Wind Assessment to AS1170.2

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REF.:

CONSULTING ENGINEERS

Tel : ????  PAGE:

????

Fax :????  DATE:

????

email: ????  DESIGN:

31-Jan-2012

SCH

ASSESSMENT OF DESIGN WIND WI ND SPEED Site Address : ?? ??

Description: Residential to Open (depending direction) Partial to zero shielding (depending direction)

T C3/T C2.5 PS/NS

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Topography

T1

Building Risk Assessment Assessment

Average Building Height = h[avg] = h =

Building Co Code of Au Australia (B (BCA)

Part B1 B1 St Structural Pr Provisions

ST RUCTURAL CATEGORY

Importance Level

Annual pr probability of De Des ig ign W in ind Ev Event be being ex exc e ee eded A

(max.)

Table B1.2a

0.002 R = Mean Re Return Pe Period

SubRegion

1 Region

A1

Non-Cyclonic

C[dyn] =

1

46/ht =

9.93

N

NE

E

SE

S

SW

W

NW

0

45

90

135

180

225

270

315

Tcat

2.5

2.5

3

3

3

3

3

V[R,u] = M[d] = M[z,cat] = M[s] = M[t] = M[z,cat].M[s].M[t] = V[sit,β V[sit,β,u] =

45 0.90 0.87 1.00 1.00 0.87 35.24

45 0.80 0.87 1.00 1.00 0.87 31.32

45 0.80 0.83 1.00 1.00 0.83 30.00

45 0.80 0.83 0.95 1.00 0.79 30.00

45 0.85 0.83 0.95 1.00 0.79 30.16

45 0.95 0.83 0.95 1.00 0.79 33.71

45 1.00 0.83 0.95 1.00 0.79 35.48

V[sit,β V[sit,β ,u] =

Maximum Expected wind speed at SITE for strength limit state =

37.1 37.19 9 m/s m/s

ASSESSMENT OF BUILDING BUILDING ORIENTATION AlternateValue 360 Bearing of Northern Most Face -19 (degrees from North, less than 90°) Building Face 1 2 3 Face Bearing -19 71.0 161 Sector Bdry 296 26 26 116 116 V[sector] = 37.19 32.97 32.21

Θ

0 37.19 0.83

V[des,Θ V[des,Θ,u] = q[ref] = q[ref] = (0.5

500

AS1170.2:2002

sensitivity {static analysis acceptable} Use Directional Wi Wind Sp Speeds TRUE

β

2 {Normal}

f or or St Strength 1/500 =

ASSESSMENT OF SIT E AND BUILDING BUILDING HEIGHT Major Region

4.633 m

90 32.97 0.65

degrees 2.5

45 m/s 0.95 0.87 1.00 1.00 0.87 37.19 m/s relative to building

Orientation known 0 4 251 degrees 206 296 degrees 36.47 m/s

206

180 32.21 0.62

270 36.47 0.80

degrees m/s kPa

ρ[air] ) V[des,Θ V[des,Θ,u]² Strength Limit State Design simplified to two orthogonal directions: V[des,0,u] = 37.1 37.19 9 m/s m/s V[des,90,u] = 36.47 m/s

V[site] to V[design] 60.00 50.00 40.00 30.00 20.00 10.00 0.00

qz0 = qz90 =

0

45

90

135

180

Site

225

270

315

0.83 kP kPa 0.80 kP kPa

360

Design

Maximum Design wind speed for Building for strength limit state =

V[des,Θ V[des,Θ,u] =

37.1 37.19 9 m/s m/s

Vp =

30.4

Classification of Wind Loading To AS4055: Upper wind Class

N2

W P33, W U40

Lower wind Class

N1

WP28, WU34

NB: The Lower wind class is only relevant for pre-engineered structures designed to the AS1170 wind speed calculated above, and is therefore designed to a lower wind speed than the AS4055 classification of the site would require: the upper wind class shown above. (eg. An AS4055 classified N2 building is not suitable for a N3 site. But the AS1170 AS1170 designed building is suitable for the AS1170 AS1170 assessed site.) (C)Roy Harrison Associates

schW indAssessment_r02.xls

W indSpeed