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BSI PD 6688-1-4:2015

BSI PD 6688-1-4:2015

$215.11

Background information to the National Annex to BS EN 1991-1-4 and additional guidance

Published By Publication Date Number of Pages
BSI 2015 102
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This Published Document is a background paper that gives non-contradictory complementary information for use in the UK with BS EN 1991‑1‑4:2005 and its UK National Annex.

This Published Document gives:

  1. background to the decisions made in the National Annexes for some of the Nationally Determined Parameters;

  2. commentary on some specific subclauses from BS EN 1991‑1‑4:2005 ; and

  3. additional data that can be used in conjunction with BS EN 1991‑1‑4:2005 .

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 Introduction
1 Scope
2 UK National Annex to BS EN 1991-1-4:2005
8 Figure 1 An example of altitude correction factors
10 Figure 2 Hill parameters in undulating terrain
17 3 Data that can be used in conjunction with BS EN 1991-1-4:2005
18 Figure 3 Typical examples of buildings with re-entrant corners and recessed bays
19 Figure 4 Examples of flush irregular walls
20 Figure 5 Keys for walls of inset storey
21 Figure 6 Key for inset storey
Figure 7 Key to canopies attached to buildings
Table 1 Global vertical force coefficients for canopies attached to tall buildings
22 Table 2 Internal pressure coefficients cpi for open-sided buildings
Table 3 Internal pressure coefficients cpi for open-topped vertical cylinders
23 Figure 8 Wind directions for a rectangular plan building
25 Figure 9 Key for vertical walls of buildings
Figure 10 Definitions of crosswind breadth and in wind depth
Table 4 External pressure coefficients Cpe for vertical walls of rectangular-plan buildings
26 Table 5 Reduction factors for zone A on vertical walls of polygonal‑plan buildings
27 Annex A (informative) Vortex shedding and aeroelastic instabilities
30 Table A.1 Strouhal numbers St for different cross-sections
31 Figure A.1 Strouhal number St for rectangular cross-sections with sharp corners
Figure A.2 Strouhal number St for bridge decks
33 Figure A.3 Bridge types and reference dimensions
34 Figure A.4 Bridge deck details
37 Table A.2 Basic value of the lateral force coefficient clat,0 for different cross-sections
38 Figure A.5 Basic value of the lateral force coefficient clat,0 versus Reynolds number Re(vcrit,i)
Table A.3 Lateral force coefficient clat versus critical wind velocity ratio vcrit,i/vm,Lj
39 Figure A.6 Examples for application of the correlation length Lj (j = 1, 2, 3)
40 Table A.4 Effective correlation length Lj as a function of vibration amplitude yF(sj)
41 Table A.5 Correlation length factor KW and mode shape factor K for some simple structures
43 Figure A.7 In-line and grouped arrangements of cylinders
45 Table A.6 Constants for determination of the effect of vortex shedding
48 Table A.7 Assessment of vortex excitation effects
50 Table A.8 Factor of galloping instability aG
51 Table A.9 �Data for the estimation of crosswind response of coupled cylinders at in-line and grouped arrangements
54 Figure A.8 Geometric parameters for interference galloping
55 Figure A.9 �Rate of change of aerodynamic moment coefficient dcM/dθ with respect to geometric centre “GC” for rectangular section
58 Annex B (informative) Along-wind response of lattice towers
60 Figure B.1 Gust peak factor (Davenport’s g)
Table B.1 �Length scale zLu for a single roughness change from sea to country terrain, for an upwind fetch from site to sea of x(km)
62 Figure B.2 Definition of fetch for two roughness changes
Table B.2 Length scale for zLu for two roughness changes where x1 = 0,1 km for an upwind fetch of x km
63 Table B.3 Length scale for zLu for two roughness changes where x1 = 0,3 km for an upwind fetch of x km
Table B.4 Length scale for zLu for two roughness changes where x1 = 1 km for an upwind fetch of x km
64 Table B.5 Length scale for zLu for two roughness changes where x1 = 3 km for an upwind fetch of x km
Table B.6 Length scale for zLu for two roughness changes where x1 = 10 km for an upwind fetch of x km
65 Table B.7 Length scale for zLu for two roughness changes where x1 = 30 km for an upwind fetch of x km
66 Figure B.3 Fictitious square lattice tower with 12 panels
67 Table B.8 Meteorological parameters
68 Table B.9 Non‑dimensional coefficients, wind forces and wind moments
69 Table B.10 Values of c(z) c(z’)
70 Table B.11 Values of C(z‑z’)
Table B.12 Values of c(z) c(z’) C(z‑z’)
72 Table B.13 Non‑dimensional coefficients and wind forces
73 Table B.14 Values of c(z) c(z’)
Table B.15 Values of c(z) c(z’) C(z‑z’)
74 Table B.16 Non‑dimensional coefficients, wind forces and moments
76 Table B.17 Values of c(z) c(z’)
77 Table B.18 Values of C(z‑z’)
Table B.19 Values of c(z) c(z’) C(z‑z’)
79 Table B.20 Non‑dimensional coefficients and wind forces
80 Table B.21 Values of c(z) c(z’)
Table B.22 Values of c(z) c(z’) C(z‑z’)
82 Table B.23 Non‑dimensional coefficients and wind forces
83 Figure B.4 Illustration of parameters for shear patch loading
84 Table B.24 Lever arms, wind loads and moments above zip
Table B.25 Lever arms, wind loads and moments below zip
86 Table B.26 Values of c(z) c(z’)
87 Table B.27 Valuesof C(z‑z’)
Table B.28 Values of c(z) c(z’) C(z‑z’)
89 Table B.29 Meteorological parameters
Table B.30 Non‑dimensional coefficients, wind forces and wind moments
91 Table B.31 Values of c(z) c(z’)
92 Table B.32 Values of C(z‑z’)
Table B.33 Values of c(z) c(z’) C(z‑z’)
94 Table B.34 Large ancillary wind resistance
96 Bibliography

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BSI PD 6688-1-4:2015
$215.11