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Abstract
Geoscience Australia has developed a wind hazard model for estimating the risk posed by peak wind gusts. In this study we have utilised the regional return period wind gusts as defined in the Australian/New Zealand wind loading standard (AS/NZS 1170.2, 2002) and applied the methodology detailed in the standard. In addition, our association with Dr. John Holmes (chairperson of the Australian Wind Loading committee) allowed us to make a significant attempt to remove the conservatism associated with the wind loading standard. Geoscience Australia entered into discussions with Dr. Holmes which resulted in a consultancy that reviewed the Geoscience Australia wind risk methodology and vulnerability model development (Holmes, 2004). Geoscience Australia's basic approach is detailed in the Perth Cities report (Lin et al., 2005). In the present study we build on that earlier work by examining three other city regions and contrasting the results. Each component of the methodology is described in this section with a brief overview provided below: Estimated return period regional wind speeds (for peak 3 second gusts at a height of 10 metres in open level terrain) were obtained from AS/NZS 1170.2. The local wind effects on these return period regional wind speeds were determined by assessing the local effect of terrain at the structure height of interest, the shielding effect on the structure and the topographic effect. These effects were numerically estimated using remote sensing techniques, digital elevation data and by using formulae given in AS/NZS 1170.2. Finally, the estimation of the local wind speeds that would be equalled or exceeded within a given time period (commonly called return period wind speeds or return levels) was derived by combining the local wind multipliers (terrain/height, shielding and topographic) for 8 cardinal directions with the return period regional wind speeds (from AS/NZS 1170.2) across a 25 by 25 metre grid covering each study region.
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nonGeographicDataset
eCat Id
71934
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- GA Publication
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2011-01-01T00:00:00
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geoscientificInformation
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