joint is within 0.45 times the maximum concrete compressive strength