- Title: Pre-stressed Concrete Structures
- Department: Civil Engineering
- Author: Prof. Devdas Menon , Prof. Amlan Kumar Sengupta
- University: IIT Madras
- Type: WebLink
- 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)
Magnels 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