For beams and one-way slabs, compressive stresses in concrete, based on the concrete section, are limited to f_cu. The increase to 0.40f_cu for certain portions of continuous members is not implemented.

For beams and one-way slabs, compressive stresses in concrete, based on the concrete sections, at the concrete section centroid are limited to 0.25f_cu.

Two-way slab compressive stresses in concrete, based on the concrete sections, at the concrete section centroid are limited to 0.24f_cu in the support zone and 0.33f_cu in the span zone [TR 43 Table 2].

For sections with multiple concrete mixes, the minimum f_cu is used to determine the limit stress and the peak stress reported may be approximate.

No check is made to ensure the cross section is post-tensioned.