2018 NDS Changes. National Design Specification for Wood Construction (STD120)
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1 2018 NDS Changes National Design Specification for Wood Construction (STD120) John Buddy Showalter, P.E. Vice President, Technology Transfer American Wood Council
2 13847IP The American Wood Council is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider # Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-aia members are available upon request. Participants may download the presentation here: This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation N D S C h a n g e s S T D
3 COURSE DESCRIPTION This presentation will provide an overview of the significant changes for wood design per AWC's National Design Specification (NDS) for Wood Construction. The 2018 NDS is referenced in the 2018 International Building Code and 2018 International Residential Code and used to design wood structures worldwide. The 2018 NDS references ASCE/SEI Standard 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures which includes increased wind loads. Participants will learn about changes in the 2018 NDS to address increased wind loads and gain an overview of the standard N D S C h a n g e s S T D
4 LEARNING OBJECTIVES Upon completion, participants will be better able to identify: 1 NDS Changes 3 Identify changes in the 2018 NDS Fasteners Identify new fastener provisions developed to address increased wind loads 2 ASCE Identify wind load increases in ASCE 7-16 that affect wood design and construction Nail Design Design nails for withdrawal and head pullthrough to resist new wind loads N D S C h a n g e s S T D
5 NDS HISTORY N D S C h a n g e s S T D
6 ANSI ACCREDITATION AWC ANSI-accredited standards developer Consensus Body Wood Design Standards Committee N D S C h a n g e s S T D
7 GOVERNING CODES FOR WOOD DESIGN 2018 NDS referenced in 2018 IBC and IRC N D S C h a n g e s S T D
8 2018 NDS PRIMARY CHANGES References ASCE 7-16 Added equation for withdrawal design values for smooth shank stainless steel nails New provisions for Roof Sheathing Ring Shank nails in accordance with ASTM F 1667 New design provisions for fastener head pullthrough Revision to method for calculating lateral design values for threaded nails Revised timber rivet design value tables Revised terminology for Fire Design of Wood Members NDS Supplement design values updated N D S C h a n g e s S T D
9 NDS 2018 CHAPTERS 1. General Requirements for Structural Design 2. Design Values for Structural Members 3. Design Provisions and Equations 4. Sawn Lumber 5. Structural Glued Laminated Timber 6. Round Timber Poles and Piles* 7. Prefabricated Wood I-Joists* 8. Structural Composite Lumber 9. Wood Structural Panels* 10. Cross-Laminated Timber 11. Mechanical Connections 12. Dowel-Type Fasteners 13. Split Ring and Shear Plate Connectors* 14. Timber Rivets 15. Special Loading Conditions* 16. Fire Design of Wood Members * No changes N D S C h a n g e s S T D
10 NDS 2018 APPENDICES A. Construction and Design Practices B. Load Duration (ASD Only) C. Temperature Effects D. Lateral Stability of Beams E. Local Stresses in Fastener Groups F. Design for Creep and Critical Deflection Applications G. Effective Column Length H. Lateral Stability of Columns I. Yield Limit Equations for Connections J. Solution of Hankinson Equation K. Typical Dimensions for Split Ring and Shear Plate Connectors L. Typical Dimensions for Dowel-Type Fasteners and Washers M. Manufacturing Tolerances for Rivets and Steel Side Plates for Timber Rivet Connections N. Appendix for Load and Resistance Factor Design (LRFD) Mandatory N D S C h a n g e s S T D
11 NDS 2018 SUPPLEMENT 1. Sawn Lumber Grading Agencies 2. Species Combinations 3. Section Properties 4. Reference Design Values Sawn Lumber and Timber MSR and MEL Decking Non-North American Sawn Lumber Structural Glued Laminated Timber Timber Poles and Piles N D S C h a n g e s S T D
12 CHAPTER N D S C h a n g e s S T D
13 MINIMUM DESIGN LOADS Reference Loads Minimum Load Standards ASCE N D S C h a n g e s S T D
