WIND LOADING (BS6399)
In accordance with BS6399
Tedds calculation version 3.0.17
Building data
Type of roof; Duopitch
Length of building; L = 70000 mm
Width of building; W = 11500 mm
Height to eaves; H = 3200 mm
Pitch of roof; 0 = 5.0 deg
Reference height; Hr = 3703 mm
Dynamic classification
Building type factor (Table 1); Kb = 8.0
Dynamic augmentation factor (1.6.1); Cr = [Kb ( Hr / (0.1 m) )0.75] / ( 800 log( Hr / (0.1 m))) =
0.10
Site wind speed
Location; Sohar
Basic wind speed (Figure 6 BS6399:Pt 2) Vb = 23.0 m/s
Site altitude S = 10 m
Upwind distance from sea to site dsea = 15 km
Direction factor Sd =1.00
Seasonal factor Ss = 1.00
Probability factor Sp = 1.00
Critical gap between buildings; g = 5000 mm
Topography not significant
Altitude factor; Sa = 1 + 0.001 S / 1m = 1.01
Site wind speed Vs = Vb Sa Sd Ss Sp = 23.2 m/s
Terrain category; Town
Displacement height (sheltering effect excluded); Hd = 0mm
The velocity pressure for the windward face of the building with a 0 degree wind is to be considered as 1
part as the height h is less than b (cl.2.2.3.2)
The velocity pressure for the windward face of the building with a 90 degree wind is to be considered as
1 part as the height h is less than b (cl.2.2.3.2)
Dynamic pressure - windward wall - Wind 0 deg and roof
Reference height (at which q is sought); Href = 3200mm
Effective height; He = max(Href – Hd, 0.4 Href) = 3200mm
Fetch factor (Table 22); Sc = 0.838
Turbulence factor (Table 22); St = 0.206
Fetch adjustment factor (Table 23); Tc = 0.673
Turbulence adjustment factor (Table 23); Tt = 1.810
Gust peak factor; gt = 3.44
Terrain and building factor; Sb = Sc Tc (1 + (gt St Tt) + Sh) = 1.29
Effective wind speed; Ve = Vs Sb = 29.9 m/s
Dynamic pressure; qs = 0.613 kg/m3 Ve2 = 0.548 kN/m2
Dynamic pressure - windward wall - Wind 90 deg and roof
Reference height (at which q is sought); Href = 3703mm
Effective height; He = max(Href – Hd, 0.4 Href) = 3703mm
Fetch factor (Table 22); Sc = 0.867
Turbulence factor (Table 22); St = 0.202
Fetch adjustment factor (Table 23); Tc = 0.696
Turbulence adjustment factor (Table 23); Tt = 1.760
Gust peak factor; gt = 3.44
Terrain and building factor; Sb = Sc Tc (1 + (gt St Tt) + Sh) = 1.34
Effective wind speed; Ve = Vs Sb = 31.1 m/s
Dynamic pressure; qs = 0.613 kg/m3 Ve2 = 0.594 kN/m2
Size effect factors
Diagonal dimension for gablewall; aeg = 11.9 m
External size effect factor gablewall; Caeg = 0.921
Diagonal dimension for side wall; aes = 70.1 m
External size effect factor side wall; Caes = 0.761
Diagonal dimension for roof; aer = 70.2 m
External size effect factor roof; Caer = 0.761
Room/storey volume for internal size effect factor; Vi = 0.125 m3
Diagonal dimension for internal size effect factors; ai = 10 ( Vi )1/3 = 5.000 m
Internal size effect factor; Cai = 1.000
Pressures and forces
