Compressive stresses in concrete based on the cracked concrete section at transfer of prestress are limited to the values in Fig. 8 for post-tensioned work.

If the limit stress is exceeded then reinforcement is added as required to limit the concrete stress; depending on the bending moment and axial forces, either compression reinforcement, tension reinforcement or both will be added.

For sections with multiple concrete strengths, the section limiting stress is reported as the smallest (absolute value) stress limit of all of the individual concrete areas.

The average of the top and bottom concrete stress in the cracked section is limited to the direct compressive stress limit of 0.8 times the value from Fig. 8.