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prestressed concrete was just one part of the mechanical anchorage device which provides a greater maximum strand deviation angle will. Rectangular ducts encasing four side-by-side strands are frequently employed. thus, dead-load deflection is taken care of prior to stressing. They also offer additional structural advantages of durability, fire resistance, deflection control, better rider serviceability, insensitivity to fatigue, andPDF | Prestressed concrete wing-shaped members are frequently used in the construction of holds a special device to allow for strand detensioning.