Multiple choice

A concrete column carries an axial load of 450 kN and a bending moment of 60 kN at its base. An isolated footing of size 2 m by 3 m, with 3 m side along the plane of the bending moment, is provided under the column. Centres of gravity of column and footing coincide. The net maximum and the minimum pressures in kN/m2 on soil under the footing are respectively

  1. 95 and 55

  2. 95 and 75

  3. 75 and 55

  4. 75 and 75
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A Correct answer
Explanation

The pressure under the footing is given by q = P/A +/- M/Z. With P=450, M=60, A=6, and Z=bd^2/6, the maximum and minimum pressures are calculated.

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