tall wood - ghl consultants ltd.ghl.ca/.../tall_wood_presentation_(boabc_nov_2013).pdf · this...
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What Building Officials Need to Know
A copy of this presentation is available at: http://www.ghl.ca/shared/Tall_Wood _Presentation (BOABC Nov 2013).pdf
Andrew Harmsworth, MEng, PEng, CP Email: [email protected] Tim Ryce – City of North Vancouver Web: www.ghl.ca
Tall Wood The Next 20 Years, The Next 20 Storeys
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GHL takes no responsibility for application of any concepts or interpretations in this presentation to specific projects unless specifically retained for that project.
This presentation is conceptual and intended to be presented by GHL.
These slides must not be considered complete or exhaustive. This presentation is copyright GHL Consultants Ltd and others and all rights are reserved.
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Copyrights and Limitations
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Andrew Harmsworth, M Eng, P Eng, CP
Principal, GHL Consultants Ltd Email: [email protected]
BASc, Queen’s University at Kingston, Civil Engineering
M Eng, UBC’s short lived Fire Science program
25 years’ experience in Equivalencies and Alternative Solutions
Who Am I?
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GHL Consultants Ltd
Founded 20 years ago
Building Code Consultants
Fire Engineers
Code reviews – both assisting clients and as Authorities
No system design – won’t sell you things you don’t need
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About GHL “Code Consulting” firm Prefer “Fire Engineering”
• Focus on Part 3 • Fire hazard analysis • Fire risk analysis • Structural fire resistance • Heat transfer • Smoke control design
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GHL Staff
6 Engineers – 4 with Master’s Degrees in Fire Science
1 Architect
2 former Building Officials
3 BCQ qualified Technologists (Qualified as Building Officials)
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Building Code Committee Work
APEG Building Codes Committee (Khash Vorell / Andrew Harmsworth)
BC Appeal Board (Frankie Victor)
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Research Work BC Wood First Advisory Committee to Forestry
Investment Innovations CAN 086 Task Group on Fire (Andrew Harmsworth) NEWBuildS Research Network (Andrew Harmsworth,
Board of Directors) – 40 Master’s and PhD Students Fire Risk Assessment for Alternative Solutions (Gary
Chen) Effectiveness of Sprinkler Systems after an Earthquake.
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Research Work
6 Storey Group C (Residential) – Code Change (Andrew Harmsworth / Gary Chen, 2009)
Group D (Office) Studies – 6 Storey Frame and 8 Storey Heavy Timber (HT)
MSc Studies on Effects of Fire as a Structural Load (Gary Chen) - Current
Lead Author, Tall Wood Guide with FP Innovations
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6 Storey Wood - 1871
Wikipedia 10
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9 Storey Heavy Timber - 1905
Kelly Douglas Building, Vancouver 11
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Today
Wikipedia 12
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We Used to Know How to Do It
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What Happened Greater concern with fire safety.
National Building Code of 1941.
Initially prefaces with the idea that it was a ‘Guide’.
Over time it became a restrictive document.
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The Building Code
It is a consensus document: It regulates construction of buildings.
Traditionally written by NRCC (Constitution).
The Province adopts it on the public’s behalf.
Code measures are public interest decisions.
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Risk
Buildings are subject to risks: Code compliance ≠ no risk. Code compliance = risks at acceptable level.
Entering a building is just like getting into a car, there is an acceptable level of risk.
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Codes and Mass Timber
1953…2010 NBCC
1941 NBCC
2010 NBCC
Vancouver
1905 Pre-NBCC
2015 NBCC (Proposed)
Building Code Compliance
Acceptable Solutions Alternative Solutions
Québec City
1941, 2015 NBCC
Courtesy FPInnovations
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History and Background Use of Combustible Construction Up to early 1900’s
• Regulated by insurance industry • 5 and 6 storey wood frame was common • 8 and 9 storey HT common
NBCC 1941, introduced height and area limits NBCC 1965, 3 storey height limit BCBC 1973 (NBCC 1970), 3 storey BCBC 1992 (NBCC 1990), 4 storey BCBC 2006 (April 4, 2009), 6 storey height limit
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Thoughts on Codes
Code should not care what material you use.
