![]() 1.2 Need for Prestressed Concrete1 1.3 Brief History of Prestressed Concrete2 1.4 Structural Behaviour of Prestressed Concrete Member3 1.5 Methods of Prestressing6 1.5.1 Pre. ![]() Transfer of Prestress in pre tensioned members- Transmission length- Bond stresses- end zone reinforcement- Codal provisions- Anchorage zone Stresses in Post tensioned members- Stress distribution in end block- Anchorage Zone reinforcement. Cross Section Area for Strength to Ultimate Limit State is given by A F Where F Axial load carried, and compression stress. ![]() Losses of Pre-stressing- Loss of Pre-stress in pre-tensioned and post tensioned members due to various causes -Elastic shortening of concrete, shrinkage of concrete, creep of concrete, Relaxation stress in steel, slip in anchorage, differential shrinkage- bending of members and frictional losses- Total losses allowed for designĭesign for Flexural resistance- Types of flexural failure – Code proceduresDesign of sections for flexure- Control of deflections- Factors influencing DeflectionPrediction of short term and long term deflections.ĭesign for Shear and Torsion- Shear and Principal Stresses- Design of Shear reinforcements- Codal Provisions- Design for Torsion, Design for Combined bending, shear and torsion. Prestressing Systems- Introduction, Tensioning devices, Pre-tensioning Systems, Post tensioning Systems, Basic Assumptions in Analysis of prestress and design, Analysis of prestress, Resultant Stresses at a section- pressure line- Concepts of load balancing- Stresses in Tendons, Cracking moment. ![]()
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