Isolated Footing Design
Geotechnical IS 456:2000~3 min
Design an isolated RCC footing for a column load as per IS 456:2000.
Formula
A_req = P / SBC; Mu = qu × (L-a)² / 8
Input Parameters
Results
Required Footing Area
4.40m²
Footing Size (L = B)
2.10m
Net Upward Pressure (qu)
204.55kN/m²
Required Depth (d)
219mm
Step-by-Step Method
- 1Assume 10% self-weight of footing: Total load = 1.1P.
- 2Required area = Total load / SBC.
- 3Footing size L = √(Area) for square footing.
- 4Net upward pressure qu = Pu / A.
- 5Design for bending moment at face of column.
Engineering Notes
- •Minimum depth of footing = 500 mm below NGL.
- •Minimum concrete cover = 50 mm for footings.
- •Check punching shear at d/2 from column face.
Code Reference
IS 456:2000
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