Post Tensioning in Building Structures-Project Report

Post Tensioning in Building Structures-Project Report

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Advantages of Post Tensioned Floors

Here are some primary advantages of post-tensioned floors over conventional reinforced concrete in-situ(cast in site) floors may be following:

Longer Spans

Longer spans can be used reducing the number of columns. This results in larger, column-free floor areas which greatly increase the flexibility of use for the structure and can result in higher rental returns.

Overall Structural Cost

The total cost of materials, labour and formwork required to construct a floor is reduced for spans greater than 7 meters, thereby providing superior economy.

Reduced Floor to Floor Height

For the same imposed load, thinner slabs can be used. The reduced section depths allow minimum building height with resultant savings in facade costs. Alternatively, for taller buildings, it can allow more floors to be constructed within the original building envelope.

Deflection Free Slabs

Undesirable deflections under service loads can be virtually eliminated.

Waterproof Slabs

Post-tensioned slabs can be designed to be crack free and therefore waterproof slabs are possible. Achievement of this objective depends upon careful design, detailing and construction. The choice of concrete mix and curing methods along with quality workmanship also plays a key role.

Early Formwork Stripping

The earlier stripping of formwork and reduced back propping requirements enable faster construction cycles and quick re-use of formwork. This increase in speed of construction is explained further in the next section on economics.

Materials Handling

The reduced material quantities in concrete and reinforcement greatly benefit on-site carnage requirements. The strength of the post-tensioning strand is approximately 4 times that of conventional reinforcement. Therefore the total weight of reinforcing material is
greatly reduced.

Column and Footing Design

• The reduced floor dead loads may be utilized in a more economical design of the reinforced concrete columns and footings. In multi-storey buildings, reduced column sizes may increase the floor net lettable area.
• These advantages can result in significant savings in overall costs.
• There are also some situations where the height of the building is limited, in which the reduced storey height has allowed additional storey’s to be constructed within the building envelope.

Contents of Post Tensioning in Building Structures-Project Report

Here is the short overview of contents which are mentioned in the attached pdf file.

1. Introduction
2. Advantages of post-tensioned floors
3. Bonded or unbonded Tendon systems
4. Bonded tendon system
5. Unbonded tendon system
6. Materials and Workmanship
7. Formwork
8. Cement
9. Aggregates
10. Water
11. Admixtures
12. Prestressing Steel
13. Untensioned Steel
14. Storage of materials
15. Strands
16. Concrete
17. Workability of concrete
18. Durability of concrete
19. Concrete Mix Proportions
20. Production and control of concrete
21. Equipment
22. Assembly of prestressing & reinforcing steel
23. Prestressing steel
24. Arrangements of wires and positioning
25. Protection of Prestressing steel and anchorages
26. Internal prestressing steel
27. External prestressing steel
28. Reinforcing steel
29. Design of RCC beam
30. Design of PT beam
31. Quantity calculations
32. Economics
33. When is Post-tensioning Cost Effective
34. Factors affecting cost of Post-tensioning
35. Treatment of construction joints
36. Economical Design
37. Partial Prestressing
38. Detailing
39. Structural Systems
40. Construction Details
41. Stressing procedure
42. Future flexibility & penetrations
43. Designing Post-Tensioned slabs for future openings
44. Locating Post-tensioning tendons
45. Demolition of Post-tensioned structures
46. Summary
47. Conclusion
48. References

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