> Post Tensioning

Post-tensioned concrete has proven to be a preferred method of construction for commercial and office buildings, residential apartments, high-rise condominiums, parking structures, and mixed-use facilities such as hotels. Developers and owners who select post-tensioning benefit from longer, thinner slabs, which results in greater design flexibility as the number of columns is reduced. Further, post-tensioning requires less reinforcing steel to achieve the same strength as well as smaller shear walls and column sizes. This results in more durable, lighter structures with long, clear spans.

The benefits don’t stop there. High early-strength concrete allows for faster floor construction cycles and the use of standard design details for post-tensioned elements, minimum congestion of prestressed and non-prestressed reinforcement, and earlier stripping of formwork after tendon stressing can also significantly reduce the floor construction cycle. Greater span-to-depth ratios are allowed for post-tensioned members as compared to non-prestressed members. This results in a lighter structure and a reduction in floor-to-floor height while maintaining the required headroom.

Post-tensioning also provides superior performance of diaphragm action at building irregularities, resisting tensile forces resulting from separation of “wings” at re-entrant building corners. Further, post-tensioned slabs span farther than non-prestressed slabs, allowing for wider column spacing and fewer columns. Cast-in-place post-tensioned concrete also greatly reduces the floor-to-floor height when compared to a structural steel option.

Post-tensioning offers the following benefits:

  • Significant reduction in the amount of concrete and reinforcing steel required.
  • Thinner structural members as compared to non-prestressed concrete, resulting in lower overall building heights and reduced foundation loads.
  • Aesthetically pleasing structures that harness the benefits of cast-in-place structures with curved geometries, and longer, slender members with large spaces between supports.
  • Superior structural integrity as compared to precast concrete construction because of continuous framing and tendon continuity.
  • Monolithic connections between slabs, beams, and columns that can eliminate troublesome joints between elements.
  • Profiled tendons that result in balanced gravity loads (typically a portion of dead load only), significantly reducing total deflection.
  • Better crack control, which results from permanent compressive forces applied to the structure during prestressing.
  • Reduction in overall building mass.
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