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Abstract

Firebrand spotting is the dominant wildfire propagation mechanism. The use of wire screens to prevent firebrand entry into structures is recommended or mandated by many standards. The existing standards address only one feature of screens which is opening size. This experimental study aims to explore several other factors that may influence the performance of wire screens and may need to be incorporated in codes and standards development process for structures located in wildfire-prone areas. The results demonstrate a previously unreported shattering mechanism in the case of Eucalyptus populnea (from the Myrtle family) leaf firebrands under a moderate wind speed of 14.5 m s⁻¹. The results also show that screen porosity, screen type and wind speed would be appropriate to be addressed in developing standards, but there is no need for concern about screen orientation as long as the screen is placed perpendicular to the wind direction during the experiment.

Keywords

Wire screen firebrand shower wildland fire wildland–urban interface building standard

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References

Poon

England

. Literature review of bushfire construction materials and proposed test protocols for performance assessment. WFRA project no. 20551, 2002, http://www.timber.net.au/images/downloads/fire/bushfire_20551.pdf

Chen

. Quantifying bushfire penetration into urban areas in Australia. Geophys Res Lett 2004; 31(12): L12212.

Standards Australia. Construction of buildings in bushfire prone areas (AS 3959). Sydney, NSW, Australia: Standards Australia, 2009.

Manzello

Shields

Yang

. On the use of a firebrand generator to investigate the ignition of structures in wildland–urban interface (WUI) fires. In: Proceedings of the 11th international fire science and engineering conference (INTERFLAM), London, 3–5 September 2007, vol. 2, pp. 861–872. London: Interscience Communications.

Manzello

Suzuki

Hayashi

. Enabling the study of structure vulnerabilities to ignition from wind driven firebrand showers: a summary of experimental results. Fire Safety J 2012; 54: 181–196.

California Residential Code. Part 2.5 – California code of regulations title 24. Sacramento, CA: California Building Standards Commission, 2014.

Manzello

Park

S-H

Shields

. Comparison testing protocol for firebrand penetration through building vents: summary of BRI/NIST full scale and NIST reduced scale results (NIST technical note 1659). Gaithersburg, MD: National Institute of Standards and Technology2010.

Manzello

Park

S-H

Suzuki

. Experimental investigation of structure vulnerabilities to firebrand showers. Fire Safety J 2011; 46(8): 568–578.

Franklin

. Burning cities: a posthumanist account of Australians and eucalypts. Environ Plann D 2006; 24: 555–577.

10.

Byram

. Combustion of forest fuels. In: Davis

(ed.) Forest fire: control and use. New York: McGraw-Hill, 1959, pp. 61–89.

11.

Ganteaume

Guijarro

Jappiot

. Laboratory characterization of firebrands involved in spot fires. Ann For Sci 2011; 68(3): 531–541.

12.

Safford

Schmidt

Carlson

. Effects of fuel treatments on fire severity in an area of wildland–urban interface, Angora Fire, Lake Tahoe Basin, California. Forest Ecol Manag 2009; 258(5): 773–787.

13.

Cruz

Sullivan

Gould

. Anatomy of a catastrophic wildfire: the Black Saturday Kilmore East fire in Victoria, Australia. Forest Ecol Manag 2012; 284: 269–285.

14.

Sharifian

Hashempour

. A novel ember shower simulator for assessing performance of low porosity screens at high wind speeds against firebrand attacks. J Fire Sci 2016; 34(4): 335–355.

15.

Sharifian

. An experimental study of wind force acting on commercial double-layered square metal screens at different spacing. In: Proceedings of the 17th Australasian fluid mechanics conference (AFMC 2010), Auckland, New Zealand, 5–9 December 2010, pp. 9–12. University of Auckland; Australasian Fluid Mechanic Society.

16.

Sharifian

Buttsworth

. Direct radiation from wildfires through square woven screens. In: Proceedings of the ASME summer heat transfer collocated with the fluids engineering, energy sustainability, and 3rd energy nanotechnology conferences, Jacksonville, FL, 10–14 August 2008. New York: ASME.

17.

Sharifian

Buttsworth

. Double-layered metal mesh screens to contain or exclude thermal radiation from bush fires. J Fire Prot Eng 2010; 20(4): 291–311.

18.

Hashempour

Sharifian

Billingsley

. An experimental approach to measure direct radiation through single-layer square cell plain woven screens. J Heat Transf 2016; 138(1): 012701-1–012701-6.

Effective factors on the performance of woven wire screens against leaf firebrand attacks

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