Combined footings are designed keeping the following aspects in view:
- The shape of the footing is so selected such that the centre of gravity of the column loads and of soil reaction remains in the same vertical line. Unusually a rectangular or trapezoidal shape of foundation will generally satisfy this requirement.
- The area of the combined footing should be equal or greater than the ratio of the total load and the bearing capacity of the soil.
- The combined footing is treated as an inverted floor, loaded by earth reaction and supported by columns.
Other procedure adopted for column footing may be adopted here too.
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