Climate changeImpact on the Belgianbuilding construction                        Benoit PARMENTIER                        H...
[Climate change – The risks]…                                Parry et al (2001)
Climatic actionson the building…(more) Wind     (Elevated) Temperature   (more) Rain      (more) Snow              New cli...
Is the climatereally changing ?
[Some facts]…
[Some facts]…The Netherlands :   [+   1…+3°C] in 2050IPCC :              [+   2…+6°C] in 2100
[Some facts]…  Average     12Temperature   [°C]              10              8              6              4              ...
No increase of cold weather                    periods
No increase of rain
(min 20mm / day)                   No rain increase(max in 1h)
[Some facts]…No storms increase                     (Vmax>70km/h)
[Some facts]…                  Number of tornadoes stable                  12                  10                   8     ...
[Some facts]…                Snow days (even) decreasing !
Is it important ?
What do you think ?
Roissy-T2E (2004, 5 deaths)This is partly due to thermal effects…
Redundancy vs. Design …on the edge Samyn & Partners
Adaptation strategies (3)1. Do nothing2. Standards adaptation   (today scenarii ?)3. Progressive adaptation               ...
[Recap]…Belgian climate evolution(apart from elevatedtemperatures) is ratherlimitedImpact of climate changeon building con...
Flat roofs collapse     Some insights aboutDecember 2010 in Belgium
[Context]…Newspaper articles     10about roof collapses   0                       01/12/10   31/12/10
[Context]…Geographical distributionof the accidents
[Context]…+40     Collapses in        Belgium in 2010
Light structures(steeldeck, timber,…)
Large flat roofs
1. Exceptional snow ?2. Snow nominal density ?3. Design methods ?4. Accumulations ?5. Others…?
1. Exceptional snow ?
Flashback… Papers related to roof collapses in Belgium                                       2010-2011                    ...
Abnormal coldtemperatures 20° 15° 5° 0°-5°-15°                December 2010
Height                                             Accidents [cm] 35                                             7        ...
Max. Snow                                             Design level [m]             0.8             0.7             0.6    ...
2. Snow nominal density ?
[Density variation] Snow                  γsnow [kN/m³] Fresh                  1,0                        1,5       Belgia...
3. Design methods ?
[Design methods]Eurocode 1 Part 1-3(NBN EN 1991-1-3)
4. Accumulations ?
Dynamic effects
5. Others…?
[Ponding effect]    Ponding effect
[Ponding effect]…
Where do the rain go ?
[Ponding effect]…Design gargoyles (b)                       b
Roof slope evolution ifo thewater level                                               Initial roof                        ...
1 m³Assume dysfunctioningcommon water discharges…         0.35         0.25         0.15                  Water level     ...
2 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
3 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
4 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
5 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
6 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
7 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
8 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
9 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
10 m³0.350.250.150.05-0.05 1   3   5   7   9   11   13   15   17   19   21-0.15
Water level [m]                           Peak for designing gargoyles          0.12           0.1          0.08          ...
[Standardization]              §5.2 (6) Dans les régions où des pluies sur la             neige peuvent provoquer des fon...
[Standardization]              §5.2 (6) :                                                   ― NBN EN 1991-1-3 -   ANB
[Communication]…                                      Roof conceptArchitect <> Engineer <> Contractor   Execution
[Credits]#2    http://fr.wikinoticia.com/culture-science/écologie et environnement#4    http://klimaforum10.com#5    http:...
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Flat roofs collapses due to snow in belgium & some ideas about climatic changes.

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Some ideas about impact of climate change on building design. And some observations due to roof collapses in December 2010 due to snow.

Presented at TC Architects in 2011.

Published in: Technology, News & Politics
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Flat roofs collapses due to snow in belgium & some ideas about climatic changes.

