Wind Engineering for tomorrow buildings

1,090 views

Published on

Presentation given at the CENAERO-BBRI event about Building Simulation tools on 2012-05-25 in Gosselies (Belgium).

Introduction to Wind Engineering topics related to buildings and simulation tools.

Published in: Technology, Business
1 Comment
2 Likes
Statistics
Notes
No Downloads
Views
Total views
1,090
On SlideShare
0
From Embeds
0
Number of Embeds
11
Actions
Shares
0
Downloads
0
Comments
1
Likes
2
Embeds 0
No embeds

No notes for slide
  • Davenport (left) in 1964 at historic wind-tunnel tests at Colorado State University for the World Trade Center project, with (from left) Yamasaki, Levy, Skilling, Cermak and Robertson
  • Approved by IAWE(2007)
  • Construction & Service stages
  • Aeroelastic model 1:500
  • Max recorded wind speed ~ 55m/s (200 km/h)Above 700m,20m/s wind weekly exceededNo dampers
  • melfast.com
  • EN 1991-1-4 T=50 years for vb,0 = 23 m/s
  • CP
  • CP
  • Instabilités de flottement – phénomènes aéro-élastiques
  • Hybvent (2002): DH25 (degrés-heure de surchauffe) = nombre de jours où la température dépasse 25°C pondérés par l’écart de temp ./. 25°C Effet sur le résultat de l’évaluation du vent aussi important que l’évaluation des cp. Pour l’effet sur la prédiction du modèle thermique lié à la ventilation, les effets des incertitudes de l’action du vent sont aussi importants que l’incertitude liée aux gains internes. Le rapport de simulation devrait mettre en évidence les éventuelles incertitudes du modèle.- Incertitudes => Approche Monte-Carlo ?
  • Energie verte : 20% en 2020Production électricité verte : 10 à 30% en 2016Source : Dernière déclaration de politique générale du Gouvernement wallonEoliennes à axe horizontal ou vertical (Darrieus ou Savonius)Diversification, indépendance énergétique Pas de pertes dues au transport Potentiel d’innovation Image + (sensibilisation) Réduction CO2 Ex. : potentiel de 3 à 15 MW pour RBC
  • 15/01/2012 : 688 000 EUR
  • Wind Engineering for tomorrow buildings

