WIND LOADING (BS6399) - clarend.com

1 HBL Associates 38 Radford Street Stone ST15 8DA Project Livingstone House, Brighton, BN3 3WZ Job Ref. 15/ Section Wind Pressure Calculations Sheet 1 Calc. by SL Date 08/05/2015 Chk'd by IT Date 08/05/2015 App'd by Date WIND LOADING (BS6399) WIND LOADING (BS6399) TEDDS calculation version Building data Type of roof Flat Length of building L = 12000 mm Width of building W = 9000 mm Height to eaves H = 30000 mm Eaves type Sharp Reference height Hr = 30000 mm Dynamic classification Building type factor (Table 1) Kb = Dynamic augmentation factor ( ) Cr = [Kb ( Hr / ( m) ) ] / ( 800 log( Hr / ( m)))

2 = Site wind speed Location Brighton Basic wind speed (Figure 6 BS6399:Pt 2) Vb = m/s Site altitude S = 22 m Upwind distance from sea to site dsea = 3 km Direction factor Sd = Seasonal factor Ss = Probability factor Sp = Critical gap between buildings g = 5000000 mm Topography not significant Altitude factor Sa = 1 + S / 1m = Site wind speed Vs = Vb Sa Sd Ss Sp = m/s HBL Associates 38 Radford Street Stone ST15 8DA Project Livingstone House, Brighton, BN3 3WZ Job Ref. 15/ Section Wind Pressure Calculations Sheet 2 Calc.

3 By SL Date 08/05/2015 Chk'd by IT Date 08/05/2015 App'd by Date Terrain category Sea 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 3 parts as the height h is greater than 2b ( ) The velocity pressure for the windward face of the building with a 90 degree wind is to be considered as 3 parts as the height h is greater than 2b ( ) Dynamic pressure - windward wall (lower part) - Wind 0 deg Reference height (at which q is sought) Href = 12000mm Effective height He = max(Href Hd, Href) = 12000mm Fetch factor (Table 22) Sc = Turbulence factor (Table 22) St = Gust peak factor gt = Terrain and building factor Sb = Sc (1 + (gt St) + Sh) = Effective wind speed Ve = Vs Sb = m/s Dynamic pressure qs = kg/m3 Ve2 = kN/m2 Dynamic pressure - windward wall, (middle part) - Wind 0 deg Reference height (at which q is sought)

4 Href = 18000mm Effective height He = max(Href Hd, Href) = 18000mm Fetch factor (Table 22) Sc = Turbulence factor (Table 22) St = Gust peak factor gt = Terrain and building factor Sb = Sc (1 + (gt St) + Sh) = Effective wind speed Ve = Vs Sb = m/s Dynamic pressure qs = kg/m3 Ve2 = kN/m2 Dynamic pressure - windward wall (upper part), other walls and roof - Wind 0 deg Reference height (at which q is sought) Href = 30000mm Effective height He = max(Href Hd, Href) = 30000mm Fetch factor (Table 22) Sc = Turbulence factor (Table 22) St = Gust peak factor gt = Terrain and building factor Sb = Sc (1 + (gt St) + Sh) = Effective wind speed Ve = Vs Sb = m/s Dynamic pressure qs = kg/m3 Ve2 = kN/m2 Dynamic pressure - windward wall (lower part) - Wind 90 deg Reference height (at which q is sought) Href = 9000mm Effective height He = max(Href Hd, Href) = 9000mm Fetch factor (Table 22) Sc = Turbulence factor (Table 22)

5 St = Gust peak factor gt = Terrain and building factor Sb = Sc (1 + (gt St) + Sh) = Effective wind speed Ve = Vs Sb = m/s Dynamic pressure qs = kg/m3 Ve2 = kN/m2 Dynamic pressure - windward wall, (middle part) - Wind 90 deg Reference height (at which q is sought) Href = 21000mm Effective height He = max(Href Hd, Href) = 21000mm Fetch factor (Table 22) Sc = Turbulence factor (Table 22) St = HBL Associates 38 Radford Street Stone ST15 8DA Project Livingstone House, Brighton, BN3 3WZ Job Ref.

