6.3 Design of trapezoid-shaped footings A combined footing will be trapezoid-shaped if the column that has too limited a space for a spread footing carries the larger load. ■ In this case the resultant of the column loads (including moments)will be closer to the larger column load,and doubling the centroid distance as done for the rectangular footing will not provide sufficient length to reach the interior column. The footing geometry necessary for a two- column trapezoid-shaped footing: 6.3 Design of trapezoid-shaped footings ▪ A combined footing will be trapezoid-shaped if the column that has too limited a space for a spread footing carries the larger load. ▪ In this case the resultant of the column loads (including moments) will be closer to the larger column load, and doubling the centroid distance as done for the rectangular footing will not provide sufficient length to reach the interior column. ▪ The footing geometry necessary for a two￾column trapezoid-shaped footing: