Interactive Isolated Footing Design
Creator: Parag Pal
As per Limit State Method of IS 456:2000
Step 1: Determine Size of Footing
The plan area is based on the service load (column load + 10% self-weight) and the soil's safe bearing capacity to prevent soil failure.
Step 2: Calculate Net Factored Upward Soil Pressure
This is the ultimate pressure the footing must structurally resist. It's calculated from the factored column load and the actual footing area provided.
Step 3: Shear Design to Determine Footing Depth
The footing's thickness is governed by its ability to resist shear forces. Both one-way (beam action) and two-way (punching) shear must be checked.
Step 4 & 5: Flexural Design & Development Length
Steel reinforcement is calculated to resist the bending moment caused by the upward soil pressure. The length of the bars must also be sufficient to ensure proper anchorage (development length).
Step 6: Check for Load Transfer
The bearing pressure between the column and footing is checked to prevent crushing. Dowel bars are designed to transfer the load safely.
Quantity Estimation & Costing
Bar Bending Schedule (BBS)
| Mark | Description | Dia (mm) | Shape | Cut Length (mm) | No. of Bars | Total Length (m) |
|---|
Cost Estimation Summary
Final Design Summary & Detailing
Reinforcement Detailing (Plan View)
Reinforcement Detailing (Section View)
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