The National Academies Press

NCHRP Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement
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NCHRP Report 679:
Design of Concrete Structures Using High-Strength Steel Reinforcement
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TRB's National Cooperative Highway Research Program (NCHRP) Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement evaulates the existing American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau.

The report also includes recommended language to the AASHTO LRFD Bridge Design Specifications that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi.

The Appendixes to NCHRP Report 679 were published online and include the following:

APPENDIX A?Material Properties

APPENDIX B?Flexural Resistance of Members with Reinforcing Bars Lacking Well- Defined Yield Plateau

APPENDIX C?Strain Limits for Tension-Controlled/Compression-Controlled and Strains to Allow Negative Moment Redistribution

APPENDIX D?Flexure Beam Tests

APPENDIX E?Fatigue of High-Strength Reinforcing Steel

APPENDIX F?Shear Beam Tests

APPENDIX G?Analytical Studies of Columns

APPENDIX H?Beam Splice Tests

APPENDIX I?Crack Control

APPENDIX J?Survey Results

APPENDIX K?Design Examples

APPENDIX L?Proposed Changes to Section 5 of the AASHTO LRFD Specification

APPENDIX M?2010 AASHTO Bridge Committee Agenda Item


Publication Info

83 pages | 8.5 x 11

Table of Contents

skim chapter
Front Matter i-x
Summary 1-4
1.1 Introduction 5-5
1.3.1 Mechanical Properties of A1035 Reinforcing Steel 6-6
1.3.2 Tension Properties of A1035 Reinforcing Steel 7-7
1.3.3 Flexural Reinforcement 8-8
1.3.4 Shear Reinforcement 9-9
1.3.6 Bond and Development 10-10
1.3.7 Serviceability Considerations 11-12
1.3.8 Corrosion Performance of Reinforcing Steel Grades 13-13
1.4 Survey of Use of High-Strength Steel Reinforcement in Bridge Structures 14-14
1.4.2 Reported Use of A1035 Reinforcing Steel in Highway Bridge Infrastructure 15-15
2.2.1 ASTM A1035 Reinforcing Steel 16-17
2.3.1 Flexural Resistance 18-20
2.3.2 Tension-Controlled and Compression-Controlled Strain Limits for High-Strength ASTM A1035 Reinforcing Bars 21-22
2.3.4 Experimental Evaluation 23-24
2.3.5 Summary and Recommendations 25-25
2.4 Fatigue Performance of High-Strength Reinforcing Steel 26-26
2.4.2 Effect of High-Strength Steel on the AASHTO Fatigue Provisions 27-27
2.4.3 Fatigue of Slabs (AASHTO LRFD Section 9) 28-28
2.4.4 Fatigue Test Specimens 29-29
2.4.5 Summary of Fatigue Tests and Conclusions 30-31
2.5.2 Experimental Evaluation 32-36
2.6 Shear Friction 37-37
2.6.1 Experimental Program 38-39
2.6.2 Experimental Results 40-42
2.7 Compression Members 43-43
2.7.1 Column Capacity 44-44
2.7.2 Spacing of Spiral Reinforcement 45-47
2.8.1 Splice Development 48-49
2.8.2 Hook Anchorage 50-54
2.9 Serviceability Considerations 55-55
2.9.1 Deflections of Flexural Members 56-56
2.9.2 Crack Widths 57-57
2.9.3 Summary and Conclusions 58-58
3.1.3 Proposed Changes to Section 9 of the LRFD Specifications 59-60
3.2.2 Flexure 61-61
3.3.1 Application in Seismic Zones 2, 3, and 4 62-62
3.3.5 Control of Flexural Cracking and Corrosion 63-63
References 64-67
Notation 68-71
Appendices 72-72
Abbreviations used without definitions in TRB publications 73-73

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