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AWC NDS 2001

AWC NDS 2001

$27.08

National Design Specification (NDS) for Wood Construction

Published By Publication Date Number of Pages
AWC 2001 185
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PDF Catalog

PDF Pages PDF Title
1 NDS 2001 EDITION
4 FOREWORD
6 TABLE OF CONTENTS
8 LIST OF TABLES
10 LIST OF TABLES IN THE NDS SUPPLEMENT
11 LIST OF FIGURES
12 1 GENERAL REQUIREMENTS FOR STRUCTURAL DESIGN
13 1.1 Scope
1.1.1 Practice Defined
1.1.2 Competent Supervision
1.2 General Requirements
1.2.1 Conformance With Standards
1.2.2 Framing and Bracing
1.3 Standard as a Whole
1.4 Design Loads
1.4.1 Loading Assumptions
14 1.4.2 Governed by Codes
1.4.3 Loads Included
1.4.4 Load Combinations
1.5 Specifications and Plans
1.5.1 Sizes
1.6 Notation
18 2 DESIGN VALUES FOR STRUCTURAL MEMBERS
19 2.1 General
2.1.1 General Requirement
2.1.2 Responsibility of Designer to Adjust for Conditions of Use
2.2 Design Values
2.3 Adjustment of Design Values
2.3.1 Applicability of Adjustment Factors
2.3.2 Load Duration Factor
20 2.3.3 Temperature Factor
2.3.4 Fire Retardant Treatment
22 3 DESIGN PROVISIONS AND EQUATIONS
23 3.1 General
3.1.1 Scope
3.1.2 Net Section Area
3.1.3 Connections
3.1.4 Time Dependent Deformations
3.1.5 Composite Construction
24 3.2 Bending Members – General
3.2.1 Span of Bending Members
3.2.2 Lateral Distribution of Concentrated Load
3.2.3 Notches
3.3 Bending Members – Flexure
3.3.1 Strength in Bending
3.3.2 Flexural Design Equations
3.3.3 Beam Stability Factor
26 3.3.4 Form Factor
3.4 Bending Members – Shear
3.4.1 Strength in Shear Parallel to Grain ( Horizontal Shear)
3.4.2 Shear Design Equations
27 3.4.3 Shear Design
29 3.5 Bending Members – Deflection
3.5.1 Deflection Calculations
3.5.2 Long Term Loading
3.6 Compression Members – General
3.6.1 Terminology
3.6.2 Column Classifications
30 3.6.3 Strength in Compression Parallel to Grain
3.6.4 Compression Members Bearing End to End
3.6.5 Eccentric Loading or Combined Stresses
3.6.6 Column Bracing
3.6.7 Lateral Support of Arches, Studs and Compression Chords of Trusses
3.7 Solid Columns
3.7.1 Column Stability Factor
31 3.7.2 Tapered Columns
3.7.3 Round Columns
3.8 Tension Members
3.8.1 Tension Parallel to Grain
3.8.2 Tension Perpendicular to Grain
32 3.9 Combined Bending and Axial Loading
3.9.1 Bending and Axial Tension
3.9.2 Bending and Axial Compression
3.9.3 Eccentric Compression Loading
33 3.10 Design for Bearing
3.10.1 Bearing Parallel to Grain
3.10.2 Bearing Perpendicular to Grain
3.10.3 Bearing at an Angle to Grain
3.10.4 Bearing Area Factor
34 4 SAWN LUMBER
35 4.1 General
4.1.1 Application
4.1.2 Identification of Lumber
4.1.3 Definitions
4.1.4 Moisture Service Condition of Lumber
4.1.5 Lumber Sizes
4.1.6 End-Jointed or Edge-Glued Lumber
36 4.1.7 Resawn or Remanufactured Lumber
4.2 Design Values
4.2.1 Tabulated Values
4.2.2 Other Species and Grades
4.2.3 Basis for Design Values
4.2.4 Modulus of Elasticity
4.2.5 Bending
37 4.2.6 Compression Perpendicular to Grain
4.3 Adjustment of Design Values
4.3.1 General
4.3.2 Load Duration Factor
4.3.3 Wet Service Factor
4.3.4 Temperature Factor
4.3.5 Beam Stability Factor
4.3.6 Size Factor
