Introduction: Historic development- General principles of prestressing pretensioning and
post tensioning- Advantages and limitations of Prestressed concrete- General principles of
PSC- Classification and types of prestressing M aterials- high strength concrete and high
tensile steel their characteristics.Methods and Systems of prestressing: Pretensioning and
Posttensioning methods and systems of prestressing like Hoyer system, Magnel Blaton
system, Freyssinet system and Gifford- Udall System- Lee McCall system.
Losses of Prestress: Loss of prestress in pretensioned and post-tesnioned members due to
various causes like elastic shortage of concrete, shrinkage of concrete, creep of concrete,
relaxation of stress in steel, slip in anchorage, frictional losses.
Flexure: Analysis of sections for flexure- beams prestressed with straight, concentric,
eccentric, bent and parabolic tendons- stress diagrams- Elastic design of PSC beams of
rectangular and I sections- Kern line — Cable profile and cable layout.
Shear: General Considerations- Principal tension and compression- Improving shear
resistance of concrete by horizontal and vertical prestressing and by using inclined or
parabolic cables- Analysis of rectangular and I beams for shear — Design of shear
reinforcements- Bureau of Indian Standards (BIS) Code provisions.
Transfer of Prestress in Pretensioned Members : Transmission of prestressing force by
bond — Transmission length — Flexural bond stresses — IS code provisions — Anchorage
zone stresses in post tensioned members — stress distribution in End block —Analysis by
Guyon, Magnel, Zielinski and Rowe’s methods — Anchorage zone reinforcement- BIS
Composite Beams: Different Types- Propped and Unpropped- stress distributionDifferential shrinkage- Analysis of composite beams- General design considerations.
Deflections: Importance of control of deflections- Factors influencing deflections — Short
term deflections of uncracked beams- prediction of long. time deflections- BIS code