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Question
In Newmark’s influence chart for stress distribution, there are ten concentric circles and ten radial lines. The influence factor of the chart is
A.
0.1
B.
0.01
C.
0.001
D.
0.0001
Answer ( Option B)

0.01

Solution

Newmark’s influence chart: It is a graphical method used to compute vertical, horizontal and shear stress due to uniformly distributed load over an area of any shape or geometry, below any point that lies either below or outside the loaded area. It is based on Boussinesq's equation.
 
Stress below any point is calculated as :-
 
σ = 1/(m×n) × q × N
 
where,
 
m = No. of concentric circles, 
n = No. of Radial lines, 
q = Intensity of load, and 
N = Equivalent number of areas covered by plan area.
 
The product (1/m×n) is called influence factor.
 
Given: 
m = 10, and n = 10
 
∴ Influence factor = 1/(10×10) = 0.01

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