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eLibrary >
AISI S240-15: North American Standard for Cold-Formed Steel Structural Framing, 2015 Edition >
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AISI S240-15: North American Standard for Cold-Formed Steel Structural Framing, 2015 Edition, 2015
- DISCLAIMER
- PREFACE
- AISI COMMITTEE ON FRAMING STANDARDS [Go to Page]
- GENERAL PROVISIONS SUBCOMMITTEE
- DESIGN METHODS SUBCOMMITTEE
- LATERAL DESIGN SUBCOMMITTEE
- STANDARD PRACTICES SUBCOMMITTEE
- TRUSS DESIGN SUBCOMMITTEE
- NORTH AMERICAN STANDARD FOR COLD-FORMED STEEL STRUCTURAL FRAMING
- A. GENERAL [Go to Page]
- A1 Scope
- A2 Definitions [Go to Page]
- A2.1 Terms
- A3 Material
- A4 Corrosion Protection
- A5 Products [Go to Page]
- A5.1 Base Steel Thickness
- A5.2 Minimum Flange Width
- A5.3 Product Designator
- A5.4 Manufacturing Tolerances
- A5.5 Product Identification [Go to Page]
- A5.5.1 Identification of Groups of Like Members
- A5.5.2 Identification of Individual Framing Members
- A6 Reference Documents
- B. DESIGN [Go to Page]
- B1 General [Go to Page]
- B1.1 Loads and Load Combinations [Go to Page]
- B1.1.1 Application of Live Load Reduction on Wall Studs
- B1.1.2 Application of Wind Loads on Wall Studs in the United States and Mexico
- B1.2 Design Basis [Go to Page]
- B1.2.1 Floor Joists, Ceiling Joists and Roof Rafters
- B1.2.2 Wall Studs
- B1.2.3 In-Line Framing
- B1.2.4 Sheathing Span Capacity
- B1.2.5 Load Path
- B1.2.6 Principles of Mechanics
- B1.3 Built-Up Section Design
- B1.4 Properties of Sections
- B1.5 Connection Design [Go to Page]
- B1.5.1 Screw Connections [Go to Page]
- B1.5.1.1 Steel-to-Steel Screws
- B1.5.1.2 Sheathing Screws
- B1.5.1.3 Spacing and Edge Distance
- B1.5.1.4 Gypsum Board
- B1.5.2 Welded Connections
- B1.5.3 Bolts
- B1.5.4 Power-Actuated Fasteners
- B1.5.5 Other Connectors
- B1.5.6 Connection to Other Materials
- B2 Floor and Ceiling Framing [Go to Page]
- B2.1 Scope
- B2.2 Floor Joist Design [Go to Page]
- B2.2.1 Bending [Go to Page]
- B2.2.1.1 Lateral-Torsional Buckling
- B2.2.1.2 Distortional Buckling
- B2.2.2 Shear
- B2.2.3 Web Crippling
- B2.2.4 Bending and Shear
- B2.2.5 Bending and Web Crippling
- B2.3 Ceiling Joist Design [Go to Page]
- B2.3.1 Tension
- B2.3.2 Compression [Go to Page]
- B2.3.2.1 Yielding, Flexural, Flexural-Torsional and Torsional Buckling
- B2.3.2.2 Distortional Buckling
- B2.3.3 Bending [Go to Page]
- B2.3.3.1 Lateral-Torsional Buckling
- B2.3.3.2 Distortional Buckling
- B2.3.4 Shear
- B2.3.5 Web Crippling
- B2.3.6 Axial Load and Bending
- B2.3.7 Bending and Shear
- B2.3.8 Bending and Web Crippling
- B2.4 Floor Truss Design
- B2.5 Bearing Stiffeners
- B2.5.1 Clip Angle Bearing Stiffeners
- B2.6 Bracing Design
- B2.7 Floor Diaphragm Design
- B3 Wall Framing [Go to Page]
- B3.1 Scope
- B3.2 Wall Stud Design [Go to Page]
- B3.2.1 Available Axial Strength [Factored Resistance] [Go to Page]
- B3.2.1.1 Yielding, Flexural, Flexural-Torsional and Torsional Buckling
- B3.2.1.2 Distortional Buckling
- B3.2.2 Bending [Go to Page]
- B3.2.2.1 Lateral-Torsional Buckling
- B3.2.2.2 Distortional Buckling
- B3.2.3 Shear
- B3.2.4 Axial Load and Bending
- B3.2.5 Web Crippling [Go to Page]
