Download - Clt mtb seminar_presentation_seven
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Fire ResistanceConsiderations
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Maximum storey height for timber dts complying buildings
AustraliaNumber of storeys without sprinklers
Storey Max floor area (m2)
Single family Unlimited UnlimitedMulti Residential 3 UnlimitedOffice 2 8,000Retail 2 5,000Industrial 2 18,000Public (Assembly) 1 8,000
Number of storeys without sprinklers
Single family Unlimited UnlimitedMulti Residential 3 UnlimitedOffice 2 UnlimitedRetail 2 5,000Industrial 2 18,000Public (Assembly) 1 Unlimited
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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
Max Storey Height by Building Classification
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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
Max Storey Height by Building Classification
Current PFC for NCC 2014
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How does Australia Compare with the rest of Worldwide
Unlimited storey height
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What limits timber construction in “dts” Building Regs – Fire
• Type A & B dts requirements do not directly limit timber construction for
o Beams,
o Columns, and
o Floors (other than lift pits)
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What limits timber construction in “dts” Building Regs – Fire
• Type A & B dts requirements do limit timber construction by requiring
– External walls, and non-load bearing internal walls required to be fire resisting to be non-combustible construction
– Load bearing internal walls are to be constructed from concrete or masonry
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What limits timber construction in “dts” Building Regs – Fire
• Spec C1.1 Clause 2.2 Support for Another Part necessitates if the part it supports is required to be non-combustible, then that element is also required to be non-combustible
• Therefore various walls supported by floor, beams and columns must also be non-combustible
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Fire Resistance Level (FRL)
Full size fire resistance tests ORFire resistance by calculation
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Fire Resistance Criteria
Stability Integrity Insulation
Partition X X
Door X X
Load bearing wall X X X
Floor – ceiling X X X
Beam X
Column X
Fire resistant glazing X
60 / 60 / 60
- / 30 / -
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Fire Protection – Two Methods Method
Wrapped in Plasterboard Exposed timber
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Calculations by AS 1720.4
• Structural Only
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Calculations by AS 1720.4
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Integrity and Insulation
• Shortly an EXPAN design guide will development a method for calculating Integrity and Insulation for floor and wall systems
• Basically it will say that 35 mm away from char layer, timber’s temperature will be at room temperature
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Fire Protection
• Fire protection provided by increased thickness to timber elements
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Chat for FRL 90/90/90
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Fire Protection
• Beam and columns elements needs increased thickness for fire so an extra thickness is placed on exposed faces
Timber fire protection
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Fire Protection
• Shoulder to beam forms perfect corbel for floor cassette to sit on the beam
Timber fire protection
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Construction Fires
First Interstate Bank CA, USA
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WoodSolutions : Design Guides
• These free guides are related to fire design
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WoodSolutions : Design Guides
• These free guides are related to fire engineering and Alternative Solutions