rcl wind design
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7/30/2019 RCL Wind Design
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CLIENT W RATTAN Date
PROJECT Lot #12, Calcutta Settlement Road, Freeport By
Location Structural Frame Project
Sub-Location Frame Analysis
Reference Output
STRUCTURE GEOMETRY
Total height, hn 6.86 m
Breadth of structure (normal to wind), B 14.12 m
Length of structure (parallel to wind), L 30.58 m
Main Frame component Steel
Basic Wind speed to be used 61 m/s
PAHO Guide Basic Wind speed to be used 220 km/hr
Diameter D m
Protruding elements, D' m
Headroom between ground and underside, Hb 0.00 m
Period of structure, T
12.8.2.1 T=CThn0.75
0.0853
0.881 seconds
Natural frequency of structure, n1 [1/T]= 1.135 Hz
If n 1 <1Hz, structure is flexible, if >1Hz then rigid.
\ Type of structure = Rigid
WIND MODELLING DATA
Claus e 6.5.2 Surface roughness
B
Claus e 6.5.4.4 Wind directionality factor, Kd
0.85
Claus e 6.5.5 Importance factor, I
Category I 0.77
Region:
Claus e 6.5.6.3 Exposure class
B
Buildings - Main wind force resisting system
CALCULATIONS / DESCRIPTION
numerical coefficient, Ct =
B-Hurricane-prone regions with V > 160kph
Section 6.2
definit ion
25-May-11
M Rampersad
236-001
B | Urban / Suburban / Wooded areas or others with closely
spaced obstructions having the size of a single family dwelling or
larger
Structure
geometry
All references are to ASCE7-05 unless noted otherwise
B | Where surface roughness B prevails upwind for 800m or 10 x
[structure height], whichever is the greater.
Period of Structure, T =
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CLIENT W RATTAN Date
PROJECT Lot #12, Calcutta Settlement Road, Freeport By
Location Structural Frame Project
Sub-Location Frame Analysis
Reference OutputCALCULATIONS / DESCRIPTION
25-May-11
M Rampersad
236-001
All references are to ASCE7-05 unless noted otherwise
Claus e 6.5.6.6 Velocity pressure exposure coefficient, KH
Table 6.3
Case_B1
0.7
Claus e 6.5.6.6 Velocity pressure exposure coefficient, KZ
Table 6.3 Note 2 Z= 6.86 m
zg = 365.8 m
For 4.6m<z<zg, KZ = 2.01(z/zg)
2/a
KZ = 0.645
Basic wind speed, v
61.0 m/s
136.5 mph
Claus e 6.5.7 Topographic factor, Kzt
No
No
No
No
No
KZT = (1+K1K2K3)2
Ignore topographic effects
Kzt [Topographic facto 1.00
Is H/L h ≥ 0.2?
Does the hill protrude more than twice the height of any upwind terrain fatures within a 3.22km radiu
KH =
Is H > 4.5m for exposure Class [C] and [D] and or 18m for [B]?
Is the structure isolated/unobstructed on a hill, escarpment for 100 times the height of the st ructure
Is the structure located as shown in Fig 6.4 (upper half of a hill or near the crest of an escarpment?
