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AS 1720.5:2015
[Current]Timber structures, Part 5: Nailplated timber roof trusses
Sets out requirements for the design of nailplated timber roof trusses for residential and similar building applications in accordance with AS1720.1, AS4055 and the AS(/NZS)1170 series.
Published: 18/08/2015
Pages: 53
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope and general
1.1 Scope
1.2 Application
1.3 Normative references
1.4 Notation
1.5 Definitions
1.6 General requirements
1.7 Basis for design
1.8 Other methods
2 Design considerations
2.1 Performance
2.2 Design methods
2.3 Documentation
2.3.1 Design
2.3.2 Installation
2.3.3 Labelling
2.4 Materials
2.4.1 General
2.4.2 Timber products
2.4.3 Steel products
2.5 Loads
2.5.1 General
2.5.2 Design actions
2.5.3 Design action combinations
3 Design methods
3.1 Structural models
3.2 Critical design action effects
3.3 Capacity factor
3.3.1 General
3.3.2 Application category assessment
3.3.3 Affected area
3.4 Strength limit states
3.4.1 General
3.4.2 Modification factors
3.4.2.1 Load duration factor
3.4.2.2 Moisture content of timber
3.4.2.3 Temperature factor
3.4.2.4 Bearing
3.4.2.5 Strength sharing factor
3.4.2.6 Stability factor
3.4.3 Tension capacity
3.4.4 Birdsmouth overhangs
3.4.5 Lateral restraint
3.4.5.1 Top chords
3.4.5.2 Bottom chords
3.4.6 Stability of members in compression
3.4.6.1 Multiple plies
3.4.6.2 T-stiffeners
3.5 Stability limit states
3.6 Serviceability limit states
3.6.1 General
3.6.2 Camber
3.6.3 Duration of load factor for creep deformation
3.6.4 Birdsmouth overhangs
4 Member design
4.1 General
4.2 Design for safety
4.2.1 Design actions
4.2.1.1 General
4.2.1.2 Standard trusses
4.2.1.3 Girder trusses
4.2.1.4 Truncated trusses
4.2.1.5 Attic trusses
4.2.1.6 Gable end trusses
4.2.1.7 Wind trusses
4.2.2 Design action combinations
4.2.3 Design capacity
4.3 Design for serviceability
4.3.1 Design actions
4.3.2 Calculation of deflection
4.3.3 Serviceability limits
5 Joint design
5.1 General
5.2 Strength limit states
5.2.1 General
5.2.2 Timber design capacity
5.2.2.1 General
5.2.2.2 Timber shear
5.2.2.3 Tension perpendicular to grain
5.2.2.4 Timber tension at joint
5.2.3 Nailplate design
5.2.3.1 General
5.2.3.2 Tooth capacity
5.2.3.3 Steel capacity
5.2.4 Eccentric joints
Appendix A
A1 Generic terms
A2 Typical truss shapes
A3 Key truss types—Function and load descriptions
Appendix B
B1 Bracing and connections
B1.1 Bracing
B1.2 Connections
B2 Erection and handling forces
B3 Secondary stresses
B4 Moisture control in roof spaces
B5 Durability
B6 Exposure to corrosion
B7 Truss installation
Appendix C
C1 Model guidelines
C2 Support models
Appendix D
D1 General
D2 Effect of birdsmouth notch on rigidity
D3 Load sharing for parallel overhangs
D4 Overhang strength at birdsmouth notch
Amendment control sheet
AS 1720.5:2015
Amendment No. 1 (2019)
Correction
Bibliography
Cited references in this standard
[Current]
Structural design actions, Part 0: General principles - Commentary (Supplement to AS/NZS 1170.0:2002)
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