Performance of reinforced concrete structures subjected to fire following earthquake

Behnam, Behrouz and Ronagh, Hamid (2013) Performance of reinforced concrete structures subjected to fire following earthquake. European Journal of Environmental and Civil Engineering, 17 4: 270-292. doi:10.1080/19648189.2013.783882

Author Behnam, Behrouz
Ronagh, Hamid
Title Performance of reinforced concrete structures subjected to fire following earthquake
Journal name European Journal of Environmental and Civil Engineering   Check publisher's open access policy
ISSN 1964-8189
Publication date 2013-04
Year available 2013
Sub-type Article (original research)
DOI 10.1080/19648189.2013.783882
Volume 17
Issue 4
Start page 270
End page 292
Total pages 23
Place of publication Abingdon, Oxfordshire, United Kingdom
Publisher Taylor and Francis
Collection year 2014
Language eng
Formatted abstract
Fire following earthquake (FFE) is a serious threat to structures that are partially damaged in a prior earthquake potentially leading to a quick collapse of the structure. The majority of standards and codes for the design of structures against earthquake, however, ignore the possibility of FFE and thus buildings designed with those codes fail swiftly when exposed to fire after earthquake. A sequential structural analysis based on FEMA 356 is performed here on the Immediate Occupancy (IO) and the Life Safety (LS) performance levels of two reinforced concrete frames. The frames are first subjected to an earthquake load with a Peak Ground Acceleration (PGA) of.30 g. This is followed by a fire analysis, using ISO 834 and natural fire curves. The time taken for the structures weakened by the earthquake to collapse under these fires is then found through a robust numerical analysis. As a benchmark, fire-only analyses are also performed for undamaged structures. The results show that earthquake-weakened structures are more vulnerable to fire than undamaged structures, to the extent that the fire resistance of the damaged structures can decline to about a third of the original undamaged structures. The results also show that the fire resistance of the frame exposed to the natural fire differs from that of the frame exposed to the ISO 834 fire. This is due to the inclusion of parameters such as dimensions of the compartment as well as thermal properties of the combustible materials and the size and position of opening in the natural fire model, which does not exist in the ISO 834. Whilst the investigation is conducted for a certain class of structures (regular buildings, reinforced concrete frames, 3 stories), the results confirm the need for the incorporation of FFE into the process of analysis and design, and provides some quantitative measures on the level of associated effects
Keyword Fire following earthquake
Sequential Analysis
Fire resistance
Reinforced concrete structures
Performance based design
Immediate occupancy
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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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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