RCL Wind Design

7/30/2019 RCL Wind Design

http://slidepdf.com/reader/full/rcl-wind-design 1/20

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 =







Reference OutputCALCULATIONS / DESCRIPTION

25-May-11

M Rampersad

236-001


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 =





Location Structural Frame Projec



25-May-11

M Rampersad

236-001


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








25-May-11

M Rampersad

236-001


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

of20








25-May-11

M Rampersad

236-001


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





Location Structural Frame Projec



25-May-11

M Rampersad

236-001


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



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



Clause 6.5.7

Return to top

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



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



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



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



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



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

,



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



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



ith V=135kph to 160kph



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

RCL Wind Design

Documents

Transcript of RCL Wind Design