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Combined footings
#1
. Combined footings are footings that support more than one column or wall.

. Combined footings can be used in case :

1. an exterior column that is immediately adjacent to a property line where it is
impossible to use an individual column footing.
2. two columns that are closely spaced, causing their individual footings to be closely
spaced.

. The choice of which shape (rectangular or trapezoidal) to be used is depends on the difference ¡n column loads and on physical/ dimensional limitations.

. The physical dimensions (except thickness) of the combined footing are generally established by the soil bearing capacity of the soil.

. In addition, the centroid of the footing area should coincide with the line of action of
the resultant of the two column loads.

. These dimensions are determined using service loads in combination with an
allowable soil bearing capacity.
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