BS 8100-1:1986

Committees responsible
Foreword
Section 1. General
1.1 Scope
1.2 Definitions
1.3 Symbols
    1.3.1 Main symbols
    1.3.2 Subscripts
Section 2. Performance requirements
2.1 Safety and service life
    2.1.1 General
    2.1.2 Service life
2.2 Classification of required reliability
    2.2.1 General
    2.2.2 Environmental conditions
    2.2.3 Economic consequences of usage
2.3 Classification of quality
    2.3.1 General
    2.3.2 Class A towers
    2.3.3 Class B towers
    2.3.4 Class C towers
2.4 Safety factors
    2.4.1 Wind speed and ice thickness factors
    2.4.2 Dead load and partial factors
2.5 Safety assessment
2.6 Serviceability
Section 3. Meteorological parameters
3.1 Wind speed data
    3.1.1 General
    3.1.2 Basic wind speed
    3.1.3 Wind direction factor
    3.1.4 Terrain roughness factor
    3.1.5 Site reference wind speed
3.2 Variation of wind speed with height
    3.2.1 Sites on level terrain
    3.2.2 Sites on hills
3.3 Serviceability
    3.3.1 Distribution of wind speeds
    3.3.2 Downwind deflections
    3.3.3 Crosswind deflections (vortex shedding)
3.4 Fatigue life assessment
    3.4.1 In-line vibrations
    3.4.2 Crosswind vibrations
3.5 Ice loading
    3.5.1 General
    3.5.2 Basic ice thickness
    3.5.3 Reference ice thickness
    3.5.4 Ice weight
Section 4. Wind resistance
4.1 General
    4.1.1 Method of derivation
    4.1.2 Symmetrical towers without ancillaries
    4.1.3 Symmetrical towers with limited ancillaries
    4.1.4 Other cases
4.2 Method for symmetrical towers without ancillaries
    4.2.1 Calculation of total wind resistance
    4.2.2 Overall drag coefficients
4.3 Method for symmetrical towers with limited
    ancillaries
    4.3.1 Constraints for simplified method
    4.3.2 Calculation of total wind resistance
4.4 General method for towers containing ancillaries
    or unsymmetrical towers
    4.4.1 Calculation of total wind resistance
    4.4.2 Drag (pressure) coefficients for single frames
4.5 Linear ancillaries
4.6 Discrete ancillaries
4.7 Cables
4.8 Icing
Section 5. Structural response to wind
5.1 Procedure
    5.1.1 General
    5.1.2 Equivalent static method
    5.1.3 Spectral analytical method
    5.1.4 Deflections
    5.1.5 Vortex-excited vibrations
5.2 Wind loading for symmetrical towers
    5.2.1 General
    5.2.2 Basic gust response factor
    5.2.3 Loading for calculating bending moments
    5.2.4 Loading for calculating shear forces
    5.2.5 Loading for calculating deflections
    5.2.6 Calculation of wind forces in tower members
5.3 Wind loading for towers with complex attachments
    5.3.1 General
    5.3.2 Loading on ancillary items
    5.3.3 Loading on cables
    5.3.4 Calculation of wind forces in tower members
    5.3.5 Loading for calculating deflections
5.4 Spectral analytical method
5.5 Crosswind response due to vortex excitation
    5.5.1 Critical wind speed
    5.5.2 Excitation
Appendix A Measurement and interpretation of wind data
Appendix B Terrain parameters
Appendix C Gradient wind speeds
Appendix D Hill parameters in undulating terrain
Appendix E Parameters for spectral analytical methods
Appendix F Method of assessment for classification of
           quality
Appendix G Equations used for the production of the curves
           in the figures
Publications referred to

Provides recommendations for procedures to be used to determine the loading for the design or appraisal of free-standing tower structures of lattice construction.