# Bearing Capacity of Foundations Subjected to Eccentric Loads

Research and observations of Meyerhof (1953, 1963) indicate that effective footing dimensions obtained (Fig. 12.14) as

The methods of determining the effective area of a footing subjected to eccentric loadings have been discussed earlier. It is now necessary to know the maximum and minimum base pressures under the same loadings. Consider the plan of a rectangular footing given in Fig. 12.15 subjected to eccentric loadings.
Let the coordinate axes XX and YY pass through the center O of the footing. If a vertical load passes through O, the footing is symmetrically loaded. If the vertical load passes through Ox on the X-axis, the footing is eccentrically loaded with one way eccentricity. The distance of Ox from O, designated as ex, is called the eccentricity in the X-direction. If the load passes through O on the 7-axis, the eccentricity is e in the F-direction. If on the other hand the load passes through 0 the eccentricity is called two-way eccentricity or double eccentricity.
When a footing is eccentrically loaded, the soil experiences a maximum or a minimum pressure at one of the corners or edges of the footing. For the load passing through O (Fig. 12.15), the points C and D at the corners of the footing experience the maximum and minimum pressures respectively.

When ex or e exceed a certain limit, Eq. (12.39) gives a negative value of q which indicates tension between the soil and the bottom of the footing. Eqs (12.39) are applicable only when the load is applied within a limited area which is known as the Kern as is shown shaded in Fig 12.15 so that the load may fall within the shaded area to avoid tension. The procedure for the determination of soil pressure when the load is applied outside the kern is laborious and as such not dealt with here. However, charts are available for ready calculations in references such as Teng (1969) and Highter and Anders (1985).

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