Mid-Rise Timber Buildings - mtc.com.my · PDF file•Undertaking required fire testing of...
Transcript of Mid-Rise Timber Buildings - mtc.com.my · PDF file•Undertaking required fire testing of...
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Mid-Rise Timber Buildings
2nd MTC International Conference on Wood Architecture 9 November 2017
Boris Iskra Forest & Wood Products Australia
National Manager – Codes & Standards
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Introduction
Mid-rise Timber Buildings Presenter:
Boris Iskra BE (Civil), Grad Dip. Building Fire Safety & Risk Engineering
Has worked in the timber industry for 30 years in a range of roles including Technical Director at the Timber Promotion Council (Vic). Currently the National Manager – Codes & Standards for Forest & Wood Products Australia.
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Introduction
Speaker involved with:
• Development of the Proposal-for-Change (PFC) for Mid-rise Timber Buildings
• Stakeholder engagement to understand areas of concern and to address these during the PFC development phase
• Running of the fire risk-based model assessments for Class 2, 3 and 5 Buildings
• Undertaking required fire testing of building elements to support the PFC and use of timber products
• Development of educational resources
• Delivery of stakeholder workshops/seminars
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NCC 2016 – Proposal for Change: Timber Construction
Prior to NCC 2016, timber construction systems in Australia have been restricted to 3 storeys under the ‘Deemed-to-Satisfy’ (DTS) provisions with higher buildings requiring an ‘Alternative Solution’ pathway for compliance purposes.
Project: Forte Living Location: Docklands, Melbourne
Project :: Ruskin St Townhouses Architect :: Marcus O’Reilly Architect Location :: Elwood, VIC Photographer :: Dianna Snape
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tuga
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Cana
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Aus
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Denm
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Italy
USA
Ger
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Slove
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Franc
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Iceland
Belgium
Gre
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Ireland
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Norw
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No Sprinklers With Sprinklers
Maximum Storey Height for Timber DTS Buildings - 2013
NCC 2016 – Proposal for Change: Timber Construction
Globally however, many countries now allow construction of timber systems
well above 3 storeys.
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0
5
10
15
20
25
Hung
ary
Por
tuga
l
Polan
d
Switz
erland
Slova
kia
Finland
Aus
tralia
Japa
n
Rom
ania
Cze
ch R
ep
Cana
da
Aus
tria
Denm
ark
Italy
USA
Ger
man
yUK
Slove
nia
Franc
e
Iceland
Belgium
Gre
ece
Ireland
Neth
erland
s
New
Zea
land
Norw
ay
Spa
in
Swed
en
Nu
mb
er
of
Sto
reys
No Sprinklers With Sprinklers
Maximum Storey Height for Timber DTS Buildings - 2016
NCC 2016 – Proposal for Change: Timber Construction
Globally however, many countries now allow construction of timber systems
well above 3 storeys.
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NCC 2016 – Proposal for Change: Timber Construction
To assist in bringing Australia in line with international practices Forest & Wood Products Australia (FWPA) has undertaken a detailed fire testing program and in Feb 2015 submitted a
Proposal for Change (PFC) to the ABCB seeking the modification to the National Construction Code, Building Code of Australia Volume 1 (NCC), DTS provisions to allow the use of
fire-protected timber construction systems.
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NCC 2016 – New Timber Construction Provisions
The 2016 NCC, has been amended to now allow under the Deemed-to-Satisfy (DTS) provisions the use of fire-protected timber construction systems in
Class 2 (apartments),
Class 3 (e.g. hotels) and
Class 5 (offices) buildings
up to 25 metres in effective height
(herein termed ‘mid-rise construction’).
Mid-rise
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2016 NCC Compliance Pathways
Two pathways are available under the NCC to demonstrate performance
Image of new WS Design Guide
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Rise in
storey
Type of Construction
Class 2 Class 3 Class 5 Class 6 Class 9a Class 9b
Apartments Hotels Office Shops Healthcare Schools &
public
buildings
4 or more
A A A A A A
3 A A B B A A
2 B B C C B B
1 C C C C C C
Maximum Timber Storey Height by Building Classification (NCC 2015)
Low-rise
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Maximum Timber Storey Height by Building Classification (NCC 2016)
Mid-rise
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Major New Opportunity
• O
Apartments (Class 2) eg Hotels (Class 3) Office Buildings (Class 5)
• A major new opportunity for a wide range of timber products and systems
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Overview of Proposal for Change
The proposal:
• Building effective height of not more than 25m.
• Protected by automatic fire sprinklers complying with Specification E1.5 of the BCA.
• Fire-Protected Timber used in applications where the BCA DTS requires the element to be of non-combustible construction or concrete or masonry.
• Cavity barriers specified for timber framed construction to address risk of fire spread via cavities.
• No reductions in FRLs proposed despite provision of automatic fire sprinklers.
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New DTS Provisions
• The new DTS provisions cover both
• traditional ‘lightweight timber framing’ and
• new ‘massive timber systems’ such as cross laminated timber (CLT)
Lightweight timber framing
CLT
Fire resistant plasterboard
and consist of the use of appropriate layers of fire resistant plasterboard – to provide ‘fire- protected timber’ – and the use of compliant automatic sprinkler systems.
