Wind and Structures

Techno-Press (테크노프레스)
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Wind-induced dynamic response of recessed balcony facades

  • Matthew J. Glanville (CPP) ;
  • John D. Holmes (JDH Consulting)
  • Received : 2023.12.11
  • Accepted : 2024.02.21
  • Published : 2024.03.25
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Abstract

Modern high-rise tower designs incorporating recessed balcony cavity spaces can be prone to high-frequency and narrow-band Rossiter aerodynamic excitations under glancing incident winds that can harmonize and compete with recessed balcony volume acoustic Helmholtz modes and facade elastic responses. Resulting resonant inertial wind loading to balcony facades responding to these excitations is additive to the peak design wind pressures currently allowed for in wind codes and can present as excessive facade vibrations and sub-audible throbbing in the serviceability range of wind speeds. This paper presents a methodology to determine Cavity Amplification Factors to account for façade resonant inertial wind loads resulting from balcony cavity aero-acoustic-elastic resonances by drawing upon field observations and the results of full-scale monitoring and model-scale wind tunnel tests. Recessed balcony cavities with single orifice type openings and located within curved façade tower geometries appear particularly prone. A Cavity Amplification Factor of 1.8 is calculated in one example representing almost a doubling of local façade design wind pressures. Balcony façade and tower design recommendations to mitigate wind induced aero-acoustic-elastic resonances are provided.

Keywords

Acknowledgement

Monitoring, testing and data analysis contributions from Peter Bourke, Adam van Duijneveldt, Thomas Evans, Tomer Libman, Christian Rohr, Jordan Black, David Bourke, Joe Sun and Christopher Spencer are acknowledged.

References

  1. Anderson, J. S. (1977), "The effect of an air flow on a single side branch Helmholtz resonance in a circular duct", J. Sound Vib., 52(3), 423-43. https://doi.org/10.1016/0022-460X(77)90569-7.
  2. Chatellier, L., Laumonier, J. and Gervais, Y. (2004), "Theoretical and experimental investigations of low Mach number turbulent cavity flows", Experim. Fluids 36, 728-740. https://doi.org/10.1007/s00348-003-0752-4.
  3. Coltman, J.W. (1976), "Jet drive mechanisms in edge tones and organ pipes", J. Acoustic. Soc. Amer., 60, 725-733. https://doi.org/10.1121/1.381120.
  4. Cooper, K.R. and Fitzsimmons, J., (2008), "An example of cavity resonance in a ground-based structure", J. Wind Eng. Ind. Aerod., 96, 807-816. https://doi.org/10.1016/j.jweia.2007.06.051.
  5. Ethembabaoglu, S. (1978), "Some characteristics of unstable flow past slots", J. Hydraulics Div., 104(5), 649-666. https://ascelibrary.org/doi/10.1061/JYCEAJ.0004992.
  6. Glanville, M.J. and Bourke, P.A. (2022), "Full-scale and wind tunnel investigations of fluctuating pressures in a recessed balcony cavity", Proceedings of the 8th European-African Conference on Wind Engineering, Bucharest, Romania, 20-23 September. https://doi.org/10.5281/zenodo.8092030.
  7. Holmes, J.D. and Bekele, S.E. (2021), Wind Loading of Structures, CRC Press. https://doi.org/10.1201/9780429296123.
  8. Lee, B.H.K. (2010), "Pressure waves generated at the downstream corner of a rectangular cavity", J. Aircraft, 47(3), https://doi.org/10.2514/1.46127.
  9. Ma, R., Slaboch, P.E. and Morris, S.C. (2009), "Fluid mechanics of the flow-excited Helmholtz resonator", J. Fluid Mech., 623, 1-26. https://doi.org/10.1017/S0022112008003911.
  10. Malone, J., Debiasi, M., Little, J. and Samimy, M. (2009), "Analysis of the spectral relationships of cavity tones in subsonic resonant cavity flows", Physic. Fluids, 21, 055103. https://doi.org/10.1063/1.3139270.
  11. Naudascher, E. and Rockwell, D (1994), Flow-Induced Vibrations - An Engineering Guide, CRC Press Taylor & Francis Group. https://doi.org/10.1201/9780203755747.
  12. Rockwell, D. and Naudascher, E. (1978), "Self-sustaining oscillations of flows past cavities", J. Fluids Eng., 100(2), 152-165, June. https://doi.org/10.1115/1.3448624.
  13. Rossiter, J.E. (1964), "Wind-tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds", Ministry of Aviation, Reports and Memoranda, No 3438. https://reports.aerade.cranfield.ac.uk/handle/1826.2/4020.
  14. Sergeev, D., V'yushkina, I., Eremeev, V., Stulenkov, A. and Pyalov, K. (2024), "Investigations into the approaches of computational fluid dynamics for flow-excited resonator Helmholtz modeling within verification on a laboratory benchmark", Acoustics 6(1), 18-34. https://doi.org/10.3390/acoustics6010002.
  15. Standards Australia, (2021), Structural Design Actions Part 2: Wind Actions, Australian/New Zealand Standard AS/NZS1170.2:2021, Standards Australia, NSW, Australia.
  16. Tang, Y. (2017), "The experimental study of coupled cavities and Helmholtz resonators at low Mach number", Ph.D. Dissertation The Hong Kong Polytechnic University, Department of Building Services Engineering, June. https://theses.lib.polyu.edu.hk/handle/200/9652.
  17. Verdugo, F.R. and Camussi, R. (2011), "Aeroacoustic source characterization technique applied to a cylindrical Helmholtz resonator", 18th International Congress on Sound and Vibration, Rio de Janeiro, Brazil, 10-14 July.
  18. Vickery, B.J. and Bloxham, C. (1992), "Internal pressure dynamics with a dominant opening", J. Wind Eng. Ind. Aerod., 41(1-3), 193-204, https://doi.org/10.1016/0167-6105(92)90409-4.