1 - All components & cladding PLUS MWFRS in low-rise bldgsCase of exposure =
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CLIENT W RATTAN Date
PROJECT Lot #12, Calcutta Settlement Road, Freeport By
Location Structural Frame Projec
Sub-Location Frame Analysis
Reference OutputCALCULATIONS / DESCRIPTION
25-May-11
M Rampersad
236-001
All references are to ASCE7-05 unless noted otherwise
Type of hill: A-2D HillLh (m) 100.0
H (m) 3.0
x (m) 0.5
z (m) 0.5
H/Lh 0.0
x/Lh 0.0
z/Lh 0.0
K1 0.0 Accounts for the shape of the topographic feature
K2 1.0 Accounts for the location of the structure from the crest
K3
1.0 Accounts for the structure height
GUST EFFECT FACTORS
Clause 6.5.8.1 Rigid Structure
gQ 3.4
Clause 6.5.8.1 gV 3.4
Terrain exposure constants
For exposure Class B:
a zg (ft) â c l (ft) zmin (ft)
Table 6.2 7 1200 0.143 0.84 0.25 0.45 0.3 320 0.333 30
Ž = 30.00 ft
IŻ = 0.305
LŽ = 310.0 ft
Clause 6.5.8.1 Background Response, Q
0.947
2.668
2.762
0.894
Flexible Structure
Basic wind speed,V 136.5 mph
0.25 ā
Ž = 30.00
0.45
Mean hourly wind speed, VZ (mph)
Eqn 6.14 VZ = 175.9 mph
Figure 4 for
topograhpic
factor K ZT
Gust effect factor, G=
1+(1.7gQIZQ) =
1+(1.7gvIZ) =
Q=
bˆ a b
61
33
7.11
7.11925.0
Z c I
I g
Q I g G
Z
Z V
Z Q
63.0
63.01
1
Z L
h B
Q
a
b
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CLIENT W RATTAN Date
PROJECT Lot #12, Calcutta Settlement Road, Freeport By
Location Structural Frame Project
Sub-Location Frame Analysis
Reference OutputCALCULATIONS / DESCRIPTION
25-May-11
M Rampersad
236-001
All references are to ASCE7-05 unless noted otherwise
Peak factor for resonant response, gR
Clause 6.5.8.2
2 ln 3600n1 = 16.63
gR= 4.220
Eqn 6.12 Reduced frequency, N1
N1 = 2.000
Eqn 6.11 RN
RN = 0.09
Eqn 6.13a General equation for Rl
For Rl=RH
h 0.204
RH= 0.877
For Rl=RB
h 0.030
RB= 0.981
For Rl=RL
h 8.785
RL= 0.107
Damping ratio, b
Use b = 5.0%
1
13600ln2
577.03600ln2
nn g R
Z
Z
V
Ln N
1
1
35
1
1
3.101
47.7
N
N R
N
Z V hn16.4h
h
h h
2
21
2
11 e Rl
Z V n /6.4 1h
Z V Ln14.15h
Page 4 of20
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CLIENT W RATTAN Date
PROJECT Lot #12, Calcutta Settlement Road, Freeport By
Location Structural Frame Project
Sub-Location Frame Analysis
Reference OutputCALCULATIONS / DESCRIPTION
25-May-11
M Rampersad
236-001
All references are to ASCE7-05 unless noted otherwise
Eqn 6.10 Resonant Response factor, R
R = 0.944
gQ2Q
2= 10.36
gR2R
2= 15.85
(1+1.7IŽ√gQ2Q
2) = 3.653
(1+1.7gvIŽ) = 2.762
Gust effect factor for flexible structures, G f
Gf = 1.223
Clause 6.5.10 Velocity Pressure, qz
qz=0.613KZKZTKDV2I
qz= 96.34 N/m2
Clause 6.5.9 Enclosure Classification
Clause 6.5.11 Pressure & Force Coefficients
Clause 6.5.11.1 Internal Pressure coefficient, GCpi
Clause
6.5.11.1.1 Reduction factor for large volume R i
2961 m3
###### ft3
18 m2
194 ft2
Ri = 0.994
Use lesser of Ri=1.0 or Ri calculated
\ Use Ri = 0.994
Clause 6.5.11.2 External Pressure coefficient, GCpf
Clause 6.5.13 Force = qzGCf Af
D/D' = Moderately smooth
h/D = 1.00
Average D√qz =
Cross-section
1.300
Square (wind normal to face)
Total area of openings in
the building, AOG =
Unpartitioned internal
volume, Vi =
L Bhn
R R R R R 47.053.01
b
OG A
Vi Ri
800,221
115.0
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CLIENT W RATTAN Date
PROJECT Lot #12, Calcutta Settlement Road, Freeport By
Location Structural Frame Projec
Sub-Location Frame Analysis
Reference OutputCALCULATIONS / DESCRIPTION
25-May-11
M Rampersad
236-001
All references are to ASCE7-05 unless noted otherwise
Z (ft) Z (m) Kzqz
kN/m2
D√qz F (kN)M
(kNm)
0.00 0.00 0.57 858
5.00 1.52 0.59 880
10.00 3.05 0.72 1,073
15.00 4.57 0.81 1,205
20.00 6.10 0.88 1,308
25.00 7.62 0.93 1,394
30.00 9.14 0.98 1,469
35.00 10.67 1.03 1,535
h
Hb>=0
z 2
z 1
z 3
e t c .
