BSI PD 6688-1-4:2015 – TC:2020 Edition
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Tracked Changes. Background information to the National Annex to BS EN 1991-1-4 and additional guidance
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 201 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 104 | Foreword |
| 106 | Introduction 1 Scope 2 UK National Annex to BS EN 1991-1-4:2005 |
| 107 | Figure 1 An example of altitude correction factors |
| 109 | Figure 2 Hill parameters in undulating terrain |
| 116 | 3 Data that can be used in conjunction with BS EN 1991-1-4:2005 |
| 117 | Figure 3 Typical examples of buildings with re-entrant corners and recessed bays |
| 118 | Figure 4 Examples of flush irregular walls |
| 119 | Figure 5 Keys for walls of inset storey |
| 120 | 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 |
| 121 | Table 2 Internal pressure coefficients cpi for open-sided buildings Table 3 Internal pressure coefficients cpi for open-topped vertical cylinders |
| 122 | Figure 8 Wind directions for a rectangular plan building |
| 124 | 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 |
| 125 | Table 5 Reduction factors for zone A on vertical walls of polygonal‑plan buildings |
| 126 | Annex A (informative) Vortex shedding and aeroelastic instabilities |
| 129 | Table A.1 Strouhal numbers St for different cross-sections |
| 130 | Figure A.1 Strouhal number St for rectangular cross-sections with sharp corners Figure A.2 Strouhal number St for bridge decks |
| 132 | Figure A.3 Bridge types and reference dimensions |
| 133 | Figure A.4 Bridge deck details |
| 136 | Table A.2 Basic value of the lateral force coefficient clat,0 for different cross-sections |
| 137 | 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 |
| 138 | Figure A.6 Examples for application of the correlation length Lj (j = 1, 2, 3) |
| 139 | Table A.4 Effective correlation length Lj as a function of vibration amplitude yF(sj) |
| 140 | Table A.5 Correlation length factor KW and mode shape factor K for some simple structures |
| 142 | Figure A.7 In-line and grouped arrangements of cylinders |
| 144 | Table A.6 Constants for determination of the effect of vortex shedding |
| 147 | Table A.7 Assessment of vortex excitation effects |
| 149 | Table A.8 Factor of galloping instability aG |
| 150 | Table A.9 �Data for the estimation of crosswind response of coupled cylinders at in-line and grouped arrangements |
| 153 | Figure A.8 Geometric parameters for interference galloping |
| 154 | Figure A.9 �Rate of change of aerodynamic moment coefficient dcM/dθ with respect to geometric centre “GC” for rectangular section |
| 157 | Annex B (informative) Along-wind response of lattice towers |
| 159 | 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) |
| 161 | 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 |
| 162 | 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 |
| 163 | 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 |
| 164 | Table B.7 Length scale for zLu for two roughness changes where x1 = 30 km for an upwind fetch of x km |
| 165 | Figure B.3 Fictitious square lattice tower with 12 panels |
| 166 | Table B.8 Meteorological parameters |
| 167 | Table B.9 Non‑dimensional coefficients, wind forces and wind moments |
| 168 | Table B.10 Values of c(z) c(z’) |
| 169 | Table B.11 Values of C(z‑z’) Table B.12 Values of c(z) c(z’) C(z‑z’) |
| 171 | Table B.13 Non‑dimensional coefficients and wind forces |
| 172 | Table B.14 Values of c(z) c(z’) Table B.15 Values of c(z) c(z’) C(z‑z’) |
| 173 | Table B.16 Non‑dimensional coefficients, wind forces and moments |
| 175 | Table B.17 Values of c(z) c(z’) |
| 176 | Table B.18 Values of C(z‑z’) Table B.19 Values of c(z) c(z’) C(z‑z’) |
| 178 | Table B.20 Non‑dimensional coefficients and wind forces |
| 179 | Table B.21 Values of c(z) c(z’) Table B.22 Values of c(z) c(z’) C(z‑z’) |
| 181 | Table B.23 Non‑dimensional coefficients and wind forces |
| 182 | Figure B.4 Illustration of parameters for shear patch loading |
| 183 | Table B.24 Lever arms, wind loads and moments above zip Table B.25 Lever arms, wind loads and moments below zip |
| 185 | Table B.26 Values of c(z) c(z’) |
| 186 | Table B.27 Valuesof C(z‑z’) Table B.28 Values of c(z) c(z’) C(z‑z’) |
| 188 | Table B.29 Meteorological parameters Table B.30 Non‑dimensional coefficients, wind forces and wind moments |
| 190 | Table B.31 Values of c(z) c(z’) |
| 191 | Table B.32 Values of C(z‑z’) Table B.33 Values of c(z) c(z’) C(z‑z’) |
| 193 | Table B.34 Large ancillary wind resistance |
| 195 | Bibliography |
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BSI PD 6688-1-4:2015
Background information to the National Annex to BS EN 1991-1-4 and additional guidance Published By…
