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Gust durations, gust factors and gust response factors in wind codes and standards

  • Holmes, John D. (JDH Consulting) ;
  • Allsop, Andrew C. (Arup AT+R) ;
  • Ginger, John D. (School of Engineering and Physical Sciences, James Cook University)
  • 투고 : 2014.05.06
  • 심사 : 2014.07.31
  • 발행 : 2014.09.25

초록

This paper discusses the appropriate duration for basic gust wind speeds in wind loading codes and standards, and in wind engineering generally. Although various proposed definitions are discussed, the 'moving average' gust duration has been widely accepted internationally. The commonly-specified gust duration of 3-seconds, however, is shown to have a significant effect on the high-frequency end of the spectrum of turbulence, and may not be ideally suited for wind engineering purposes. The effective gust durations measured by commonly-used anemometer types are discussed; these are typically considerably shorter than the 'standard' duration of 3 seconds. Using stationary random process theory, the paper gives expected peak factors, $g_u$, as a function of the non-dimensional parameter ($T/{\tau}$), where T is the sample, or reference, time, and ${\tau}$ is the gust duration, and a non-dimensional mean wind speed, $\bar{U}.T/L_u$, where $\bar{U}$ is a mean wind speed, and $L_u$ is the integral length scale of turbulence. The commonly-used Durst relationship, relating gusts of various durations, is shown to correspond to a particular value of turbulence intensity $I_u$, of 16.5%, and is therefore applicable to particular terrain and height situations, and hence should not be applied universally. The effective frontal areas associated with peak gusts of various durations are discussed; this indicates that a gust of 3 seconds has an equivalent frontal area equal to that of a tall building. Finally a generalized gust response factor format, accounting for fluctuating and resonant along-wind loading of structures, applicable to any code is presented.

키워드

참고문헌

  1. American Society of Civil Engineers (2010), Minimum design loads for buildings and other structures, ASCE/SEI 7-10. Structural Engineering Institute, ASCE, Reston, Virginia, U.S.A.
  2. American Association of State Highway and Transportation Officials (2013), Standard specifications for highway signs, luminaires and traffic signals, 6th Ed., AAHSTO, Washington, D.C., U.S.A.
  3. Beljaars, A.C.M. (1987), The measurement of gustiness at routine wind stations - a review, Royal Netherlands Meteorological Institute Report (KNMI), WR87-11, (Available online at: www.knmi.nl/bibliotheek/knmipubWR/WR87-11.pdf)
  4. British Standards Institution, (2005), Eurocode 1: Actions on structures - Part 1-4: General actions - wind actions, BS EN 1991-1-4:2005.
  5. Cook, N.J. (1985), The designer's guide to wind loading of building structures. Part 1. Background, damage survey, wind data and structural classification, Building Research Establishment and Butterworths, London, U.K.
  6. Davenport, A.G. (1961), "The application of statistical concepts to the wind loading of structures", Proc., Inst. of Civil Eng. (U.K.), 19, 449-472. https://doi.org/10.1680/iicep.1961.11304
  7. Davenport, A.G. (1964), "Note on the distribution of the largest value of a random function with application to gust loading", Proc., Inst. of Civil Eng. (U.K.), 28, 187-196. https://doi.org/10.1680/iicep.1964.10112
  8. Davenport, A.G. (1967), "Gust loading factors", J. Struct. Div. - ASCE, 93, 11-34.
  9. Deaves, D.M. and Harris, R.I. (1978), A mathematical model of the structure of strong winds, CIRIA Report 76, Construction Industry Research and Information Association, London, U.K.
  10. Durst, C.S. (1960), "Wind speeds over short periods of time", Meteor. Mag., 89, 181-186.
  11. ESDU International, (1983, 2002), Strong winds in the atmospheric boundary layer. Part 2: discrete gust speeds, ESDU Data Item 83045, ESDU International, London, U.K.
  12. Giblett, M.A. (1932), The structure of wind over level country, Geophysical Memoirs, No. 54, Meteorological Office, London, U.K..
  13. Greenway, M.E. (1979), "An analytical approach to wind velocity gust factors", J. Wind. Eng. Ind. Aerod., 5(1-2), 61-91. https://doi.org/10.1016/0167-6105(79)90025-4
  14. Holmes, J.D. (2002), "Gust loading factor to dynamic response factor (1967-2002)", Engineering Symposium to honour A.G.Davenport, London, Ontario, Canada, June 20-22.
  15. Holmes, J.D and Ginger, J.D. (2012), "The gust wind speed duration in AS/NZS 1170.2", Aust. J. Struct. Engg., 13, 207-217.
  16. International Organization for Standardization (ISO) (2009), Wind actions on structures, ISO 4354:2009, ISO, Geneva, Switzerland.
  17. Kwon, D.K. and Kareem, A. (2014), "Revisiting gust averaging time and gust effect factor in ASCE 7", J. Struct. Eng. - ASCE, available online at: http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0001102.
  18. Miller, C.A. (2007), "Defining the effective duration of a gust", Proceedings of the 12th International Conference on Wind Engineering, Cairns, Queensland, Australia, July 1-6.
  19. Miller, C.A. (2011), "Revisiting the durst gust factor curve", Can. J. Civil Engg., 38, 998-1001.
  20. Miller, C.A., Holmes, J.D., Henderson, D.J., Ginger, J.D. and Morrison, M. (2013), "The response of the Dines anemometer to gusts and comparisons with cup anemometers", J. Atmos. Ocean. Tech., 30, 1320-1336. https://doi.org/10.1175/JTECH-D-12-00109.1
  21. Simiu, E. (1980), "Revised procedure for estimating alongwind response", J. Struct. Div. - ASCE, 106(1), 1-10.
  22. Solari, G. (1993), "Gust buffeting. II: Dynamic alongwind response", J. Struct. Div. - ASCE, 119(2), 383-398. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:2(383)
  23. Standards Australia (2011), Structural design actions. Part 2: Wind actions, Australian/New Zealand Standard, AS/NZS 1170.2:2011, Standards Australia, Sydney, New South Wales, (amended 2012 and 2013).
  24. Vickery, B.J. (1966), "On the assessment of wind effects on elastic structures", Civil Engg. Trans., Inst. Eng. Aust., 18, 183-192.
  25. Vickery, B.J. (1968), "Load fluctuations in turbulent flow", J. Eng. Mech. Div. ASCE, 94, 31-46.
  26. Whittingham, H.E. (1964), Extreme wind gusts in Australia, Bureau of Meteorology, Bulletin No. 46.
  27. World Meteorological Organization (2008), Guide to meteorological instruments and methods of observation, 7th ed. WMO Tech. Rep. WMO-8. (Available online at: www.wmo.int/pages/prog/gcos/documents/gruanmanuals/CIMO/CIMO_Guide-7th_Edition-2008.pdf)

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