Toronto Wood Solutions Fair 2015 CWC Tools & Publications Kevin Rocchi & Adam Robertson 1 Adam Robertson, M.A.Sc., P.Eng. and Kevin Rocchi, MASc., E.I.T. November 24 th 2015 Toronto, ON CWC Publications, Software & Design Tools Canadian Wood Council G063 CWC Publications, Software and Tools Kevin Rocchi, MASc., E.I.T. Adam Robertson, M.A.Sc., P.Eng. Canadian Wood Council November 24, 2015
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Toronto Wood Solutions Fair 2015 CWC Tools & Publications
Kevin Rocchi & Adam Robertson 1
Adam Robertson, M.A.Sc., P.Eng. and Kevin Rocchi, MASc., E.I.T.
November 24th 2015
Toronto, ON
CWC Publications, Software & Design Tools
Canadian Wood CouncilG063
CWC Publications, Software and Tools
Kevin Rocchi, MASc., E.I.T. Adam Robertson, M.A.Sc., P.Eng.Canadian Wood Council
November 24, 2015
Toronto Wood Solutions Fair 2015 CWC Tools & Publications
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The Canadian Wood Council represents the Canadian wood products industry through a
national federation of Associations:
CWC produces and communicates technical information to architects, engineers, builders, and other specifiers on how to use wood in buildings from structural, fire, durability, and sustainability design perspectives.
www.cwc.ca
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Presentation Outline
1. Publication: Wood Design Manual 2015
2. Publication: Introduction to Wood Design
3. Publication: Permanent Wood Foundations 2016
4. Software: WoodWorks® Design Office
5. Publication: Span Book
6. Publication: Engineering Guide for Wood Frame Construction 2014
•Revise the lateral design chapter in accordance with NBC 2015 & CSA O86-14
•Provide new shearwall and diaphragm selection tables based on CSA O86-14
•Revise design examples in accordance with new seismic design provisions in NBC 2015
•Address mid-rise design (5-6 storey)
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Shearwalls and diaphragms
•~30 pages of shearwall and diaphragm selection tables for different combination of sheathing, studs and nail size and spacing:
• Derived mechanics-based approach• Indicate failure mode; fastener or panel buckling• Indicate appropriateness for wind or seismic design• Includes power driven nails• Address high capacity shearwalls and diaphragms
High-capacity shearwalls and diaphragms
• Midply shearwalls – double shear
Nail in single shear
Nail in doubleshear
Sheathing Stud or
Plate
Grain direction
89 mm
Stud or Plate
38 mm 38 mm ns = 2
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High-capacity shearwalls and diaphragms
• Diaphragms with multiple rows of fasteners
Design for fire safety
Fire resistance of large cross-section wood elements
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Engineering Guide for Wood Frame Construction 2014 Edition
• Updated to conform with NBC 2015 and CSA O86‐14 (Available early 2016)
• Basis of Subsection 9.23.13 of the NBC ‐ Bracing to Resist Lateral Loads Due to Wind and Earthquake
• Referenced in Part 9 of the NBC as an alternative design tool to the prescriptive design for housing and small buildings
• Bridges the Gap between a Part 9 (Prescriptive Design) and Part 4 (Engineered Design)
Engineering Guide for Wood Frame Construction 2014 Edition
Who uses the Engineering Guide?•Architects, Engineers, Contractors and Building Officials who live in areas of Canada which are considered as High Wind or Seismic Zones
Where do High Wind Zones occur in Canada?•5 Locations (NBC 2015)
3 in Newfoundland, 1 in North West Territories, and 1 in Alberta
Where do High Seismic Zones occur in Canada?•50 Locations (NBC 2015)
40 in British Columbia, 7 in Quebec, 2 in Yukon and 1 in New Brunswick
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Engineering Guide for Wood Frame Construction 2014 Edition
Engineering Guide FormatPART A: Forward
‐How to use it?PART B: Design Requirements
‐Equations used in Parts C and DPART C: Supplementary Guidelines on Applicability and Scope
‐Basis of 9.23.13 of NBCPART D: Supplementary Tables