14 NOTATION 1.6 Notation D H = fastener head diameter, in. EI eff = effective bending stiffness of the CLT section, lbs-in. 2 /ft of panel width GA eff = effective shear stiffness of the CLT section, lbs/ft of panel width W H, W H ' = reference and adjusted pull-through design value, lbs a char = effective char depth, in a eff = effective char depth, in. t ns = net side member thickness, in. b t b eff = non-linear effective char rate (in./hr ) adjusted for exposure time, t N D S C h a n g e s S T D
15 CHAPTER N D S C h a n g e s S T D
16 RESPONSIBILITY OF DESIGNER N D S C h a n g e s S T D
17 LOAD DURATION FACTOR N D S C h a n g e s S T D
18 CHAPTER N D S C h a n g e s S T D
19 BEAM STABILITY FACTOR Beam Stability Factor, C L Source: APA N D S C h a n g e s S T D
20 CHAPTER N D S C h a n g e s S T D
21 FLAT USE FACTOR x y y x N D S C h a n g e s S T D
22 INCISING FACTOR Incising Factor, C i Dimensional lumber - Allowance for incising factors from company providing incising N D S C h a n g e s S T D
23 WOOD TRUSSES N D S C h a n g e s S T D
24 CHAPTER N D S C h a n g e s S T D Source: APA 24
25 ADJUSTMENT FACTORS Source: APA N D S C h a n g e s S T D
26 CHAPTER 6 NO CHANGE N D S C h a n g e s S T D
27 CHAPTER 7 NO CHANGE N D S C h a n g e s S T D Source: APA
28 CHAPTER 8 Source: APA N D S C h a n g e s S T D
29 VOLUME FACTOR Volume Factor C v Tension parallel to grain N D S C h a n g e s S T D
30 CHAPTER 9 NO CHANGE Source: APA N D S C h a n g e s S T D
31 CHAPTER 10 Source: Seagate N D S C h a n g e s S T D
32 FORMAT CONVERSION FACTOR Format Conversion Factor N D S C h a n g e s S T D
33 DEFLECTION EFFECTIVE SHEAR STIFFNESS Per ANSI/APA PRG Source: APA N D S C h a n g e s S T D
34 CHAPTER 11 Roof Sheathing Ring Shank Nails Option to address significant increases in ASCE 7-16 C&C roof wind pressures N D S C h a n g e s S T D
35 ADJUSTMENT FACTORS HEAD PULL-THROUGH N D S C h a n g e s S T D
36 WET SERVICE FACTORS HEAD PULL-THROUGH N D S C h a n g e s S T D
37 CHAPTER N D S C h a n g e s S T D
38 TYPICAL NAIL HEADS Photos courtesy Falcon Fasteners ASTM F1667 ESR N D S C h a n g e s S T D Photos courtesy of Hitachi Falcon - Hitachi 38
39 TYPICAL NAIL SHANKS Photos courtesy of Falcon Fasteners N D S C h a n g e s S T D Sketches courtesy ISANTA
40 ROOF SHEATHING RING SHANK NAILS N D S C h a n g e s S T D
41 SMOOTH SHANK NAILS OR SPIKES N D S C h a n g e s S T D
42 CARBON STEEL NAIL WITHDRAWAL N D S C h a n g e s S T D
43 STAINLESS STEEL NAIL WITHDRAWAL NEW N D S C h a n g e s S T D
44 Pounds per inch of penetration SMOOTH SHANK NAIL WITHDRAWAL STRENGTH 45 ASD Withdrawal Strength (Smooth shank, 8d common nail) Wood specific gravity Carbon steel (bright or galvanized) Stainless steel N D S C h a n g e s S T D
45 DEFORMED SHANK NAILS N D S C h a n g e s S T D
46 RSRS NAIL WITHDRAWAL N D S C h a n g e s S T D
47 FASTENER HEAD PULL -THROUGH N D S C h a n g e s S T D
48 FASTENER HEAD PULL -THROUGH NEW N D S C h a n g e s S T D
49 FASTENER UPLIFT CAPACITY Fastener Uplift Capacity = lesser of W and W H N D S C h a n g e s S T D
50 FASTENER UPLIFT DESIGN EXAMPLE Fastener Uplift Capacity - Roof Sheathing Ring Shank Nail 7/16 OSB RSRS 2x N D S C h a n g e s S T D
51 FASTENER UPLIFT DESIGN EXAMPLE Fastener Uplift Capacity - Roof Sheathing Ring Shank Nail (cont.) N D S C h a n g e s S T D
52 FASTENER UPLIFT DESIGN EXAMPLE Fastener Uplift Capacity - Roof Sheathing Ring Shank Nail (cont.) N D S C h a n g e s S T D
53 FASTENER UPLIFT DESIGN EXAMPLE Fastener Uplift Capacity - Roof Sheathing Ring Shank Nail (cont.) Fastener head pull-through of 67 lbs is less than withdrawal capacity of 88 lbs and controls design capacity. See NDS Table for application of additional adjustment factors for connections based on end use conditions N D S C h a n g e s S T D
54 FASTENER UPLIFT CAPACITY 2018 WFCM Table N D S C h a n g e s S T D
55 ASCE 7-16 WIND LOAD CHANGES Figure B Basic Wind Speeds for Risk Category II Buildings and Other Structures N D S C h a n g e s S T D