  1. 1. Climate changeImpact on the Belgianbuilding construction Benoit PARMENTIER Head Division Structures BBRI (www.bbri.be)
  2. 2. [Climate change – The risks]… Parry et al (2001)
  3. 3. Climatic actionson the building…(more) Wind (Elevated) Temperature (more) Rain (more) Snow New climate New actions
  4. 4. Is the climatereally changing ?
  5. 5. [Some facts]…
  6. 6. [Some facts]…The Netherlands : [+ 1…+3°C] in 2050IPCC : [+ 2…+6°C] in 2100
  7. 7. [Some facts]… Average 12Temperature [°C] 10 8 6 4 Yearly average temperature 2 increases @Uccle (BE) 0 1820 1970 2020
  8. 8. No increase of cold weather periods
  9. 9. No increase of rain
  10. 10. (min 20mm / day) No rain increase(max in 1h)
  11. 11. [Some facts]…No storms increase (Vmax>70km/h)
  12. 12. [Some facts]… Number of tornadoes stable 12 10 8 6 4 2 0 1982 2010Waregem (2005)
  13. 13. [Some facts]… Snow days (even) decreasing !
  14. 14. Is it important ?
  15. 15. What do you think ?
  16. 16. Roissy-T2E (2004, 5 deaths)This is partly due to thermal effects…
  17. 17. Redundancy vs. Design …on the edge Samyn & Partners
  18. 18. Adaptation strategies (3)1. Do nothing2. Standards adaptation (today scenarii ?)3. Progressive adaptation Steenbergen et al (2009)
  19. 19. [Recap]…Belgian climate evolution(apart from elevatedtemperatures) is ratherlimitedImpact of climate changeon building construction isuncertain, but can beimportant
  20. 20. Flat roofs collapse Some insights aboutDecember 2010 in Belgium
  21. 21. [Context]…Newspaper articles 10about roof collapses 0 01/12/10 31/12/10
  22. 22. [Context]…Geographical distributionof the accidents
  23. 23. [Context]…+40 Collapses in Belgium in 2010
  24. 24. Light structures(steeldeck, timber,…)
  25. 25. Large flat roofs
  26. 26. 1. Exceptional snow ?2. Snow nominal density ?3. Design methods ?4. Accumulations ?5. Others…?
  27. 27. 1. Exceptional snow ?
  28. 28. Flashback… Papers related to roof collapses in Belgium 2010-2011 2005-20062000 2006 2011
  29. 29. Abnormal coldtemperatures 20° 15° 5° 0°-5°-15° December 2010
  30. 30. Height Accidents [cm] 35 7 Snow+Rain 30 6 25 5 20 4 15 3 Snow 10 2 5 1 0 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 December 2010 @Uccle
  31. 31. Max. Snow Design level [m] 0.8 0.7 0.6 0.5 0.4 32cm 0.3 0.2 Observation 0.1 0.0 0 100 200 300 400 500 600 700 Altitude [m]
  32. 32. 2. Snow nominal density ?
  33. 33. [Density variation] Snow γsnow [kN/m³] Fresh 1,0 1,5 Belgian standard (design) Some days 2,0 Some weeks 2,5 à 3,5 Wet 4,0
  34. 34. 3. Design methods ?
  35. 35. [Design methods]Eurocode 1 Part 1-3(NBN EN 1991-1-3)
  36. 36. 4. Accumulations ?
  37. 37. Dynamic effects
  38. 38. 5. Others…?
  39. 39. [Ponding effect] Ponding effect
  40. 40. [Ponding effect]…
  41. 41. Where do the rain go ?
  42. 42. [Ponding effect]…Design gargoyles (b) b
  43. 43. Roof slope evolution ifo thewater level Initial roof slope 0.35 0.25 0.15 0.05 -0.05 1 3 5 7 9 11 13 15 17 19 21 -0.15 Wijte (2005)
  44. 44. 1 m³Assume dysfunctioningcommon water discharges… 0.35 0.25 0.15 Water level 0.05 -0.05 1 3 5 7 9 11 13 15 17 19 21 -0.15
  45. 45. 2 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  46. 46. 3 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  47. 47. 4 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  48. 48. 5 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  49. 49. 6 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  50. 50. 7 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  51. 51. 8 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  52. 52. 9 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  53. 53. 10 m³0.350.250.150.05-0.05 1 3 5 7 9 11 13 15 17 19 21-0.15
  54. 54. Water level [m] Peak for designing gargoyles 0.12 0.1 0.08 0.06 0.04 0.02 0 0 2 4 6 8 10 Water volume [m³]
  55. 55. [Standardization]  §5.2 (6) Dans les régions où des pluies sur la neige peuvent provoquer des fontes suivies de gel, il convient d’augmenter les charges de neige sur les toitures, en particulier si la neige et la glace peuvent bloquer le système de drainage de la toiture.  ― NBN EN 1991-1-3
  56. 56. [Standardization]  §5.2 (6) :  ― NBN EN 1991-1-3 - ANB
  57. 57. [Communication]… Roof conceptArchitect <> Engineer <> Contractor Execution
  58. 58. [Credits]#2 http://fr.wikinoticia.com/culture-science/écologie et environnement#4 http://klimaforum10.com#5 http://www.catnat.net/donneesstats#16 CTK#17 Samyn & Partners#20 http://www.photo-depot.com#25 http://www.tendanceouest.com#9 Magritte#37 Régie de bâtiments (thanks to P. Vandenbossche)#39 CSTC-WTCB NIT 191#40 S. Wijte### http://www.meteo.be (thanks to M. Van Diepenbeeck)

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