Unit 1 INTRODUCTION - THEORY AND BEHAVIOUR

9 lecture hours

• Basic concepts
• Materials required etc.
• Systems and methods of prestressing
• Analysis of sections
• Stress concept
• Strength concept
• Load balancing concept
• Effect of loading on the tensile stresses in tendons
• Effect of tendon profile on deflections
• Factors influencing deflections
• Calculation of deflections
• Short term and long term deflections
• Losses of prestress
• Estimation of crack width

Unit 2 DESIGN FOR FLEXURE AND SHEAR

9 lecture hours

• Basic assumptions for calculating flexural stresses
• Permissible stresses in steel and concrete as per I.S.1343 Code
• Design of sections of Type I and Type II post-tensioned and pre-tensioned beams
• Check for strength limit based on I.S. 1343 Code
• Layout of cables in post-tensioned beams
• Location of wires in pre-tensioned beams
• Design for shear based on I.S. 1343 Code

Unit 3 DEFLECTION AND DESIGN OF ANCHORAGE ZONE

• Factors influencing deflections
• Short term deflections of uncracked members
• Prediction of long term deflections due to creep and shrinkage
• Check for serviceability limit state of deflection. 8 20% Determination of anchorage zone stresses in post-tensioned beams by Magnel’s method
• Guyon’s method and IS1343 code
• design of anchorage zone reinforcement
• Check for transfer bond length in pre-tensioned beams

Unit 4 COMPOSITE BEAMS AND CONTINUOUS BEAMS

7 lecture hours

• Analysis and design of composite beams
• Methods of achieving continuity in continuous beams
• Analysis for secondary moments
• Concordant cable and linear transformation
• Calculation of Stresses
• Principles of design

Unit 5 MISCELLANEOUS STRUCTURES

• Design of tension and compression members – Tanks
• pipes and poles
• Partial prestressing: Definition
• methods of achieving partial prestressing
• merits and demerits of partial prestressing. 7 15%