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Design Guide 1: Base Connection Design for Steel Structures (Third Edition), 2024
- Base Connection Design for Steel Structures
- Copyright
- Authors, Acknowledgments, Preface
- Table of Contents
- Chapter 1 Introduction
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- 1.1 General
- 1.2 History and Advancements
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- 1.2.1 Previous Editions of Design Guide 1 and Research Synthesis
- 1.22 Relevant Developments since the Publication of Design Guide 1, 2nd Ed.
- 1.3 Scope, Updates, and Preview
- Chapter 2 Materials - Specifications, Selection, and Other Considerations
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- 2.1 Base Plate and Anchor Rod Material Specifications
- 2.2 Base Plate Material Selection
- 2.3 Anchor Rod Selection (Material, Type, and Weldability)
- 2.4 Weld Materials
- 2.5 Grout Materials
- 2.6 Concrete Materials
- Chapter 3 Base Selection, Design, and Simulation
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- 3.1 Overview and Organization
- 3.2 Base Connection Configurations
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- 3.2.1 Base Connections for Columns without
Braces
- 3.22 Base Connections for Columns with Braces
- 3.3 Interaction of Base Connections with Frames
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- 3.3.1 General Observations about Base Connection Load-Deformation Response
- 3.3.2 Modeling Base Connections for Strong-Base Design
- 3.3.3 Modeling Base Connections for Weak-Base Design
- Chapter 4 Design of Exposed Column Base Connections
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- 4.1 Overview and Organization
- 4.2 Overall Design Process and Flow
- 4.3 Load Combinations
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- 4.3.1 Design for Axial Compression
- 4.3.2 Design for Axial Tension
- 4.3.3 Design for Shear
- 4.3.4 Design for Combined Axial Tension and Shear
- 4.3.5 Design for Combined Axial Compression and Shear
- 4.3.6 Design for Bending
- 4.3.7 Design for Combined Axial Compression and Bending
- 4.3.8 Design for Combined Axial Tension and Bending
- 4.3.9 Design for Combined Axial Compression, Bending, and Shear
- 4.3.10 Design for Combined Axial Tension, Bending, and Shear
- 4.3.11 Design for Combined Axial Compression and Biaxial Bending
- 4.4 Anchorage Design for Concrete Limit States
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- 4.4.1 Approaches for Using Reinforcement to Strengthen Concrete Limit States
- 4.4.2 Use of Strut-and-Tie Methodologies in Anchor Design
- 4.5 Exposed Base Plate Connections - Fabrication and Installation
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- 4.5.1 Base Plate Fabrication and Finishing
- 4.5.2 Base Plate Welding
- 4.5.3 Anchor Rod Holes and Washers
- 4.5.4 Anchor Rod Placement and Tolerances
- 4.5.5 Column Erection Procedures
- 4.5.6 Grouting Requirements
- 4.6 Exposed Column Base Connections - Repair and Field Fixes
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- 4.6.1 Anchor Rods in the Wrong Position
- 4.6.2 Anchor Rods Bent or Not Vertical
- 4.6.3 Anchor Rod Projection Too Long or Too Short
- 4.6.4 Anchor Rod Pattern Rotated 90
- 4.7 Design Examples
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- Example 4.7-1 Base Connection for Concentric Axial Compression Load (No Concrete Refinement)
- Example 4.7-2 Base Connection for Concentric Axial Compression Load (Using Concrete Confinement)
- Example 4.7-3 Base Connection for Concentric Axial Tension Load
- Example 4.7-4 Base Connection for Concentric Shear Load (Limited by Edge Distance)
- Example 4.7-5 Base Connection for Concentric Shear Load (Shear Lug Design)
- Example 4.7-6 Base Connection for Anchor Rods Resisting Combined Tension and Shear
- Example 4.7-7 Base Connection at Brace Producing Combined Tension and Shear
- Exaple 4.7-8 Base Connection at Brace Producing Combined Compression and Shear
- Example 4.7-9 Base Connection for Bending
- Example 4.7-10 Base Connection for Bending without Anchor Rod Tension (Low Moment)
- Example 4.7-11 Base Connection for Bending with Anchor Rod Tension (Large Moment)
- Example 4.7-12 Base Connection for Bending with Anchor Rod Tension (Large Moment)
