The equations 17 to 19 apply to the warping stresses in the longitudinal
direction in or nearby the centre of the concrete slab.
For calculation of the warping stresses in the transverse direction in or nearby
the centre of the concrete slab, in the equations 17 to 19 the slab length L has
to be replaced by the slab width W and the slab span L’ in the longitudinal
direction has to be replaced by the slab span W’ in the transverse direction.