Post-tensioning enables concrete structures that combine efficient material use, long spans and structural performance. When properly designed, post-tensioned concrete structures can be slimmer than conventional reinforced concrete structures, allowing more open layouts.
Anfra assesses the potential of post-tensioned concrete as part of structural design and construction. Our aim is to identify a solution that meets the project's technical requirements and supports cost-effective construction.
Post-tensioning can enable longer spans and reduce the need for intermediate supports. This gives designers greater flexibility in space planning. For example, in parking facilities, the position of columns directly affects how efficiently the space can be used.
Compared with an equivalent conventionally reinforced concrete solution, post-tensioning can allow thinner slabs and slimmer structural members. Reducing the structure's self-weight can also reduce loads on the foundations. Potential material savings are always assessed through project-specific structural design.
Post-tensioning introduces compressive stress into the concrete, helping it resist tensile stresses under service loads. This can reduce cracking and improve watertightness. These benefits are useful in parking structures and other applications where crack control is important.
The benefits of post-tensioned concrete extend beyond the quantities of concrete and steel. A reduced structural depth can also affect foundation requirements, overall building height and the construction process. Longer spans can reduce the number of columns and increase usable space.
The cost-effectiveness of the solution is assessed by comparing structural alternatives and their impact on total project costs.
Post-tensioning is particularly relevant to projects that require long spans, high load-bearing capacity or efficient structural design.
long spans, fewer columns and efficient use of space.
reduced structural depths and efficient structural design.
applications where loading, geometry or material efficiency make post-tensioning worth considering.
compressive stress can help control cracking in suitable water- and liquid-tight concrete structures.
post-tensioned structures can accommodate heavy loads and long spans.
Post-tensioning is not suitable for every project. Its suitability and economic benefits depend on factors such as spans, loads, the structural system and construction constraints.
Post-tensioning uses high-strength steel strands installed in the concrete and tensioned once it has reached the required strength. The strands introduce compressive stress into the concrete, improving its behaviour under load.
In bonded systems, the strands are installed in ducts, which are filled with cementitious grout after stressing. Unbonded systems use greased steel strands enclosed in protective sheathing. The prestressing force is transferred to the concrete through anchorages.
The method allows a different approach to structural design from conventional reinforced concrete. Its potential benefits should therefore be assessed early in the structural design process.
Successful post-tensioned structures require coordination between structural design, the post-tensioning system and site construction. The design and delivery process must account for loads, structural calculations, the post-tensioning system, anchorages and quality assurance during construction.
Anfra assesses the suitability of post-tensioned concrete as part of the project's structural design. Where required, specialist design and stressing operations are carried out in collaboration with partners specialising in post-tensioning.
Our aim is to identify, at the design and tender stages, where post-tensioned concrete may offer a better alternative to conventional reinforced concrete.
Could post-tensioning enable longer spans, slimmer structures or more efficient material use in your project?
Anfra helps you explore alternative structural solutions and assess their technical and economic potential.
Contact us to find the most suitable solution for your project.