WIND CLASSIFICATION DESIGN GUIDE 100km Normal REGION A REGION B Intermediate Brisbane Graon Maryborough Corindi Coffs Harbour Coffs
Bundaberg 50km Tropical Cyclones Rockhampton REGION C Sydney Casino Mackay Bowen Minto Glen Innis Bilocla Toowoonba Townsville Cairns Canberra Cooktown Emerald Hobart Moreton McDonnel Atherton Melbourne Dunbar Collinsville Weipa Adelaide Normal REGION A West Moreland West Normal REGION A Alice Springs Adelaide River Adelaide Katherine Ivanhoe Darwin Wyndham Derby Marble Bar Broome Millstream Morawa Perth Gunyidi Mullewa 50km Callathard Gascoyne Junction Tropical Cyclones REGION C Mt Amy Port Headland Port Carnarvon Croydon Geraldton Green Head Green Onslow A - Normal - 100kms B - Intermediate - 50kms Cyclones C - Tropical Cyclones Tropical D - Severe Severe Tropical
Cyclones REGION D o o o 100km 30 25 20
REGION B REGION Intermediate the Region, the Terrain Category, a Shielding Factor and the Topography. a Shielding Factor Category, Terrain the the Region, is based This information only. structures guide for residential as an approximate is to be used This information to the Australian refer For a detailed analysis wind load for housing. AS4055-2012, Standard on the Australian AS/NZS1170.2:2011. Standard wider than 16m and 8.5m high. high and no only suitable for houses up to 2 storeys This approach is Region 1. Wind Step location. dwelling based on the Choose your wind region
To determine the wind classification for your domestic building site you must consider 4 factors: you must building site for your domestic the wind classification To determine SELECTION PROCESS - 5 STEP GUIDE 5 STEP - PROCESS SELECTION
WIND CLASSIFICATION 2 light industrialestates”. 10 house-size obstructionsperhectare, e.g. “suburban housing, density ofobstructionsshallbeatleasttheequivalent having heightsgenerally from3mto10m.Theminimum Terrain withnumerouscloselyspacedobstructions CATEGORY 3 – TC3 acreage development withfewer than10buildingsperhectare. in developing outer urbanareas withscattered houses,orlarge intermediate between TC2 andTC3 andrepresents theterrain Terrain withafew trees orisolated obstructions.Thiscategory is CATEGORY 2.5 – TC2.5 with isolated trees anduncutgrass. obstructions perhectare, e.g. farmland andcleared subdivisions having heightsgenerally from1.5mto5mwithnomore thantwo Open terrain includinggrassland withwell-scattered obstructions CATEGORY 2 – TC2 in thewinddirection. oceans, lakes andenclosedbays extending greater than10km e.g. near-shore water, largeunenclosedbays onseasand Open water surfaces subjected toshoaling waves, CATEGORY 1.5 – TC1.5 extending less than10kminthewinddirection. grassed plains,orriver, canals,lakes andenclosedbays, enclosed limited sized water surfaces, e.g. flat,treeless, poorly Very exposed openterrain withfew ornoobstructionsand CATEGORY 1 – TC1 housing site. the surface roughness ofthesurroundingarea 500mfromthe Determine yourterrain category. Theterrain category describes Step 2.Terrain Category
TERRAIN CATEGORY 2 TERRAIN CATEGORY 1.5 TERRAIN CATEGORY 2.5 TERRAIN CATEGORY 3 TERRAIN CATEGORY 1 WATER WIND TC 2.5 TC 1.5 TC 2 TC 3 TC 1
3 WIND CLASSIFICATION FS PS NS
THIS HOUSE
THIS HOUSE
THIS HOUSE WIND WIND WIND NO SHIELDING PARTIAL SHIELDING PARTIAL FULL SHIELDING NO SHIELDING – NS – SHIELDING NO or no permanent obstructions are there No shielding where such as than 2.5 obstructions per hectare, less are there where single houses. of houses or the row PARTIAL SHIELDING – PS – SHIELDING PARTIAL or a least 2.5 houses, trees are there shielded where Partially type suburban development such as acreage sheds per hectare as classified of houses are or wooden parkland. The second row partially shielded. FULL SHIELDING – FS – SHIELDING FULL of houses or similar size at least two rows Full shielding where surround the house being considered. permanent obstructions within 100m of site wooded areas A & B, heavily In Regions of roads or other open areas The effects full shielding. provide shall be ignored. direction in any measured than 100m with less than greater suburban development Full shielding is for typical abutting of houses two rows The first 10 houses per hectare. 100m, than greater with a least dimension permanent open areas and airfields, shall be of water expanses such as parklands, large or no shielding. either partial shielding to have considered Step 3. Shielding Factor Shielding 3. Step describes category The terrain category. your terrain Determine from the 500m area of the surrounding roughness the surface housing site.