- Example 4.7-13 Base Connection for Bending with Anchor Rod Tension (Low Moment)
- Example 4.7-14 Base Connection for Biaxial Bending with Axial Compression
- Example 4.7-15 Anchor Reinforcement Design
- Chapter 5 Design of Embedded Base Connections
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- 5.1 Context for Use of Embedded Base Connections
- 5.2 Connection Configurations and Load Resistance Mechanisms [Go to Page]
- 5.2.1 Type I Connections
- 5.2.2 Type II Connections
- 5.3 Design Method for Combined Bending, Shear, and Axial Force
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- Example 5.3-1 Embedded Base Connection for Bending, Shear, and Axial Compression
- 5.4 Fabrication and Installation
- Chapter 6 Design of Column Base Connections for Seismic Loading
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- 6.1 Overview and Organization
- 6.2 Seismic Performance Requirements for Column Bases
- 6.3 Influence of Grade Beams and Other Footing Effects
- 6.4 Design Method for Seismic Design of Column Base Connections in Moment Frames
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- 6.4.1 Strong-Base Design for Seismic Conditions
- 6.4.2 Weak-Base Design
For Seismic Conditions
- Example 6.4-1 Weak-Base Design of a Base Plate Connection with Ductile Anchor Rods
- 6.5 Seismic Design of Braced Frame Base Plate Connections
- Appendix A Special Considerations for Double-Nut Joints, Pretension Joints, and Special Structures
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- A.1 Design Requirements
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- A.1.1 Compression Limit State for Anchor Rods
- A.1.2 Tensile Fatigue Limit State for Anchor Rods
- A.2 Installation Requirements for Pretensioned Joints
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- A.2.1 Double-Nut Joints
- A.2.2 Pretensioned Joints
- A.3 Inspection and Maintenance After Installation
- Appendix B Alternate Methods for Design
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- B.1 Context and Motivation
- B.2 Triangular Pressure Distribution
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- B.2.1 Introduction
- B.2.2 Determining Required Base Plate Thickness from Required Strength
- B.2.3 Determination of Required Stress and Effects of Eccentricity
- B.2.4 Design Procedure
- Example B.2-1 Base Connection for Bending without Anchor Rod Tension (Low Moment), Triangular Pressure Distribution
- Example B.2-2 Base Connection for Bending with Anchor Rod Tension (Large Moment), Triangular Pressure Distribution
- B.3 Design of Base Plates under Axial Compression Considering Flexibility
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- Example B.3-1 Base Connection for Concentric Axial Compression Load (with Concrete Confinement)
- B.4 Design of Base Plate Bearing Interface under Two-Way Bending
- Appendix C Guidance for Simulating Column Base Connections in Structural Analysis
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- C.1 Introduction
- C.2 Rotational Stiffness Models
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- C.2.1 Estimation of Rotational Stiffness for Exposed Column Base Connections
- C.2.2 Estimation of Rotational Stiffness for Shallowly Embedded or Blockout Base Connections
- C.2.3 Estimation of Rotational Stiffness for Embedded Base Connections
- C.3 Commentary Regarding Hysteretic Properties of Base Connections
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- C.3.1 Physics of Connection Response
- C.3.2 Simulating Base Connection Hysteretic Response
- Appendix D Guidance for the Use of Finite Element Analysis for Base Plate Analysis and Design, Focused on Exposed Column Base Connection Details [Go to Page]
- D.1 Context and Motivation
- D.2 Problem Scope and Statement
- D.3 Model Constructs
- D.4 Geometry, Boundary Conditions, and Contact/Interactions
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- D.4.1 Representation of Geometry of Components
- D.4.2 Application of Boundary Conditions and Loads
- D.5 Finite Element Types and Material Properties
- D.6 Verification of Results
- D.7 Interpretation of Results
- References
- Back Cover
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