Analysis and Design of Prestressed Concrete Structures

Contents

Preface

About the Author

Notations

1. Introduction

1.1 Comparison between Reinforced Concrete and Prestressed Concrete

1.2 General Concepts of Prestressing

1.3 Classification and Types of Prestressed Concrete Structures

1.4 Stages of Loading

1.5 Historical Development of Prestressing

1.6 Economics of Prestressed Concrete

1.7 Partial Prestressing

1.8 Design Codes

1.9 Terminology

1.10 Demonstrative Prestressed Concrete Structures

2. Materials and Systems for Prestressing

2.1 Introduction

2.2 Strength Requirements of Concrete

2.3 Stress-Strain Characteristics of Concrete

2.4 Lightweight Aggregate Concrete

2.5 Self-Stressing Cement or Expansive Cement

2.6 Prestressing Steels

2.7 Prestressing Systems and Anchorages

3 Loss of Prestress

3.1 Loss due to Elastic Shortening of Concrete

3.2 Time Dependent Losses

3.3 Prestress Loss due to Anchorage Slip

3.4 Prestress Loss due to Friction

3.5 PCI Committee Recommendation for Computing Time-Dependent Losses

3.6 Total Amount of Losses

4 Analysis of Prestressed Concrete Sections for Flexural Loadings

4.1 Introduction and Sign Convention

4.2 Analysis of Prestress in Concrete

4.3 Resultant Stresses in Prestressed Concrete Section due to Loads

4.4 Location of Thrust Line and Internal Resisting Couple

4.5 Load Carrying Mechanism in Prestressed and Reinforced Concrete Beams

4.6 Load Balancing Method

4.7 Variation of Stresses in Tendons due to Loads

4.8 Kern Point Locations and Kern Distances

4.9 Cracking Moment

4.10 Analysis of Composite Sections

4.11 Stresses due to Differential Shrinkage in Composite Structures

5 Flexural Strength of Prestressed Concrete Sections

5.1 Sudden Rupture of Tendons and/or Steels

5.2 Failure Mode of Under-Reinforced Sections

5.3 Failure Mode of Over-Reinforced Sections

5.4 Other Failure Modes
5.5 Methods of Analysis for Flexural Strength

6 Shear and Torsional Strength of Prestressed Concrete Members

6.1 Introduction

6.2 Shear and Principal Stresses in Beams

6.3 Types of Shear Cracks

6.4 Ultimate Shear Strength of Prestressed Concrete Members

6.5 Design of Shear Reinforcements

6.6 Horizontal Shear Strength in Composite Construction

6.7 Torsional Strength and Behavior of Prestressed Concrete Members

6.8 Design of Prestressed Concrete Member for Torsion

6.9 Failure Modes in Beam Subjected to Combined Bending and Twisting Moment

6.10 IS 1343:2012 Design Recommendations for Combined Bending, Shear and Torsion

6.11 Steps for Design for Torsion as per Modified Truss Analogy Method

6.12 Design of Reinforcements for Torsion as per British Code (BS: 8110)

7 Indeterminate Prestressed Concrete Structural Elements

7.1 Introduction

7.2 Disadvantages of Indeterminate Prestressed Concrete Structures

7.3 Layouts of Tendons for Continuous Beams

7.4 Elastic Theory for Analysis of Continuous Prestressed Concrete Elements

7.5 Linear Transformation and Concordance of Tendons

7.6 Procedure to Obtain a Concordant Tendon Profile
7.7 Cable Location with its Limiting Zone
7.8 Ultimate Load Analysis and Behavior of Continuous Prestressed Concrete Beam
7.9 Practical Cable Profile

8 Deflection, Camber, and Crack Control of Prestressed Concrete Members

8.1 Introduction

8.2 Factors affecting Deflections or Camber

8.3 Basic Assumptions in Deflection Calculation

8.4 Short-Term Deflection of Uncracked Members

8.5 Long-Term Deflection of Uncracked Members

8.6 Short-Term Deflection of Cracked Members

8.7 Long-Term Deflection and Camber

8.8 Serviceability Limit States of Deflection

8.9 Crack Width in Prestressed Beams

8.10 Limit State of Serviceability for Cracking (IS 1343:2012)

8.11 Limit State of Serviceability for Deflection

9 Design of Prestressed Concrete Sections

9.1 Introduction

9.2 Minimum Required Section Modulus

9.3 Proper Selection of Beam Sections and Properties

9.4 Trial and Error Approach for Design of Section under Service Load Condition

9.5 Elastic Design of Composite Sections

9.6 Design of Section Based on Ultimate Strength

9.7 Comparison of Ultimate and Elastic Design Approaches
9.8 A Note on Prestressing in Stages and Arrangement of Steel Tendons

10 Design of Transfer and Anchorage Zones

10.1 Introduction

10.2 Transfer of Prestressing Force in Pre-Tensioned Members

10.3 Transfer of Prestressing Force in Post-Tensioned Members

11 Design of Prestressed Concrete Flexural Members

11.1 Introduction

11.2 Guidelines for Fixing the Preliminary Dimensions of Flexural Members

11.3 Evaluation of the Self-Weight of the Members

11.4 Partial Safety Factors for Loads

11.5 Partial Safety Factors for Material

11.6 Design Examples for Prestressed Concrete Members

11.7 Design of Prestressed Concrete Members using Trial and Error Approach Based Section Design

11.8 Example on Elastic Design of Composite Sections

11.9 Example on Prestressing of Concrete Members in Stages

11.10 Example on Design of Continuous Beams

11.11 Analysis and Design of Continuous Beam using Load Balancing Concepts

12 Design of Prestressed Slabs

12.1 Introduction

12.2 Design of Prestressed Concrete One-Way Slab

12.3 Two-Dimensional Load Balancing

12.4 Shear Force in Slab Supported on Edges

12.5 Distribution of Prestressing Tendons in Prestressed Concrete Flat Slabs

12.6 Equivalent Frame Method

12.7 Notes on Minimum Bonded Reinforcements as per ACI Code

12.8 Deflection of Flat Plate Panels

13 Design of Tension Members and Circumferential Prestressing

13.1 Introduction

13.2 Deformation Behavior

13.3 Decompression and Cracking

13.4 Ultimate Tensile Strength and Safety Factors

13.5 Procedure for Design of Tension Members

13.6 IS 1343 Recommendations

13.7 Circumferential Prestressing

13.8 Vertical Prestressing in Tanks

13.9 Crack Controls in Walls of Circular Prestressed Concrete Tanks

13.10 Design of Shell Roof Dome of Tank

13.11 Design of Prestressed Ring Beams

14 Design of Compression Members

14.1 Introduction

14.2 Analysis of Prestressed Compression Members

14.3 Analysis of Columns under Eccentric Load

14.4 Ultimate Failure Load of Short Columns under Combined Axial Compression and Moment

14.5 Analysis and Design of Prestressed Concrete Slender Columns

14.6 Procedure for the Design of Slender or Long Columns

14.7 Analysis and Design of Compression Members in Bi-Axial Bending

14.8 Design of Prestressed Concrete Piles

Review Questions

Practice Problems

Appendix A: Geometrical Properties of Standard Sections

Appendix B: Properties of Steel Strands, Wires, and Bars

Appendix C: Short Questions and Answers

Bibliography

Index

This book is very through on content and very useful for UG & PG programmed