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AS 1720.1-1997 timber structures - design methods

Standard Number:  AS 1720.1-1997
Title:  timber structures - design methods
Language:  English
Publication Date:  1997/11/5
Status:  AvailableW
International Classification for Standards (ICS)CONSTRUCTION MATERIALS AND BUILDING>>Structures of buildings>>Timber structures
Publisher:  Australia Standards(AS)
Price:  
Number of Pages:177P.;A4  

Description:Sets out the limit state design methods to be used in the design or appraisal of structural elements comprised of timber or wood products and of structures comprised substantially of timber. Design data is provided for sawn timber, glued laminated timber  
Catalog:Document Contents
AS 1720.1-1997 TIMBER STRUCTURES - DESIGN METHODS
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE AND APPLICATION
1.1.1 Scope
1.1.2 Application
1.2 REFERENCED DOCUMENTS
1.3 NEW MATERIALS AND METHODS
1.4 TIMBER
1.4.1 General
1.4.2 Identification
1.4.3 Change of grade
1.4.4 Special provisions
1.4.5 Treated timber
1.5 GENERAL DESIGN CONSIDERATIONS
1.5.1 Loads
1.5.2 Design methods
1.5.3 Timber dimensions for engineering calculations
1.5.4 Other design considerations
1.6 DESIGN AND SUPERVISION
1.6.1 Design
1.6.2 Design information
1.6.3 Design details
1.6.4 Supervision
1.7 WORKMANSHIP AND MAINTENANCE
1.7.1 General
1.7.2 Moisture content
1.7.3 Corrosion
1.7.4 Shop drawings
1.7.5 Fabrication and erection
1.7.6 Maintenance
1.8 DEFINITIONS
1.8.1 Administrative definitions
1.8.2 Technical definitions
1.9 NOTATION
1.10 UNITS
SECTION 2 DESIGN PROPERTIES OF STRUCTURAL TIMBER ELEMENTS
2.1 GENERAL
2.1.1 General procedure
2.1.2 Member design capacity
2.1.3 Member stiffness
2.2 DESIGN PROPERTIES
2.2.1 General
2.2.2 Properties
2.3 CAPACITY FACTOR
2.4 MODIFICATION FACTORS
2.4.1 Duration of load
2.4.2 Moisture condition
2.4.3 Temperature
2.4.4 Length and position of bearing
2.4.5 Strength sharing between parallel members
2.4.6 Size factor
2.4.7 Stability factor
SECTION 3 DESIGN CAPACITY OF BASIC STRUCTURAL MEMBERS
3.1 GENERAL
3.2 BEAM DESIGN
3.2.1 Bending strength
3.2.2 Effective span
3.2.3 Slenderness coefficient for lateral buckling under bending
3.2.4 Stability factor
3.2.5 Flexural shear strength
3.2.6 Bearing strength
3.2.7 Strength of notched beams
3.2.8 Concentrated loads and partial area loads on grid systems
3.3 COLUMN DESIGN
3.3.1 Compressive strength
3.3.2 Slenderness coefficient for lateral buckling under compression
3.3.3 Stability factor
3.3.4 Strength of notched columns
3.3.5 Spaced columns
3.4 TENSION MEMBER DESIGN
3.4.1 Design tensile capacity parallel to grain
3.4.2 Notched tension members
3.5 DESIGN CAPACITY IN TENSION PERPENDICULAR TO GRAIN
3.6 COMBINED BENDING AND AXIAL ACTIONS
3.6.1 Combined bending and compression
3.6.2 Combined bending and tension
SECTION 4 DESIGN CAPACITY OF JOINTS IN TIMBER STRUCTURES
4.1 GENERAL
4.1.1 Scope of Section
4.1.2 Joint groups
4.1.3 Joint types
4.1.4 Timber grade
4.1.5 Tendency to split
4.1.6 Eccentric joints
4.2 DESIGN OF NAILED JOINTS
4.2.1 General
4.2.2 Characteristic capacities for nails
4.2.3 Design capacity for nailed joints
4.2.4 Spacing, edge and end distances
4.2.5 Nail length and timber thickness
4.2.6 Avoidance of splitting
4.3 DESIGN OF SCREWED JOINTS
4.3.1 General
4.3.2 Characteristic capacities for screws
4.3.3 Design capacity of screwed joints
