Standard
Track updates
AS ISO 12494-2005
[Current]Atmospheric icing of structures
Provides information on collection of data on icing and on loads for categories of ice accumulation.
Published: 26/04/2005
Pages: 56
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope
1.1 General
1.2 Application
2 Normative references
3 Terms and definitions
4 Symbols
5 Effects of icing
5.1 General
5.2 Static ice loads
5.3 Wind action on iced structures
5.4 Dynamic effects
5.5 Damage caused by falling ice
6 Fundamentals of atmospheric icing
6.1 General
6.2 Icing types
6.2.1 General
6.2.2 Glaze
6.2.3 Wet snow
6.2.4 Rime
6.2.5 Other types of ice
6.3 Topographic influences
6.4 Variation with height above terrain
7 Icing on structures
7.1 General
7.2 Ice classes
7.3 Definition of ice class, IC
7.4 Glaze
7.4.1 General
7.4.2 Glaze on lattice structures
7.5 Rime
7.5.1 General
7.5.2 Rime on single members
7.5.2.1 General
7.5.2.2 Slender structural members with object width ≤ 300 mm
7.5.2.3 Single members with object width (W) > 300 mm
7.6 Rime on lattice structures
7.6.1 General
7.6.2 Direction of ice vanes on the structure
7.6.3 Icing on members inclined to the wind direction
8 Wind actions on iced structures
8.1 General
8.2 Single members
8.2.1 General
8.2.2 Drag coefficients for glaze
8.2.3 Drag coefficients for rime
8.3 Angle of incidence
8.4 Lattice structures
9 Combination of ice loads and wind actions
9.1 General
9.2 Combined loads
10 Unbalanced ice load on guys
11 Falling ice considerations
Annex A
A.1 Equations connected to figures
A.2 Equations connected to tables
Annex B
B.1 Introduction
B.2 General considerations
B.3 Recommended measurements
B.3.1 Standard reference measurements
B.3.2 Other observations
B.3.3 Output of measurements
B.3.4 Additional meteorological measurements
B.4 Measurements on other objects
B.5 Responsibility
Annex C
C.1 Fundamentals
C.2 Rate of icing
C.2.1 General
C.2.2 Collision efficiency
C.2.3 Sticking efficiency
C.2.4 Accretion efficiency
C.3 Numerical modelling
C.4 Discussion
Annex D
D.1 Introduction
D.2 Data
D.3 Methods
D.3.1 Freezing precipitation
D.3.2 In-cloud icing
D.3.3 Wet snow
D.4 Application
Annex E
E.1 Introduction
E.2 Find ice class(es) for the building site
E.3 Find ice accretion on types of profiles in question
E.3.1 Structures built of single members (e.g. lattice structures)
E.3.2 Non-lattice structures or large profile dimensions
E.4 Find drag coefficients for iced members in question
E.5 Adjustment of drag coefficients for angle of incidence
E.6 Calculation of wind action on the iced structure
E.7 Calculation of ice load of the iced structure
E.8 Combination of wind action and ice load
Bibliography
Cited references in this standard
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