Net pressure; p = qs cpe Cae - qs cpi Cai;
Net force; Fw = p Aref;
Roof load case 1 - Wind 0, cpi -0.30, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A (-ve) -1.80 0.59 0.761 -0.64 5.51 -3.50
B (-ve) -1.20 0.59 0.761 -0.36 46.53 -16.94
C (-ve) -0.60 0.59 0.761 -0.09 352.00 -32.70
E (-ve) -0.90 0.59 0.761 -0.23 5.51 -1.26
F (-ve) -0.30 0.59 0.761 0.04 46.53 1.99
G (-ve) -0.40 0.59 0.761 0.00 352.00 -0.89
Total vertical net force; Fw,v = -53.09 kN
Total horizontal net force; Fw,h = -4.62 kN
Walls load case 1 - Wind 0, cpi -0.30, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A -1.49 0.59 0.921 -0.64 4.84 -3.09
B -0.86 0.59 0.921 -0.30 21.02 -6.20
C -0.76 0.59 0.921 -0.24 13.83 -3.29
w 0.63 0.55 0.761 0.43 224.00 96.06
l -0.50 0.55 0.761 -0.04 224.00 -9.87
Overall loading
Equiv leeward net force for overall section; Fl =Fw,wl = -9.9 kN
Net windward force for overall section; Fw = Fw,ww = 96.1 kN
Overall loading overall section; Fw,w = 0.85 (1 + Cr) (Fw - Fl + Fw,h) = 94.4 kN
Roof load case 2 - Wind 0, cpi -0.30, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A (-ve) -1.80 0.59 0.761 -0.64 5.51 -3.50
B (-ve) -1.20 0.59 0.761 -0.36 46.53 -16.94
C (-ve) -0.60 0.59 0.761 -0.09 352.00 -32.70
E (-ve) -0.90 0.59 0.761 -0.23 5.51 -1.26
F (-ve) -0.30 0.59 0.761 0.04 46.53 1.99
G (-ve) -0.40 0.59 0.761 0.00 352.00 -0.89
Total vertical net force; Fw,v = -53.09 kN
Total horizontal net force; Fw,h = -4.62 kN
Walls load case 2 - Wind 0, cpi -0.30, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A -1.49 0.59 0.921 -0.64 4.84 -3.09
B -0.86 0.59 0.921 -0.30 21.02 -6.20
C -0.76 0.59 0.921 -0.24 13.83 -3.29
w 0.63 0.55 0.761 0.43 224.00 96.06
l -0.50 0.55 0.761 -0.04 224.00 -9.87
Overall loading
Equiv leeward net force for overall section; Fl =Fw,wl = -9.9 kN
Net windward force for overall section; Fw = Fw,ww = 96.1 kN
Overall loading overall section; Fw,w = 0.85 (1 + Cr) (Fw - Fl + Fw,h) = 94.4 kN
Roof load case 3 - Wind 0, cpi 0.20, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A (-ve) -1.80 0.59 0.761 -0.93 5.51 -5.13
B (-ve) -1.20 0.59 0.761 -0.66 46.53 -30.76
C (-ve) -0.60 0.59 0.761 -0.39 352.00 -137.26
E (-ve) -0.90 0.59 0.761 -0.53 5.51 -2.89
F (-ve) -0.30 0.59 0.761 -0.25 46.53 -11.84
G (-ve) -0.40 0.59 0.761 -0.30 352.00 -105.45
Total vertical net force; Fw,v = -292.21 kN
Total horizontal net force; Fw,h = -4.62 kN
Walls load case 3 - Wind 0, cpi 0.20, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A -1.49 0.59 0.921 -0.94 4.84 -4.53
B -0.86 0.59 0.921 -0.59 21.02 -12.45
C -0.76 0.59 0.921 -0.53 13.83 -7.40
w 0.63 0.55 0.761 0.15 224.00 34.66
l -0.50 0.55 0.761 -0.32 224.00 -71.27
Overall loading
Equiv leeward net force for overall section; Fl =Fw,wl = -71.3 kN
Net windward force for overall section; Fw = Fw,ww = 34.7 kN
