ROLE OF MAINTENANCE IN REDUCING BUILDING VULNERABILITY TO EXTREME - - PowerPoint PPT Presentation

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ROLE OF MAINTENANCE IN REDUCING BUILDING VULNERABILITY TO EXTREME - - PowerPoint PPT Presentation

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40 th IABSE Symposium ROLE OF MAINTENANCE IN REDUCING BUILDING VULNERABILITY TO EXTREME WEATHER EVENTS Lam Pham, Ekambaram Palaneeswaran Swinburne University of Technology, Australia Rodney Stewart Griffith University, Australia IABSE 2019

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40 th IABSE Symposium

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

ROLE OF MAINTENANCE IN REDUCING BUILDING VULNERABILITY TO EXTREME WEATHER EVENTS

Lam Pham, Ekambaram Palaneeswaran Swinburne University of Technology, Australia Rodney Stewart Griffith University, Australia

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IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

Prof Lam Pham et al. 2

  • Impacts of weather events in Australia
  • Australia practice
  • Opportunities for reducing building vulnerability
  • Storms and cyclones
  • Floods
  • Wildfires

CONTENT

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IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

Prof Lam Pham et al. 3

AUSTRALIA = 6 STATES + 2 TERRITORIES

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IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

Prof Lam Pham et al. 4

  • Loss analysis by States & Territories

AUSTRALIAN DISASTER LOSSES

(FROM HANDMER, LADDS AND MAGEE 2018)

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IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

Prof Lam Pham et al. 5

ANNUAL COST OF WEATHER EVENTS

Wildfire Flood Cyclone Storm Total VIC 8.9 3.6 9.0 21.5 NSW 1.8 7.2 16.8 25.8 SA 1.2 1.6 0.4 3.2 WA 0.4 0.1 2.7 1.2 4.5 QLD 0.6 14.4 13.1 3.8 31.9 TAS 1.9 0.4 2.3 NT 0.8 3.2 4.0 ACT 2.2 0.2 0.5 2.9 Total 17 28 19 32 96 As percentage of yearly average national loss for the last 46 years

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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EMERGING RISKS

  • Climate related risks
  • Extreme weather events become more intense
  • Heavy rainfall after long term drought
  • Change in construction practice
  • Leaky house syndrome
  • Condensation in living space
  • Non conforming building products
  • Fire resistance of cladding materials
  • Changing of supply sources
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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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AUSTRALIAN POLICIES & REGULATIONS

  • Issues with policies and regulation
  • performance-based: difficult to control
  • exclude post construction activities (e.g. maintenance)
  • Not covering all extreme events
  • Ineffective compliance and enforcement system
  • Senate inquiry (2018)- non conforming building products
  • Shergold and Weir report (2018)- lack of control
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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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OPPORTUNITIES FOR REDUCING VULNERABILITIES

  • Opportunities vary with type of hazards
  • Need to get better understanding
  • Risk exposure
  • Building vulnerability
  • Hazard characteristics

(Sendai Framework for Disaster Risk Reduction)

  • Building Vulnerability
  • Nature of the hazard
  • Age of building
  • Type of construction
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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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FLOOD – BUILDING VULNERABILITY

  • Damage is associated with the effects of water on materials such

as wall finishes and timber, mud collection inside the building and under the floor space

  • Regulation allows buildings in flood prone areas since 2012
  • Standard for construction of buildings on flood-prone land will

prevent structural failure but not damage for the submerged parts

  • Opportunity to ‘build better’ only exists after event – rarely taken
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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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STORM

Hail storm Thunder storm (Southern Australia) Cyclone (Northern Australia) Tornado Dust storm

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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STORM DAMAGE

Structu tural d damages

Wa Water Penetr trati tion Erosi sion

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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WIND

Region Basic Design Gust Speed A 45 – 46 m/s B 57 – 60 m/s C 69 – 74 m/s D 88 – 94 m/s

  • Tigh

ghtening o g of regu gulati tion a around 1 1980

  • Wate

ter p penetr tration c caused b by w wind driv iven r rain in – main c cause o

  • f property

ty damag mage

  • Vulnerable b

building e g elements identi tified b by d damage surveys

  • Sof
  • ftwar

are p packag age f for

  • r c

con

  • ndit

ition asses essmen ent d dev eveloped ed

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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STORMS – BUILDING VULNERABILITY

  • Damage is associated with high wind, hail and heavy rain (flash

flood and water penetration)

  • Regulation requires design for wind with annual probability of

1:500 to 1:1000 for most buildings

  • Regulation also requires weatherproofing with a test method for

verification

  • No design requirements for hail at present – most heavy loss per

single event

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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WILDFIRE

Central Queensland 2018

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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WILDFIRE

Fire seasons vary with location (Map by Bureau of Meteorology)

Location specific hazard varies with:

  • Weather
  • Vegetation
  • Ground slope
  • Regional risk varies

from year to year.

  • Bushfire potential

maps issued every year (AFAC+CRC)

  • Grass fire and forest

fire

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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WILDFIRE – BUILDING VULNERABILITY

  • Damage is associated with ember attack usually within 100m of the bush but

could be up to 1000m

  • Standard for buildings constructed in bushfire prone areas since 1999
  • Building vulnerability in bushfire prone areas is related to evacuation policy
  • Mandatory evacuation: better safety for people
  • Stay to put out spot fire: better for buildings
  • Maintenance reduces the risk of ignition due to embers
  • Removing combustibles around the buildings
  • Preventing embers from entering/accumulating in building cavities

(roof, wall, under floor …)

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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CONCLUDING REMARKS

A brief overview of

  • Australian major extreme weather events and their impacts
  • Australian building vulnerabilities to these events
  • Contributions that maintenance can make to mitigate the impacts
  • f these events

Thank you for your attention.

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Prof Lam Pham et al.

IABSE 2019 Symposium Towards a Resilient Built Environment Risk and Asset Management March 27-29, 2019

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ACKNOWLEDGEMENT

  • Our project (SBEnrc P1.53) Resilient Buildings: Informing

Maintenance for Long-term Sustainability has been sponsored by the Sustainable Built Environment National Research Centre in Australia.

  • Website for SBEnrc project P1.53:

https://sbenrc.com.au/research-programs/1-53/