AS/NZS 1170.2:2002
Warning: Superseded Standard. This document has been replaced by:
AS/NZS 1170.2:2011Structural design actions - Wind actions
Provides design values of wind actions for use in structural design. It is intended to be used in conjunction with AS/NZS 1170.0, which gives the procedure for structural design. Wind speeds and direction factors are provided for a range of probabilities of exceedance. Other factors cover the environment around the structure, the geometry of the structure and the dynamic interaction of the structure with the wind.
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AS/NZS 1170.2:2002 STRUCTURAL DESIGN ACTIONS - WIND ACTIONS
Committee BD-006
COPYRIGHT
PREFACE
CONTENTS
SECTION 1 GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DETERMINATION OF WIND ACTIONS
1.5 UNITS
1.6 DEFINITIONS
1.7 NOTATION
SECTION 2 CALCULATION OF WIND ACTIONS
2.1 GENERAL
2.2 SITE WIND SPEED
2.3 DESIGN WIND SPEED
2.4 DESIGN WIND PRESSURE AND DISTRIBUTED FORCES
2.4.1 Design wind pressures
2.4.2 Design wind distributed forces
2.5 WIND ACTIONS
2.5.1 General
2.5.2 Directions to be considered
2.5.3 Forces on surfaces or structural elements
2.5.4 Forces and moments on complete structures
2.5.5 Performance of fatigue-sensitive elements
2.5.6 Serviceability of wind-sensitive structures
SECTION 3 REGIONAL WIND SPEEDS
3.1 GENERAL
3.2 REGIONAL WIND SPEEDS (VR)
3.3 WIND DIRECTION MULTIPLIER (Md)
3.3.1 Regions A and W
3.3.2 Regions B, C and D
3.4 FACTORS FOR REGIONS C AND D (FC, FD)
SECTION 4 SITE EXPOSURE MULTIPLIERS
4.1 GENERAL
4.2 TERRAIN/HEIGHT MULTIPLIER (Mz,cat)
4.2.1 Terrain category definitions
4.2.2 Determination of terrain/height multiplier (Mz,cat)
4.2.3 Changes in terrain category
4.3 SHIELDING MULTIPLIER (Ms)
4.3.1 General
4.3.2 Buildings providing shielding
4.3.3 Shielding parameter (s)
4.4 TOPOGRAPHIC MULTIPLIER (Mt)
4.4.1 General
4.4.2 Hill-shape multiplier (Mh)
4.4.3 Lee multiplier (Mlee)
SECTION 5 AERODYNAMIC SHAPE FACTOR
5.1 GENERAL
5.2 EVALUATION OF AERODYNAMIC SHAPE FACTOR
5.3 INTERNAL PRESSURE FOR ENCLOSED RECTANGULAR BUILDINGS
5.3.1 General
5.3.2 Openings
5.3.3 Dominant openings
5.4 EXTERNAL PRESSURES FOR ENCLOSED RECTANGULAR BUILDINGS
5.4.1 External pressure coefficients (Cp,e)
5.4.2 Area reduction factor (Ka) for roofs and side walls
5.4.3 Combination factor (Kc)
¿5.4.4 Local pressure factor (K¿) for cladding
5.4.5 Permeable cladding reduction factor (Kp) for roofs and side walls
5.5 FRICTIONAL DRAG FORCES FOR ENCLOSED BUILDINGS
SECTION 6 DYNAMIC RESPONSE FACTOR
6.1 EVALUATION OF DYNAMIC RESPONSE FACTOR
6.2 ALONG-WIND RESPONSE OF TALL BUILDINGS AND TOWERS
6.2.1 General
6.2.2 Dynamic response factor (Cdyn)
6.3 CROSSWIND RESPONSE
6.3.1 General
6.3.2 Crosswind response of tall enclosed buildings and towers of rectangular cross-section
6.3.3 Crosswind response of chimneys, masts and poles of circular cross-section
6.4 COMBINATION OF ALONG-WIND AND CROSSWIND RESPONSE
APPENDIX A - DEFINITIONS
APPENDIX B - NOTATION
APPENDIX C - ADDITIONAL PRESSURE COEFFICIENTS FOR ENCLOSED BUILDINGS
C1 ADDITIONAL PRESSURE COEFFICIENTS
C2 MULTI-SPAN BUILDINGS, ( 60°)
C3 BUILDINGS WITH CURVED ROOFS
C4 MANSARD ROOFS
C5 CIRCULAR BINS, SILOS AND TANKS
C5.1 General
C5.2 Isolated circular bins, silos and tanks
