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Buildings 2012, 2(4), 519-533; doi:10.3390/buildings2040519

Systematic Study of the Failure of a Light-Frame Wood Roof in a Tornado

1,* , 1
2 and 2
1 Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80523, USA 2 Department of Civil, Construction, and Environmental Engineering, University of Alabama, Tuscaloosa, AL 35487, USA
* Author to whom correspondence should be addressed.
Received: 28 August 2012 / Revised: 21 November 2012 / Accepted: 3 December 2012 / Published: 11 December 2012
(This article belongs to the Special Issue Building Failures)
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Tornadoes are a particularly devastating natural hazard that affect communities across the United States, particularly the Midwest and South. They are unique from an engineering point-of-view due to their very low probability of occurrence but often highly destructive consequences. The 2011 season was particularly devastating to the Southeastern portion of the U.S. This paper presents a single case study of a 2012 tornado that struck a single large rural light-frame wood house with an unconventional roof system. A fragility methodology was used as a tool to probabilistically study the loss of the roof system, and bound an Enhanced Fujita (EF) scale rating of the tornado. The tornado was initially rated as an EF3 tornado by the U.S. National Weather Service. However, following a detailed site inspection verified with numerical structural models, the tornado was downgraded to an EF2 tornado. As expected, the use of nail connections in a roof-to-wall connection resulted in a weaker link compared to a hurricane clip. The approach presented in this paper can be used as a supplement to the EF rating provided by U.S. National Weather Service meteorologists when unusual conditions in either the structure or surroundings exists.
Keywords: Tornado; fragility; EF rating; roof failure; residential structures; light-frame Tornado; fragility; EF rating; roof failure; residential structures; light-frame
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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van de Lindt, J.; Amini, M.O.; Standohar-Alfano, C.; Dao, T. Systematic Study of the Failure of a Light-Frame Wood Roof in a Tornado. Buildings 2012, 2, 519-533.

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