wind loads calculation bs6399

Evo Design s.r.l. xxxx TOWER DESIGN REVIEW REPORT Location xxx WIND LOADS CALCULATION PER BS 6399-2 FOR A BASIC WIND SPEED OF 25 m/s ≔ V b 25 m m m m s s basic wind speed ≔ K b 1 building type factor in accordance with BS 6399-2 Table 1. for ramed building with structural walls arround lifts and stairs only (e.g. office buildings of open plan or without partitions) ≔ H r 30 m m m m Reference height ≔ H e H r Effective height to be considered in the calculations Basic wind speed calculation in accordance with BS 6399-2 Section 2.2.1 ≔ ∆ S 100 site altitude above sea level in meters - Section 2.2.2.2 ≔ S a + 1 ⋅ 0.001 ∆ S altitude factor = S a 1.1 ≔ S d 1 direction fac tor - Section 2.2. 2.3 for unknow n wind direction ≔ S s 1 seasonal factor - Section 2.2.2.4 ≔ S p 1 probability factor - Section 2.2.2.5 ≔ V s ⋅ ⋅ ⋅ ⋅ V b S a S d S s S p = V s 27.5 m m m m s s Effective wind speed calculation in accordance with BS 6399-2 Section 2.2.3 ≔ S b 1.96 terrain and building factor - Section 2.2.3.3 - Table 4 ≔ V e ⋅ V s S b = V e 53.9 m m m m s s effective wind speed for building heights larger that the width some reduction in wind loads may be obtained by dividing the building into a number of parts - in our case the reduction is neglijable. ≔ L 51 m m m m building length ≔ W 25 building width

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Evo Design s.r.l. xxxx TOWER

DESIGN REVIEW REPORT Location xxx

WIND LOADS CALCULATION PER BS 6399-2

FOR A BASIC WIND SPEED OF 25 m/s

Vb 25 mmmm

ssssbasic wind speed

Kb 1 building type factor in accordance with BS 6399-2 Table 1.for ramed building with structural walls arround lifts and stairs only (e.g. office buildings of open plan or without partitions)

Hr 30 mmmm Reference height

He Hr Effective height to be considered in the calculations

Basic wind speed calculation in accordance with BS 6399-2 Section 2.2.1

S 100 site altitude above sea level in meters - Section 2.2.2.2

Sa +1 0.001 S altitude factor

=Sa 1.1

Sd 1 direction factor - Section 2.2.2.3 for unknown wind direction

Ss 1 seasonal factor - Section 2.2.2.4

Sp 1 probability factor - Section 2.2.2.5

Vs Vb Sa Sd Ss Sp =Vs 27.5 mmmm

ssss

Effective wind speed calculation in accordance with BS 6399-2 Section 2.2.3

Sb 1.96 terrain and building factor - Section 2.2.3.3 - Table 4

Ve Vs Sb =Ve 53.9 mmmm

sssseffective wind speed

for building heights larger that the width some reduction in wind loads may be obtained by dividing the building into a number of parts - in our case the reduction is neglijable.

L 51 mmmm building length

W 25 building width
Evo Design s.r.l. xxxx TOWER

DESIGN REVIEW REPORT Location xxx

=L

He1.7 external pressure coeff. - longitudinal per BS 6399-2 -

Table 5

Longitudinal coefficients

Cpe.winward.L 0.749 interpolation - values in Table 5

Cpe.leeward.L 0.249

=W

He0.833

1

mmmmexternal pressure coeff. - transversal per BS 6399-2 -Table 5

Transversal coefficients

Cpe.winward.T 0.800 values in Table 5

Cpe.leeward.T 0.300

Ca.L 0.848 in accordance with BS 6399-2 Figure 4

Ca.T 0.816

Dynamic pressure per BS 6399-2 Section 2.1.2

qs 0.613

Ve

mmmm

ssss

2

PaPaPaPa in accordance with BS 6399-2 Formula 1

=qs 1.781 10

3 PaPaPaPa

pe.winward.L qs Cpe.winward.L Ca.L in accordance with BS 6399-2 Formula 2

=pe.winward.L 1.131 kPakPakPakPa

pe.leeward.L qs Cpe.leeward.L Ca.L in accordance with BS 6399-2 Formula 2

=pe.leeward.L 0.376 kPakPakPakPa
Evo Design s.r.l. xxxx TOWER

DESIGN REVIEW REPORT Location xxx

pe.winward.T qs Cpe.winward.T Ca.T in accordance with BS 6399-2 Formula 2

=pe.winward.T 1.163 kPakPakPakPa

pe.leeward.T qs Cpe.leeward.T Ca.T in accordance with BS 6399-2 Formula 2

=pe.leeward.T 0.436 kPakPakPakPa