4.3.4 Spacing, edge and end distances
4.3.5 Screw length and timber thickness
4.3.6 Preboring
4.4 DESIGN OF BOLTED JOINTS
4.4.1 General
4.4.2 Characteristic capacities for bolts
4.4.3 Design capacity for bolted connections
4.4.4 Bolt spacings, edge and end distances
4.4.5 Washers
4.4.6 Eccentric joints
4.5 DESIGN OF COACH SCREWED JOINTS
4.5.1 General
4.5.2 Characteristic capacities for coach screws
4.5.3 Design capacity of coach screwed joints
4.6 DESIGN OF SPLIT-RING FASTENER JOINTS
4.6.1 General
4.6.2 Characteristic capacities for split-ring fasteners
4.6.3 Design capacity for split-ring fastener joints
4.6.4 Spacings, edge and end distances for split-ring fasteners
4.7 DESIGN OF SHEAR-PLATE FASTENER JOINTS
4.7.1 General
4.7.2 Characteristic capacities for shear-plate fasteners
4.7.3 Design capacity for joints with shear plates
4.7.4 Spacings, edge and end distances for shear-plate fasteners
SECTION 5 PLYWOOD
5.1 GENERAL
5.2 DESIGN PROPERTIES
5.2.1 Characteristic strengths and elastic moduli
5.2.2 Capacity factor
5.3 MODIFICATION FACTORS
5.3.1 General
5.3.2 Duration of load
5.3.3 Moisture condition
5.3.4 Temperature
5.3.5 Plywood assembly factor
5.4 LOADING NORMAL TO THE PLANE OF THE PLYWOOD PANEL
5.4.1 General
5.4.2 Bending strength
5.4.3 Shear strength (interlamina shear)
5.4.4 Bearing strength
5.4.5 Deflection in bending
5.5 LOADING IN THE PLANE OF THE PLYWOOD PANEL
5.5.1 General
5.5.2 Bending strength
5.5.3 Shear strength
5.5.4 Tension strength
5.5.5 Compression strength
5.5.6 Combined loads
5.5.7 Deflection in bending
5.5.8 Shear deformation
5.6 JOINTS IN COMPOSITE PLYWOOD TO TIMBER CONSTRUCTION
5.6.1 Nailed and screwed joints
5.6.2 Shear strength at glued interfaces
SECTION 6 ROUND TIMBERS
6.1 GENERAL
6.2 CHARACTERISTIC STRENGTHS AND ELASTIC MODULI
6.3 DESIGN
6.3.1 Bending strength
6.3.2 Shear strength
6.3.3 Compressive strength
6.3.4 Deflections
6.4 ADDITIONAL MODIFICATION FACTORS
6.4.1 Factor for immaturity
6.4.2 Shaving factor
6.5 DESIGN DETAILS
6.5.1 Effective cross°section of untreated timber
6.5.2 Moisture content of timbers in ground contact
6.5.3 Joints
SECTION 7 GLUED-LAMINATED TIMBER CONSTRUCTION
7.1 GENERAL
7.2 DESIGN
7.3 DESIGN PROPERTIES
7.3.1 Characteristic strengths and elastic moduli
7.3.2 Capacity factor
7.3.3 Non-GL-grade properties
7.4 MODIFICATION FACTORS
7.4.1 General
7.4.2 Duration of load
7.4.3 Strength sharing between parallel members
7.4.4 Size factor
7.4.5 Stability factor
SECTION 8 STRUCTURAL LAMINATED VENEER LUMBER
8.1 GENERAL
8.2 DESIGN
8.3 PROPERTIES
8.3.1 Characteristic strengths and elastic moduli
8.3.2 Modulus of rigidity
8.3.3 Section properties
8.3.4 Capacity factors
8.4 MODIFICATION FACTORS
8.4.1 General
8.4.2 Duration of load
8.4.3 Moisture condition
8.4.4 Temperature
8.4.5 Length and position of bearing
8.4.6 Strength sharing between parallel members
8.4.7 Size factor
8.4.8 Stability factor
8.5 JOINT DESIGN
8.5.1 General
8.5.2 Joint group
8.5.3 Characteristic fastener capacities
APPENDIX A - REFERENCED DOCUMENTS
APPENDIX B - GUIDELINES FOR SERVICEABILITY
B1 GENERAL
B2 SERVICEABILITY CONSIDERATIONS
APPENDIX C - JOINTS IN TIMBER STRUCTURES
C1 GENERAL
C2 FASTENERS FOR PLYWOOD
C2.1 General
C2.2 Strength of joints with plywood
C3 DEFORMATION OF JOINTS
C3.1 General
C3.2 Displacement of nailed and screwed joints in solid timber
C3.3 Displacement of solid timber joints fabricated with bolts, split°rings and shear pla...