56 ASCE 7 WIND LOAD CHANGES C&C Loads Increase in hurricane regions Larger roof zones Interior roof zones increase most N D S C h a n g e s S T D
57 ASCE 7 WIND LOAD CHANGES C&C Roof Coefficients Ratio of ASCE 7-16/ASCE 7-10 Roof Slope Roof GC p - GC pi Roof Overhang GC p - GC pi 3r 3e 2r 2n 2e 1 3r 3e 2r 2n 2e 1 7 < Θ < Θ < Θ N D S C h a n g e s S T D
58 FASTENER UPLIFT CAPACITY COMPARISONS 110mph Exposure B, 7/16" WSP, Framing G = 0.42, Rafter spacing = 24 For lower wind speed zones and lower G framing, RSRS gives simpler nailing schedule option Nail Type Perimeter Nailing (Zones 2 & 3) Interior Nailing (Zone 1) RSRS 6/12 6/12 8d Common 6/6 6/ N D S C h a n g e s S T D
59 FASTENER UPLIFT CAPACITY COMPARISONS 180mph Exposure B, 19/32" WSP, Framing G = 0.55, Rafter spacing = 24 Assume complex roof where separating perimeter and interior zones is difficult RSRS nails with 19/32" WSP allow 6/6 nailing everywhere simple For higher wind speeds and higher G framing, RSRS provides beneficial options Nail Type Perimeter Nailing Interior Nailing RSRS 6/6 6/12 8d Common 4/4 6/ N D S C h a n g e s S T D
60 DOWEL DIAMETER Post-Frame Ring Shank N D S C h a n g e s S T D Roof Sheathing Ring Shank 60
61 RSRS NAIL LATERAL VALUES N D S C h a n g e s S T D
62 RSRS NAIL LATERAL VALUES N D S C h a n g e s S T D
63 POST FRAME RING SHANK LATERAL VALUES REVISED N D S C h a n g e s S T D
64 POST FRAME RING SHANK LATERAL VALUES REVISED N D S C h a n g e s S T D
65 CHAPTER 13 NO CHANGE N D S C h a n g e s S T D
66 CHAPTER N D S C h a n g e s S T D
67 WOOD CAPACITY PARALLEL -TO-GRAIN Limits max distance perp-to-grain between outermost rivet rows to N D S C h a n g e s S T D
68 WOOD CAPACITY PERPENDICULAR -TO-GRAIN Limits rivets per row N D S C h a n g e s S T D
69 CHAPTER 15 NO CHANGE N D S C h a n g e s S T D
70 CHAPTER N D S C h a n g e s S T D
71 CHAR RATE N D S C h a n g e s S T D
72 CHAR DEPTH Structural Fire Design N D S C h a n g e s S T D
73 CONNECTIONS N D S C h a n g e s S T D Photo courtesy of Softwood Lumber Board 73
74 APPENDIX L N D S C h a n g e s S T D
75 APPENDIX L NEW N D S C h a n g e s S T D
76 NDS 2018 SUPPLEMENT New and revised grades of MSR & MEL Redwood grades requiring close grain, removed Addition of Norway Spruce (from Norway) to foreign species dimension lumber Addition of shear-free moduli of elasticity for structural glulam N D S C h a n g e s S T D
77 MORE INFO??? N D S C h a n g e s S T D
78 This concludes the American Institute of Architects Continuing Education Systems Course T h i s p r e s e n t a t i o n i s p r o t e c t e d b y U S a n d I n t e r n a t i o n a l C o p y r i g h t l a w s. R e p r o d u c t i o n, d i s t r i b u t i o n, d i s p l a y a n d u s e o f t h e p r e s e n t a t i o n w i t h o u t w r i t t e n p e r m i s s i o n o f A m e r i c a n W o o d C o u n c i l ( A W C ) i s p r o h i b i t e d. A m e r i c a n W o o d C o u n c i l
79 In-Person Seminars Education Resources Monthly Webinars Recorded Presentations CEUs Available N D S C h a n g e s S T D
80 Free to Qualified Officials Free Standard Code Official Connections Pubs Discounts WoodPost Newsletter WoodWorks Software N D S C h a n g e s S T D
81 Free to Qualified Officials Fire Safety Manuals Links & Resources Webinars Checklists & Guidance Documents Quarterly Newsletters N D S C h a n g e s S T D
82 CODE CONFORMING WOOD DESIGN (CCWD) Allowable building size Special occupancies Fire resistance Building features Wood in noncombustible construction types Structural considerations Precautions during construction N D S C h a n g e s S T D Free Download
83 WOOD JOIST AND RAFTER SPAN CALCULATOR Simple spans (no cantilever) Uniform loads Wet service conditions Incising factor Free at Apps free N D S C h a n g e s S T D
84 CONNECTION CALCULATOR Apps free N D S C h a n g e s S T D
85 HEIGHTS & AREAS CALCULATOR 2 Analysis Modes Basic Advanced Apps free N D S C h a n g e s S T D
86 ENERGY UA CALCULATOR N D S C h a n g e s S T D
87 AWC FIELD STAFF N D S C h a n g e s S T D
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