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RCC Structures Design - Engineering

Q1:

If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

A D = 0.00775 aP

B D = 0.0775 aP

C D = 0.07775 aP

D D = 0.775 Pa

ANS:A - D = 0.00775 aP

To determine the depth of the foundation D for a plain concrete footing under a wall, we need to consider the upward pressure P on the slab and the projection a of the footing on either side of the wall. A common empirical relationship used in foundation design is: D=k×a×P Where:

  • D is the depth of the foundation,
  • a is the projection of the footing on either side of the wall, and
  • k is a coefficient that depends on the soil properties, foundation type, and other factors.
Given that the coefficients k and P are provided in the options, we can substitute them to find the correct expression for D. From the provided options: D=0.00775×aP Therefore, the correct expression for the depth of the foundation D is D=0.00775×aP.