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AS/NZS 1170.2 SUPP 1-2002 structural design actions - wind actions - commentary (supplement to as/nzs 1170.2:2002)

Standard Number:  AS/NZS 1170.2 SUPP 1-2002
Title:  structural design actions - wind actions - commentary (supplement to as/nzs 1170.2:2002)
Language:  English
Publication Date:  2002/6/4
Execute Date:  2002/6/4
Status:  Current
Publisher:  Australia Standards(AS)
Price:  
Number of Pages:61P.;A4  

Description:This Commentary is intended to be read in conjunction with AS/NZS 1170.2:2002. The Commentary includes explanations of the provisions and in some cases suggests approaches that may satisfy the intent of the Standard. Commentary Clauses are not mandatory. Lists of references are also given at the end of each Section for further reading. The principles for determining wind actions given in the Standard are generally applicable to wind loads on any structure. The specific data given for the cases outlined (e.g., aerodynamic shape factors) are based on research involving wind tunnel testing, measurements in the field and calculation using established principles of fluid mechanics. They are generally relevant for simplified situations; however, the values derived are applied to real design cases using methods that account for such uncertainties (see also Clause CI.4). The Standard does not attempt to predict the effects of possible future climatic changes, as the evidence for changes in wind speeds is inconclusive. For the effects of tornadoes, wind speeds can be significantly higher than those given in the Standard. The effect of debris is also significant. Such wind events are not covered due to their small nature and low occurrence in populated areas of Australia and New Zealand. Structures that extend over considerable distances, such as powerlines or pipelines, may be affected by tornadoes if the usual path of such events is across the structure. The methods given in the Standard are not sufficient for some structures such as electricity transmission structures, bridges, lattice towers, cranes and similar, as specific details necessary to perform calculations are not given. In these cases, the Standard may be used to determine site wind speeds or design wind speeds, but other Standards should be referenced for detailed factors.  
Catalog:Document Contents
AS/NZS 1170.2 SUPP 1:2002 STRUCTURAL DESIGN ACTIONS-WIND ACTIONS-COMMENTARY(SUPPLEMENT TO...
PREFACE
CONTENTS
SECTION C1 SCOPE AND APPLICATION
C1.1 SCOPE
C1.2 APPLICATION
C1.3 REFERENCED DOCUMENTS
C1.4 DETERMINATION OF WIND ACTIONS
C1.5 UNITS
C1.6 DEFINITIONS
C1.7 NOTATION
SECTION C2 CALCULATION OF WIND ACTIONS
C2.1 GENERAL
C2.2 SITE WIND SPEED
C2.3 DESIGN WIND SPEED
C2.4 DESIGN WIND PRESSURE AND DISTRIBUTED FORCES
C2.4.1 Design wind pressure
C2.4.2 Design wind distributed forces
C2.5 WIND ACTIONS
C2.5.1 General
C2.5.2 Directions to be considered
C2.5.3 Forces on surfaces or structural elements
C2.5.4 Forces and moments on complete structures
C2.5.5 Performance of fatigue-sensitive elements
C2.5.6 Serviceability of wind-sensitive structures
SECTION C3 REGIONAL WIND SPEEDS
C3.1 GENERAL
C3.2 REGIONAL WIND SPEEDS (VR)
C3.3 WIND DIRECTION MULTIPLIER (Md)
C3.3.1 Regions A and W
C3.3.2 Regions B, C and D
C3.4 FACTORS FOR REGIONS C AND D (FC, FD)
SECTION C4 SITE EXPOSURE MULTIPLIERS
C4.1 GENERAL
C4.2 TERRAIN/HEIGHT MULTIPLIER (Mz,cat)
C4.2.1 Terrain category definitions
C4.2.2 Determination of terrain/height multiplier (Mz,cat)
C4.2.3 Changes in terrain category
