Embed Size (px)
DESCRIPTION
Citation preview
Fire ResistanceConsiderations
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
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
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
How does Australia Compare with the rest of Worldwide
Unlimited storey height
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)
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
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
Fire Resistance Level (FRL)
Full size fire resistance tests ORFire resistance by calculation
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 / -
Fire Protection – Two Methods Method
Wrapped in Plasterboard Exposed timber
Calculations by AS 1720.4
• Structural Only
Calculations by AS 1720.4
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
Fire Protection
• Fire protection provided by increased thickness to timber elements
Chat for FRL 90/90/90
Fire Protection
• Beam and columns elements needs increased thickness for fire so an extra thickness is placed on exposed faces
Timber fire protection
Fire Protection
• Shoulder to beam forms perfect corbel for floor cassette to sit on the beam
Timber fire protection
Construction Fires
First Interstate Bank CA, USA
WoodSolutions : Design Guides
• These free guides are related to fire design
WoodSolutions : Design Guides
• These free guides are related to fire engineering and Alternative Solutions