- B3.2.5.1 Stud-to-Track Connection for C-Section Studs
- B3.2.5.2 Deflection Track Connection for C-Section Studs
- B3.3 Header Design [Go to Page]
- B3.3.1 Back-to-Back Headers [Go to Page]
- B3.3.1.1 Bending
- B3.3.1.2 Shear
- B3.3.1.3 Web Crippling
- B3.3.1.4 Bending and Shear
- B3.3.1.5 Bending and Web Crippling
- B3.3.2 Box Headers [Go to Page]
- B3.3.2.1 Bending
- B3.3.2.2 Shear
- B3.3.2.3 Web Crippling
- B3.3.2.4 Bending and Shear
- B3.3.2.5 Bending and Web Crippling
- B3.3.3 Double L-Headers [Go to Page]
- B3.3.3.1 Bending [Go to Page]
- B3.3.3.1.1 Gravity Loading
- B3.3.3.1.2 Uplift Loading
- B3.3.3.2 Shear
- B3.3.3.3 Web Crippling
- B3.3.3.4 Bending and Shear
- B3.3.3.5 Bending and Web Crippling
- B3.3.4 Single L-Headers [Go to Page]
- B3.3.4.1 Bending [Go to Page]
- B3.3.4.1.1 Gravity Loading
- B3.3.4.1.2 Uplift Loading
- B3.3.4.2 Shear
- B3.3.4.3 Web Crippling
- B3.3.4.4 Bending and Shear
- B3.3.4.5 Bending and Web Crippling
- B3.3.5 Inverted L-Header Assemblies
- B3.4 Bracing
- B3.4.1 Intermediate Brace Design
- B3.5 Serviceability
- B4 Roof Framing
- B4.1 Scope
- B4.2 Roof Rafter Design [Go to Page]
- B4.2.1 Tension
- B4.2.2 Compression [Go to Page]
- B4.2.2.1 Yielding, Flexural, Flexural-Torsional and Torsional Buckling
- B4.2.2.2 Distortional Buckling
- B4.2.3 Bending [Go to Page]
- B4.2.3.1 Lateral-Torsional Buckling
- B4.2.3.2 Distortional Buckling
- B4.2.4 Shear
- B4.2.5 Web Crippling
- B4.2.6 Axial Load and Bending
- B4.2.7 Bending and Shear
- B4.2.8 Bending and Web Crippling
- B4.3 Roof Truss Design
- B4.4 Bearing Stiffeners
- B4.5 Bracing Design
- B4.6 Roof Diaphragm Design
- B5 Lateral Force-Resisting Systems [Go to Page]
- B5.1 Scope
- B5.2 Shear Wall Design [Go to Page]
- B5.2.1 General [Go to Page]
- B5.2.1.1 Type I Shear Walls
- B5.2.1.2 Type II Shear Walls
- B5.2.2 Nominal Strength [Resistance] [Go to Page]
- B5.2.2.1 Type I Shear Walls
- B5.2.2.2 Type II Shear Walls
- B5.2.2.3 Nominal Strength [Resistance] per Unit Length [Go to Page]
- B5.2.2.3.1 General Requirements
- B5.2.2.3.2 Steel Sheet Sheathing [Go to Page]
- B5.2.2.3.2.1 Effective Strip Method
- B5.2.2.3.3 Wood Structural Panel Sheathing
- B5.2.2.3.4 Gypsum Board Panel Sheathing
- B5.2.2.3.5 Fiberboard Panel Sheathing
- B5.2.2.3.6 Combined Systems
- B5.2.3 Available Strength [Factored Resistance]
- B5.2.4 Collectors and Anchorage [Go to Page]
- B5.2.4.1 Collectors and Anchorage for In-Plane Shear [Go to Page]
- B5.2.4.1.1 Type I Shear Walls
- B5.2.4.1.2 Type II Shear Walls
- B5.2.4.2 Uplift Anchorage at Wall Ends [Go to Page]
- B5.2.4.2.1 General
- B5.2.4.2.2 Type I Shear Walls
- B5.2.4.2.3 Type II Shear Walls
- B5.2.4.3 Uplift Anchorage Between Type II Shear Wall Ends
- B5.2.5 Design Deflection
- B5.3 Strap Braced Wall Design [Go to Page]
- B5.3.1 General
- B5.3.2 Nominal Strength [Resistance]
- B5.3.3 Available Strength [Factored Resistance]
- B5.3.4 Collectors and Anchorage [Go to Page]
- B5.3.4.1 Collectors and Anchorage for In-Plane Shear
- B5.3.4.2 Uplift Anchorage at Wall Ends
- B5.3.5 Design Deflection
- B5.4 Diaphragm Design [Go to Page]
- B5.4.1 General
- B5.4.2 Nominal Strength
- B5.4.3 Available Strength
- B5.4.4 Design Deflection [Go to Page]
- B5.4.4.1 Blocked Diaphragms
- B5.4.4.2 Unblocked Diaphragms
- B5.4.5 Beam Diaphragm Tests for Non-Steel Sheathed Assemblies
- C. INSTALLATION
- C1 General
- C2 Material Condition [Go to Page]
- C2.1 Web Holes
- C2.2 Cutting and Patching
- C2.3 Splicing
- C3 Structural Framing [Go to Page]
- C3.1 Foundation
- C3.2 Ground Contact
- C3.3 Floors [Go to Page]
- C3.3.1 Plumbness and Levelness
- C3.3.2 Alignment
- C3.3.3 Bearing Width
- C3.3.4 Web Separation
- C3.4 Walls [Go to Page]
- C3.4.1 Straightness, Plumbness and Levelness
- C3.4.2 Alignment
- C3.4.3 Stud-to-Track Connection
- C3.4.4 Back-to-Back and Box Headers
- C3.4.5 Double and Single L-Headers
- C3.4.6 Inverted L-Header Assemblies
- C3.5 Roofs and Ceilings [Go to Page]
- C3.5.1 Plumbness and Levelness
- C3.5.2 Alignment
- C3.5.3 End Bearing
- C3.6 Lateral Force-Resisting Systems [Go to Page]
- C3.6.1 Shear Walls
- C3.6.2 Strap Braced Walls
- C3.6.3 Diaphragms
- C4 Connections [Go to Page]
- C4.1 Screw Connections [Go to Page]
- C4.1.1 Steel-to-Steel Screws
- C4.1.2 Installation
- C4.1.3 Stripped Screws
- C4.2 Welded Connections
- C5 Miscellaneous [Go to Page]
- C5.1 Utilities [Go to Page]
- C5.1.1 Holes
- C5.1.2 Plumbing
- C5.1.3 Electrical
- C5.2 Insulation [Go to Page]
- C5.2.1 Mineral Fiber Insulation
- C5.2.2 Other Insulation
- D. QUALITY CONTROL AND QUALITY ASSURANCE [Go to Page]
- D1 General [Go to Page]
- D1.1 Scope and Limits of Applicability
- D1.2 Responsibilities
- D2 Quality Control Programs
- D3 Quality Control Documents [Go to Page]
- D3.1 Documents to be Submitted [Go to Page]
- D3.1.1 Additional Requirements for Lateral Force-Resisting Systems [Go to Page]
- D3.1.1.1 Component Assemblies
- D3.1.1.2 Other Than Component Assemblies
- D3.1.1.3 Exceptions to Sections D3.1.1.1 and D3.1.1.2
- D3.2 Available Documents
- D4 Quality Assurance Agency Documents
- D5 Inspection Personnel [Go to Page]
- D5.1 Quality Control Inspector
- D5.2 Quality Assurance Inspector
- D6 Inspection Tasks [Go to Page]
- D6.1 General
- D6.2 Quality Control Inspection Tasks
- D6.3 Quality Assurance Inspection Tasks
- D6.4 Coordinated Inspection
- D6.5 Material Verification
- D6.6 Inspection of Welding
- D6.7 Inspection of Mechanical Fastening
- D6.8 Inspection of Cold-Formed Steel Light-Frame Construction
- D6.9 Additional Requirements for Lateral Force-Resisting Systems [Go to Page]
- D6.9.1 Fit-Up of Welds
- D7 Nonconforming Material and Workmanship [Go to Page]
- D7.1 Additional Inspections
- D7.2 Rejection of Material
- E. TRUSSES [Go to Page]
- E1 General [Go to Page]
- E1.1 Scope and Limits of Applicability
- E2 Truss Responsibilities
- E3 Loading
- E4 Truss Design [Go to Page]
- E4.1 Materials
- E4.2 Corrosion Protection
- E4.3 Analysis
- E4.4 Member Design [Go to Page]
- E4.4.1 Properties of Sections
- E4.4.2 Compression Chord Members
- E4.4.3 Tension Chord Members
- E4.4.4 Compression Web Members
- E4.4.5 Tension Web Members
- E4.4.6 Eccentricity in Joints
- E4.5 Gusset Plate Design
- E4.6 Connection Design [Go to Page]
- E4.6.1 Fastening Methods
- E4.6.2 Coped Connections for C-Shaped Sections
- E4.7 Serviceability
- E5 Quality Criteria for Steel Trusses [Go to Page]
- E5.1 Manufacturing Quality Criteria
- E5.2 Member Identification
- E5.3 Assembly
- E6 Truss Installation [Go to Page]
- E6.1 Installation Tolerances [Go to Page]
- E6.1.1 Straightness
- E6.1.2 Plumbness
- E6.1.3 Top Chord Bearing Trusses
- E7 Test-Based Design
- F. TESTING [Go to Page]
- F1 General
- F2 Truss Components and Assemblies
- APPENDIX 1, CONTINUOUSLY BRACED DESIGN FOR DISTORTIONAL BUCKLING RESISTANCE
- APPENDIX 2, TEST METHODS FOR TRUSS COMPONENTS AND ASSEMBLIES [Go to Page]
- 2.1 Component Structural Performance Load Test [Go to Page]
- 2.1.1 Flexural Test [Go to Page]
- 2.1.1.1 Number of Test Specimens
- 2.1.1.2 Materials
- 2.1.1.3 Test Apparatus
- 2.1.1.4 Load and Deflection Measuring Devices
- 2.1.1.5 Loading Procedures
- 2.1.1.6 Interpretation of Test Results
- 2.1.1.7 Report
- 2.1.2 Compression Test
- 2.2 Full-Scale Confirmatory Load Test [Go to Page]
- 2.2.1 Test Specimen
- 2.2.2 Number of Test Specimens
- 2.2.3 Materials
- 2.2.4 Fabrication
- 2.2.5 Test Apparatus
- 2.2.6 Load and Deflection Measuring Devices
- 2.2.7 Loading Procedures [Go to Page]
- 2.2.7.1 Tests to Confirm Deflection
- 2.2.7.2 Tests to Confirm Available Strength [Factored Resistance] Assumptions
- 2.2.8 Interpretation of Test Results
- 2.2.9 Report
- 2.3 Full-Scale Structural Performance Load Test [Go to Page]
- 2.3.1 Test Specimen
- 2.3.2 Number of Test Specimens
- 2.3.3 Materials
- 2.3.4 Fabrication
- 2.3.5 Test Apparatus
- 2.3.6 Load and Deflection Measuring Devices
- 2.3.7 Loading Procedures
- 2.3.8 Interpretation of Test Results
- 2.3.9 Report
- COMMENTARY ON NORTH AMERICAN STANDARD FOR COLD-FORMED STEEL FRAMING [Go to Page]
- DISCLAIMER
- PREFACE
- COMMENTARY ON THENORTH AMERICAN STANDARD FOR COLD-FORMED STEEL STRUCTURAL FRAMING
- A. GENERAL
- A1 Scope
- A2 Definitions
- A2.1 Terms
- A3 Material
- A4 Corrosion Protection
- A5 Products
- A5.2 Minimum Flange Width
- B DESIGN [Go to Page]
- B1 General [Go to Page]
- B1.1 Loads and Load Combinations [Go to Page]
- B1.1.1 Live Load Reduction on Wall Studs
- B1.1.2 Wind Loading Considerations in the United States and Mexico
- B1.2 Design Basis [Go to Page]
- B1.2.1 Floor Joists, Ceiling Joists and Roof Rafters
- B1.2.2 Wall Studs
- B1.2.3 In-Line Framing [Go to Page]
- B1.2.5.2 Principles of Mechanics
- B1.3 Built-Up Sections
- B1.5 Connection Design [Go to Page]
- B1.5.1 Screw Connections [Go to Page]
- B1.5.1.1 Steel-to-Steel Screws
- B1.5.1.3 Spacing and Edge Distance
- B1.5.1.4 Gypsum Board
- B1.5.2 Welded Connections
- B1.5.3 Bolts
- B1.5.4 Power-Actuated Fasteners
- B1.5.5 Other Connectors
- B2 Floor and Ceiling Framing [Go to Page]
- B2.5 Bearing Stiffeners
- B2.6 Bracing Design
- B3 Wall Framing [Go to Page]
- B3.2 Wall Stud Design [Go to Page]
- B3.2.1 Axial Load
- B3.2.5 Web Crippling [Go to Page]
- B3.2.5.1 Stud-to-Track Connection for C-Section Studs
- B3.2.5.2 Deflection Track Connection for C-Section Studs
- B3.3 Header Design [Go to Page]
- B3.3.1 Back-to-Back Headers
- B3.3.2 Box Headers
- B3.3.3 Double L-Headers [Go to Page]
- B3.3.3.1.1 Gravity Loading
- B3.3.3.1.2 Uplift Loading
- B3.3.4 Single L-Headers
- B3.3.5 Inverted L-Header Assemblies
- B3.4 Bracing [Go to Page]
- B3.4.1 Intermediate Brace Design