C4.3 SHIELDING MULTIPLIER (Ms)
C4.3.1 General
C4.3.2 Buildings providing shielding
C4.3.3 Shielding parameter (s)
C4.4 TOPOGRAPHIC MULTIPLIER (Mt)
C4.4.1 General
C4.4.2 Hill-shape multiplier (Mh)
C4.4.3 Lee multiplier (Mlee)
SECTION C5 AERODYNAMIC SHAPE FACTOR
C5.1 GENERAL
C5.2 EVALUATION OF AERODYNAMIC SHAPE FACTOR
C5.3 INTERNAL PRESSURE FOR ENCLOSED RECTANGULAR BUILDINGS
C5.3.1 General
C5.3.2 Openings
C5.3.3 Dominant openings
C5.4 EXTERNAL PRESSURES FOR ENCLOSED RECTANGULAR BUILDINGS
C5.4.1 External pressure coefficients (Cp,e)
C5.4.2 Area reduction factor (Ka) for roofs and side walls
C5.4.3 Combination factor (Kc)
C5.4.4 Local pressure factor (Kl) for cladding
C5.4.5 Permeable cladding reduction factor (Kp) for roofs and side walls
C5.5 FRICTIONAL DRAG FORCES FOR ENCLOSED BUILDINGS
SECTION C6 DYNAMIC RESPONSE FACTOR
C6.1 EVALUATION OF DYNAMIC RESPONSE FACTOR
C6.2 ALONG-WIND RESPONSE FOR TALL BUILDINGS AND TOWERS
C6.2.1 General
C6.2.2 Dynamic response factor (Cdyn)
C6.3 CROSSWIND RESPONSE
C6.3.1 General
C6.3.2 Crosswind response of tall enclosed buildings and towers of rectangular cross-sect...
C6.3.3 Crosswind response of chimneys, masts and poles of circular cross-section
C6.4 COMBINATION OF ALONG-WIND AND CROSSWIND RESPONSE
APPENDIX CA - DEFINITIONS
APPENDIX CB - NOTATION
APPENDIX CC - ADDITIONAL PRESSURE COEFFICIENTS FOR ENCLOSED BUILDINGS
CC1 ADDITIONAL PRESSURE COEFFICENTS
CC2 MULTI-SPAN BUILDINGS ( < 60°)
CC3 BUILDINGS WITH CURVED ROOFS
CC4 MANSARD ROOFS
CC5 CIRCULAR BINS, SILOS AND TANKS
CC5.1 General
CC5.2 Isolated circular bins, silos and tanks
APPENDIX CD - FREESTANDING WALLS, HOARDINGS AND CANOPIES
CD1 GENERAL
CD1.1 Application
CD1.2 Area reduction factor (Ka)
CD1.3 Local net pressure factor (Kl)
CD1.4 Net porosity factor (Kp)
CD2 FREESTANDING HOARDINGS AND WALLS
CD2.1 Aerodynamic shape factor for normal net pressure on freestanding hoardings and walls
CD2.2 Aerodynamic shape factor for frictional drag
CD3 FREE ROOFS AND CANOPIES
CD3.1 Aerodynamic shape factor for local net pressure on free roofs
CD3.2 Aerodynamic shape factor for frictional drag and drag on exposed members of free ro...
CD4 ATTACHED CANOPIES, AWNINGS AND CARPORTS (ROOFS)
CD4.1 Aerodynamic shape factor for normal net pressure on attached canopies
CD4.2 Aerodynamic shape factor for frictional drag and drag on exposed members of attache...
CD5 CANTILEVERED ROOFS AND CANOPIES
APPENDIX CE - AERODYNAMIC SHAPE FACTORS FOR EXPOSED STRUCTURAL MEMBERS, FRAMES AND LATTIC...
CE1 GENERAL
CE2 AERODYNAMIC SHAPE FACTORS FOR INDIVIDUAL MEMBERS AND FRAMES
CE2.1 Simple shapes and individual members
CE2.2 Open frames in a single plane
CE2.3 Multiple open frames
CE3 DRAG FACTORS FOR STRUCTURAL MEMBERS AND SIMPLE SECTIONS
CE3.1 Rounded cylindrical shapes, sharp-edged prisms and structural sections
CE3.2 Rectangular prismatic sections
CE4 LATTICE TOWERS
CE4.1 General
CE4.2 Drag force coefficient
APPENDIX CF - FLAGS AND CIRCULAR SHAPES
CF1 GENERAL
CF2 FLAGS
CF3 CIRCULAR SHAPES
APPENDIX CG - ACCELERATIONS FOR WIND SENSITIVE STRUCTURES
CG1 ACCELERATION FOR SERVICEABILITY
CG2 PEAK ALONG-WIND ACCELERATION FOR SERVICEABILITY
CG3 CROSSWIND ACCELERATION FOR SERVICEABILITY OF TALL BUILDINGS AND TOWERS OF RECTANGULAR...
CG3.1 General
CG3.2 Peak crosswind acceleration for serviceability
  
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Tile in English:  structural design actions - wind actions - commentary (supplement to as/nzs 1170.2:2002)

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