    1. 1. Wind engineering for tomorrow buildings ir. Benoit PARMENTIER Head Division Structureswww.project-simba.eu (www.bbri.be) BBRI
    2. 2. The Learning CurveThe wind loading chainBeyond structural design : A) ComfortBeyond structural design : B) Energy productionInto the 21th century BBRI
    3. 3. The Learning CurveThe wind loading chainBeyond structural design : A) ComfortBeyond structural design : B) Energy productionInto the 21th century BBRI
    4. 4. 1964Wind tunnel tests of the WTC towers BBRI
    5. 5. ““Wind engineering is best defined asthe rational treatment of interactions between wind in the atmospheric boundary layer and man and his ” works on the surface of Earth. - Jack Cermak, 1975 BBRI
    6. 6. Interactions : the issues Structural Design Comfort Energy Production BBRI
    7. 7. Towards contemporary Wind EngineeringYear Researcher Event1643 Torricelli Barometer1687 Newton Movement laws,……1940 Tacoma Narrows Bridge collapse1954 Cermak 1st ABL wind-tunnel1954 Jensen Laws of scaling1961 Davenport Statistical concepts related to the wind action1963 1st International Conference on Wind action on buildings1970 « Wind Engineering » terminology1974 Eaton & Mayne Aylesbury House study1984 Holmes Wind tunnel pressure tubing response characteristics1987 Mehta Texas Tech Exp. Building1988 Robertson & Silsoe Structures Building Glass1992 Murakami 1st symposium on Computational Wind Engineering(1999) (BBRI) (Windhouse Exp. Building)* (*) humbly BBRI
    8. 8. Burj Khalifa163 floors26000 glass panels A Belgian contractor was responsible for execution [ proud mode ] 830m BBRI
    9. 9. Comfort @154th floor ? Glass panels resistance against localized pressures ?Stability ? BBRI
    10. 10. The reference tool : the wind-tunnel Atmospheric Boundary Layer (ABL) Scaled models (1:1 > 1:500) Rotating table Internal efforts measurements (balance,…) Pressure coefficients BBRI
    11. 11. Pressures integrationfor horiz. displacement calculations Location Elev. (m) Drift (cm) Top Offices +570 125 Top Residential +375 54 BBRI
    12. 12. The Learning CurveThe wind loading chainBeyond structural design : A) ComfortBeyond structural design : B) Energy productionInto the 21th century BBRI
    13. 13. Wind pressuresTurbulence effects BBRI
    14. 14. Alan G. Davenport The Wind Loading Chain Dynamic Effects UncertaintyReference DynamicPressure qb Ce CsCd Cp µ Pressure Exposure Coefficient Coefficient (roughness effects) BBRI
    15. 15. We do not design for all situationsWhirlwinds are classified as accidental actions in Belgium As high as 6000 Pa # Whirlwinds en Belgique 12 10 8 6 4 2 0 1982 2010 Waregem (2005) BBRI
    16. 16. Belgian meteorological data Spatial distribution of the reference wind speed qb = .ρ .v b2 1 qbb = 0,5.ρ.v b2b2 q = .ρ .v 1 2 210m heightRoughness cat. II BBRI
    17. 17. Belgian meteorological dataElevation & roughness effects 0 I II III IV q b. C e BBRI
    18. 18. The pressure coefficient CpThe Grail Quest… P − Pref Cp = .ρ .v 2 1 2 BBRI
    19. 19. The pressure coefficient CpThe Grail Quest… BBRI
    20. 20. The pressure coefficient CpSimple solutions for simple buildings…WInt© http://www.bbri.be/antenne_norm/eurocodes TNO Cp-generator BBRI
    21. 21. SlenderLighterComplexMulti-functional(Outsized) BBRI
    22. 22. Research toolsToolboxes VKI©Full-scale Wind-tunnel Numerical simulation BBRI
    23. 23. Toolbox 1 – Full-scale measurementsProblem identified for semi-permeable envelopes The Eurocode 1 assumes less difference BBRI
    24. 24. Toolbox 2 – Wind-tunnelFrom large scale structures to low-rise buildings… Greisch© Greisch© VKI© BBRI
    25. 25. Toolbox 2a – Wind-tunnelWind vortexes observed on roof… BBRI
    26. 26. Toolbox 2b – 1:1 Wind tunnel+ Rain/Snow… CSTB, Nantes © BBRI
    27. 27. The Learning CurveThe wind loading chainBeyond structural design : A) ComfortBeyond structural design : B) Energy productionInto the 21th century BBRI
    28. 28. Comfort : the ventilation strategyis based on the external pressures knowledge BBRI
    29. 29. The ventilation strategyIAQ & Summer comfort simulationsintegrate a sum of uncertainties(local wind, local pressure coefficients, models) N. Heijmans & P. Wouters (2002) BBRI
    30. 30. Ventilation Uncertainties from reference wind to local windAltitude [m] ?? qp [Pa] BBRI
    31. 31. Ventilation strategyDiscomfort simulations… DH25 is the number of hourly mean temperature above 25°C weighted by the temperature difference (T-25) DH25 198 173 178 138 CPe WIND N. Heijmans & P. Wouters (2002) – The PROBE building Simulations with CAPSOL© BBRI
    32. 32. The Learning CurveThe wind loading chainBeyond structural design : A) ComfortBeyond structural design : B) Energy production A) Energy productionInto the 21th century BBRI
    33. 33. Energy production – Urban wind turbinesInnovations needed to improve efficiency Design the building to be a “Particles accelerator” ? BBRI
    34. 34. Energy production – Urban wind turbines •Architectural integration ? •Stability - Vibrations •Production efficiency ? •Noise ?Les compagnons d’Eole© BBRI
    35. 35. Energy production – Photovoltaic panelsIn some cases, the wind action is underestimated 65 Collapses known in Belgium from 01/2012 BBRI
    36. 36. The Learning CurveThe wind loading chainBeyond structural design : A) ComfortBeyond structural design : B) Energy productionInto the 21th century BBRI
    37. 37. CFD tools Tomorrow tools to determine pressure coefficients on complex building shapesVerrière Fondation Louis Vuitton (jardin d’acclimation Paris)Frank Gehry© BBRI
    38. 38. CFD toolsThey need (more) validation • Validation Full(Model)-scale-CFD The future for Wind Engineering is also : • Special shape  generic approach • Automatic calculation of roughness (GIS approach) • More Monitoring after construction (pressures)Köse et al (2011) BBRI
    39. 39. A (french) discussion forum http://aiv.asso.fr/ BBRI
    40. 40. [Credits]#1 VKI#10 www.skyscraper.com#16 RMI http://www.meteo.be#19-20 Arthur Hugues#22 Herzog & DeMeuron - http://tinyurl.com/3ww4cbw Ghery & Milunic Unfcccecosingapore - http://tinyurl.com/3maywn3 Contemporist.com - http://tinyurl.com/6beqdt Ney & Partners – Knokke footbridge#25 Greisch#29 www.aucoeurdumonde.ca#30-32 Heijmans N. & Wouters P., ”Impact of the uncertainties on wind pressures on the prediction of thermal comfort performances”, Technical report for IEA, Annex 35 Hybvent, BBRI, 2002#35 www.compagnons-eole.be#36 www.lejdd.fr#39 Kose D.A., Fauconnier D. & Dick E. « ILES of flow over low-rise buildings:Influence of inflow conditions on the quality of the mean pressure distribution prediction », J. Wind Eng. Ind. Aerodyn. Vol 99 (2011) doi:10.1016/j.jweia.2011.07.008 BBRI

    ×