z
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Simplified Procedure
Reference
ASCE 07
Fig 6.1 Basic wind speed (V)
Tbl 6-1, Tbl 1-1 Importance Factor (I)
6.5.6 Exposure category
Fig 6.2
Height & exposure adjustment
coefficient (l)
Fig 6.2
Simplified wind pressure for
exposure B (ps30)
Simplified wind pressure (ps) 0
Hard Rock
Exposure Section 1616
B Terrain with buildings, forest or surface irregularities covering at least 20% of the ground le
C Terrain that is f lat and generally open, extending 0.8km or more from the site from any qua
D Most severe exposure areas with basic wind speeds exceeding 129 km/h
Table 16-G: Combined height, exposure and gust factor coefficient Ce
Height above aveExposure B Exposure Exposure D
0.00 0.62 1.06 1.39
4.57 0.62 1.06 1.39
6.10 0.67 1.13 1.45
7.62 0.72 1.19 1.50
9.14 0.76 1.23 1.54
12.19 0.84 1.31 1.62
18.29 0.95 1.43 1.7324.38 1.04 1.53 1.81
30.48 1.13 1.61 1.88
36.58 1.20 1.67 1.93
48.77 1.31 1.79 2.02
60.96 1.42 1.87 2.10
91.44 1.63 2.05 2.23
121.92 1.80 2.19 2.34
Seismic code
NUMERICAL COEFFICIENT, Ct
Other 0.0488
Reinforced Concrete 0.0731
Steel 0.0853
Table 6.2 Exposure a zg (ft) â
B 7 1200.00 0.1429 0.84 0.25
C 9.5 900.00 0.1053 1.00 0.15
D 11.5 700.00 0.0870 1.07 0.11
0
0.5
1
1.5
2
2.5
0
bˆ a
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Clause 6.5.7
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H/Lh A-2D Hill B-EscarpC-3D
Axisymm
x/Lh A-2D Hill
0.00 0.00 0.00 0.00 0.00 1.00
0.10 0.13 0.08 0.10 0.00 1.00
0.20 0.26 0.15 0.19 0.00 1.00
0.23 0.29 0.17 0.21 0.25 0.94
0.25 0.33 0.19 0.24 0.50 0.88
0.28 0.36 0.21 0.26 0.75 0.82
0.30 0.39 0.23 0.29 1.00 0.75
0.33 0.42 0.24 0.31 1.25 0.69
0.35 0.46 0.26 0.33 1.50 0.63
0.38 0.49 0.28 0.36 1.75 0.57
0.40 0.52 0.30 0.38 2.00 0.50
0.43 0.55 0.32 0.40 2.25 0.44
0.45 0.59 0.34 0.43 2.50 0.38
0.48 0.62 0.36 0.45 2.75 0.32
0.50 0.65 0.38 0.48 3.00 0.25
0.60 0.78 0.45 0.57 3.50 0.13
B 1.30 0.75 0.95 4.00 0.00
C 1.45 0.85 1.05
D 1.55 0.95 1.15
K1 multiplier
Topographic mu l t ip l iers for Exposure [C]
K2 mul
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C lause 6.5 .6 .2 Su rface roughness
B | Urban / Suburban / Wooded areas or others with closely spaced obstructions having t
C | Open terrain with scattered obstructions generally with heights less than 9.1m. This in
D | Flat unobstructed areas and water surfaces outside hurricane-prone regions
Clause 6 .5 .6 .3 Exposure ca tegories
B | Where surface roughness B prevails upwind for 800m or 10 x [structure height], whic
C | Open terrain with scattered obstructions generally with heights less than 9.1m. This in
D | Where surface roughness D prevails upwind for 1500m or 10 x [structure height], whi
Clau se 6.5.4.4 Wind d i rect ional ity factor K d
Buildings - Main wind force resisting system 0.85
Buildings - Components and cladding 0.85