All materials and design methods should be required to meet the same performance level.
Code should be based on science, not emotion.
Designers and Owners should be able to choose the best material for the job.
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New Concerns
The Code should not prevent materials and methods that address concerns not addressed by the Code.
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Why Wood?
Greenhouse gas concerns: Steel and concrete production produces large
quantities of CO2.
Wood production produces less CO2.
Wood buildings sequester CO2.
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Environmental Impact of Structural Typologies
Courtesy CWC 22
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2005 – Objective Based
Objective-based Code a fundamental change.
Code provides solutions.
Establishes objectives and functional statements.
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Objective Based Code
Code Compliance
Conforming to Division B
Alternative Solution
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Risk Probability of Failure x Consequence of Failure
Generally with fire: • Probability is very small • Consequence is very large
Approach to address risk includes: • Minimize the probability • Minimize the consequence • Minimize both the probability and the consequence
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Fundamental
Division B is only one solution.
There can be other solutions.
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Level of Performance
Limitation is that you must provide at least the level of performance that the Division B Solution provides.
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BC 6 Storey Residential
GHL prepared the risk analysis. Essentially an ‘Alternative Solution’ that was incorporated in the Code. GHL argued that risks were equivalent to existing allowable building areas and heights if appropriate provisions were made.
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Peer Review and Consultation
GHL’s study on risks Peer Reviewed. Public consultation. Peer review.
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Where Are We Now?
BC Code allows 6 Storey Residential, limited area. Quebec interim changes. NBC 2015 proposed changes to allow 6 storey wood frame published for comment.
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GHL Experience - 6 Storey
Complex, requires good engineering. Design team, Contractor’s qualifications very important. Definitely practical and safe.
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Construction Fires
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35 Laminated 2x6 elevator shaft
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Mass Timber Terminology
Consensus is developing to use the term Mass Timber. (Massive lost out – too late) Avoids confusion with the specified sizes for Heavy Timber in Division B.
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Mass Timber Fire Resistance
Two methods: Encapsulation Char
38
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Tall Wood Guide FPInnovations project funded by NRCan 400 Pages.
70 on Fire Fire Section first to provide comprehensive review of fire issues
in tall wood buildings. Still a lot of work, but a team of authors and reviewers conclude
it can be done. 39
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Approach Chosen Intent was to demonstrate that it CAN BE DONE.
Nationally acceptable Risk Tolerance. Took a conservative approach.
Recommends that an approach of encapsulation of
combustibles: 40
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Possible Approaches - Full Performance based assessment
• Lack of performance criteria / inconsistent benchmarks • Time consuming
Extend permitted combustible construction based on Comparative Risk Analysis • WIDC • BC 6 Storey
Equivalent Component Performance • Protect components for equivalent performance
41
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Encapsulation
42
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Encapsulation
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What is the Difference
44
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Complete Encapsulation Wood not affected by the fire for expected duration.
Wood does not contribute to the fire for expected
duration.
4 layers of ½in GWB.
Makes the point that it CAN BE DONE.
45
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Fire Resistance Rating of Gypsum Board Membranes
46
Gypsum Board Members Fire Resistance Rating
One layer of 12.7mm (½in) GWB 15min
One layer of 15.9mm (⅝in) GWB 30min
Two layers of 12.7mm (½in) GWB 40min
Two layers of 15.9mm (⅝in) GWB 60min
Three layers of 15.9mm (⅝in) GWB 90min
Four layers of 15.9mm (⅝in) GWB 120min
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UK Early Example – Bridport House Fire / Acoustic
CLT Symposium Moncton Philipp Zumbrunn
12 October 2011
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Peel Off the Layers Then, suggested we peel off the layers.
