Syllabus

Module I: Basics of Prestressing (8 hours)

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 diameter, 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: Losses of Prestress (7 hours)

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, Deflections, Magnel’s Approach (13 hours)

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

Magnel’s Approach: Stresses in steel in prestressed concrete, service load design basics Stress range approach for flexure design and Magnel's approach

Module IV: Shear, Bond, Anchorage (4 hours)

Shear stress in prestressed beams: Basics, examples Shear stress resistance, modes of failure Design for shear in uncracked and cracked section Design for torsion

Bond: 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 (4 hours)

Statically indeterminate analysis in continuous prestressed beams: Primary moment, secondary moment, moment distribution method, C-line, Linear transformation, concordant cable

Students will attain a solid mastery of the fundamental principles of prestressing.

Students will cultivate a high level of proficiency in the analysis and design of prestressed concrete elements.

Students will acquire a comprehensive understanding of the essential code provisions important for the design of prestressed members.

Students will proficiently apply advanced statically indeterminate analysis techniques to the design of prestressed structures.

Students will demonstrate a thorough understanding of the fundamentals of prestressed concrete design.

Students will accurately determine prestress losses

Students will analyze and design girders for flexure, shear, and torsion, ensuring a comprehensive understanding of the applicable codal provisions.

Students will accurately calculate deflections as part of their design evaluations.

Students will effectively perform statically indeterminate analyses of prestressed members.

N. Rajagopalan, Prestressed concrete, Narosa

N. Krishnaraju, Prestressed concrete, Tata McGraw-Hill

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

not applicable