Arched roofs 0.85
Chimneys Tanks & similar structures - Square 0.90
Chimneys Tanks & similar structures - Hexagonal 0.95
Chimneys Tanks & similar structures - Round 0.95
Solid Signs 0.85
Open signs & Lattice framework 0.85
Trussed towers - Triangular, square and rectangular 0.85
Trussed towers - All other cross sections 0.95
Cl au se 6.5.5 Imp or tan ce f ac to r, I
C lause 6 .5 .6 .6 Veloc ity pressure exposure coe ff i c ien ts , K H
Table 6.3 Height above ground level (m) B1 B2 C12 D12
4.60 0.70 0.57 0.85 1.03 1 - All co
6.10 0.70 0.62 0.90 1.08 2 - All M
7.62 0.70 0.66 0.94 1.12
9.14 0.70 0.70 0.98 1.16
Exposure
Return to top
Return to top
Buildings and other structures that represent a substantial hazard to human life in the event
Buildings and other structures designated as essential facilities including, but not limited to:
All buildings and other structures except those listed in Categories I, III, and IV
Return to top
Return to top
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12.19 0.76 0.76 1.04 1.22
15.24 0.81 0.81 1.09 1.27
18.29 0.85 0.85 1.13 1.31
21.34 0.89 0.89 1.17 1.34
24.38 0.93 0.93 1.21 1.38
27.43 0.96 0.96 1.24 1.40
30.48 0.99 0.99 1.26 1.43
36.58 1.04 1.04 1.31 1.48
42.67 1.09 1.09 1.36 1.52
48.77 1.13 1.13 1.39 1.55
54.86 1.17 1.17 1.43 1.58
60.96 1.20 1.20 1.46 1.61
76.20 1.28 1.28 1.53 1.68
91.44 1.35 1.35 1.59 1.73
106.68 1.41 1.41 1.64 1.78
121.92 1.47 1.47 1.69 1.82
137.16 1.52 1.52 1.73 1.86
152.40 1.56 1.56 1.77 1.89Case 1 - All components & cladding
Figure 6-5 Enclosure Classification GCpi
Open Buildings 0.00
Partially Enclosed buildings (+) 0.55
Partially Enclosed buildings (-) -0.55
Enclosed Buildings (+) 0.18
Enclosed Buildings (-) -0.18
Figure 6-19 Force coefficients, CF
Chimney, tanks rooftop equipment etc. 1 2 3
Hexagonal or Octagonal 1.000 1.033 1.067
Round (D√qz < 5.3) 0.700 0.717 0.733
Round (D√qz >5.3) moderately smooth (D'/D=0.00) 0.500 0.517 0.533
Round (D√qz >5.3) rough (D'/D=0.02) 0.700 0.717 0.733
Round (D√qz >5.3) very rough (D'/D=0.08) 0.800 0.833 0.867
Square (wind along diagonal) 1.000 1.017 1.033
Square (wind normal to face) 1.300 1.317 1.333
Figures in red
indicate those
obtained from
Code. Other
figures are
interpolated as
allowed
Surface type
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el area extending 1.6km or more from the site B | Terrain with buildings, forest or surfa
rant C | Terrain that is flat and generally open
D | Most severe exposure areas with ba
B | Terrain with buildings, forest or surfa
c l (ft) zmin (ft)
0.45 0.30 320.00 0.33 30.00
0.65 0.20 500.00 0.20 15.00
0.80 0.15 650.00 0.13 7.00
20 40 60 80 100 120 140
Exp B
Exp C
Exp D
b
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B-EscarpC-3D
Axisymm
z/Lh A-2D Hill B-EscarpC-3D
Axisymm1.00 1.00 0.00 1.00 1.00 1.00
1.00 1.00 0.00 0.99 1.00 0.99
