Goals of prestressing steel members:
- Enlarge the elastic range of the structure; redistribute the internal stresses or forces; and decrease the deformations.
- Reduce the structural steel weight by the efficient use of high-strength steel.
- Increase the fatigue resistance.
Preflex method of prestressing steel beams:
Prestressing steel beam by welding pretensioned high strength stel flange to T-section:
Prestressing steel beam by welding high-strength cover plate to bottom flange of cambered beam:
