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Structural damage evaluation of reinforced concrete beams exposed to high temperatures

Title
Structural damage evaluation of reinforced concrete beams exposed to high temperatures
Authors
Choi, Eun GyuShin, Yeong-SooKim, Hee Sun
Ewha Authors
신영수김희선
SCOPUS Author ID
신영수scopus; 김희선scopus
Issue Date
2013
Journal Title
JOURNAL OF FIRE PROTECTION ENGINEERING
ISSN
1042-3915JCR Link1532-172XJCR Link
Citation
vol. 23, no. 2, pp. 135 - 151
Keywords
Reinforced concrete beamsnormal-strength concretehigh-strength concreteconcrete load reductionconcrete stiffness reductionstructures in fire
Publisher
SAGE PUBLICATIONS LTD
Indexed
SCOPUS WOS
Abstract
The objective of this study is to investigate the effect of temperature distribution, concrete strength, cover thickness, and heating time on the structural behavior of reinforced concrete beams. Toward this goal, reinforced concrete beams with different concrete compressive strength and cover thickness are fabricated and subjected to furnace heating for 60, 90, and 120 min under a loaded state. In order to analyze structural behavior based on the thermal behavior of the beams, transient temperature distribution is measured during the furnace heating. After furnace heating, spalling is observed. From loading tests performed on the damaged reinforced concrete beams, residual strength, maximum loads, and beam deflections are measured and examined. The experimental results show that significant damage occurs in the reinforced concrete beams under high temperatures. In addition, it is found that thermal and structural behavior of damaged reinforced concrete beams is dependent on cover thickness and concrete strength and that most structural damage occurs in a relatively short period of heating time. Using these experimental findings, an equation is proposed that can be used to predict maximum load capacity and stiffness reduction ratio of the damaged reinforced concrete beams.
DOI
10.1177/1042391512474666
Appears in Collections:
엘텍공과대학 > 건축공학전공 > Journal papers
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