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Materials 2017, 10(3), 274; doi:10.3390/ma10030274

Mechanical Behavior of Recycled Aggregate Concrete-Filled Steel Tubular Columns before and after Fire

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
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Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 10 January 2017 / Revised: 26 February 2017 / Accepted: 2 March 2017 / Published: 9 March 2017

Abstract

Recycled aggregate concrete (RAC) is an environmentally friendly building material. This paper investigates the mechanical behavior of recycled aggregate concrete filled steel tube (RACFST) columns exposed to fire. Two groups of 12 columns were designed and tested, under axial compression, before and after fire, to evaluate the degradation of bearing capacity due to fire exposure. Six specimens were subjected to axial compression tests at room temperature and the other six specimens were subjected to axial compression tests after a fire exposure. The main parameters of the specimens include the wall thickness of the steel tube (steel content) and the type of concrete materials. Several parameters as obtained from the experimental results were compared and analyzed, including the load-bearing capacity, deformation capacity, and failure characteristics of the specimens. Meanwhile, rate of loss of bearing capacity of specimens exposed to fire were calculated based on the standards EC4 and CECS28:90. The results show that concrete material has a large influence on the rate of loss of bearing capacity in the case of a relatively lower steel ratio. While steel content has little effect on the rate of loss of bearing capacity of concrete-filled steel tube (CFST) columns after fire, it has a relatively large influence on the loss rate of bearing capacity of the RACFST columns. The loss of bearing capacity of the specimens from the experiment is more serious than that from the calculation. As the calculated values are less conservative, particular attention should be given to the application of recycled aggregate concrete in actual structures. View Full-Text
Keywords: recycled aggregate concrete; recycled aggregate concrete-filled steel tube; axial compression tests; fire exposure; loss of bearing capacity; mechanical behavior recycled aggregate concrete; recycled aggregate concrete-filled steel tube; axial compression tests; fire exposure; loss of bearing capacity; mechanical behavior
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, W.; Cao, W.; Zhang, J.; Wang, R.; Ren, L. Mechanical Behavior of Recycled Aggregate Concrete-Filled Steel Tubular Columns before and after Fire. Materials 2017, 10, 274.

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