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. 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. General features and junction of tank wall and base slab 2times pg499,503 5.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. Unit-3 1.factors influencing deflection pg 151 2.291-10.1 3times veey imp 3.magnel method 8m pg 290 4.short and long term deflection of cracked member pg163,171 Unit-4 1.types of composite construction very imp 3 times pg 410 2.418-14.4 3.413-14.1 2times 4. Prestressing is used to counteract the tensile stresses in the concrete beam are caused by the weight of members and imposed loads.
Prestressing has a simple theory and has been used for many years in different types of structures. Pg74 14.loss of prestress refer code book Unit-2 1.203-7.7 2.207-7.9 2times 3.201-7.4 4.202-7.5 2times 5. Prestressed concrete is a combination of concrete and steel that takes advantage of the strength of each material.
methods of prestressing 3 times very imp. Prestressed concrete structures university questions
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