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Title: Pre-stressed Concrete Structures
Department: Civil Engineering
Author: Prof. Devdas Menon , Prof. Amlan Kumar Sengupta
University: IIT Madras
Type: video
Abstract: Module 1: Introduction, Prestressing Systems and Material Properties (7 Hours)
Topic

Hours
Basic Concept
Early Attempts of Prestressing
Brief History
Development of Building Materials

1
Definitions
Advantages of Prestressing
Limitations of Prestressing
Types of Prestressing
? Source of prestressing force
? External or internal prestressing
? Pre-tensioning or post-tensioning
? Linear or circular prestressing
? Full, limited or partial prestressing
? Uniaxial, biaxial or multiaxial prestressing

1
Prestressing Systems and Devices
Pre-tensioning
? Introduction
? Stages
Advantages
Disadvantages
Devices
? Jacks
? Anchoring devices
? Harping devices

1
Post-tensioning
? Introduction
? Stages
Advantages
Disadvantages
Devices
? Anchoring devices
? Sequence of anchoring
? Jacks
? Couplers
? Grouting

1
Constituents of Concrete
? Introduction
? Aggregate
? Cement
? Water
? Admixtures
Hardened Concrete
? Strength of concrete
? Stiffness of concrete
? Durability of concrete
? High performance concrete
? Allowable stresses in concrete

1
Hardened Concrete
? Stress-strain curves for concrete
? Creep of concrete
? Shrinkage of concrete
Properties of Grout
Codal Provisions

1
Prestressing Steel
? Introduction
? Forms of prestressing steel
? Types of prestressing steel
? Properties of prestressing steel
? Stress-strain curves for prestressing steel
? Relaxation of steel
? Durability
? Fatigue
Codal Provisions

1

Module 2: Losses in Prestress (3 Hours)
Topic

Hours
Notations
? Geometric properties
? Load variables
Losses in Prestress
? Elastic shortening
? Pre-tensioned axial members
? Pre-tensioned bending members
? Post-tensioned axial members
? Post-tensioned bending members

1
Losses in Prestress (Part I)
? Friction
? Anchorage slip
Force Variation Diagram

1
Losses in Prestress (Part II)
? Creep of concrete
? Shrinkage of concrete
? Relaxation of steel
Total Time-dependent Loss

1

Module 3: Analysis of Members (6 Hours)
Topic

Hours
Analysis of Members Under Axial Load
? Introduction
? Analysis at transfer
? Analysis at services loads
? Analysis of ultimate strength
? Analysis of behavior

1
Analysis of Member Under Flexure (Part I)
? Introduction
Analysis at Service Loads
? Based on stress concept
? Based on force concept
? Based on load balancing concept

1
Analysis of Member Under Flexure (Part II)
? Cracking moment
? Kern point
? Pressure line

1
Analysis of Member Under Flexure (Part III)
Analysis for Ultimate Strength
? Variation of stress in steel
? Condition at ultimate limit state
Analysis of Rectangular Sections

1
Analysis of Flanged Sections
1
Analysis of Partially Prestressed Sections
Analysis of Un-bonded Post-tensioned Beams
Analysis of Behaviour

1

Module 4: Design of Members (6 Hours)
Topic

Hours
Design of Members
? Calculation of demand
Design of members for Axial Tension
? Design of prestressing force
? Analysis of ultimate strength
Design of Member for Flexure
? Calculation of moment demand.
? Preliminary design

1
Design of Sections for Flexure (Part I)
? Final design
? Final design for type 1 members
? Special case

1
Design of Sections for Flexure (Part II)
? Final design of type 2 members

1
Design of Sections for Flexure (Part III)
? Choice of sections
? Determination of limiting zone
? Post-tensioning in stages

1
Design of sections for Flexure (Part IV)
? Magnel?s graphical method

1
Detailing Requirements for Flexure
Detailing Requirements for Shear
Detailing Requirements for Torsion

1

Module 5: Analysis and Design for Shear and Torsion (6 Hours)
Topic

Hours
Analysis for Shear
? Introduction
? Stress in an uncracked beam
? Types of cracks
? Components of shear resistance
? Modes of failure
? Effect of prestressing force

1
Design for Shear (Part I)
? Limit state of collapse for shear
? Maximum permissible shear stress
? Design of transverse reinforcement
? Detailing requirement for shear

1
Design for Shear (Part II)
? General comments
? Design steps
? Design of stirrups for flange

1
Analysis for Torsion
? Introduction
? Stresses in an uncracked beam
? Crack pattern under pure torsion
? Components of resistance for pure torsion
? Modes of failure
? Effect of prestressing force

1
Design for Torsion (Part I)
? Limit state of collapse for torsion
? Design of longitudinal reinforcement
? Design of transverse reinforcement

1
Design for Torsion (Part II)
? Detailing requirements
? General comments
? Design steps

1

Module 6: Calculations of Deflection and Crack Width (1 Hour)
Topic

Hours
Calculation of Deflection
? Deflection due to gravity loads
? Deflection due to prestressing force
? Total deflection
? Limits of deflection
? Determination moment of inertia
? Limits of span-to-effective depth ratio
Calculation of Crack Width
? Method of calculation
? Limits of crack width

1

Module 7: Transmission of Prestress (2 Hours)
Topic

Hours
Transmission of Prestress (Part I)
? Introduction
? Pre-tensioned members
Transmission length
Development length
End zone reinforcement

1
Transmission of Prestress (Part II)
? Post-tensioned members
End zone reinforcement
Bearing plate

1

Module 8: Cantilever and Continuous Beams (3 Hours)
Topic

Hours
Cantilever Beams
? Introduction
? Analysis
? Determination of limiting zone
? Cable profile

1
Continuous Beams (Part I)
? Introduction
? Analysis
? Incorporation of moment due to reactions
? Pressure line due to prestressing force

1
Continuous Beams (Part II)
? Concordant cable profile
? Cable profiles
? Partially continuous beams
? Analysis at ultimate limit state
? Moment redistribution

1

Module 9: Special Topics (6 Hours)
Topic

Hours
Composite Sections
? Introduction
? Analysis of composite sections
? Design of composite sections
? Analysis for horizontal shear transfer

1
One-way Slabs
? Introduction
? Analysis and design

1
Two-way Slabs (Part I)
? Introduction
? Analysis
? Features in modeling and analysis
? Distribution of moments to strips

1
Two-way Slabs (Part II)
? Checking for shear capacity
? Spandrel beams
? Anchorage devices
? Additional aspects

1
Compression Members
? Introduction
? Analysis
? Development of interaction diagram
? Effect of prestressing force

1
Circular Prestressing
? Introduction
? General analysis and design
? Prestressed concrete pipes
? Liquid storage tanks
? Ring beams
Conclusion
 
   
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