APPENDIX D - FREESTANDING WALLS, HOARDINGS AND CANOPIES
D1 GENERAL
D1.1 Application
D1.2 Area reduction factor (Ka)
¿D1.3 Local net pressure factor (K¿)
D1.4 Net porosity factor (Kp)
D2 FREESTANDING HOARDINGS AND WALLS
D2.1 Aerodynamic shape factor for normal net pressure on freestanding hoardings and walls
D2.2 Aerodynamic shape factor for frictional drag
D3 FREE ROOFS AND CANOPIES
D3.1 Aerodynamic shape factor for local net pressure on free roofs
D3.2 Aerodynamic shape factor for frictional drag and drag on exposed members for free roofs
D4 ATTACHED CANOPIES, AWNINGS AND CARPORTS (ROOFS)
D4.1 Aerodynamic shape factor for normal net pressure on attached canopies
D4.2 Aerodynamic shape factor for frictional drag and drag on exposed members of attached canopies
D5 CANTILEVERED ROOFS AND CANOPIES
APPENDIX E - AERODYNAMIC SHAPE FACTORS FOR EXPOSED STRUCTURAL MEMBERS, FRAMES AND LATTICE TOWERS
E1 GENERAL
E2 AERODYNAMIC SHAPE FACTORS FOR INDIVIDUAL MEMBERS AND FRAMES
E2.1 Simple shapes and individual members
E2.2 Open frames in a single plane
E2.3 Multiple open frames
E3 DRAG FACTORS FOR STRUCTURAL MEMBERS AND SIMPLE SECTIONS
E3.1 Rounded cylindrical shapes, sharp-edged prisms and structural sections
E3.2 Rectangular prismatic sections
E4 LATTICE TOWERS
E4.1 General
E4.2 Drag force coefficient
APPENDIX F - FLAGS AND CIRCULAR SHAPES
F1 GENERAL
F2 FLAGS
F3 CIRCULAR SHAPES
APPENDIX G - ACCELERATIONS FOR WIND SENSITIVE STRUCTURES
G1 ACCELERATION FOR SERVICEABILITY
G2 PEAK ALONG-WIND ACCELERATION FOR SERVICEABILITY
G3 CROSSWIND ACCELERATION FOR SERVICEABILITY OF TALL BUILDINGS AND TOWERS OF RECTANGULAR CROSS-SECTION
G3.1 General
G3.2 Peak crosswind acceleration for serviceability
AMENDMENT CONTROL SHEET
Amendments
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In determining what information to consult and how to approach falsework design, no single document provides all the answers. Sources of information for scaffolders, chartered and design engineers include: …AS/NZS 1170 parts 0 - 3 and NZS 1170.5; ...Best Practice Guideline For Scaffolding In New Zealand
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AS/NZS 1170.2:2002 STRUCTURAL DESIGN ACTIONS - WIND ACTIONS
Committee BD-006
COPYRIGHT
PREFACE
CONTENTS
SECTION 1 GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DETERMINATION OF WIND ACTIONS
1.5 UNITS
1.6 DEFINITIONS
1.7 NOTATION
SECTION 2 CALCULATION OF WIND ACTIONS
2.1 GENERAL
2.2 SITE WIND SPEED
2.3 DESIGN WIND SPEED
2.4 DESIGN WIND PRESSURE AND DISTRIBUTED FORCES
2.4.1 Design wind pressures
2.4.2 Design wind distributed forces
2.5 WIND ACTIONS
2.5.1 General
2.5.2 Directions to be considered
2.5.3 Forces on surfaces or structural elements
2.5.4 Forces and moments on complete structures
2.5.5 Performance of fatigue-sensitive elements
2.5.6 Serviceability of wind-sensitive structures
SECTION 3 REGIONAL WIND SPEEDS
3.1 GENERAL
3.2 REGIONAL WIND SPEEDS (VR)
3.3 WIND DIRECTION MULTIPLIER (Md)
3.3.1 Regions A and W
3.3.2 Regions B, C and D
3.4 FACTORS FOR REGIONS C AND D (FC, FD)
SECTION 4 SITE EXPOSURE MULTIPLIERS
4.1 GENERAL
4.2 TERRAIN/HEIGHT MULTIPLIER (Mz,cat)
4.2.1 Terrain category definitions
4.2.2 Determination of terrain/height multiplier (Mz,cat)
4.2.3 Changes in terrain category
