Standard
Track updates
AS 1720.3:2016
[Current]Timber structures, Part 3: Design criteria for timber-framed residential buildings
Sets out the design methods, assumptions and other criteria, including uplift forces and racking pressures, suitable for the design of timber-framed buildings constructed within the limitations and parameters of, and using the building practice described in, AS 1684.2, AS 1684.3 and AS 1684.4.
Published: 29/06/2016
Pages: 110
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application
1.2 Referenced documents
1.3 Other methods
1.4 Basis for design
1.4.1 General
1.4.2 Geometric limitations
1.4.3 Design methods
1.4.3.1 General
1.4.3.2 Capacity factor
1.4.4 System-based assumptions
1.4.5 Durability
1.4.6 Structural timber
1.4.7 Design properties
1.4.8 Bearing and crushing
1.4.9 Structural design actions
1.4.9.1 Permanent (dead load)
1.4.9.2 Imposed (live load)
1.4.9.3 Wind
1.4.9.4 Snow
1.4.9.5 Earthquake
1.4.9.6 Combinations of actions
1.4.10 Strength limit states
1.4.11 Serviceability limit states
1.5 Definitions
1.6 Notation
2 Design of roof members
2.1 Roof battens
2.1.1 Description
2.1.2 Design for safety
2.1.2.1 General consideration
2.1.2.2 Design actions
2.1.2.3 Structural models and action categories for strength design
2.1.2.4 Member design capacity
2.1.3 Design for serviceability
2.1.3.1 Design actions
2.1.3.2 Structural models and action categories for serviceability design
2.1.3.3 Calculation of deflection
2.1.3.4 Serviceability limits
2.2 Rafters
2.2.1 Description
2.2.2 Design for safety
2.2.2.1 General consideration
2.2.2.2 Design actions
2.2.2.3 Structural models and action categories for strength design
2.2.2.4 Member design capacity
2.2.3 Design for serviceability
2.2.3.1 Design actions
2.2.3.2 Structural models and action categories for serviceability design
2.2.3.3 Calculation of deflection
2.2.3.4 Serviceability limits
2.3 Roof beams—Ridge or intermediate beams
2.3.1 Description
2.3.2 Design for safety
2.3.2.1 General consideration
2.3.2.2 Design actions
2.3.2.3 Structural models and action categories for strength design
2.3.2.4 Member design capacity
2.3.3 Design for serviceability
2.3.3.1 Design actions
2.3.3.2 Structural models and action categories for serviceability design
2.3.3.3 Calculation of deflection
2.3.3.4 Serviceability limits
2.4 Underpurlins
2.4.1 Description
2.4.2 Design for safety
2.4.2.1 General consideration
2.4.2.2 Design actions
2.4.2.3 Structural models and action categories used for strength design
2.4.2.4 Member design capacity
2.4.3 Design for serviceability
2.4.3.1 Design actions
2.4.3.2 Structural models and action categories for serviceability design
2.4.3.3 Calculation of deflection
2.4.3.4 Serviceability limits
2.5 Strutting beams
2.5.1 Description
2.5.2 Design for safety
2.5.2.1 General consideration
2.5.2.2 Design actions
2.5.2.3 Structural models and action categories for strength design
2.5.2.4 Member design capacity
2.5.3 Design for serviceability
2.5.3.1 Design actions
2.5.3.2 Structural models and action categories for serviceability design
2.5.3.3 Calculation of deflection
2.5.3.4 Serviceability limits
2.6 Counter strutting beams
2.6.1 Description
2.6.2 Design for safety
2.6.2.1 General consideration
2.6.2.2 Design actions
2.6.2.3 Structural models and action categories for strength design
2.6.2.4 Member design capacity
2.6.3 Design for serviceability
2.6.3.1 Design actions
2.6.3.2 Structural models and action categories for serviceability design
2.6.3.3 Calculation of deflection
2.6.3.4 Serviceability limits
2.7 Combined hanging strutting beams
2.7.1 Description
2.7.2 Design for safety
2.7.2.1 General consideration
2.7.2.2 Design actions
2.7.2.3 Structural models and action categories for strength design
2.7.2.4 Member design capacity
2.7.3 Design for serviceability
2.7.3.1 Design actions
2.7.3.2 Structural models and action categories for serviceability design
2.7.3.3 Calculation of deflection
2.7.3.4 Serviceability limits
2.8 Ceiling battens
2.8.1 Description
2.8.2 Design for safety
2.8.2.1 General consideration
2.8.2.2 Design actions
2.8.2.3 Structural models and action categories for strength design
2.8.2.4 Member design capacity
2.8.3 Design for serviceability
2.8.3.1 Design actions
2.8.3.2 Structural model for serviceability design
2.8.3.3 Calculation of deflection
2.8.3.4 Serviceability limit
2.9 Ceiling joists
2.9.1 Description
2.9.2 Design for safety
2.9.2.1 General consideration
2.9.2.2 Design actions
2.9.2.3 Structural models and action categories for strength design
2.9.2.4 Member design capacity
2.9.3 Design for serviceability
2.9.3.1 Design actions
2.9.3.2 Structural model for serviceability design
2.9.3.3 Calculation of deflection
2.9.3.4 Serviceability limits
2.10 Hanging beams
2.10.1 Description
2.10.2 Design for safety
2.10.2.1 General consideration
2.10.2.2 Design actions
2.10.2.3 Structural models and action categories for strength design
2.10.2.4 Member design capacity
2.10.3 Design for serviceability
2.10.3.1 Design actions
2.10.3.2 Structural models and action categories for serviceability design
2.10.3.3 Calculation of deflection
