Investigating the effect of prior damage on the post-earthquake fire resistance of reinforced concrete portal frames

Ronagh, Hamid Reza and Behnam, Behrouz (2012) Investigating the effect of prior damage on the post-earthquake fire resistance of reinforced concrete portal frames. International Journal of Concrete Structures and Materials, 6 4: 209-220. doi:10.1007/s40069-012-0025-9

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Author Ronagh, Hamid Reza
Behnam, Behrouz
Title Investigating the effect of prior damage on the post-earthquake fire resistance of reinforced concrete portal frames
Journal name International Journal of Concrete Structures and Materials   Check publisher's open access policy
ISSN 1976-0485
2234-1315
Publication date 2012-12-01
Sub-type Article (original research)
DOI 10.1007/s40069-012-0025-9
Open Access Status DOI
Volume 6
Issue 4
Start page 209
End page 220
Total pages 12
Place of publication Seoul, Republic of Korea
Publisher Korea Concrete Institute
Collection year 2013
Language eng
Abstract Post-earthquake fire (PEF) can lead to a rapid collapse of buildings that have been partially damaged as a result of a prior earthquake. Almost all standards and codes for the design of structures against earthquake ignore the risk of PEF, and thus buildings designed using 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 immediate occupancy (IO), life safety (LS) and collapse prevention (CP) performance levels of two portal frames, after they are pushed to arrive at a certain level of displacement corresponding to the mentioned performance level. This investigation is followed by a fire analysis of the damaged frames, examining the time taken for the damaged frames to collapse. As a point of reference, a fire analysis is also performed for undamaged frames and before the occurrence of earthquake. The results indicate that while there is minor difference between the fire resistances of the fire-alone situation and the frames pushed to the IO level of performance, a notable difference is observed between the fire-alone analysis and the frames pushed to arrive at LS and CP levels of performance and exposed to PEF. The results also show that exposing only the beams to fire results in a higher decline of the fire resistance, compared to exposing only the columns to fire. Furthermore, the results show that the frames pushed to arrive at LS and CP levels of performance collapse in a global collapse mode laterally, whereas at the IO level of performance and fire-alone situation, the collapse mechanism is mostly local through the collapse of beams. Whilst the investigation is conducted for a certain class of portal frames, the results confirm the need for the incorporation of PEF into the process of analysis and design, and provide some quantitative measures on the level of associated effects.
Keyword Post-earthquake fire
Sequential analysis
Fire resistance
Reinforced concrete structures
Performance-based design
Immediate occupancy
Life safety
Collapse prevention
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 2013 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 15 times in Scopus Article | Citations
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Created: Thu, 28 Mar 2013, 00:11:45 EST by Behrouz Behnam on behalf of School of Civil Engineering