4.3 SHIELDING MULTIPLIER (Ms)
4.3.1 General
4.3.2 Buildings providing shielding
4.3.3 Shielding parameter (s)
4.4 TOPOGRAPHIC MULTIPLIER (Mt)
4.4.1 General
4.4.2 Hill-shape multiplier (Mh)
4.4.3 Lee multiplier (Mlee)
SECTION 5 AERODYNAMIC SHAPE FACTOR
5.1 GENERAL
5.2 EVALUATION OF AERODYNAMIC SHAPE FACTOR
5.3 INTERNAL PRESSURE FOR ENCLOSED RECTANGULAR BUILDINGS
5.3.1 General
5.3.2 Openings
5.3.3 Dominant openings
5.4 EXTERNAL PRESSURES FOR ENCLOSED RECTANGULAR BUILDINGS
5.4.1 External pressure coefficients (Cp,e)
5.4.2 Area reduction factor (Ka) for roofs and side walls
5.4.3 Combination factor (Kc)
¿5.4.4 Local pressure factor (K¿) for cladding
5.4.5 Permeable cladding reduction factor (Kp) for roofs and side walls
5.5 FRICTIONAL DRAG FORCES FOR ENCLOSED BUILDINGS
SECTION 6 DYNAMIC RESPONSE FACTOR
6.1 EVALUATION OF DYNAMIC RESPONSE FACTOR
6.2 ALONG-WIND RESPONSE OF TALL BUILDINGS AND TOWERS
6.2.1 General
6.2.2 Dynamic response factor (Cdyn)
6.3 CROSSWIND RESPONSE
6.3.1 General
6.3.2 Crosswind response of tall enclosed buildings and towers of rectangular cross-section
6.3.3 Crosswind response of chimneys, masts and poles of circular cross-section
6.4 COMBINATION OF ALONG-WIND AND CROSSWIND RESPONSE
APPENDIX A - DEFINITIONS
APPENDIX B - NOTATION
APPENDIX C - ADDITIONAL PRESSURE COEFFICIENTS FOR ENCLOSED BUILDINGS
C1 ADDITIONAL PRESSURE COEFFICIENTS
C2 MULTI-SPAN BUILDINGS, ( 60°)
C3 BUILDINGS WITH CURVED ROOFS
C4 MANSARD ROOFS
C5 CIRCULAR BINS, SILOS AND TANKS
C5.1 General
C5.2 Isolated circular bins, silos and tanks
APPENDIX D - FREESTANDING WALLS, HOARDINGS AND CANOPIES
D1 GENERAL
D1.1 Application
D1.2 Area reduction factor (Ka)
¿D1.3 Local net pressure factor (K¿)
D1.4 Net porosity factor (Kp)
D2 FREESTANDING HOARDINGS AND WALLS
D2.1 Aerodynamic shape factor for normal net pressure on freestanding hoardings and walls
D2.2 Aerodynamic shape factor for frictional drag
D3 FREE ROOFS AND CANOPIES
D3.1 Aerodynamic shape factor for local net pressure on free roofs
D3.2 Aerodynamic shape factor for frictional drag and drag on exposed members for free roofs
D4 ATTACHED CANOPIES, AWNINGS AND CARPORTS (ROOFS)
D4.1 Aerodynamic shape factor for normal net pressure on attached canopies
D4.2 Aerodynamic shape factor for frictional drag and drag on exposed members of attached canopies
D5 CANTILEVERED ROOFS AND CANOPIES
APPENDIX E - AERODYNAMIC SHAPE FACTORS FOR EXPOSED STRUCTURAL MEMBERS, FRAMES AND LATTICE TOWERS
E1 GENERAL
E2 AERODYNAMIC SHAPE FACTORS FOR INDIVIDUAL MEMBERS AND FRAMES
E2.1 Simple shapes and individual members
E2.2 Open frames in a single plane
E2.3 Multiple open frames
E3 DRAG FACTORS FOR STRUCTURAL MEMBERS AND SIMPLE SECTIONS
E3.1 Rounded cylindrical shapes, sharp-edged prisms and structural sections
E3.2 Rectangular prismatic sections
E4 LATTICE TOWERS
E4.1 General
E4.2 Drag force coefficient
APPENDIX F - FLAGS AND CIRCULAR SHAPES
F1 GENERAL
F2 FLAGS
F3 CIRCULAR SHAPES
APPENDIX G - ACCELERATIONS FOR WIND SENSITIVE STRUCTURES
G1 ACCELERATION FOR SERVICEABILITY
G2 PEAK ALONG-WIND ACCELERATION FOR SERVICEABILITY
G3 CROSSWIND ACCELERATION FOR SERVICEABILITY OF TALL BUILDINGS AND TOWERS OF RECTANGULAR CROSS-SECTION
G3.1 General
G3.2 Peak crosswind acceleration for serviceability
AMENDMENT CONTROL SHEET