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Module 4: Pavement Design
Lecture 29 Rigid pavement design

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# Wheel load stresses - Westergaard's stress equation

The cement concrete slab is assumed to be homogeneous and to have uniform elastic properties with vertical sub-grade reaction being proportional to the deflection. Westergaard developed relationships for the stress at interior, edge and corner regions, denoted as in kg/cm respectively and given by the equation 1-3.
 (1)

 (2)

 (3)

where is the slab thickness in cm, is the wheel load in kg, is the radius of the wheel load distribution in cm, the radius of the relative stiffness in cm and is the radius of the resisting section in cm