clt mtb seminar_presentation_seven

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

Construction Site Fire Safety

www.expan.com.au

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