31) What is the intensity of pressure below a point load where r is equal to zero on the axis of loading?
a) σ_z= (0.4775Q )/(z^2 )
b) σ_z= (0.7Q )/(z^2 )
c) σ_z= (0.4775Q )/( z^3 )
d) σ_z= (0.8Q )/z
Anonymous Answered question January 5, 2021
Answer: a) σ_z= (0.4775Q )/(z^2 )
Explanation:
The formula of Boussinesq’s vertical stress is,
σ_z= 3Q/(2π z^2 ) 〖{1/(1+〖(r/z)〗^2 )}〗^(5/2)
Put, r is equal to zero.
We will get,
σ_z= (0.4775Q )/(z^2 )
Anonymous Answered question January 5, 2021
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