Overall loading overall section; Fw,w = 0.85 (1 + Cr) (Fw - Fl + Fw,h) = 94.4 kN
Roof load case 4 - Wind 0, cpi 0.20, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A (-ve) -1.80 0.59 0.761 -0.93 5.51 -5.13
B (-ve) -1.20 0.59 0.761 -0.66 46.53 -30.76
C (-ve) -0.60 0.59 0.761 -0.39 352.00 -137.26
E (-ve) -0.90 0.59 0.761 -0.53 5.51 -2.89
F (-ve) -0.30 0.59 0.761 -0.25 46.53 -11.84
G (-ve) -0.40 0.59 0.761 -0.30 352.00 -105.45
Total vertical net force; Fw,v = -292.21 kN
Total horizontal net force; Fw,h = -4.62 kN
Walls load case 4 - Wind 0, cpi 0.20, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A -1.49 0.59 0.921 -0.94 4.84 -4.53
B -0.86 0.59 0.921 -0.59 21.02 -12.45
C -0.76 0.59 0.921 -0.53 13.83 -7.40
w 0.63 0.55 0.761 0.15 224.00 34.66
l -0.50 0.55 0.761 -0.32 224.00 -71.27
Overall loading
Equiv leeward net force for overall section; Fl =Fw,wl = -71.3 kN
Net windward force for overall section; Fw = Fw,ww = 34.7 kN
Overall loading overall section; Fw,w = 0.85 (1 + Cr) (Fw - Fl + Fw,h) = 94.4 kN
Roof load case 5 - Wind 90, cpi 0.20, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A (-ve) -2.00 0.59 0.761 -1.02 4.27 -4.37
B (-ve) -1.10 0.59 0.761 -0.62 4.27 -2.63
C (-ve) -0.60 0.59 0.761 -0.39 34.20 -13.34
D (-ve) -0.50 0.59 0.761 -0.34 765.33 -263.85
Total vertical net force; Fw,v = -283.11 kN
Total horizontal net force; Fw,h = 0.00 kN
Walls load case 5 - Wind 90, cpi 0.20, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A -1.43 0.55 0.761 -0.71 4.10 -2.89
B -0.84 0.55 0.761 -0.46 16.38 -7.56
C -0.67 0.55 0.761 -0.39 203.52 -79.61
w 0.60 0.59 0.921 0.21 39.69 8.32
l -0.50 0.59 0.921 -0.39 39.69 -15.58
Overall loading
Equiv leeward net force for overall section; Fl =Fw,wl = -15.6 kN
Net windward force for overall section; Fw = Fw,ww = 8.3 kN
Overall loading overall section; Fw,w = 0.85 (1 + Cr) (Fw - Fl + Fw,h) = 22.3 kN
Roof load case 6 - Wind 90, cpi -0.30, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A (-ve) -2.00 0.59 0.761 -0.73 4.27 -3.10
B (-ve) -1.10 0.59 0.761 -0.32 4.27 -1.36
C (-ve) -0.60 0.59 0.761 -0.09 34.20 -3.18
D (-ve) -0.50 0.59 0.761 -0.05 765.33 -36.51
Total vertical net force; Fw,v = -43.99 kN
Total horizontal net force; Fw,h = 0.00 kN
Walls load case 6 - Wind 90, cpi -0.30, - cpe
Ext pressure Dynamic Net
External size Area, Net force,
Zone coefficient, pressure, qs Pressure,
factor, Cae Aref (m2) Fw (kN)
cpe (kN/m2) p (kN/m2)
A -1.43 0.55 0.761 -0.43 4.10 -1.77
B -0.84 0.55 0.761 -0.19 16.38 -3.07
C -0.67 0.55 0.761 -0.12 203.52 -23.83
w 0.60 0.59 0.921 0.51 39.69 20.11
l -0.50 0.59 0.921 -0.10 39.69 -3.79
Overall loading
Equiv leeward net force for overall section; Fl =Fw,wl = -3.8 kN
Net windward force for overall section; Fw = Fw,ww = 20.1 kN
Overall loading overall section; Fw,w = 0.85 (1 + Cr) (Fw - Fl + Fw,h) = 22.3 kN