- B3.5 Serviceability
- B4 Roofing Framing [Go to Page]
- B4.5 Bracing Design
- B5 Lateral Force-Resisting Systems [Go to Page]
- B5.2 Shear Wall Design [Go to Page]
- B5.2.1 General
- B5.2.2 Nominal Strength [Resistance] [Go to Page]
- B5.2.2.1 Type I Shear Walls
- B5.2.2.2 Type II Shear Walls
- B5.2.3 Available Strength [Factored Resistance]
- B5.2.5 Design Deflection
- B5.3 Strap Braced Wall Design
- B5.4 Diaphragm Design [Go to Page]
- B5.4.1 General
- B5.4.2 Nominal Strength
- B5.4.4 Design Deflection
- B5.4.5 Beam Diaphragm Tests for Non-Steel Sheathed Assemblies
- C. INSTALLATION [Go to Page]
- C2 Material Condition [Go to Page]
- C2.1 Web Holes
- C2.2 Cutting and Patching
- C2.3 Splicing
- C3 Structural Framing [Go to Page]
- C3.1 Foundation
- C3.2 Ground Contact
- C3.3 Floors
- C3.4 Walls [Go to Page]
- C3.4.1 Straightness, Plumbness and Levelness
- C3.4.3 Stud-to-Track Connection
- C3.5 Roofs and Ceilings
- C3.6 Lateral Force-Resisting Systems
- C4 Connections [Go to Page]
- C4.1 Screw Connections [Go to Page]
- C4.1.2 Installation
- C4.1.3 Stripped Screws
- C4.2 Welded Connections
- C5 Miscellaneous [Go to Page]
- C5.1 Utilities [Go to Page]
- C5.1.1 Holes
- C5.1.2 Plumbing
- C5.1.3 Electrical
- C5.2 Insulation
- D. QUALITY CONTROL AND QUALITY ASSURANCE [Go to Page]
- D1 General [Go to Page]
- D1.1 Scope and Limits of Applicability
- D1.2 Responsibilities
- D2 Quality Control Programs
- D3 Quality Control Documents [Go to Page]
- D3.1 Documents to be Submitted
- D3.2 Available Documents
- D5 Inspection Personnel [Go to Page]
- D5.1 Quality Control Inspector
- D5.2 Quality Assurance Inspector
- D6 Inspection Tasks [Go to Page]
- D6.1 General
- D6.2 Quality Control Inspection Tasks
- D6.3 Quality Assurance Inspection Tasks
- D6.4 Coordinated Inspection
- D6.5 Material Verification
- D6.6 Inspection of Welding
- D6.7 Inspection of Mechanical Fastening
- D6.8 Inspection of Cold-Formed Steel Light-Frame Construction
- D6.9 Additional Requirements for Lateral Force-Resisting Systems
- E. TRUSSES [Go to Page]
- E1 General [Go to Page]
- E1.1 Scope and Limits of Applicability
- E2 Truss Responsibilities
- E3 Loading
- E4 Truss Design [Go to Page]
- E4.3 Analysis
- E4.4 Member Design [Go to Page]
- E4.4.1 Properties of Sections
- E4.4.2 Compression Chord Members
- E4.4.3 Tension Chord Members
- E4.4.4 Compression Web Members
- E4.4.5 Tension Web Members
- E4.4.6 Eccentricity in Joints
- E4.5 Gusset Plate Design
- E4.6 Connection Design [Go to Page]
- E4.6.1 Fastening Methods
- E4.6.2 Coped Connections for C-Shaped Sections
- E4.7 Serviceability
- E5 Quality Criteria for Steel Trusses
- E6 Truss Installation [Go to Page]
- E6.1.1 Straightness
- E6.1.2 Plumbness
- E7 Test-Based Design
- F. TESTING [Go to Page]
- F1 General
- F2 Truss Components and Assemblies
- APPENDIX 1, CONTINUOUSLY BRACED DESIGN FOR DISTORTIONAL BUCKLING RESISTANCE
- APPENDIX 2, TEST METHODS FOR TRUSS COMPONENTS AND ASSEMBLIES [Go to Page]
- 2.1 Component Structural Performance Load Test
- 2.2 Full-Scale Confirmatory Load Test
- 2.3 Full-Scale Structural Performance Load Test
- REFERENCES [Go to Page]
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