Prestressed structure is a construction material which is placed under compression prior to it supporting any applied loads (i.e. it is "pre" stressed).This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete or steel volume, and is done to improve the performance of the structure in service. Tendons may consist of single wires, multi-wire strands or threaded bars, and are most commonly made from high-tensile steels, carbon fiber or aramid fiber. The essence of prestressed structure is that once the initial compression has been applied, the resulting material has the characteristics of high-strength concrete when subject to any subsequent compression forces, and of ductile high-strength steel when subject to tension forces. This can result in improved structural capacity and serviceability compared to conventionally reinforced concrete in many situations.
- Forces introduced by prestressing
- Load balancing and force profiles
- Prestress levels
- Anchorage forces