Post-Tensioning Systems
Post-tensioning is a means of strengthening or reinforcing concrete by introducing stress to the element using high strength steel bars or strands. A compressive force is applied to the concrete member, which strengthens the slab and can allow it to remain in compression when it flexes under applied loads. This method of construction provides many benefits over traditionally reinforced concrete. In buildings it can provide thinner slabs resulting in lower building heights and consequently a reduction in the amount of concrete required, thereby offering both cost and environmental benefits. Longer spans can be achieved which increase layout flexibility and offer cost-savings in terms of service location and maximisation of valuable floor space. In the design of bridges, post-tensioning can allow the creation of longer, more slender spans with fewer supports thereby facilitating the design of more elegant and aesthetic structures. Post-tensioned concrete can also minimise problems of cracking and settlement, to improve structural durability and longevity.
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