BS 6399-2:1995

Committees responsible
Foreword
Section 1. General
1.1 Scope
1.2 Informative references
1.3 Definitions
1.4 Main symbols
1.5 Outline of procedure for calculating wind loads
1.6 Dynamic classification
1.7 Site exposure
1.8 Choice of method
Section 2. Standard method
2.1 Standard wind loads
2.2 Standard wind speeds
2.3 Standard pressure coefficients
2.4 External pressure coefficients for walls
2.5 External pressure coefficients for roofs
2.6 Internal pressure coefficients
2.7 Pressure coefficients for elements
Section 3. Directional method
3.1 Directional wind loads
3.2 Directional wind speeds
3.3 Directional pressure coefficients
3.4 Hybrid combinations of standard and directional
      methods
Annexes
A. (normative) Necessary provisions for wind tunnel
      testing
B. (informative) Derivation of extreme wind information
C. (informative) Dynamic augmentation
D. (normative) Probability factor and seasonal factor
E. (informative) Terrain categories and effective height
F. (informative) Gust peak factor
Tables
1. Building-type factor Kb
2. Dynamic pressure qs (in Pa)
3. Valves of direction factor Sd
4. Factor Sb for standard method
5. External pressure coefficients Cpe for vertical walls
6. Frictional drag coefficients
7. External pressure Cpe coefficients for walls of
      circular-plan buildings
8. External pressure coefficients Cpe for flat roofs
      of buildings
9. External pressure coefficients Cpe for monopitch
      roofs of buildings
10. External pressure coefficients Cpe for duopitch
      roofs of buildings
11. External pressure coefficients Cpe for hipped roofs
      of buildings
12. Reduction factor for multi-bay roofs
13. Net pressure coefficients Cp for free-standing mono-
      pitch canopy roofs
14. Net pressure coefficients Cp for free-standing duo-
      pitch canopy roofs
15. Reduction factors for free-standing multi-bay canopy
      roofs
16. Internal pressure coefficients Cpi for enclosed
      buildings
17. Internal pressure coefficients Cpi for buildings
      with dominant openings
18. Internal pressure coefficients Cpi for open-sided
      buildings
19. Internal pressure coefficients Cp for open-topped
      vertical cylinders
20. Net pressure coefficients Cp for long elements
21. Net pressure coefficients Cp for free-standing
      walls
22. Factors Sc and St
23. Adjustment factors Tc and Tt for sites in town
      terrain
24. Gust peak factor gt
25. Values of Le and Sh
26. External pressure coefficients Cpe for vertical
      walls of rectangular-plan buildings
27. Reduction factors for zone A on vertical walls of
      polygonal-plan buildings
28. External pressure coefficients Cpe for vertical
      gable walls adjacent to non-vertical walls and
      roofs
29. External pressure coefficients Cpe for windward-
      facing non-vertical walls
30. External pressure coefficients
31. Reduction factor for zones A to D, H to J and Q to S
      of flat roofs with parapets
32. External pressure coefficients Cpe for flat roofs
      with curved eaves
33. External pressure coefficients Cpe for flat roofs
      with mansard eaves
34. External pressure coefficients Cpe for pitched roof
      zones A to J
35. External pressure coefficients Cpe for pitched roof
      zones K to S
36. External pressure coefficients Cpe for additional
      zones T to Y of hipped roofs
37. Internal pressure coefficients Cpi for open-sided
      bulidings
D.1 Values of seasonal factor
Figures
1. Flowchart illustrating outline procedure
2. Basic definitions of building dimensions
3. Dynamic augmentation factor Cr
4. Size effect factor Ca of standard method
5. Definition of diagonal of loaded areas
6. Basic wind speed Vb (in m/s)
7. Definition of significant topography
8. Definition of topographic dimensions
9. Topographic location factor s for hills and ridges
10. Topographic location factor s for cliffs and
      escarpments
11. Division of buildings by parts for lateral loads
12. Key to wall pressure data
13. Typical examples of buildings with re-entrant
      corners and recessed bays
14. Examples of flush irregular walls
15. Key for walls of inset storey
16. Key for flat roofs
17. Key to eave details for flat roofs
18. Key for inset storey
19. Key for monopitch roofs
20. Key for duopitch roofs
21. Key for hipped roofs
22. Key for mansard and multipitch roofs
23. Key for multi-bay roofs
24. Key for free-standing canopy roofs
25. Reduction factor for length of elements
26. Key for free-standing walls
27. Shelter factor for fences
28. Key for signboards
29. Wind directions for a rectangular-plan building
30. Key to overall load P
31. Key for vertical walls of buildings
32. Key to vertical gable walls
33. Key for walls of buildings with re-entrant corners
34. Key for walls of buildings with recessed bays
35. Key to general method for flat roofs
36. Examples of zones of flat roof of arbitrary plan shape
37. Additional zones around inset storey
38. Key for monopitch roofs
39. Symmetries for pitched roofs
40. Key for duopitch roofs
41. Key for hipped roofs
42. Key to multi-bay roofs
E.1 Effective heights in towns
F.1 Gust peak factor gt
List of references

Gives two methods i.e., a standard one in the main text and a directional one in an appendix for calculating the gust peak wind loads that should be taken into account in the design of buildings and the components thereof on land in the United Kingdom.