Methodology for investigating the behavior of reinforced concrete structures subjected to post earthquake fire

Behnam, Behrouz, Ronagh, Hamid R. and Baji, Hassan (2013) Methodology for investigating the behavior of reinforced concrete structures subjected to post earthquake fire. Advances in Concrete Construction, 1 1: 29-44.

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Author Behnam, Behrouz
Ronagh, Hamid R.
Baji, Hassan
Title Methodology for investigating the behavior of reinforced concrete structures subjected to post earthquake fire
Journal name Advances in Concrete Construction
ISSN 2287-5301
2287-531x
Publication date 2013-03-01
Year available 2013
Sub-type Article (original research)
Volume 1
Issue 1
Start page 29
End page 44
Total pages 16
Place of publication Daejeon, Korea
Publisher Techno-Press
Collection year 2014
Language eng
Abstract Post earthquake fire (PEF) can lead to the collapse of buildings that are partially damaged in a prior ground-motion that occurred immediately before the fire. The majority of standards and codes for the design of structures against earthquake ignore the possibility of PEF and thus buildings designed with those codes could be too weak when subjected to a fire after an earthquake. An investigation based on sequential analysis inspired by FEMA356 is performed here on the Life-Safety performance level of structures designed to the ACI 318-08 code after they are subjected to two different earthquake levels with PGA of 0.35 g and 0.25 g. This is followed by a four-hour fire analysis of the weakened structure, from which the time it takes for the weakened structure to collapse is calculated. As a benchmark, the fire analysis is also performed for undamaged structure and before occurrence of earthquake. The results show that the vulnerability of structures increases dramatically when a previously damaged structure is exposed to PEF. The results also show the damaging effects of post earthquake fire are exacerbated when initiated from second and third floor. Whilst the investigation is for a certain class of structures (regular building, intermediate reinforced structure, 3 stories), the results confirm the need for the incorporation of post earthquake fire in the process of analysis and design and provides some quantitative measures on the level of associated effects.
Keyword Fire resistance rating
Performance based design
Post earthquake fire
Reinforced concrete structures
Sequential analysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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Created: Wed, 27 Mar 2013, 13:13:51 EST by Behrouz Behnam on behalf of School of Civil Engineering