Course Details
Subject {L-T-P / C} : CE6234 : Pre-Stressed Concrete { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Mahendra Gattu
Syllabus
Module-I:
Introduction, Prestressing systems: Pre-tensioning, Post-Tensioning, Anchorage systems, Chemical Prestressing, Electro-thermal prestressing, Wire,Bar, strand, tendon, IS code provisions for tensile strength vs diamater, cold drawing of steel,
Concenctric tendon: Relation between prestressing force during jacking and prestressing force after concrete has set, hydrogen embrittlement, clear cover provisions, IS code provisions for limits on prestressing tensile force in bars
Analysis of flexure: Force transfer for eccentric sections, Concept of pressure line, Load balancing concept
Module-II:
Loss of Prestress: Elastic deformation of concrete, Friction, wobbling effect, Anchorage slip, creep in concrete, Creep of concrete, stress relaxation, concrete shrinkage
Module-III:
Analysis of flexure: Basic concepts, Simplified codal procedure for analysis of flexure,British Code and American Codes for analysis of flexure
Deflection of uncracked members: Short Term and Long Term
Deflection of cracked members: Short Term, Limits on deflection in Code, British Code BS EN 1992-1-1
Stresses in steel in prestressed concrete, service load design basics
Stress range approach for flexure design and Magnel's approach
Module-IV
Shear stress in prestressed beams basics, examples
Shear stress resistance, modes of failure
Design for shear in uncracked and cracked section
Design for torsion,
Transmission Length, Bond stress, Transverse tensile stress, End zone reinforcement, Flexural bond stress,
Anchorage stresses in end zone: Using Magnel's method and Guoyon's method, IS codal provisions.
Module-V:
Statically indeterminate analysis in continuous prestressed beams: Primary moment, secondary moment, moment distribution method, C-line,
Statically indeterminate analysis in continuous prestressed beams: Linear transformation, concordant cable
Course Objectives
- Understanding of fundamentals of prestressing
- Analysis and design of prestressed concrete members
- Knowledge of the design codal provisions for prestressed members
- Statically indeterminate analysis of prestressed members
Course Outcomes
CO1: Students will be able to understand the PSC design fundamentals. <br />CO2: Students will be able to analyze and design girders for flexure, shear & torsion, and understand design codal provisions. <br />CO3: Students will be able to find the deflections and losses in prestress. <br />CO4: Students will be able to carry out statically indeterminate analysis of prestressed members <br />CO5: Students will be to use prestressed concrete as a design solution in real life scenarios.
Essential Reading
- N. Rajagopalan, Prestressed concrete, Narosa
- N. Krishnaraju, Prestressed concrete, Tata McGraw-Hill
Supplementary Reading
- T. Y. Lin and N. H. Burns, Design of Prestressed concrete structures, John Willey & Sons
- A.E. Naaman, Prestressed Concrete Analysis and Design – Fundamentals, CBS