6 15/ Section Wind Pressure Calculations Sheet 3 Calc. by SL Date 08/05/2015 Chk'd by IT Date 08/05/2015 App'd by Date Gust peak factor gt = Terrain and building factor Sb = Sc (1 + (gt St) + Sh) = Effective wind speed Ve = Vs Sb = m/s Dynamic pressure qs = kg/m3 Ve2 = kN/m2 Dynamic pressure - windward wall (upper part), other walls and roof - Wind 90 deg Reference height (at which q is sought) Href = 30000mm Effective height He = max(Href Hd, Href) = 30000mm Fetch factor (Table 22) Sc = Turbulence factor (Table 22)

7 St = Gust peak factor gt = Terrain and building factor Sb = Sc (1 + (gt St) + Sh) = Effective wind speed Ve = Vs Sb = m/s Dynamic pressure qs = kg/m3 Ve2 = kN/m2 Size effect factors Diagonal dimension for gablewall aeg = m External size effect factor gablewall Caeg = Diagonal dimension for side wall aes = m External size effect factor side wall Caes = Diagonal dimension for roof aer = m External size effect factor roof Caer = Diagonal dimension for top windward side aeus = m External size effect factor top windward side Caeus = Diagonal dimension for middle windward

8 Side aems = m External size effect factor middle windward side Caems = Diagonal dimension for bottom windward side aebs = m External size effect factor bottom windward side Caebs = Diagonal dimension for top windward gable aeug = m External size effect factor top windward gable Caeug = Diagonal dimension for middle windward gable aemg = m External size effect factor middle windward gable Caemg = Diagonal dimension for bottom windward gable aebg = m External size effect factor bottom windward gable Caebg = Room/storey volume for internal size effect factor Vi = m3 Diagonal dimension for internal size effect factors ai = 10 ( Vi )1/3 = m Internal size effect factor Cai = Pressures and forces Net pressure p = qs cpe Cae - qs cpi Cai Net force Fw = p Aref Roof load case 1 - Wind 0, cpi , -cpe HBL Associates 38 Radford Street Stone ST15 8DA Project Livingstone House, Brighton, BN3 3WZ Job Ref.

9 15/ Section Wind Pressure Calculations Sheet 4 Calc. by SL Date 08/05/2015 Chk'd by IT Date 08/05/2015 App'd by Date Zone Ext pressure coefficient, cpe Dynamic pressure, qs (kN/m2) External size factor, Cae Net Pressure, p (kN/m2) Area, Aref (m2) Net force, Fw (kN) A (-ve) B (-ve) C (-ve) D (-ve) Total vertical net force Fw,v = kN Total horizontal net force Fw,h = kN Walls load case 1 - Wind 0, cpi , -cpe Zone Ext pressure coefficient, cpe Dynamic pressure, qs (kN/m2)

10 External size factor, Cae Net Pressure, p (kN/m2) Area, Aref (m2) Net force, Fw (kN) A B wb wm wu l Overall LOADING Equiv leeward net force for upper section Fl =Fw,wl / Aref,wl Aref,wu = kN Net windward force for upper section Fw = Fw,wu = kN Overall LOADING upper section Fw,u = (1 + Cr) (Fw - Fl + Fw,h) = kN Equiv leeward net force for middle section Fl =Fw,wl / Aref,wl Aref,wm = kN Net windward force for middle section Fw = Fw,wm = kN Overall LOADING middle section Fw,m = (1 + Cr) (Fw - Fl) = kN Equiv leeward net force for bottom section Fl =Fw,wl / Aref,wl Aref,wb = kN Net windward force for bottom section Fw = Fw,wb = kN Overall LOADING bottom section Fw,b = (1 + Cr) (Fw - Fl)