‐Tables to Develop loads and Design Components
Engineering Guide for Wood Frame Construction 2014 Edition
Why have there been Changes to Part C of the Engineering Guide?•Updated procedure in Part 4 of the NBC 2015 for calculating seismic loads
Increase in total base shear for small buildings less than 3 stories
•Updated seismic climatic data in NBC 2015A number of locations (Including Victoria, BC), would no longer be allowed to be designed following Part 9
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Engineering Guide for Wood Frame Construction 2014 Edition
Braced Wall Framing Details: Typical Wall Sheathing Connection in the NBC 2010 and Engineering Guide 2009:• 3/8” thick sheathing (9.5 mm)• 2 ¼” long nail (2.84 mm dia, 57
mm long)• 6 inch panel edge spacing (150
mm)• 12 inch panel interior spacing
(300 mm)• unblocked wall
Engineering Guide for Wood Frame Construction 2014 Edition
Updated Braced Wall Panel Construction Details Table
Sa(0.2) =0.249 (Toronto in NBC 2015)
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Engineering Guide for Wood Frame Construction 2014 Edition
Updated Braced Wall Panel Construction Details Table
Engineering Guide for Wood Frame Construction 2014 Edition
Example using Part D of the Guide
How Many Nails?
Snow LoadRidge Plate (Not a Beam) –Does not Resist vertical Load
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Engineering Guide for Wood Frame Construction 2014 Edition
Engineering Guide for Wood Frame Construction 2014 Edition
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Engineering Guide for Wood Frame Construction 2014 Edition
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Wall Thermal Design Calculator
www.cwc.caDesign Tools Wall Thermal Design
www.cwc.ca/wtd
Wall Thermal Design Calculator
What’s the Purpose of the Wall Thermal Design Calculator?
To provide designers with climate‐zone appropriate insulated wall assembly solutions:•easily comparable with prescriptive energy efficiency requirements (NECB, NBC, Provincial)
•with a climate specific durability assessment
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Wall Thermal Design Calculator
Nominal vs Effective R‐values
Nominal R‐value:
Installed R‐value of the insulation components only, as labelled on the product.
Example: R19/20 batts
R19 batt (wood studs)
R20 batt (metal studs)
Effective R‐value:
R‐value including the contribution of framing members (spacing and material type)
National Energy Requirements (Wall Effective R values):
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SB‐12
Nominal insulation R 22 to 27
Ontario Zone 1 Ontario Zone 2
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• www.cwc.ca Design Tools Carbon Calculator
Online Carbon CalculatorsFor Wood Buildings
Carbon Estimator – Generic Analysis
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Carbon Estimator – Generic Analysis
Online Carbon CalculatorsFor Wood Buildings
• www.cwc.ca Design Tools Carbon Calculator
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Carbon Calculator – Detailed Analysis
(ESSB, Vancouver – Perkins + Will)
Carbon Calculator – Detailed Analysis
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Carbon Calculator – Detailed Analysis
Carbon Calculator – Detailed Analysis
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Carbon Calculator – Detailed Analysis
Siding & Roofing species:Western Red Cedar/Eastern White Cedar
Carbon Calculator – Detailed Analysis
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• 400,000 board feet of FSC‐certified glulam (2010 FSC award winner)• Torrefied aspen for exterior ceilings & façade accents• Design inspired by IPCC report recommending the use of wood building products
instead of concrete or steel to mitigate climate change effects
GHA Architecture et Developpement
• 6‐storey office building• Performance‐based
alternative solution• 60,000 ft2 of floor area
Carbon Case Study – Fondaction, QC
• Originally conceived as a concrete structure – put on hold due to cost
• Redesigned in wood after 2009 BCBC changes allowed for 6‐storey wood‐frame construction