1. Pre-stressed Steel System Post Tensioned Slab Case Study: K- Financial Tower

2. K- FINANCIAL TOWERS

3. BENEFITS  Less Columns  Less Beams  Thinner slabs  Controlled deflection  Flexibility of Layout & Services  Lighter Structure  Less Foundations  Less Rebars  Less Workmanship  Better Durability  Quicker turn-around of the Formwork  Fast Construction  Cost Saving

4. PRINCIPLES OF PRESTRESSING

5. Illustrative example  Illustrative P 2 P cos  For harped profile   P

6. W Vd Va P P Free-body diagram of tendon Free-body diagram of beam after removal of tendon Force system between tendon and beam P Va W Vd P Illustrative example  Illustrative

7. BONDED Bond is achieved throughout the length of the tendon by a cementitious matrix called grout PT force along the tendon is a function of the deformation of the concrete  How it is bonded:

8. K - FINANCIAL TOWERS TYPICAL FLOORS

9. SLAB MESHING

10. LATITUDE TENDONS

11. LONGITUDE TENDONS

12. Ultimate moment Mx

13. Ultimate moment My

14. Service Bottom X stress Plan

15. Service Bottom Y stress Plan

16. Service Top X stress Plan

17. Service Top Y stress Plan

18. Long term deflection plan

19. EXECUTION By nominated local installation agent

20. SUMMARY OF POST-TENSIONING EXECUTION

22. POST-TENSIONING INSTALLATION FORMWORK SIDE-SHUTTER FIXING OF ANCHORS MARKING OF THE SLAB TENDON INSTALLATION PROFILING & FINISHING

23. CHECKING BEFORE THE CASTING No. OF ANCHORS AND TENDONS PROFILES GROUT VENTS BURSTING REINFORCEMENT Additional Rebar (Bursting, Punching Shear) PROPPING AND FORMWORK

24. CASTING PROPER VIBRATION AROUND THE ANCHORS CONCRETE TO BE PLACED WITHOUT DAMAGING THE TENDONS PROPER CURING OF THE CONCRETE AFTER THE CASTING

25. STRESSING REMOVE THE SIDE-SHUTTER CRUSH CUBE FOR TESTING THE CONCRETE STRENGTH START STRESSING TO 100% IF CONCRETE IS AT 25 MPA IN LESS THAN 3 DAYS DO PARTIAL STRESSING IF REQUIRED TAKE READINGS AFTER

26. APPROVAL SEND STRESSING RECORDS TO THE P/T CONSULTANT FOR APPROVAL CUT THE TAILS AFTER APPROVAL FILL THE POCKETS PREPARE FOR GROUTING

27. GROUTING SHUTTER CAN BE REMOVED ADEQUATE PROPPING TO BE PLACED GROUTING OPERATIONS CAN START AT ANY TIME