RESTRESSED CONCRETE DESIGN
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
• Pretensioning or posttensioning
• Linear or circular prestressing
• Full, limited or partial prestressing
• Uniaxial, biaxial or multiaxial prestressing

1 
Prestressing Systems and Devices
Pretensioning
• Introduction
• Stages
Advantages
Disadvantages
Devices
• Jacks
• Anchoring devices
• Harping devices

1 
Posttensioning
• 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
• Stressstrain curves for concrete
• Creep of concrete
• Shrinkage of concrete
Properties of Grout
Codal Provisions

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Prestressing Steel
• Introduction
• Forms of prestressing steel
• Types of prestressing steel
• Properties of prestressing steel
• Stressstrain 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
• Pretensioned axial members
• Pretensioned bending members
• Posttensioned axial members
• Posttensioned 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 Timedependent 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 Unbonded Posttensioned 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
• Posttensioning 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 spantoeffective 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
• Pretensioned members
Transmission length
Development length
End zone reinforcement

1 
Transmission of Prestress (Part II)
• Posttensioned 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 
Oneway Slabs
• Introduction
• Analysis and design

1 
Twoway Slabs (Part I)
• Introduction
• Analysis
• Features in modeling and analysis
• Distribution of moments to strips

1 
Twoway 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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