Question

There are two footing resting on the ground surface. One footing is square of dimension B. The other is strip footing of width B. Both of them are subjected to a loading intensity of q. The pressure intensity at any depth below the base of the footing along the centre line would be

• A.
  Equal in both footings
• B.
  large for square footing and small for strip footing
• C.
  large for strip footing and small for square footing
• D.
  More for strips footing at shallow depth $(\le B)$and more for square footing at large depth (>B)

Answer 1

The correct option is C

large for strip footing and small for square footing
By newmarks's method, pressure intensity at any depth 'Z' is given by
${\sigma }_z=q\times N\times 0.005$
Where
q = loading intensity
N = Number of influence blocks enclosed by the outline of loaded area.
Therefore, the value of N is definitely greater for strip- footing than square footing.
Hence, pressure intensity at any depth 'z' is greater for strip footing