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Footing Size Formula:
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The footing size calculation determines the required area of a foundation based on the structural load and the soil's bearing capacity. This ensures the foundation can safely support the structure without excessive settlement.
The calculator uses the footing size formula:
Where:
Explanation: The formula calculates the minimum area required to distribute the structural load safely over the soil without exceeding its bearing capacity.
Details: Proper footing size calculation is crucial for structural stability, preventing foundation failure, and ensuring safe load distribution to the soil. It's a fundamental step in foundation design for buildings and structures.
Tips: Enter the total load in kN and the soil bearing capacity in kN/m². Both values must be positive numbers. The calculator will determine the required footing area in square meters.
Q1: What factors affect soil bearing capacity?
A: Soil type, moisture content, compaction, depth of foundation, and soil composition all influence the soil's bearing capacity.
Q2: Should safety factors be applied to this calculation?
A: Yes, most engineering applications apply a safety factor (typically 2-3) to the soil bearing capacity to account for uncertainties and ensure long-term stability.
Q3: How is total load calculated for a structure?
A: Total load includes dead loads (permanent structure weight), live loads (occupancy and use loads), and environmental loads (snow, wind, earthquake).
Q4: Can this formula be used for all foundation types?
A: This formula is primarily for spread footings. Other foundation types (pile, raft, strip) require different calculation methods.
Q5: How often should soil testing be done for accurate SBC values?
A: Soil testing should be conducted at each construction site and at multiple locations to account for soil variability. Professional geotechnical analysis is recommended.