CONTENTS Preface to the Fifth Edition vii Preface to the First Edition ix List of Symbols xvii CHAPTER I:CONCEPTS IN PRESTRESSING 1 1.1 Definition, 1 1 2 Stress Distribution, 5 1.3 Profile of Tendons, 8 1.4 Load Balancing Method, 13 1.5 Basic Phases of Loading in Prestressed Construction, 22 1.6 Materials, 23 CHAPTER II:PRESTRESSING SYSTEM AND LOSSES OF PRESTRESS 33 2.1 Classification, 33 2.2 External or Internal Prestressing System, 33 2.3 Linear or Circular Prestressing, 34 2 4 Pre-tensioning, 34 2.5 Post-tensioning System, 35 2 6 Partial Prestressed Concrete, 36 2.7 Classification Based on Methods of Prestressing, 36 2.8 Loss of Prestress, 40 2.9 Loss of Prestress due to Creep in Steel, 40 2.10 Loss of Prestress due to Shrinkage of Concrete, 40 2.11 Loss of Prestress due to Creep in Concrete, 41 2.12 Loss of Prestress due to Steam Curing, 41 2.13 Loss of Prestress due to Elastic Shortening of the Member, 41 2.14 Loss of Prestress due to Anchorage Take-up, 42 2.15 Loss of Prestress due to Bending of the Member, 42 2.16 Loss of Prestress due to Friction, 43 CHAPTER III:WORKING STRESS DESIGN OF SIMPLE BEAMS 54 3.1Introduction, 54 3.2 Critical Load Conditions, 54 3.3Plexural Design Criterion, 55 3.4Permissible Stresses, 61 3.5 Axially Prestressed Members, 65 3.6 Design of Prestressing Cable for a given Cross Section, 68 3.7 Dimcnsionless Design Variables, 81 3.8 Solution of the Equations, 86 3.9Properties of the Idealised Sections, 88 3.10 Design Procedure Based on Flexure, 90 3.11 Minimum Weight Design by Computer, 99 3.12 Design by Lend Balancing Method, 103 3.13 Multiple Stage Prestressing, 108 CHAPTER IV:PRESTRESSED CONCRETE COMPOSITE BEAMS 115 4.1 Introduction, 115 4.2 Allowable Stress Considerations, 116 4.3 Nondimensionalised Allowable Stress Equations, 120 4.4 Solution of the Governing Equations, 123 4.5 Ranges of Nondimensionalised Parameters, 124 4.6 Shrinkage Stresses, 125 CHAPTER V:CONTINUOUS BEAMS 136 5.1Introduction, 136 5.2Analysis of Two Span Beam, 138 5.3 Analysis of Two Span Continuous Beam with Eccentricities at Outer Supports, 143 5.4 Fixed End Bending Moments, 145 5.5 Application of Moment Distribution Procedure. 149 5.6 Continuous Beams with Variable Section. 154 5 7 Design of Continuous Bearm, 159 5.8 Load Balancing Method, 167 CHAPTER VI:MISCELLANEOUS STRUCTURAL MEMBERS 174 6.1 Introduction, 174 6.2 Compression Members. 174 6.3 Tension Members,182 6.4 Prestressed Concrete Pavements, 191 CHAPTER VII: LIMIT STATES DESIGN 193 7.1 Introduction, 193 7.2 Types of Prestressed Concrete Structures, 202 7.3 Strength Limit State in Flexure, 204 7.4 Limit State of Strength-Shear Capacity, 211 7.5 Design for Limit State of Strength in Shear, 213 7.6 Design for Limit State of Strength Torsion.215 7.7 Limit State Strength at Transfer Condition,218 7.8 Flanged Sections and Their Moment Capacity,219 7.9 Limit State of Serviceability-Allowable Stresses, 222 7.10 Limit State of Cracking,225 7.11 Limit State of Deflection, 225 7.12 Durability Limit State, 227 7.13 Design Procedure, 229 7.14 Design of Short Span Beams, 231 7.15 Short Span Axially Prestressed Beams, 250 7.16 Medium Span Beams, 273 7.17 Long Span Beams, 280 CHAPTER VIII:ULTIMATE LOAD DESIGN OF PRESTRESSED CONCRETE BEAMS 300 8.1 Introduction, 300 8.2 Resisting Moment