BS 8100-4:1995:2005 Edition
$191.13
Lattice towers and masts – Code of practice for loading of guyed masts
| Published By | Publication Date | Number of Pages |
| BSI | 2005 | 88 |
Gives recommendations for procedures to be used to determine the loading for the design and appraisal of guyed masts of lattice construction.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 7 | General Scope References Definitions wind resistance linear ancillary item discrete ancillary item projected area panel |
| 8 | section characteristic strength design strength Symbols Main symbols |
| 9 | Subscripts |
| 11 | Performance Safety and service life General Service life Classification of required reliability General Environmental conditions Economic consequences or usage |
| 12 | Classifications of quality General Class A masts Class B masts Class C masts |
| 13 | Appraisal of existing masts Reappraisal following significant loading changes Safety factors Wind speed and ice thickness factors Dead load and partial factors |
| 14 | Partial safety factors on wind speed, ice thickness, dead load and design strength |
| 15 | Safety assessment Serviceability Information to be provided by specifiers |
| 17 | Meteorological parameters Wind speed data General Basic wind speed Site wind speed Altitude factor |
| 18 | Direction factor Values of Sd for the United Kingdom Seasonal factor Terrain categories |
| 20 | Basic hourly mean wind speeds |
| 21 | Effective wind speed General Sites in country terrain: terrain factor S Sites in town terrain: terrain factor S |
| 22 | Topography factor Serviceability |
| 23 | Fetch factor S |
| 24 | Fetch adjustment factor T |
| 25 | Fatigue life assessment In-line vibrations Crosswind vibrations Ice loading General |
| 26 | Basic ice thickness |
| 27 | Reference ice thickness Ice weight |
| 28 | Ice thickness r |
| 29 | Wind resistance General Method of derivation Constraints on the method Calculation of total wind resistance Wind resistance of mast structure General |
| 30 | Overall normal drag (pressure) coefficients Linear ancillaries |
| 31 | Discrete ancillaries Guys Icing |
| 32 | Projected panel area used to calculate the solidity ratio Π|
| 33 | Wind incidence factor |
| 34 | Overall normal drag (pressure) coefficients C |
| 35 | Typical normal drag (pressure) coefficients for individual components Reduction factor K |
| 37 | Structural response to wind Procedure General Criteria for use of static methods |
| 38 | Equivalent static methods Spectral analytical method Deflections Vortex-excited vibrations Guy vibrations Static gust response procedure for masts up to 150 m high General |
| 39 | Mean load effects Fluctuating load effects |
| 40 | Gust response factor for mast column Gust response factors for mast guys Total load effects |
| 41 | Loading for calculating deflections Static gust response procedure: general General Load cases to be considered |
| 43 | Loading for calculating deflections Wind loading for unsymmetrical masts or masts with complex attachments Spectral analytical method Crosswind response due to vortex excitation Critical wind speed |
| 44 | Excitation |
| 45 | Derivation of fluctuating bending moment diagrams |
| 46 | Basic gust response factor |
| 47 | Length factor K |
| 48 | Projected length of guy |
| 49 | Guy or cable height factor |
| 50 | Derivation of total load effects for the procedure given in 5.2 |
| 51 | Application of patch loads Turbulence intensity |
| 52 | Turbulence factor K |
| 53 | Factor K |
| 54 | Application of patch loading” |
| 55 | “Excitation coefficient k |
| 56 | (informative) Method of assessment for classification of quality (informative) Method of assessment for classification of quality Reliability of a mast Quality assessment Assessment of quality rating Determination of quality classification |
| 57 | (normative) Deflections and fatigue (normative) Deflections and fatigue Downwind deflections Crosswind deflections (vortex shedding) |
| 58 | Hours per year in which the hourly mean wind speed exceeds the serviceability limit |
| 59 | Wind speed duration factor |
| 60 | Expected average annual occurrence of mean wind speeds as a function of direction |
| 61 | (informative) Derivation of extreme wind information: and S (informative) Derivation of extreme wind information: and S |
| 62 | (informative) Gradient wind speeds (informative) Gradient wind speeds General Gradient wind speeds Effective wind speed |
| 63 | Hourly mean gradient wind speed for the United Kingdom |
| 64 | Gradient wind speed reduction factor K (informative) Seasonal factor S (informative) Seasonal factor S Values of S |
| 65 | (informative) Terrain categories (informative) Terrain categories General Variation of fetch |
| 66 | Typical town site (informative) Effective height (informative) Effective height |
| 67 | Effective heights in towns (normative) Topography factors (normative) Topography factors General Topography factor |
| 68 | Values of L |
| 69 | Definition of topographic dimensions |
| 70 | Topographic location factor s for hills and ridges |
| 71 | Topographic location factor s for cliffs and escarpments |
| 72 | (informative) Hill parameters in undulating terrain (informative) Hill parameters in undulating terrain Hill parameters in undulating terrain |
| 73 | Hill parameters in undulating terrain |
| 74 | (normative) General method for determination of wind resistance (normative) General method for determination of wind resistance Calculation of total wind resistance |
| 75 | Normal drag (pressure) coefficients for single frames |
| 76 | Shielding factor ½f for single frames composed of flat-sided members |
| 77 | Normal drag (pressure) coefficient C |
| 78 | (normative) Equations used for the production of the curves in the figures (normative) Equations used for the production of the curves in the figures General Symbols Meteorological parameters in Figure 3 and Figure 4 Wind resistance Figure 7: wind incidence factor, |
| 79 | Figure 8: overall normal drag (pressure) coefficients C Structural response to wind General Figure 15 General method for wind resistance Figure K.1: shielding factor, ½ Figure K.2: normal drag (pressure) coefficient C |
| 80 | (normative) Parameters for spectral analytical methods (normative) Parameters for spectral analytical methods Spectral response General Total response Mean response Peak gust response Resonant response Wind parameters for resonant response calculation |
| 81 | Damping General Structural damping Aerodynamic damping |
| 82 | Modal response Logarithmic decrements of damping |
| 83 | (informative) Parameters Æ (informative) Parameters Æ General Background scaling factor Resonant magnification factor |
| 84 | Turbulent length scale factor (normative) Loading for unsymmetric masts or masts with complex attachments (normative) Loading for unsymmetric masts or masts with complex attachments General Steady state loads |
| 85 | Fluctuating loads Calculations of wind forces in mast members |
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