1.00 1.00 0.00 1.00 1.00 1.00
0.84 0.94 0.05 0.86 0.88 0.82
0.67 0.88 0.10 0.74 0.78 0.67
0.50 0.82 0.15 0.64 0.69 0.55
0.33 0.75 0.20 0.55 0.61 0.45
0.17 0.69 0.25 0.47 0.54 0.37
0.00 0.63 0.30 0.41 0.47 0.30
0.00 0.57 0.35 0.35 0.42 0.25
0.00 0.50 0.40 0.30 0.37 0.20
0.00 0.44 0.45 0.26 0.32 0.17
0.00 0.38 0.50 0.22 0.29 0.14
0.00 0.32 0.55 0.19 0.25 0.11
0.00 0.25 0.60 0.17 0.22 0.09
0.00 0.13 0.70 0.12 0.17 0.06
0.00 0.00 0.80 0.09 0.14 0.04
0.90 0.07 0.11 0.03
1.00 0.05 0.08 0.02
1.50 0.01 0.02 0.00
2.00 0.00 0.01 0.00
iplier K3 multiplier
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he size of a single family dwelling or larger
cludes flat open land, grasslands, and all water surfaces in hurricane-prone regions
ever is the greater.
cludes flat open land, grasslands, and all water surfaces in hurricane-prone regions
hever is the greater. Exp D applies inland from the shoreline for a distance of 200m or 10 x [structure height]
A-Non-hurricane prone regions and hurricane-prone regions
B-Hurricane-prone regions with V > 160kph
I 0.87 0.77
II 1.00 1.00
III 1.15 1.15
IV 1.15 1.15
ponents & cladding PLUS MWFRS in low-rise bldgs
FRS except low-rise PLUS Other systems
A-Non-hu B-Hurrica
of failure including, but not limited to
,
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0.7
4 5 6 7 8 9 10 11 12 13 14
1.100 1.133 1.167 1.200 1.211 1.222 1.233 1.244 1.256 1.267 1.278
0.750 0.767 0.783 0.800 0.822 0.844 0.867 0.889 0.911 0.933 0.956
0.550 0.567 0.583 0.600 0.606 0.611 0.617 0.622 0.628 0.633 0.639
0.750 0.767 0.783 0.800 0.806 0.811 0.817 0.822 0.828 0.833 0.839
0.900 0.933 0.967 1.000 1.011 1.022 1.033 1.044 1.056 1.067 1.078
1.050 1.067 1.083 1.100 1.122 1.144 1.167 1.189 1.211 1.233 1.256
1.350 1.367 1.383 1.400 1.433 1.467 1.500 1.533 1.567 1.600 1.633
h/D
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e irregularities covering at least 20% of the ground level area extending 1.6km or more from the site
, extending 0.8km or more from the site from any quadrant
ic wind speeds exceeding 129 km/h
e irregularities covering at least 20% of the ground level area extending 1.6km or more from the site
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ith V=135kph to 160kph
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15 16 17 18 19 20 21 22 23 24 25
1.289 1.300 1.311 1.322 1.333 1.344 1.356 1.367 1.378 1.389 1.400
0.978 1.000 1.022 1.044 1.067 1.089 1.111 1.133 1.156 1.178 1.200
0.644 0.650 0.656 0.661 0.667 0.672 0.678 0.683 0.689 0.694 0.700
0.844 0.850 0.856 0.861 0.867 0.872 0.878 0.883 0.889 0.894 0.900
1.089 1.100 1.111 1.122 1.133 1.144 1.156 1.167 1.178 1.189 1.200
1.278 1.300 1.322 1.344 1.367 1.389 1.411 1.433 1.456 1.478 1.500
1.667 1.700 1.733 1.767 1.800 1.833 1.867 1.900 1.933 1.967 2.000
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