Capacity of a Section, 301 8.3 Moment Capacity of a Section Initiated by Yielding of Tension Steel (Tension Failure), 302 8.4 Ultimate Moment Capacity in Primary Compression, 307 8.5 Moment Capacity of Unbounded Construction, 311 8.6 Load Factors, 311 8.7 Ultimate Strength Design of Rectangular Cross Sections, 313 8.8 Design of Flanged Sections,317 8.9 Principal Tensile Stress,321 8.10 Failure Due to Shear,323 8.11 Compressive Strength of Concrete Subjected to Combined Bending and Shear,324 8.12 Ultimate Bending Moment Under Combined Moment and Shear (Moment Shear Failure)326 8.13 Ultimate Moment Under Combined Bending and Shear of 1-girder,328 8.14 Location of Failure Section,330 8.15 Suggestions from Experimental Investigations,332 CHAPTER IX:LIMIT STATE DESIGN OF PARTIALLY PRESTRESSED CONCRETE BEAMS 338 9.1 Introduction,338 9.2 Balanced Moment Capacity of Rectangular Sections,339 9.3 Moment Capacity of Flanged Sections,342 9.4 Design for Shear and Serviceability,344 9.5 Design Examples,346 9.6 Comparison of Design Detail by Different Methods.377 CHAPTER X:DESIGN OF PRESTRESSED CONCRETE SLABS 383 10.1 Introduction,383 10.2 One-way Slab,383 10.3 Two-way Slab,390 10.4 Prestressed Concrete Beam and Slab Construction,395 10.5 Prestressed Concrete Flat Slab,396 CHAPTER XI:DESIGN OF FOLDED PLATES AND SHELL STRUCTURES 404 11.1 Introduction, 404 11.2 Design of Folded Plates,405 11.3 Introduction to Prestressed Concrete Shells.410 11.4 Design of Cylindrical Tanks,410 11.5 Dome-ring Construction, 416 11.6 Introduction to Prestressed Concrete Cylindrical Shell, 431 11.7 Design of Cylindrical Shell Using ASCE Manual 31, 432 11.8 Design of Cylindrical Shells by Using Design Coefficients,460 11.9 Some Recommended Specifications for Shell and Folded Plate Structures, 465 CHAPTER XII:BOND IN PRESTRESSED CONCRETE 468 12.1 Introduction, 468 12.2 Bond in Pre-tensioned Construction,468 12.3 Bond in Post-tensioned Construction, 473 CHAPTKR XIII:ANCHORAGE OF PRES PRESSING CABLES477 13.1 Post-tensioned Construction,477 13.2 Prestressing Cable at the Centroidal Axis, 478 13.3 Symmetric Multiple Cables Causing Axial Thrust, 484 13.4 Cable with Eccentricity, 486 13.5 Inclined Prestressing Cable, 488 13.6 Spalling Stresses,488 CHAPTER XIV:SOME POINT OF INTEREST IN PRESTRESSED CONCRETE CONSTRUCTION 490 14.1 High Tensile Steels, 490 14.2 Concrete, 492 14.3 Bond Failure,496 14.4 Fire Resistance,496 14.5 Handling and Transportation,498 CHAPTER XV: DESIGN OF PRESTRESSED CONCRETE BRIDGE 499 Appendix A-Tables, 563 Table 1 Values of for full stress condition. Table 2 Sectional properties. Table 3 Fixed-end moments due to prestressing force. Table 4 Membrane forces and displacements in simply supported cylindrical shell, uniformly distributed load. Table 5 Membrane forces and displacements in simply supported cylindrical shell. Loads varying from zero at the end to maximum at the middle. Table 6 Symmetrical edge loads on simply supported cylindrical shells (Force coefficients). Table 7 Symmetrical edge loads on simply supported cylindrical shells (Deformation coefficients). Table 8 Edge loads on simply supported cylindrical shells. Appendix B-Objective Questions and Answers 637 Appendix C-Qualitative Questions and Solutions 678 Appendix D-References 719 Index 747