WIND CLASSIFICATION 4 H =heightofthehill,ridgeorescarpment(m) less thana1in20riseminimalslopewouldbeclassed asT0. The bottom ofthehillisconsidered very flatoriftheslopeis designated tobeT5. wind hasonthedwelling duetoitspositiononthehill, The topographic classification isdetermined bytheeffect the Step 4.Topography Effect Cliff ≥ Big Hill ≥ Medium Hill ≥ Small Hill ≥ Flat ≥ Very Flat ≤ Maximum Slopes 1:20 1:3 1:5 to 1:7.5 to 1:10 to 1:20 to
≤ ≤ ≤ 1:3 ≤ 1:7.5 1:10 1:5 1:5
Lower Third Location OnHill(Zone) T0 T0 T0 T0 T0 T0 Mid Third
T2 T2 T0 T0 T1 T1 H<10m Top Third top ofthehillwindpressures dropdown. greater than1in3andhasthemaximumofT5at top.Over the regardless ofwhere thedwelling ispositioned.Acliffaslopeof The maximumslopeismeasured atthesteepest part ofthehill T3 T2 T2 T0 T1 T1 10m
5 WIND CLASSIFICATION N/A N/A N/A N/A N/A N/A N/A N/A N/A C4 N6 N6 N6 N5 N5 N5 N5 N4 N4 N4 NS T5 N/A N/A N/A N/A N/A N/A N/A C4 C4 C3 N6 N5 N5 N5 N4 N4 N4 N4 N4 N3 NS T4 N/A N/A N/A N/A C4 N/A C4 C4 C3 C3 N5 N5 N5 N4 N4 N4 N4 N3 N3 N3 NS N/A N/A N/A C4 C4 C4 C4 C3 C3 C3 N5 N5 N4 N4 N4 N4 N3 N3 N3 N3 PS T3 86 74 61 50 86 74 61 50 40 34 Ultimate N/A N/A N/A C4 C4 C4 C4 C3 C3 C3 N5 N4 N4 N4 N4 N4 N3 N3 N3 N2 NS N/A N/A C4 C4 C4 C4 C3 C3 C3 C2 N5 N4 N4 N4 N3 N3 N3 N3 N3 N2 PS N/A C4 C4 C3 C3 C3 C3 C2 C2 C2 N4 N4 N3 N3 N3 N3 N3 N2 N2 N2 FS T2 N/A N/A C4 C4 C3 C3 C3 C3 C2 C2 N4 N4 N4 N3 N3 N3 N3 N3 N2 N2 NS 55 47 39 32 55 47 39 32 26 26 Limit state design gust wind speed (m/s) Limit state Serviceability N/A C4 C4 C3 C3 C3 C3 C2 C2 C2 N4 N4 N3 N3 N3 N3 N3 N2 N2 N2 PS C4 C4 C3 C3 C2 C3 C2 C2 C2 C1 N4 N3 N3 N3 N2 N2 N2 N2 N1 N1 FS T1 C4 C4 C4 C3 C3 C3 C3 C2 C2 C2 N4 N4 N3 N3 N3 N3 N2 N2 N2 N1 NS C4 C4 C3 C3 C3 C3 C2 C2 C2 C1 N4 N3 N3 N3 N2 N3 N2 N2 N1 N1 PS W70C W60C W50C W41C W70 W60 W50 W41 W33 W28 Common Notation Common C3 C3 C3 C2 C2 C2 C2 C1 C1 C1 N3 N3 N2 N2 N2 N2 N2 N1 N1 N1 FS Topographic class Topographic T0 1 1.5 2 2.5 3 1 1.5 2 2.5 3 1 1.5 2 2.5 3 1 1.5 2 2.5 3 Terrain Terrain Category D C B A Wind region C4 C3 C2 C1 N6 N5 N4 N3 N2 N1 Wind Class Wind Legend: FS = Full shielding shielding PS = Partial NS = No shielding N = Non-cyclonic C = Cyclonic 2011. to AS1170.2: refer N/A = Not Available, Note: N1~N6 are non-cyclonic wind classes, C1~C4 are cyclonic wind classes. C1~C4 are wind classes, non-cyclonic N1~N6 are Note: Step 5. Wind Classification Wind 5. Step AS4055-2012 FROM SYSTEM CLASSIFICATION WIND HOUSING FOR LOAD WIND & C1~C4. The N1~N6 classes -2012 sets out 10 wind AS4055 category, terrain of wind region, is a combination classification wind appropriate the determining By topography. shielding and and other design aids to design AS4055 the user can use class, for wind load accordingly. dwelling or parts of dwelling
