The document summarizes the permissible stresses for tendons and concrete according to the ACI code. It outlines 3 stages: 1) After transfer of prestress force, 2) At service load, and 3) An escape clause allowing higher stresses if proven not to impair performance through testing or analysis. For each stage, it provides the stress limits for concrete in tables, including limits on compression, extreme fiber tension in precompressed zones. It also outlines permissible stresses in steel tendons, limiting stresses to 60% of yield strength and 80% of ultimate strength.

1. PERMISSIBLE FLEXURAL STRESSES IN TENDONS & CONCRETE ACCORDING TO ACI CODE PRESENTED BY TATHEER AKHLAQ 2006-MSC-CIVIL-STRU-08

4. PERMISSIBLE STRESS IN CONCRETE

7. Table 1 Permissible Stresses After Transfer Of Prestress Force

9. Table 2: Service Load Stress Limit cover requirements are met. with requirements stated elsewhere in the code, and where special realtionships shows that immediate and long time deflections comply on transformed cracked sections and on bilinear moment deflection of members ( except two way slab systems ) where analysis based 12√Fci' c. Extreme fibre stress in tension in precompressed tensile zone 6√Fci' b. Extreme fibre stress in tension in precompressed tensile zone 0.45 F ci ' a. Extreme fibre stress in compression shall not exceed the following 2. Stresses at service loads (after allowance for all prestress losses)

11. PERMISSIBLE STRESSES IN STEEL

13. Table 3: Permissible Stresses In Steel

15. THANKS