WIND LOADING: AS/NZS 1170.2:2002
1. Project Description & Definition
Project :
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VR = Regional wind speeds for all directions bad on 3 cond gust wind data
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R = average recurrence interval, inver of the annual probability of exceedaance
Md= Wind direction Multiplier
Mz,cat = Terrain/Height multiplier
Ms = Shielding Multiplier
Mt = Topographic Multiplier
Vsit,b = Site wind speeds defined for the 8 cardinal directions ( b )
p= Design Wind Pressures in Pa
Cfig = aerodynamic shape factor
Cdyn= dynamic respon factor
2. Regional Wind Speeds (V R)
Average recurrence interval R =500years
From Table 3.1, Regional Wind Speed V R =45m/s
2. Wind Direction Multiplier
Location:Central Melbourne
Region:A5
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See Table 3.2
Note: 1. For region B, C, D, Md for all direction is 0.95 for stability and main frame
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2. For region C and D, include additional factor Fc and FD, e item
3.4
4. Terrain/Height Multiplier (Mz,cat)
Terrain Category : 2.5(e note below)
Height z =8.6m
Terrain/Height Multiplier Mz,cat=0.9348See Table 4.1
Note:Category 1: Expod open terrain with few or no obstruction/water surfaces
Category 2: Open terrain, grassland with few, well scattered obstruction
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having height between 1.5 m to 10 m
Category 3: Terrain with numerous cloly spaced obstruction 3-5 m high
such as areas of suburban housing
Category 4: Terrain with numberous large, high (10-30 m high) & cloly
spaced obstrution, as large city center, well dev. Industry complex.
5. Shielding Multiplier (Ms)
Average roof height of shielding buildings hs =5m
Average breadth of shiedling building normal to wind stream bs=100m
Average roof height above ground of the struct being shielded h=8.6m助学金申请表
Number of upwind shiedling building withn 45 deg ctor and
radius of 20 h =172m with hs >= h ns =5
Average spacing of shielding buildings ls = h [ 10/ ns + 5] =60.2m
Shielding Parameter s= ls / V (hs.bs) = 2.7
Refer to Table 4.3, Shielding Multiplier Ms =1
5. Topographic Multiplier (Mt)
共度好时光作文600字>革命气节歌Mt is the larger of Mh and Mlee, e ction 4.4Mt = 1.0
6. Site Wind Speed Vsit,b =V R.Md (Mz,cat.Ms.Mt)
7. Design Wind Pressure (witout Cfig and Cdyn)p = ( 0.5 r air) [Vdes,q]2
U Design Wind pressure of pu = 1.06kPa For NORTH Direction
U Design Wind pressure of pu = 1.06kPa For EAST Direction
U Design Wind pressure of pu = 1.06kPa For SOUTH Direction