2.10.3.4 Serviceability limits
2.11 Counter beams
2.11.1 Description
2.11.2 Design for safety
2.11.2.1 General consideration
2.11.2.2 Design actions
2.11.2.3 Structural models and action categories for strength design
2.11.2.4 Member design capacity
2.11.3 Design for serviceability
2.11.3.1 Design actions
2.11.3.2 Structural models and action categories for serviceability design
2.11.3.3 Calculation of deflection
2.11.3.4 Serviceability limits
2.12 Verandah beams
2.12.1 Description
2.12.2 Design for safety
2.12.2.1 General consideration
2.12.2.2 Design actions
2.12.2.3 Structural models and action categories used for strength design
2.12.2.4 Member design capacity
2.12.3 Design for serviceability
2.12.3.1 Design actions
2.12.3.2 Structural models and action categories for serviceability design
2.12.3.3 Calculation of deflection
2.12.3.4 Serviceability limits
3 Design of wall members
3.1 Posts
3.1.1 Description
3.1.2 Design for safety
3.1.2.1 General consideration
3.1.2.2 Design actions
3.1.2.3 Structural models and action categories for strength design
3.1.2.4 Member design capacity
3.1.3 Design for serviceability
3.2 Loadbearing wall studs
3.2.1 Description
3.2.2 Design for safety
3.2.2.1 General consideration
3.2.2.2 Design actions
3.2.2.3 Structural models and action categories for strength design
3.2.2.4 Member design capacity
3.2.3 Design for serviceability
3.2.3.1 General consideration
3.2.3.2 Design actions
3.2.3.3 Structural model for serviceability design
3.2.3.4 Calculation of deflection
3.2.3.5 Serviceability limit
3.3 Wall plates for loadbearing walls
3.3.1 Description
3.3.2 Design for safety
3.3.2.1 General consideration
3.3.2.2 Design actions
3.3.2.3 Structural models and action categories used for strength design
3.3.2.4 Member design capacity
3.3.3 Design for serviceability
3.3.3.1 Design actions
3.3.3.2 Structural model and action categories for serviceability design
3.3.3.3 Calculation of deflection
3.3.3.4 Serviceability limits
3.4 Lintels
3.4.1 Description
3.4.2 Design for safety
3.4.2.1 General consideration
3.4.2.2 Design actions
3.4.2.3 Structural models, design actions and action categories
3.4.2.4 Design action effects in bending and shear
3.4.2.5 Member design capacity
3.4.3 Design for serviceability
3.4.3.1 Design actions
3.4.3.2 Structural models and action categories for serviceability design
3.4.3.3 Calculation of deflection
3.4.3.4 Serviceability limits
3.5 Wind beams
3.5.1 Description
3.5.2 Design for safety
3.5.2.1 General consideration
3.5.2.2 Design actions
3.5.2.3 Structural models and action categories for strength design
3.5.2.4 Member design capacity
3.5.3 Design for serviceability
3.5.3.1 General consideration
3.5.3.2 Design actions
3.5.3.3 Structural model for serviceability design
3.5.3.4 Calculation of deflection
3.5.3.5 Serviceability limit
4 Design of floor members
4.1 Floor joists
4.1.1 Description
4.1.2 Design for safety
4.1.2.1 General consideration
4.1.2.2 Design actions
4.1.2.3 Structural models and action categories for strength
4.1.2.4 Member design capacity
4.1.3 Design for serviceability
4.1.3.1 General consideration
4.1.3.2 Design actions
4.1.3.3 Structural models and action categories for serviceability design
4.1.3.4 Calculation of deflection
4.1.3.5 Serviceability limits
4.2 Bearers
4.2.1 Description
4.2.2 Design for safety
4.2.2.1 General consideration
4.2.2.2 Design actions
4.2.2.3 Structural models and action categories for strength
4.2.2.4 Member design capacity
4.2.3 Design for serviceability
4.2.3.1 Design actions
4.2.3.2 Structural models and action categories for serviceability design
4.2.3.3 Calculation of deflection
4.2.3.4 Serviceability limits
5 Determination of uplift forces
5.1 Scope and general
5.1.1 Scope of Section
5.1.2 General
5.2 Determination of net uplift pressures
5.2.1 Roof uplift
5.2.2 Net uplift pressures at bottom plate or subfloor level
6 Pressures for determination of racking forces
6.1 Scope and general
6.1.1 Scope of Section
6.1.2 Notation
6.1.3 Assumptions
6.2 Equivalent pressures on projected areas
6.2.1 For flat wall surfaces, gable or skillion roof ends
6.2.2 For side elevations, single or upper storey, gable or hip-ended roofs
6.2.3 Side elevation, lower storey of two storeys or subfloor, gable or hip-ended roof
6.2.4 End elevation, single or upper storey, hip-ended roof
6.2.5 End elevation, lower storey of two storeys, hip-ended roof
Appendix A
A1 Wind classifications
A2 Design wind pressures
Appendix B
B1 General
B2 Effect of birdsmouth notch on rigidity
B3 Load sharing for parallel rafter overhangs
B4 Rafter strength at birdsmouth notch
B4.1 Bending strength
B4.2 Shear strength at birdsmouth notch
B4.3 Combined bending and shear (fracture strength) at the birdsmouth notch
Cited references in this standard
[Current]
Residential timber-framed construction, Part 4: Simplified - Non-Cyclonic Areas
Content history
[Superseded]
[Available Superseded]
DR AS 1720.3:2015
One-time Purchase
Access via web browser on any device
One-time purchase
Single publication
Offline access via PDF^
$262.48 AUD
Inclusive of GSTFormat *
Web Reader
Licenses *
1 user
Total$262.48 AUD
IMPORTANT