48
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Char Fire Resistance
49
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Char Layer – Small-Scale Flame Test
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Concept of Mass Timber Design for Fire Resistance
52
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Size of Members
Upsize of members for fire. But this refers to critical collapse loads only. Often performance governs (vibration, deflection). Members may not need to increase in size.
53
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What has greater risk?
54
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2h Noncombustible
55
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This, especially if wrapped in 2 layers of GWB
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Comparison
Code refers to comparison of level of performance of the Alternative Solution. Useful to look at an acceptable solution for Earth Sciences Building compared to the proposed solution.
57
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Risk Analysis
Another approach.
UBC Earth Sciences Building.
58
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5 Storey A-2 Occupancy UBC Earth Sciences Building
Acceptable solution for A-2 occupancies: 1h noncombustible construction Alternative solution to address 1h mass timber
59
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Approach
Risk Analysis
Pre-Flashover
Post-Flashover
61
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Pre - Flashover
95% sprinkler reliability. Only necessary to address 5% probability. Low occupant load, extra fire separations.
62
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Peer Reviewed
GHL was the proponent. Gage-Babcock & Associates Ltd was the reviewer. All large UBC buildings done by peer review.
66
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Mass Timber vs Steel Wood Expensive to protect. Highly reliable. Reproducible results. Contributes Fire Load Steel Cheap to protect. How reliable? How reproducible are the results? Burns Out
67
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Concrete
Concrete Agreed generally more fire safe than mass timber. Are fire rating designs and cover still applicable? Is 1/2in of cover acceptable per IBC? Spalling is unpredictable. Concrete – how do you repair it - $30B loss in NZ
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Firefighting Considerations If Sprinklered – no difference from sprinklered nc building Encapsulation == encapsulated steel Performance in the first half hour will be the same as
concrete or steel building of the same design. Evacuation the same. Difference may be cleanup, as mass timber may continue
to burn and char. Difference – If the sprinklers fail, longer cleanup
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Connections
Not specifically addressed for Steel or Concrete Especially intumescent – problems noted
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We Used to Know How to Do It
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73
b) Connection covered with wood paneling
Protected Connections for Enhanced Fire Performance
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74
a) Fire-resistance test conducted on concealed plate (credit: L. Peng (Peng, Hadjisophocleous, Mehaffey, & Mohammad, 2010))
Protected Connections for Enhanced Fire Performance
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Intumescent Paint
Most Tested on Steel Beams – no movement or cracking Effectiveness on connections, steel or wood is not known
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Issues
A few issues that came up worth discussing.
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Performance targets not clear. Why 2h FRR? Why does ULC S101 only require 1 test? Is criteria set by residential 1h compartment rating?
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Sprinkler Reliability To what degree can we rely on sprinklers? Consensus of authors: - On site water supply needed. Addresses – seismic concerns: - Fire after 2h? US data confirms that sprinklers are 90% reliable; Canadian data, if monitored and supervised, reliability is much higher. In my opinion, a fully sprinklered 2h combustible building can meet risk fully exposed, but not politically saleable in most areas.
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Seismic
"An internal report of the City of Vancouver concludes that, at present, an M-7 earthquake would render the Greater Vancouver Water District supply system completely dysfunctional with 1000 water main breaks and 1000 service breaks." (Robertson 2000) Conclusion: - We need an on site water supply
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Design Fire
Is the standard fire acceptable, or do we need to look at real fires? Conclusion: - Office, Residential Occupancies – standard fire is
acceptable. - High hazard, should probably assess real fires.
Note if using reduced load, must use ‘natural fire’.
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Standard Fire vs. Design Fire Scenarios
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Void Spaces
Limited but they will occur. How big a void space is acceptable? Unsprinklered (NFPA 13 provisions applicable). - Sprinklered?
