This type of slab construction is the most common and most favored owing to their fast and economic construction cycles, flexibility for architects and partition placement, service distribution and minimal form work requirements.
The heart of our practice
We have built a legacy synonymous with elegance, simplicity and efficiency in design and build of Post-Tensioned concrete Structures.
Since 1993 we have delivered some of the most iconic Post-Tensioned concrete structures across the world from our hereditary legacy in Australia, to Europe and the Middle East’s most iconic skylines.
In traditional Reinforced Concrete, when loads are applied onto an element they induce two types of stress regions known as compressive and tensile. As concrete is strong in compression but weak in tension, steel reinforcement is introduced in the tensile region to resist the tensile stresses as seen on the left; as a result, the concrete capacity in the tensile region is not being utilised.
It consists of threading high tensile strength steel strands collectively known as a tendon, which are threaded across a concrete element and anchored against its edges.
The anchored tendons are then tensioned post the casting of the concrete, hence the term Post-Tensioned concrete.
Following newton’s third law, the reaction from the applied tensile forces in the tendons, as seen on the left, induces an equal but opposite compressive reaction on the concrete section.
These reaction compressive forces result in the entire section being in compression and therefore the maximum utilisation of the concrete’s ompressive capacity.
Hospitals
Office Buildings
Residential Buildings
Skyscrapers
Schools
Industrial Buildings
Car Parks
Foundation Slabs
Basements
Bridges
Containment Structures
NTPS’ industry standard product development offers proprietary product systems that hold mechanical specification properties that are at the forefront of the industry.
We offer two main Post-Tensioning systems namely the FPS and the MPS ranges as outlined in the following sections. All our anchorage systems are tested to AS1314 industry standard.
The FPS Range is our proprietary flat Post-Tensioning anchorages which have been developed in Australia adhering to Australian Standard AS1314 and are primarily employed in concrete slab applications, transfer building structures, transversal installation in bridge decks and other civil applications such as containment structures.
| FPS Range | Strand Range | A | B | C | D | F | G | H |
|---|---|---|---|---|---|---|---|---|
| FPS-13-3 | 13 | 197 | 153 | 70 | 800 | 250 | 75 | 600 |
| FPS-13-5 | 13 | 235 | 210 | 75 | 800 | 250 | 75 | 600 |
| FPS-15-3 | 15 | 203 | 203 | 86 | 800 | 250 | 75 | 600 |
| FPS-15-5 | 15 | 270 | 260 | 95 | 800 | 250 | 75 | 600 |
The MPS Range is our proprietary Multi-Strand Post-Tensioning anchorage systems which have been developed in Australia adhering to Australian Standard AS1314 and are primarily employed in Civil and Structural applications such as transfer structural elements, concrete bridge applications, containment structures and marine construction applications.
The MPS Range accommodates the ‘15’ strand ranges and are the anchorage system which transfer the pre-stressing loads to the encapsulating concrete element.
| FPS Range | A | B | C | D | E | F | G | H | I | J |
|---|---|---|---|---|---|---|---|---|---|---|
| MPS-15-9 | 155 | 55 | 195 | 200 | 170 | 75 | 16 | 235 | 50 | 5 |
| MPS-15-13 | 165 | 65 | 225 | 240 | 190 | 95 | 16 | 265 | 60 | 5 |
| MPS-15-19 | 205 | 75 | 275 | 335 | 235 | 100 | 20 | 315 | 60 | 6 |
| MPS-15-27 | 245 | 85 | 335 | 430 | 285 | 120 | 20 | 360 | 60 | 7 |
| MPS-15-31 | 265 | 90 | 355 | 470 | 295 | 130 | 25 | 400 | 60 | 8 |
| MPS-15-37 | 295 | 100 | 395 | 520 | 325 | 140 | 25 | 475 | 60 | 8 |
This section offers a very straightforward method to attain quick sizing of PT slab option thicknesses.
This type of slab construction is the most common and most favored owing to their fast and economic construction cycles, flexibility for architects and partition placement, service distribution and minimal form work requirements.
Another common and highly adopted form of slab construction are flat slabs with drop panels. Owing the same advantages that typical flat slabs offer, drop panels offer a much higher shear capacity allowing for much higher loads to be accommodated for roughly the same slab depth. The main trade off however is the reduced floor to floor height.
These types of slabs are common for large spans over 10m with high design loads. They allow for relatively reduced slab depths but the trade off is that the floor height is subject to the band beam depth. So while the overall slab depth is lower than the flat slab counterpart, the floor to floor height will typically be governed by the beam depth.
