In Technical Report 34 he provides assistance in the calculation of:
In his design concept, Westergaard assumes a concrete slab acts as a homogenous, isotropic, elastic solid in equilibrium with the reactional forces from the subgrade (that are proportional to the deflections of the slab).
Westergaard also introduced the concept of the ‘Modulus of Subgrade Reaction’, k, an important value to know when calculating the deflection in soil due to loading on the surface.
Westergaard also introduced the concept of the radius of relative stiffness, l, for ground supported slabs, which is determined in equation 20 (Chapter 7.5 TR34). This displays the distribution of elastic bending moments for internal loads (both singular and combined).