2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference
Mr. Derek Stedman, UWO
Dr. Gregory Kopp, UWO
The authors conducted a tornado damage investigation on June 18, 2014 in Angus, ON. The storm was reported to have occurred around 5 to 6 PM on June 17. The damage indicators support the classification of the storm as an EF-2 tornado. Most of the damage was contained within the backyards of two streets, although 101 houses were found to have sustained some level of damage, including 11 houses that sustained complete roof failure. The paper will discuss these damage observations, in light of recent wind tunnel and full-scale laboratory studies at the “3 Little Pigs” project, with the objective of defining the wind speeds associated with this tornado. The damage survey identified damage that could have been mitigated and in some cases prevented entirely. The quality of construction likely affected the performance of the roofs, with repeated patterns found in the failures. Fragility analyses of the failures, considering the effects of missing toe-nails, are included in the analysis. The results are compared from damage observations at adjacent houses, where only damage to cladding systems was observed. Additionally, there was an overturned vehicle in front of a row of houses where repeated failures occurred, providing an independent point of reference for estimating wind speeds in the tornado. Wind tunnel studies of overturning vehicles are included in this comparative analysis.