Determine the tensile stress imposed at day by a wheel load of 800 lb located at the edge of a concrete pavement with the following dimensions and properties.

Question

Pavement thickness = 10 inches
? = 0.15
Ec = 4.6 × 106 lb/in2
k = 160 lb/in3
Radius of loaded area = 3 inches

What will be an ideal response?

Answer 1

Determine the stress on the edge of the slab using Equation 20.9.



First, solve for the radius of equivalent distribution of pressure, b.

Since the radius of contact area, a = 3 in. < 1.724h = 1.724(10) = 17.24,



Next, solve for the radius of relative stiffness, l.



Now use Equation 20.8 to determine the tensile stress imposed.



?e = ((0.572)(800) / (10)2) [4log10(39.57 / 3.95) + 0.359)]

?e = 20.0 lb/in2

Therefore, the tensile stress imposed on this slab will be 20.0 lb/in2.