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Approaches to Encapsulation Creating Concealed Spaces
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Mass Timber within Occupied Spaces
Mass Timber typically FSR 40 to 50
Wall and ceiling finishes up to 25 mm in thickness; Floor finishes of any thickness; Solid wood partitions that are not a part of floor to
floor separations or exit separations; Light wood framing in partitions that are not a part of
floor to floor separations or exit separations. 85
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Firestopping
Don’t see a lot of issues. Some public testing being done for WIDC. But, be careful:
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87
CLT Smoke Leakage Paths
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Results to come
88
Fire Tests not so bad
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Exterior Cladding
Unlikely to be fully exposed. Code has a nice performance Standard for this, just needs to be applied to the whole wall assembly.
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90
Cladding
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What Was Accomplished Various reports out there on tall wood. Limited review of fire issues, many said very little. Green/Kharsh/Triggs – some more detail and a lot of effort on detailing to address approach – good first step but needed a lot more detail. First full summary of all the fire issues.
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European Example
8 Storey Residential in London. Eurban / CarbonEng, A Design Build Contractor with CLT. Courtesy of Philipp Zumbrunnen.
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Bridport House CLT Symposium Moncton
Philipp Zumbrunn 12 October 2011
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Bridport House / Facts 7 weeks design period
10 weeks fabrication prior to start on site
12 weeks installation
CLT Panels 1576m3
Steel Elements 1520kg
30 CLT deliveries
CLT Symposium Moncton Philipp Zumbrunn
12 October 2011
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Bridport House / The Installation
Day 40
CLT Symposium Moncton Philipp Zumbrunn 12 October 2011 95
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Developments in Canada NEWBuildS - Network for Engineered Wood-based Building Systems. CAN/CSA O86 Task Group on Wood Fire Ratings. NRC/CWC Research consortium on higher wood buildings. FP Innovations CLT Development. National Code Process.
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NEWBuildS
NEWBuildS - Network for Engineered Wood-Based Building Systems: History of the Code studies
Fire Tests of CLT rooms
Hybrid Construction (Steel/Wood and Concrete/Wood)
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NEWBuildS
NEWBuildS
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NEWBuildS
NEWBuildS
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NEWBuildS
NEWBuildS
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NRC/CWC Research Consortium
Research consortium on higher wood buildings: Looking at 6 storey combustible frame construction.
Learned group similar to Code Committee.
Comparative performance testing (fire and sound).
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NRC/CWC Research Consortium
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NRC/CWC Research Consortium
103
Fire Test Fuel
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NRC/CWC Research Consortium
104 CLT Start of Test
LWF Start of Test
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NRC/CWC Research Consortium
105
LWF Fire Test
CLT Fire Test
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NRC/CWC Research Consortium
106
LWF
CLT
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NRC/CWC Research Consortium
107
Steel
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The Future My opinion: 6 storey is probably the practical limit for wood frame. 8 storey with prefab quality control. No significant limit on area for wood frame. Structures will set limit on height for Heavy Timber. Hybrid buildings of unlimited height and area.
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Wood Construction Courtesy FPInnovations
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Conceptually, How High Can We Go With Wood? Courtesy FPInnovations
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112
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Useful Links • GHL CONSULTANTS LTD: www.ghl.ca
Tall Wood Presentation: http://www.ghl.ca/shared/Tall_Wood _Presentation.pdf
• Woodworks! National: ww.woodworks.org/index.php?option=com_content&view=featured&Itemid=112
• Woodworks! Alberta:
www.wood-works.org/index.php?option=com_sobipro&sid=61:Wood-WORKS-Alberta&Itemid=228 • Woodworks! BC:
www.wood-works.org/index.php?option=com_sobipro&sid=61:Wood-WORKS-Alberta&Itemid=228
• Canadian Wood Council: Mid-Rise Construction in BC: http://www.cwc.ca/documents/case_studies/Mid-Rise-Construction-in-BC.pdf
• 44 • Canadian Wood Council: Innovating with Wood:
http://www.cwc.ca/documents/case_studies/Four%20demonstration%20Case%20Study_May_30.pdf
• Technical Guide for the Design and Construction of Tall Wood Buildings in Canada: http://ghl.ca/shared/Tall_Wood_Building_Technical_Guide.pdf
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Questions?
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