# Design Of Grillage Foundation

|## Grillage Foundation Design:

Figure 1 demonstrates a simple design of a one tier grillage foundation for a steel stanchion. The bending moment and shear force required for the grillage beam design can easily be arrived by the following simple method.

Let, W = Load supported by one beam in N.

L = The length of the beam in m.

l = The length of the base plate in m.

Figure 1 also shows the load distribution. It is apparent the highest bending moment in the beam

= (W/2 * L/4) – (W/2 * L/4)

= W/8(L-l) in Nm

In the beam maximum shear force develops at the edge of the base plate. The upward pressure of soil on the beam = W/L N/m

Cantilever projection of the beam beyond the edge of the base plate

= (L-l/2)

Maximum shear force in the beam = W/L (L-l/2)

#### Also Read – Reinforcement Details In Columns

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