TABLE OF CONTENTS

Foreword
Preface
Acknowledgments

Chapter 1. Introduction
1.1 Basic Features
1.2 Terminology
1.3 Invention
1.4 Early U.S. Patents
1.5 Periods of Use
1.6 Modern Applications
1.7 Environmental Sustainability

Chapter 2. Installation
2.1 Equipment
2.2 General Procedures
2.3 Special Procedures
2.4 Installation Safety
2.5 Torque Measurement
2.6 Torque Calibration
2.7 Field Inspection

Chapter 3. Basic Geotechnics
3.1 Subsurface Exploration
3.2 Field Penetration Resistance
3.3 Soil Classification
3.4 Bedrock
3.5 Site Suitability
3.6 Shear Strength

Chapter 4. Bearing Capacity
4.1 Helix Spacing
4.2 Individual Bearing Method
4.3 Cylindrical Shear Method
4.4 Limit State Analysis
4.5 Shaft Adhesion
4.6 LCPC Method
4.7 Pile Deflection
4.8 Simple Buckling
4.9 Advanced Buckling
4.10 Down Drag

Chapter 5. Pullout Capacity
5.1 Theoretical Capacity
5.2 Minimum Embedment
5.3 Effect of Ground Water
5.4 Group Efficiency
5.5 Structural Capacity
5.6 Cyclic Loading

Chapter 6. Capacity-to-Torque Ratio
6.1 Early Empirical Work
6.2 New Empirical Justification
6.3 Energy Model
6.4 Simple Shaft Friction Model
6.5 Other Theoretical Methods
6.6 Precautions
6.7 Exploration with Helical Pile

Chapter 7. Axial Load Testing
7.1 Compression
7.2 Tension
7.3 Loading Procedures
7.4 Interpretation of Results
7.5 Other Interpretations

Chapter 8. Reliability and Sizing
8.1 Factor of Safety
8.2 Helix Sizing
8.3 Computer-Aided Sizing
8.4 Statistics
8.5 Field Adjustments
8.6 Reliability

Chapter 9. Expansive Soil Resistance
9.1 Expansive Soils
9.2 Foundations on Expansive Soils
9.3 Active Zone
9.4 Pile Design
9.5 Early Refusal Condition

Chapter 10. Lateral Load Resistance
10.1 Rigid Pile Analysis
10.2 Flexible Pile Analysis
10.3 Pile Groups
10.4 Effect of Helical Bearing Plates
10.5 Effect of Couplings
10.6 Lateral Load Tests
10.7 Empirical Results
10.8 Lateral Restraining Systems
10.9 Seismic Resistance

Chapter 11. Corrosion and Life Expectancy
11.1 Corrosion Basics
11.2 Galvanic Corrosion
11.3 Zinc Coatings
11.4 Passivity
11.5 Powder Coating
11.6 Design Life
11.7 Sacrificial Anodes
11.8 Special Topics

Chapter 12. Foundation Systems
12.1 Basic Foundation Plan
12.2 Foundation Loads
12.3 Pile Cap Design
12.4 Manufactured Pile Caps
12.5 Bridges and Boardwalks
12.6 Concreteless Design
12.7 Lateral Bracing

Chapter 13. Earth Retention Systems
13.1 Lateral Earth Pressure
13.2 Retaining Walls
13.3 Excavation Shoring
13.4 Timber Lagging
13.5 Helical Soil Nails
13.6 Grading and Drainage
13.7 Post-Tensioning
13.8 Wall Repair

Chapter 14. Underpinning Systems
14.1 Foundation Repair
14.2 Underpinning Brackets
14.3 Rotational Bracing
14.4 Floor Slab Support
14.5 Braced Excavations

Chapter 15. Economics
15.1 Cost and Availability
15.2 Foundation Economics
15.3 Measurement and Payment

Chapter 16. Proprietary Systems
16.1 Grouting Systems
16.2 Ground Anchors
16.3 Special Helix Shapes
16.4 Underpinning Systems
16.5 Enhanced Lateral Resistance
16.6 Composite Piles
16.7 Special Couplings
16.8 Future Developments

Chapter 17. Building Codes
17.1 IBC 2006
17.2 IBC 2009
17.3 Product Evaluation Reports
17.4 AC358 Criteria Development
17.5 New Evaluation Criteria
17.6 Forthcoming Codes

Appendix A. Common Symbols and Abbreviations
Appendix B. U.S. Helical Pile Patents
Appendix C. Load Tests Results
Appendix D. Nomenclature
Glossary of Terms
Bibliography
Index

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