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It can be calculated by dividing the foundation load by the contact area between the foundation and the soil. For example, if a strip foundation has a width of 1 m and a length of 10 m, the contact area is 10 m2. If the foundation load per unit length is 170 kN/m, the foundation stress is 17 kPa.

For the design of RCC footing as per the IS456 code the following 8 basic formulas are used which are given as per IS 456 standards. Area of footing = Total load/SBC. Soil pressure = qu = Total load/Area of footing. Factored shear force Vu1 = (quB/2) (B-C1-2d) One way shear resistance = Vc1 = ?cbd.

FOOTINGS Must be large enough to prevent the soil from being loaded to more than 2,000 pounds per square foot, with the bottom 48" below finished grade. For example, a simple 12' x 16' deck would require three 12" sono tube footings.

Depth of Footings Footings should extend to a minimum depth of 12 inches below previously undisturbed soil. Footings also must extend at least 12 inches below the frost line (the depth to which the ground freezes in winter) or must be frost-protected.

So, the area of the footing = (Total Load)/(Bearing Capacity). = (P + Load of footing)/(Bearing Capacity). = (P * 1.1)/qu.

Footing width can vary ing to the structure, site, and conditions. Under code, generally, one-story buildings with footings on undisturbed soil with LBVs between 1,500 and 4,000 should have a minimum width of 12 inches. Two-story buildings require a minimum of 15-inch wide footings for 1,500 LBV soil.

It can be calculated by dividing the foundation load by the contact area between the foundation and the soil. For example, if a strip foundation has a width of 1 m and a length of 10 m, the contact area is 10 m2. If the foundation load per unit length is 170 kN/m, the foundation stress is 17 kPa.