Columns are used to support the cantilevered load of a building, in this case the Verandah and the Terrace.
The load from an isolated column is distributed into the soil below by providing square, rectangular or circular column footing. The footing as shown in the picture below is a large flat slab of R.C.C. The depth of the footing slab must be sufficient to resist the tendency of the column to penetrate or punch through it.
The load from an isolated column is distributed into the soil below by providing square, rectangular or circular column footing. The footing as shown in the picture below is a large flat slab of R.C.C. The depth of the footing slab must be sufficient to resist the tendency of the column to penetrate or punch through it.
The depth of the footing is based on the punching shear and maximum bending moment in the footing. The shear and bending moment are caused on account of net upward pressure of the soil below. Since the weight of the footing acts downwards, while the net upward pressure acts upwards, the self-weight of the footing is excluded while computing the net upward pressure due to the soil.
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