C4 EQUATIONS AND TABLES FOR CHARACTERISTIC CAPACITIES FOR BOLTS
C4.1 Load Qkl
C4.2 Load Qkp
APPENDIX D - ACCEPTANCE TESTING OF TIMBER STRUCTURES AND ELEMENTS
D1 GENERAL
D1.1 Limitations of acceptance testing
D1.2 Circumstances requiring tests
D1.3 Information required
D2 DEFINITIONS
D2.1 Prototype testing
D2.2 Proof testing
D3 METHOD OF TESTING
D3.1 General
D3.2 Test load
D3.3 Eccentricities
D3.4 Load°deflection curve
D4 PROOF TESTING
D4.1 Equivalent test load
D4.2 Loading
D4.3 Acceptance for strength
D4.4 Acceptance of deflection
D5 PROTOTYPE TESTING
D5.1 General
D5.2 Materials
D5.3 Manufacture
D5.4 Equivalent test load
D5.5 Test procedure
D5.6 Acceptance of prototype
D6 REPORT OF TESTS
APPENDIX E - FURTHER DESIGN METHODS FOR MEMBERS
E1 SCOPE
E2 THE MATERIAL CONSTANT
E3 SLENDERNESS COEFFICIENTS FOR COLUMNS
E3.1 End supported columns
E3.2 Continuously restrained columns
E4 SPACED COLUMNS
E4.1 Geometry of spaced columns
E4.2 Special requirements for spaced columns
E4.3 Shear between components
E4.4 Design capacity
E5 BEAM-COLUMN BENT ABOUT BOTH AXES
E6 SLENDERNESS COEFFICIENTS FOR BEAMS
E6.1 General
E6.2 End°supported beams
E6.3 Beams with no intermediate buckling restraints but with torsional restraints at the ...
E6.4 Continuously restrained beams
E7 BUCKLING RESTRAINTS
E7.1 Effectiveness of buckling restraints
E7.2 Notation
E7.3 Columns
E7.4 Beam with lateral restraints
E7.5 Beam with torsional restraints
E8 CONCENTRATED LOADS AND PARTIAL AREA LOADS ON GRID SYSTEMS
E8.1 General
E8.2 Concentrated load
E8.3 Partial area load
E9 NOTCHED BEAMS
E10 NOTCHED COLUMNS
E11 NOTCHED TENSION MEMBERS
E12 SINGLE-TAPERED STRAIGHT BEAMS
E12.1 Geometry
E12.2 Design bending capacity of single-tapered beams
E12.3 Critical section for bending
E12.4 Grain orientation modification factor ktg
E12.5 Taper angle factor ktb
E13 DOUBLE-TAPERED, CURVED AND PITCHED-CAMBERED BEAMS
E13.1 Geometry
E13.2 Double-tapered, curved and pitched-cambered beams
APPENDIX F - NOTATION AND FACTORS
APPENDIX G - DESIGN PROPERTIES OF STRUCTURAL TIMBER
G1 ADDITIONAL INFORMATION
G2 EXAMPLES OF LOAD DURATION FACTORS FOR TYPICAL LOAD COMBINATIONS
APPENDIX H - DESIGN WITH IN-GRADE TESTED MATERIAL
H1 GENERAL
H2 MGP GRADES
H2.1 General
H2.2 Material requirements
H2.3 Design procedures
H2.4 Design properties
H2.5 Capacity factors
H2.6 Modification factors
H2.7 Structural design
H3 A17 STRESS GRADE
H3.1 General
H3.2 Material requirements
H3.3 Design procedures
H3.4 Design properties
H3.5 Capacity factors
H3.6 Modification factors
H3.7 Structural design
APPENDIX I - ASSIGNMENT OF CAPACITY FACTOR (?) TO DESIGN PROPERTIES
I1 GENERAL
I2 BASIS FOR ASSIGNMENT OF CAPACITY FACTOR
I2.1 General
?I2.2 Capacity factor (?)
I3 STRUCTURAL TIMBER BASED PRODUCTS
I3.1 Australian Standards
I3.2 Manufacturers? specifications
APPENDIX J - BUCKLING STRENGTH OF PLYWOOD DIAPHRAGMS
J1 SCOPE
J2 BUCKLING STRENGTH FOR DIAPHRAGMS LOADED IN°PLANE
J2.1 Application
J2.2 Diaphragms with lateral edges supported and subjected to uniformly loaded edge forces
J2.3 Diaphragms with lateral edges free and subjected to uniformly loaded edge forces
J2.4 Diaphragms subjected to concentrated edge forces
J2.5 Stiffeners for beam webs
J3 METHOD OF CALCULATION OF SECTION PROPERTIES
J3.1 General
J3.2 Definitions for use in calculation of section properties
J3.3 Calculation method
J4 SECTION PROPERTIES FOR STANDARD CONSTRUCTIONS
  
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