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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 9    September 2018

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Stress redistribution of simply supported reinforced concrete beams under fire conditions
DING Fa-xing(丁发兴)1, LI Zhe(李喆)1, CHENG Shan-shan2, YU Zhi-wu(余志武)1, 3

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. School of Engineering, Plymouth University, PL4 8AA, United Kingdom;
3. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China

Abstract:This study presents experimental and numerical investigations of simply supported steel reinforced concrete (RC) beams under fire. The temperature field of cross sections, the vertical deflection at mid-span, and specifically the axial expansion displacement at beam-ends were measured during the fire tests. A novel finite element (FE) model of a RC beam under fire was developed, in which the water loss in the heat transfer analysis and the concrete transient strain in the mechanical analysis were considered. Based on the validated FE model proposed in this study, parametric studies were conducted to investigate the effects of the beam type, the protective layer thickness, and the load ratio on the thermal and mechanical behavior of simply supported RC beams. It was found that greater fire resistance and fire performance of girder beams in comparison to secondary beams contributed to the non-structural reinforcements, which effectively compensated for the reduced tensile capacities of structural reinforcements because of the degradation of the material properties. In addition, the history of normal stress distributions of concrete under fire can be divided into three phases: expansion, stress redistribution and plateau phases.

 

Key words: reinforced concrete beam; transient strain; fire condition; parametric analysis; stress redistribution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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