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Trapezoidal combined footings are required when

Trapezoidal combined footings are required when Correct Answer Both 1 and 2

Whenever two or more columns in a straight line are carried on a single spread footing, it is called a combined footing.

Combined footings are provided only when:

i) When two columns are close together, causing overlap of adjacent isolated footings

ii) Where soil bearing capacity is low, causing overlap of adjacent isolated footings

iii) When the end column is near a property line so that its footing cannot spread in that direction.

Trapezoidal footing is provided when one column load is much more than the other.

Hence, Trapezoidal combined footing are required when the space outside the exterior column is limited and the exterior column is heavier.

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