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Course 29. Pre-stressed Concrete Structures (Video Course)

Faculty Coordinator(s) :

1. Prof. Devdas Menon

  Department of Civil Engineering

Indian Institute of Technology Madras

Chennai – 600036

Email : dmenon@iitm.ernet.in

  Telephone : (91-44)  Off : 2257 8303 

Res : 2445 9303

2. Prof. Amalan Kumar Sengupta

  Department of Civil Engineering

Indian Institute of Technology Madras

Chennai – 600036

Email : amlan@civil.iitm.ernet.in

  Telephone : (91-44)  Off :  2257 8292 

Res : 2257 9292

Detailed Syllabus :

Module 1: Prestressing Systems and Material Properties (4 hours)

Topics Hours

Brief history;Types of prestressing: pretensioning and post-tensioning, linear and circularprestressing, external and internal prestressing, full and partial prestressing,uniaxial and biaxial prestressing.

1

Advantages and disadvantages of prestressing, advantages of precast members;prestressing systems: definitions of common terms in prestressing; pretensioningdevices, post-tensioning devices, anchorage devices, transfer of prestress, grouting.

1

Material properties: aggregates, cement, concrete, allowable stresses, creep,shrinkage.

1

Material properties: steel, allowable stresses, relaxation, fatigue. 1

Module 2: Losses in Prestress (3 hours)

Topics Hours

Immediate losses: elastic shortening. 1

Friction and anchorage slip, Force flow diagram. 1

Time dependent losses: creep, shrinkage, relaxation;

IS Code provisions, PCI step -by-step procedure.

1

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Module 3: Analysis of Members (6 hours)

Module 4: Design of Members for Flexure (7 hours)

Topics Hours

Design based on service loads: preliminary design.  1

Final design for Type I member (no tensile stress).  1

Final design for Type II (limited tensile stress) and TYPE III (limited cracking)members.

1

Choice of cross section: flexural efficiency;Determination of limiting zone; Post-tension in stress.

1

Magnel’s graphical method. 1

Design based on ultimate loads. 1

Detailing requirement. 1

Module 5: Analysis and Design for shear and torsion (7 hours)

Topics Hours

Analysis for shear: principal stress trajectories of linear elastic beams, crackPatters, modes of failure, component of shear resistance.

1

Capacity for web shear cracking capacity for flexural shear cracking. 1Design of shear reinforcement detailing requirements, design steps. 1

Analysis for torsion behavior of linear elastic beams, crack pattern.

Modes of failure, components of torsion resistance. 1

Design of torsion reinforcement. 1

Detailing requirements, design steps. 1

Module 6: Calculations for deflection and crack-width (2 hours)

Topics Hours

Calculations for deflection 1

Calculations for crack-width of Type III members. 1

Module 7: Design for Transfer of Prestress (2 hours)

Topics Hours

Pretensioned members: Hoyer effect, transmission length, bond length, developmentlength, transverse tensile stresses, end zone reinforcement.

1

Post-tensioned members: Bursting force, anchorage zone reinforcement, bearing

stress, design of end block.

1

Module 8: Cantilever beams and Continuous beams (3 hours)

Topics Hours

Cantilever beams: choice of cable profile, determination of limiting zone. 1

Continuous beams: advantages and disadvantages, choice of cable profile, analysis forbending moment.

1

Principle of linear transformation, principle of concordant cable, determination 1 of 1

Topics Hours

Analysis of members under axial load. 1

Analysis of members under flexure at service loads: stress concept, force concept,load balancing concept.

1

Cracking moment, kern point, pressure line, concept of limiting zone. 1Analysis of rectangular sections under flexure at ultimate loads: equations ofequilibrium and compatibility and constitutive models, stress block for concrete,solution procedure, minimum and maximum amount of prestressed reinforcement.

Analysis of flanged sections under flexure at ultimate loads. 1

Analysis of partially prestressed sections under flexure at ultimate loads. 1

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limiting zone.

Module 9: Special Topics (4 hours)

Topics Hours

Composite construction: analysis and design 1

Analysis and design of slabs 1Analysis and design of members under flexure and axial compression 1

Circular prestressing: application, analysis and design 1