Upon successful completion of this course, students will be able to
1. Characterize the materials to be used and identify the basic principles of Pre-stressed Concrete and Analyze the PSC sections for flexure.
2. Calculate loss of prestress and estimate the deflections of PSC Members.
3. Design PSC beams using concept of limit state.
Introduction Basic concepts of Prestressing, Historical Development, Need for High Strength steel and Concrete, Terminology. Material for Prestressed Concrete High-Strength Concrete, High Tensile Steel.
Self-Learning Exercise: Advantages of Prestressed Concrete, Applications of Prestressed Concrete.
Prestressing systems Introduction, Tensioning Devices, Pretensioning Systems, Post-Tensioning Systems. Analysis of Prestress and Bending Stresses Basic Assumptions, Analysis of prestress, Resultant Stresses at a section, Pressure line or thrust line and internal resisting couple, concept of load balancing, stress in tendons, cracking moment.
Self-Learning Exercise: Thermo-Electric Prestressing, Chemical Prestressing. Unit-III Losses of Prestress Nature of losses of prestress, loss due to elastic deformation of concrete, loss due to shrinkage of concrete, loss due to creep of concrete, loss due to relaxation of stress in steel, loss of stress due to friction, loss due to anchorage slip
Self-Learning Exercise: Total losses allowed for in design.
Unit-IV Deflections of Prestressed concrete Members Importance of control of Deflections, Factors Influencing deflections, Short-term deflections of uncracked members, Prediction of long time deflections, deflections of cracked members, Requirements of various codes of practice.
Self-Learning Exercise: Load verses deflection curve, methods of reducing deflection.Unit-V Limit State Design Criteria for Prestressed concrete Members Introduction, Inadequacies of the Elastic and ultimate Load methods, Philosophy of Limit-State design, Criteria for Limit States, Design loads and strengths, Strength and serviceability limit states, crack widths in prestressed members.
Self-Learning Exercise: Principles of dimensioning prestressed concrete members Unit-VI Design of prestressed concrete sections Design of sections for flexure, design of sections for axial tension, design of sections for compression and bending, design of prestressed sections for shear and torsion.
Self-Learning Exercise: Design of prestressed members for bond, design of prestressed members for bearing
1. N. Krishna Raju, “Pre-stressed Concrete”, Tata mc. Graw Hill Publishers.-4 th edition.- 2015
1. T.Y. Lin and Ned H. Burns, “Design of pre-stressed concrete structures”, John Wiley & Sons, NewYork.–3 rd edition, 1981.
2. N.C. Sinha and S.K. Roy, “Fundamental of pre-stressed concrete”, S.Chand, 1994.
3. IS -1343:2012, Prestressed Concrete – code of practice.
4. N. Rajgopalan, “Pre-stressed Concrete”, Narosa Publishing House, 2008. 5. P. Dayarathnam, “Pre-stressed Concrete”, Oxford and IBH Publishing.
- Teacher: HEMA H