WORK SCOPE
WHAT IS PRESTRESSED?
Prestressing is the application of a force to a structure, in addition to the applied load, to enhance its performance. This technique is widely used in construction, spanning applications such as buildings, underground structures, towers, water storage facilities, offshore structures, and various bridge types, including cable-stayed and segmental bridges, as well as nuclear reactor vessels.
PRIMARY METHODS OF PRESTRESSING
Pre-tensioning: Steel tendons are stressed before the concrete is place at precast plan remote from construction site.
Post-tensioning: Steel tendons are stressed after the concrete is placed and have gained sufficient strength at the construction site.
POST-TENSIONING SYSTEM
Unbonded Post Tensioning System : Single Strand
Bonded Post Tensioning System : Single Strand, Multi-Strand Flat Duct, Multi-Strand Round Duct
Bonded Vs. Unbonded : Develop higher ultimate Flexural Strength and do not depend on anchorage after grouting.
BONDED POST-TENSIONING (BUILDINGS STRUCTURE)
Advantages of using Post-tensioning Design Vs. Typical Conventional Design.
- Faster Floor Construction Cycle (Usually completed in 4-7 days per floor)
- Reduced Floor Weight
- Minimized Reinforcement and Formwork
- Increased Span Between Columns
- Improved Deflection Control
In summary, post-tensioning enhances construction efficiency and structural performance, offering cost savings, quicker timelines, and greater flexibility.
Application of PT on Buildings
Banded Beam & Slab
One-Way Slab & Beam
Two Way - Flat Slab