WIND CLASSIFICATION 6 AROUND AUSTRALIA EXAMPLES OF THE WIND CLASSIFICATION FOR CITIES 4) EstablishtheTopography ofyourarea. (Section4) 3) Selectthetypeofshieldingyoursite has.(Section3) 2) Determine theappropriate Terrain Category. (Section 2) 1) ChooseyourWind Region basedonyourdwelling location.(Section1) 7 6 5 4 3 2 1 -suburbsnearbeach -flat Karratha, Dampier, CarnarvonWA insuburbs Broome, WA insuburbs-flat -onacreage -flat -flatawayfromthebeach Hervey Bay, Cairns&Darwininthesuburbs -ontopofasteep hill -flat Brisbane inthesuburbs -ontopofahill -flat Melbourne, Hobart,Adelaide &Perth inthesuburbs -ontopofasteep hill/cliffatbeach -onacreage Sydney inthesuburbs-flat House intheSuburbs-flat Place D C C B A A D C B A Region TC1.5 TC1.5 TC1.5 TC2.5 TC3 TC3 TC3 TC3 TC1.5 TC2.5 TC3 TC3 Category Terrain NS FS FS NS FS NS FS NS FS NS NS FS FS Shielding T0 T1 T1 T1 T5 T1 T3 T1 T5 T1 T1 T1 Topography C4 C3 C2 C2 C1 N5 N2 N3 N1 N5 N2 N1 C2 C1 N2 N1 Wind Class W70C W60C W50C W50C W41C W60 W33 W41 W28 W60 W33 W28 W50C W41C W33 W28 Notation Common
7 WIND CLASSIFICATION PRODUCT DESCRIPTIONS • All descriptions, specifications, illustrations, drawings, data, dimensions and weights contained in this catalogue, all technical literature and websites containing information from Lysaght are approximations only. They are intended by Lysaght to be a general description for information and identification purposes and do not create a sale by description. Lysaght reserves the right at any time to:
(a) supply Goods with such minor modifications from its drawings and specifications as it sees fit; and (b) alter specifications shown in its promotional literature to reflect changes made after the date of such publication.
DISCLAIMER, WARRANTIES AND LIMITATION OF LIABILITY • This publication is intended to be an aid for all trades and professionals involved with specifying and installing Lysaght products and not to be a substitute for professional judgement. • Terms and conditions of sale available at local Lysaght sales offices. • Except to the extent to which liability may not lawfully be excluded or limited, BlueScope Steel Limited will not be under or incur any liability to you for any direct or indirect loss or damage (including, without limitation, consequential loss or damage such as loss of profit or anticipated profit, loss of use, damage to goodwill and loss due to delay) however caused (including, without limitation, breach of contract, negligence and/or breach of statute), which you may suffer or incur in connection with this publication. © Copyright BlueScope Steel Limited 3 May, 2017
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