A simplified design charts for the vertical profile of horizontal downburst wind speeds
Date
2013
Authors
Abd Elaal, E.S.
Mills, J.E.
Ma, X.
Editors
Iyer, N.R.
Advisors
Journal Title
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Type:
Conference paper
Citation
Proceedings of the Eighth Asia-Pacific Conference on Wind Engineering, 2013 / Iyer, N.R. (ed./s), pp.511-521
Statement of Responsibility
Conference Name
Eighth Asia-Pacific Conference on Wind Engineering; APCWE-VIII (10 Dec 2013 - 14 Dec 2013 : Chennai, India)
Abstract
Most design specifications and codes for transmission line structures use the atmospheric synoptic wind as the basis of wind loading design parameters. However, many recent reports on failures of transmission line systems in several regions around world indicate that failure is due to downburst events rather than synoptic winds. The Australian/New Zealand Standard AS/NZS 7000:2010 Overhead line design has recently been amended to consider the effect of downburst winds through the introduction of two simple charts for the vertical and horizontal distribution of horizontal wind speed due to downbursts. However, there are various experimental, numerical and analytical simulation models that have been developed to investigate downbursts. Using the authors’ recently developed simulation models compared with observed field data, the Australian/New Zealand Standard has been assessed. A parametric study has been employed for the observed range of different downburst scales and parameters and then it has been coupled with the analytical simulation model for depicting the suggested different vertical profiles for horizontal downburst wind speeds. After investigating the vertical distribution of the horizontal downburst wind speed on vertical structures, a pair of simple charts has been prepared, which are more accurate and economical for design applications.
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Copyright 2013 APCWE-VIII