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Fire-Protected Timber
General Timber (High level of protection to timber)
• FRL lightweight timber-framed
construction e.g. 90, 120, 140 x 45mm
• Additional precautions to reduce risk of fire spread to cavities e.g. Sprinkler system plus 2 x 13mm fire-
grade plasterboard for walls, 2 x 16mm fire-grade plasterboard for ceilings
• Additional precautions to reduce risk if fire enters or starts in cavity
e.g. cavity barriers
Fire-grade plasterboard
Timber framing
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Fire-Protected Timber
Massive Timber (Lower level of protection to timber)
• Minimum 75mm thickness of massive timber element, with required FRL, with no concealed spaces between plasterboard coverings and timber
e.g. CLT, Glulam, LVL • Precautions to reduce risk of timber
ignition e.g. Sprinkler system plus 1 x 16mm fire-
grade plasterboard for walls, 1 x 16mm fire-grade plasterboard for ceilings
• High inherent fire resistance of massive timber
• Comparable to minimum definition in US for heavy timber
Fire -grade plasterboard
Massive timber
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Summary of General Fire Design Principles
Mid-Rise Timber Buildings have a number of critical layers of fire protection
Secondly, the use of fire-protected timber Protects timber in the low probability event that the sprinklers fail
Thirdly, the use of cavity barriers to prevent fire or smoke spread through the cavities if the fire-protection is breached or cavity fire occurs
Firstly, the use of automatic fire sprinklers to suppress a fire before the timber structure is threatened
Fourthly, the use of non-combustible insulation to minimise fire spread in cavities if the fire-protection is breached or cavity fire occurs
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Timber Construction Options for
Mid-rise Timber Buildings
Design of Mid-Rise Timber Buildings
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Building Form – Class 2 or 3: Multi-residential or Hotels
Class 2 – Apartments and Class 3 – e.g. Hotels tend to be honeycombed type structures with many closely spaced walls. There are a number of ways these could be constructed
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Building Form – Class 2 or 3: Multi-residential or Hotels
Multi-Res Apartments
6 – 8 Storeys
Lightweight Timber
+
Massive Timber
Multi-Res Apartments
1-6 Storeys
Lightweight Timber
Conventional framing upper walls closer stud
centres lower walls
Multi-Res Apartments
6 - 12 Storeys
Massive Timber
(CLT)
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Massive Wood Panel Systems
Massive Panel Construction (min. 75mm thickness)
• LVL • Cross Laminated Timber • Glued/nail Laminated Timber
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Typical Construction Approaches - Apartments
Podium level • Often concrete (certainly
basement)
Apartment floors • Lightweight timber systems • Massive timber systems, or • Combination
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Building Form – Class 5 Offices
Heavy Timber
Post & Beam
(Glulam)
Portal Frames
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Efficiencies & Cost Benefits of Timber Systems
• Direct savings from faster methods of construction compared to traditional steel and concrete structures due to both: • increased scope for off-site prefabrication • lighter and more easily manipulated and installed materials
• Reduced foundation requirements due to lighter above-ground structure;
• Reduced on-site costs & OH&S issues, particularly with a shift to more prefabricated solutions;
• Increased ability to commence follow-on trades earlier in the construction process, reducing the overall construction program time to completion;
• Reduced on-site construction infrastructure (preliminary costs) such as fixed cranes, site accommodation, storage areas, scaffolding and edge protection, hoists and so on ; and
• Increased accessibility of the construction site and far lower impacts on noise and site activities on local neighbourhoods (less truck movements & workers); a major benefit for suburban multi-residential developments.
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WS Design Guide: Costing Case Studies
See costing case study guides available from woodsolutions.com.au web site
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Research
Test Program
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Demonstration of performance of Fire Protected Timber
Approx. dimensions 4 m x 4 m x 2.4 m. Opening of 2 m width x 1.2 m height. Fire Load 740 MJ/m2 enclosures
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Fire resistant wall construction
Timber Construction
2 layers of 13mm fire-grade plasterboard
timber studs
combustible insulation
Control
2 layers of 13mm fire-grade plasterboard
steel studs
non-combustible insulation
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30 minutes
Control test Timber framed test
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Enclosure Temperatures
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Protected Steel Column Temperatures
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Average Temperature Non-Fire Side of Walls
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Fire Resistance Level (FRL)
FRL means the grading periods in minutes determined in accordance with Specification A2.3, for the following criteria— (a) structural adequacy; and (b) integrity; and (c) insulation,
and expressed in that order.
NCC Part A1.1 Definitions
Integrity – ability of an element of construction to resist the passage of flames and hot gases from one space to another
Structural adequacy – ability of a loadbearing element to support an applied load
Insulation – ability of the surface of an element of construction, on the non-fire side of the element, to maintain a temperature below the specified limits
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FRL 90/90/90 RISF 60 lightweight engineered timber floor system being prepared for test
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Ceiling System 2 x 16mm fire grade plasterboard fixed to furring channels. Channel spacing 600mm
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Non-fire side 2 minutes after end of 90 minute test
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Fire Exposed Face after test
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Timber Buildings
Australian Case Studies
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Project :: The Green Builders :: Frasers Property (prev. Australand)
Location :: Parkville, Vic
Design Team IrwinConsult TimberTruss & SmartStruct Timber Systems TecBeam Floor Cassette & Prefabricated Wall Frames Build Period Floor System – 1.5 Days per Level Wall System – 5.0 Days per Level
The Green
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Project :: Forté Living Builders :: Lend Lease Location :: Melbourne, Vic
807 Bourke St Victoria Harbour 10 storeys 23 apartments 4 townhouses
Forté
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The Gardens
Architect :: Strongbuild
Engineer :: AECOM
Builder :: Strongbuild
Height :: 6, 7 & 8 storey CLT
Location :: Macarthur Gardens, NSW
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International House Sydney
Architect :: Tzannes Architects
Engineer :: Lend Lease
Builder :: Lend Lease
Height :: 7 storey office building
Location :: Barangaroo, Sydney
Image Credits: Jonathan Evans Image Credits: Jonathan Evans
Image Credits: Dijana Tasevska Image Credits: Dijana Tasevska
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www.woodsolutions.com.a
u
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Available for free by registering at:
www.woodsolutions.com.au
Thank-you
WoodSolutions™: Design Guides