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PD 6688-1-4:2015 Background information to the National Annex to BS EN 1991-1-4 and additional guidance, 2015
- Foreword
- Introduction
- 1 Scope
- 2 UK National Annex to BS EN 1991-1-4:2005
- 3 Data that can be used in conjunction with BS EN 1991-1-4:2005
- Annex A (informative) Vortex shedding and aeroelastic instabilities
- Annex B (informative) Along-wind response of lattice towers
- Bibliography
- Figure 1 An example of altitude correction factors [Go to Page]
- Figure 2 Hill parameters in undulating terrain
- Figure 3 Typical examples of buildings with re-entrant corners and recessed bays
- Figure 4 Examples of flush irregular walls
- Figure 5 Keys for walls of inset storey
- Figure 6 Key for inset storey
- Figure 7 Key to canopies attached to buildings
- Figure 8 Wind directions for a rectangular plan building
- Figure 9 Key for vertical walls of buildings
- Figure 10 Definitions of crosswind breadth and in wind depth
- Figure A.1 Strouhal number St for rectangular cross-sections with sharp corners
- Figure A.2 Strouhal number St for bridge decks
- Figure A.3 Bridge types and reference dimensions
- Figure A.4 Bridge deck details
- Figure A.5 Basic value of the lateral force coefficient clat,0 versus Reynolds number Re(vcrit,i)
- Figure A.6 Examples for application of the correlation length Lj (j = 1, 2, 3)
- Figure A.7 In-line and grouped arrangements of cylinders
- Figure A.8 Geometric parameters for interference galloping
- Figure A.9 �Rate of change of aerodynamic moment coefficient dcM/dθ with respect to geometric centre “GC” for rectangular section
- Figure B.1 Gust peak factor (Davenport’s g)
- Figure B.2 Definition of fetch for two roughness changes
- Figure B.3 Fictitious square lattice tower with 12 panels
- Figure B.4 Illustration of parameters for shear patch loading
- Table 1 Global vertical force coefficients for canopies attached to tall buildings
- Table 2 Internal pressure coefficients cpi for open-sided buildings
- Table 3 Internal pressure coefficients cpi for open-topped vertical cylinders
- Table 4 External pressure coefficients Cpe for vertical walls of rectangular-plan buildings
- Table 5 Reduction factors for zone A on vertical walls of polygonal‑plan buildings
- Table A.1 Strouhal numbers St for different cross-sections
- Table A.2 Basic value of the lateral force coefficient clat,0 for different cross-sections
- Table A.3 Lateral force coefficient clat versus critical wind velocity ratio vcrit,i/vm,Lj
- Table A.4 Effective correlation length Lj as a function of vibration amplitude yF(sj)
- Table A.5 Correlation length factor KW and mode shape factor K for some simple structures
- Table A.6 Constants for determination of the effect of vortex shedding
- Table A.7 Assessment of vortex excitation effects
- Table A.8 Factor of galloping instability aG
- Table A.9 �Data for the estimation of crosswind response of coupled cylinders at in-line and grouped arrangements
- 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)
- Table B.2 Length scale for zLu for two roughness changes where x1 = 0,1 km for an upwind fetch of x km
- 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
- 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
- Table B.7 Length scale for zLu for two roughness changes where x1 = 30 km for an upwind fetch of x km
- Table B.8 Meteorological parameters
- Table B.9 Non‑dimensional coefficients, wind forces and wind moments
- Table B.10 Values of c(z) c(z’)
- Table B.11 Values of C(z‑z’)
- Table B.12 Values of c(z) c(z’) C(z‑z’)
- Table B.13 Non‑dimensional coefficients and wind forces
- Table B.14 Values of c(z) c(z’)
- Table B.15 Values of c(z) c(z’) C(z‑z’)
- Table B.16 Non‑dimensional coefficients, wind forces and moments
- Table B.17 Values of c(z) c(z’)
- Table B.18 Values of C(z‑z’)
- Table B.19 Values of c(z) c(z’) C(z‑z’)
- Table B.20 Non‑dimensional coefficients and wind forces
- Table B.21 Values of c(z) c(z’)
- Table B.22 Values of c(z) c(z’) C(z‑z’)
- Table B.23 Non‑dimensional coefficients and wind forces
- Table B.24 Lever arms, wind loads and moments above zip
- Table B.25 Lever arms, wind loads and moments below zip
- Table B.26 Values of c(z) c(z’)
- Table B.27 Valuesof C(z‑z’)
- Table B.28 Values of c(z) c(z’) C(z‑z’)
- Table B.29 Meteorological parameters
- Table B.30 Non‑dimensional coefficients, wind forces and wind moments
- Table B.31 Values of c(z) c(z’)
- Table B.32 Values of C(z‑z’)
- Table B.33 Values of c(z) c(z’) C(z‑z’)
- Table B.34 Large ancillary wind resistance [Go to Page]