Considering the initial geometric deflection, the theoretical ultimate load is obtained based on the yielding criterion of the cross-sectional edge stresses.

The influence of geometric size, material properties of the slabs, inhomogeneous subgrade, sleeper beam and bituminous overlay on the bending stresses and deflection is investigated.

These formulae can be used as an analytic solution for quickly estimating the geometric aberrations of a known deflection system and checking the related computer program.