38 4.3.7 Flat Use Factor
4.3.8 Incising Factor
4.3.9 Repetitive Member Factor
39 4.3.10 Form Factor
4.3.11 Column Stability Factor
4.3.12 Buckling Stiffness Factor
4.3.13 Bearing Area Factor
4.3.14 Pressure-Preservative Treatment
4.4 Special Design Considerations
4.4.1 Stability of Bending Members
4.4.2 Wood Trusses
40 4.4.3 Notches
42 5 STRUCTURAL GLUED LAMINATED TIMBER
43 5.1 General
5.1.1 Application
5.1.2 Definition
5.1.3 Standard Sizes
5.1.4 Specification
5.1.5 Service Conditions
44 5.2 Design Values
5.2.1 Tabulated Values
5.2.2 Radial Tension
5.2.3 Other Species and Grades
5.3 Adjustment of Design Values
5.3.1 General
5.3.2 Load Duration Factor
5.3.3 Wet Service Factor
5.3.4 Temperature Factor
5.3.5 Beam Stability Factor
45 5.3.6 Volume Factor
5.3.7 Flat Use Factor
5.3.8 Curvature Factor
46 5.3.9 Form Factor
5.3.10 Column Stability Factor
5.3.11 Bearing Area Factor
5.3.12 Pressure-Preservative Treatment
5.4 Special Design Considerations
5.4.1 Radial Stress
5.4.2 Lateral Stability for Glued Laminated Timber
47 5.4.3 Deflection
5.4.4 Notches
48 6 ROUND TIMBER POLES AND PILES
49 6.1 General
6.1.1 Application
6.1.2 Specifications
6.1.3 Standard Sizes
6.1.4 Preservative Treatment
6.2 Design Values
6.2.1 Tabulated Value
6.2.2 Other Species or Grades
6.3 Adjustment of Design Values
6.3.1 Applicability of Adjustment Factors
6.3.2 Load Duration Factor
51 6.3.3 Wet Service Factor
6.3.4 Temperature Factor
6.3.5 Untreated Factor
6.3.6 Beam Stability Factor
6.3.7 Size Factor
6.3.8 Form Factor
6.3.9 Column Stability Factor
6.3.10 Critical Section Factor
6.3.11 Bearing Area Factor
6.3.12 Single Pile Factor
54 7 PREFABRICATED WOOD I- JOISTS
55 7.1 General
7.1.1 Application
7.1.2 Definition
7.1.3 Identification
7.1.4 Service Conditions
7.2 Design Values
7.3 Adjustment of Design Values
7.3.1 General
7.3.2 Load Duration Factor
7.3.3 Wet Service Factor
56 7.3.4 Temperature Factor
7.3.5 Beam Stability Factor
7.3.6 Repetitive Member Factor
7.3.7 Pressure-Preservative Treatment
7.4 Special Design Considerations
7.4.1 Bearing
7.4.2 Load Application
7.4.3 Web Holes
7.4.4 Notches
7.4.5 Deflection
57 7.4.6 Vertical Load Transfer
7.4.7 Shear
58 8 STRUCTURAL COMPOSITE LUMBER
59 8.1 General
8.1.1 Application
8.1.2 Definitions
8.1.3 Identification
8.1.4 Service Conditions
8.2 Design Values
8.3 Adjustment of Design Values
8.3.1 General
60 8.3.2 Load Duration Factor
8.3.3 Wet Service Factor
8.3.4 Temperature Factor
8.3.5 Beam Stability Factor
8.3.6 Volume Factor
8.3.7 Repetitive Member Factor
61 8.3.8 Form Factor
8.3.9 Column Stability Factor
8.3.10 Bearing Area Factor
8.3.11 Pressure-Preservative Treatment
8.4 Special Design Considerations
8.4.1 Notches
62 9 WOOD STRUCTURAL PANELS
63 9.1 General
9.1.1 Application
9.1.2 Identification
9.1.3 Definitions
9.1.4 Service Conditions
9.2 Design Values
9.2.1 Panel Stiffness and Strength
9.2.2 Strength and Elastic Properties
9.2.3 Design Thickness
9.2.4 Design Section Properties
64 9.3 Adjustment of Design Values
9.3.1 General
9.3.2 Load Duration Factor
9.3.3 Wet Service Factor and Temperature Factor
9.3.4 Grade and Construction Factor and Panel Size Factor
9.4 Design Considerations
9.4.1 Flatwise Bending
9.4.2 Tension in the Plane of the Panel
9.4.3 Compression in the Plane of the Panel
65 9.4.4 Planar (Rolling) Shear
9.4.5 Through-the-Thickness Shear
9.4.6 Bearing
66 10 MECHANICAL CONNECTIONS
67 10.1 General
10.1.1 Scope
10.1.2 Stresses in Members at Connections
10.1.3 Eccentric Connections
10.1.4 Mixed Fastener Connections
10.1.5 Connection Fabrication
68 10.2 Design Values
10.2.1 Single Fastener Connections
10.2.2 Multiple Fastener Connections
10.2.3 Design of Metal Parts
10.2.4 Design of Concrete or Masonry Parts
10.3 Adjustment of Design Values
10.3.1 Applicability of Adjustment Factors
10.3.2 Load Duration Factor
69 10.3.3 Wet Service Factor
10.3.4 Temperature Factor
10.3.5 Fire Retardant Treatment
71 10.3.6 Group Action Factor
76 11 DOWEL-TYPE FASTENERS
77 11.1 General
11.1.1 Terminology
11.1.2 Bolts
11.1.3 Lag Screws
11.1.4 Wood Screws
78 11.1.5 Nails and Spikes
11.1.6 Drift Bolts and Drift Pins
11.1.7 Other Dowel-Type Fasteners
79 11.2 Withdrawal Design Values
11.2.1 Lag Screws
80 11.2.2 Wood Screws
11.2.3 Nails and Spikes
11.2.4 Drift Bolts and Drift Pins
82 11.3 Lateral Design Values
11.3.1 Yield Limit Equations
83 11.3.2 Dowel Bearing Strength
11.3.3 Dowel Bearing Strength at an Angle to Grain
11.3.4 Dowel Bearing Length
11.3.5 Dowel Bending Yield Strength
11.3.6 Dowel Diameter
86 11.3.7 Asymmetric Three Member Connections, Double Shear
11.3.8 Multiple Shear Connections
11.3.9 Load at an Angle to Fastener Axis
11.3.10 Drift Bolts and Drift Pins
87 11.4 Combined Lateral and Withdrawal Loads
11.4.1 Lag Screws and Wood Screws
11.4.2 Nails and Spikes
11.5 Adjustment of Design Values
11.5.1 Geometry Factor
89 11.5.2 End Grain Factor
11.5.3 Diaphragm Factor
11.5.4 Toe-Nail Factor
90 11.6 Multiple Fasteners
114 12 SPLIT RING AND SHEAR PLATE CONNECTORS
115 12.1 General
12.1.1 Terminology
12.1.2 Quality of Split Ring and Shear Plate Connectors
116 12.1.3 Fabrication and Assembly
12.2 Design Values
12.2.1 Tabulated Nominal Design Values
12.2.2 Thickness of Wood Members
119 12.2.3 Penetration Depth Factor
12.2.4 Metal Side Plate Factor
12.2.5 Load at Angle to Grain
120 12.2.6 Split Ring and Shear Plate Connectors in End Grain
122 12.3 Placement of Split Ring and Shear Plate Connectors
12.3.1 Terminology
12.3.2 Geometry Factor
12.3.3 Edge Distance
123 12.3.4 End Distance
12.3.5 Spacing
12.3.6 Split Ring and Shear Plate Connectors in End Grain
12.3.7 Multiple Split Ring or Shear Plate Connectors
126 13 TIMBER RIVETS
127 13.1 General
13.1.1 Quality of Rivets and Steel Side Plates
13.1.2 Fabrication and Assembly
13.2 Design Values
13.2.1 Parallel to Grain Loading
128 13.2.2 Perpendicular to Grain Loading
13.2.3 Metal Side Plate Factor
13.2.4 Load at Angle to Grain
13.2.5 Timber Rivets in End Grain
13.2.6 Design of Metal Parts
129 13.3 Placement of Timber Rivets
13.3.1 Spacing Between Rivets
13.3.2 End and Edge Distance
138 14 SHEAR WALLS AND DIAPHRAGMS
139 14.1 General
14.1.1 Application
14.1.2 Definitions
14.1.3 Framing Members
14.1.4 Fasteners
14.1.5 Sheathing
14.2 Design Principles
14.3 Shear Walls
14.3.1 Definitions
14.3.2 Shear Wall Anchorage
14.3.3 Shear Force
140 14.3.4 Shear Resistance
14.3.5 Shear Wall Deflection
14.4 Diaphragms
14.4.1 Definitions
14.4.2 Shear Force
14.4.3 Shear Resistance
14.4.4 Diaphragm Deflection
142 15 SPECIAL LOADING CONDITIONS
143 15.1 Lateral Distribution of a Concentrated Load
15.1.1 Lateral Distribution of a Concentrated Load for Moment
15.1.2 Lateral Distribution of a Concentrated Load for Shear
15.2 Spaced Columns
15.2.1 General
144 15.2.2 Spacer and End Block Provisions
15.2.3 Column Stability Factor
145 15.3 Built-Up Columns
15.3.1 General
15.3.2 Column Stability Factor
146 15.3.3 Nailed Built-up Columns
147 15.3.4 Bolted Built-up Columns
148 15.4 Wood Columns With Side Loads and Eccentricity
15.4.1 General Equations
149 15.4.2 Columns With Side Brackets
150 16 FIRE DESIGN OF WOOD MEMBERS
151 16.1 General
16.2 Design Procedures for Exposed Wood Members
16.2.1 Char Rate
16.2.2 Member Strength
152 16.2.3 Design of Members
16.2.4 Special Provisions for Glued Laminated Timber Beams
16.2.5 Provisions for Timber Decks
16.3 Wood Connections
154 A APPENDIX
155 Appendix A (Non-mandatory) Construction and Design Practices
A.1 Care of Material
A.2 Foundations
A.3 Structural Design
A.4 Drainage
A.5 Camber
A.6 Erection
A.7 Inspection
A.8 Maintenance
A.9 Wood Column Bracing
156 A.10 Truss Bracing
A.11 Lateral Support of Arches, Compression Chords of Trusses and Studs
157 Appendix B (Non-mandatory) Load Duration
B.1 Adjustment of Design Values for Load Duration
B.2 Combinations of Loads of Different Durations
158 B.3 Mechanical Connections
B.4 Load Combination Reduction Factors
159 Appendix C (Non-mandatory) Temperature Effects
C.1
C.2
C.3
160 Appendix D ( Non- mandatory) Lateral Stability of Beams
D.1
D.2
D.3
D.4
D.5
161 Appendix E (Non-mandatory) Local Stresses in Fastener Groups
E.1 General
E.2 Net Section Tension Capacity
E.3 Row Tear-Out Capacity
162 E.4 Group Tear-Out Capacity
E.5 Effects of Fastener Placement
E.6 Sample Solution of Staggered Bolts
163 E.7 Sample Solution of Row of Bolts
164 E.8 Sample Solution of Row of Split Rings
165 Appendix F (Non-mandatory) Design for Creep and Critical Deflection Applications
F.1 Creep
F.2. Variation in Modulus of Elasticity
F.3 Shear Deflection
167 Appendix G (Non-mandatory) Effective Column Length
G.1
G.2
G.3
G.4
168 Appendix H (Non-mandatory) Lateral Stability of Columns
H.1
H.2
H.3
H.4
H.5
H.6
169 Appendix I (Non-mandatory) Yield Limit Equations for Connections
I.1 Yield Modes
I.2 Dowel Bearing Strength for Steel Members
I.3 Dowel Bearing Strength for Wood Members
I.4 Fastener Bending Yield Strength
I.5 Threaded Fasteners
172 Appendix J (Non-mandatory) Solution of Hankinson Formula
J.1
J.2
J.3
J.4
J.5
175 Appendix K (Non-mandatory) Typical Dimensions for Split Ring and Shear Plate Connectors
176 Appendix L Typical Dimensions
Typical Dimensions for Standard Hex Bolts
177 Typical Dimensions for Standard Hex Lag Screws1 ( Cont.)
178 Typical Dimensions for Standard Wood Screws1 ( Cont.)
179 Typical Dimensions for Standard Common, Box and Sinker Nails1 ( Cont.)
180 Appendix M (Non-mandatory) Manufacturing Tolerances for Rivets and Steel Side Plates for Timber Rivet Connections
Rivet Dimensions
Steel Side Plate Dimensions
182 REFERENCES

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AWC NDS 2001
$27.08