wind classification to as4055-2012 - structural engineers · •as4055 “wind loads for housing”...
TRANSCRIPT
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WIND CLASSIFICATION TO AS4055-2012BY ANDREW MACKENZIE – MARCH 2018
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AS4055 – THE W’S
• AS4055 “Wind Loads for housing” and is a simplified version of AS1170.2.
• Engineers, designers, builders, architects and manufacturers in the Residential sector.
• Used to classify sites into 1 of 10 bracketed wind speed categories.
• Speed Pressures Forces Design of bracing, members and connections.
• Faster, reasonably accurate method.
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SCOPE AND LIMITATIONS
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HOW CLASSIFICATION PROCESS WORKS
• Need to determine 4 site specific conditions and refer to Table 2.2
• Wind Region – Choice of 4
• Terrain Category – Choice of 5
• Shielding Class – Choice of 3
• Topographic Class – Choice of 5
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WIND REGION
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TERRAIN CATEGORY
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TOPOGRAPHIC CLASSIFICATION
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SHIELDING CLASS
• Full, Partial and No shielding
• Full = 2 rows of houses surrounding site considered (can include large trees in Region A & B)
• Partial = 1 row of houses surrounding site
• No Shielding = 0
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FINAL WIND CLASSIFICATION
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ADDITIONAL INFORMATION
• Further detail, explanation and commentary provided in clauses and Appendix of AS4055
• If classification is not possible – Refer to AS1170.2
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EXAMPLE 1–10 TAABINGA STREET, WAVELL HEIGHTS
• Region B
• TC3
• T1 – Top third of a10m Hill @ 5°
• FS
• N2
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EXAMPLE 2 – 773 STOCKROUTE ROAD, PALMYRA
• Region C
• TC2
• T2 – Top third of a <30m Hill @ 9.5°
• NS
• C3
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COMPARISON TO AS1170.2
• Same site to AS1170.2
• Wind Speed to AS4055