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AS/NZS 1170.2:2002

[Available Superseded]

Structural design actions, Part 2: 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.
Published: 04/06/2002
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Table of contents
Cited references
Content history
Table of contents
About this publication
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
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 Forces derived from wind pressure Forces derived from frictional drag Forces derived from force coefficients
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
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)
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)
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 (Kℓ) for cladding
5.4.5 Permeable cladding reduction factor (Kp) for roofs and side walls
5.5 Frictional drag forces for enclosed buildings
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 Equivalent static wind force Crosswind base overturning moment Crosswind force spectrum coefficient (Cfs)
6.3.3 Crosswind response of chimneys, masts and poles of circular cross-section Crosswind tip deflection Equivalent static wind force
6.4 Combination of along-wind and crosswind response
Appendix A
Appendix B
Appendix C
C1 Additional pressure coefficients
C2 Multi-span buildings, (α < 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
C5.2.1 Walls
C5.2.2 Roofs and lids
C5.2.3 Internal pressures in bins, silos and tanks
Appendix D
D1 General
D1.1 Application
D1.2 Area reduction factor (Ka)
D1.3 Local net pressure factor (Kℓ)
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
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
E4.2.1 Tower sections without ancillaries
E4.2.2 Tower sections with ancillaries
E4.2.3 Correction factor for interference
Appendix F
F1 General
F2 Flags
F3 Circular shapes
Appendix G
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
Cited references in this standard
Methods of testing sheet roof and wall cladding, Method 3: Resistance to wind pressures for cyclone regions
Structural design actions, Part 0: General principles
General principles on reliability for structures
Wind actions on structures
Content history
[Available Superseded]