Title: External Prestressing: A State of the Art
Author(s): A. S. G. Bruggeling
Publication: Symposium Paper
Appears on pages(s): 61-82
Keywords: anchorage (structural); box beams; bridges (structures); cable-supported structures; history; prestressed concrete; prestressing; prestressing steels; reviews; segmental construction; serviceability; supports; unbonded prestressing; Design
In the last decade, the use of external tendons for prestressing of concrete structures has been developed considerably for a variety of applications. This paper deals with the technical problems related to the use of external prestressing to emphasize the development and investigation of critical questions. The following aspects are discussed: behavior of concrete structures at he serviceability and ultimate limit states; the required minimum area of conventional (nonprestressed) reinforcement; general protection of the tendons; corrosion protection of the prestressing steel; design of the saddles--deviation zones--and the effect of tendon curvature on their strength and transfer of the prestress forces to the structure; and anchorage of the tendons and the zone of transfer of the prestressing force into the structure.