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One advantage of steel reinforced concrete (SRC) columns is that the concrete encasement reduces the maximum temperature attained by the steel section in the full-range fire situation. For fire-exposed SRC columns, a better understanding of their post-fire performance can facilitate their rehabilitation and being re-used. This paper presents a numerical study into the post-fire performance of SRC columns. Results show that an SRC column of 600 x 600 mm in cross-section retained 0.87 times of the original load-bearing capacity after exposure to full-range fire with a heating duration of 45 min and a subsequent linear cooling down phase of 139 min. After the SRC column fully cooled down to ambient temperature, the proportion of load carried by the steel section increased to 73%, significantly higher than the level at ambient temperature (20%). Results of the parametric study revealed that a number of factors, i.e., duration of fire exposure, cross-sectional size, slenderness ratio and concrete strength, significantly affected the post-fire residual strength. The numerical method was applied to the post-fire assessment of the SRC columns in a fire-exposed building and a case study is presented. The resistance of the SRC column to compression reduced by 4% after fire exposure. By using the proposed repair method, the resistance to compression can be recovered by 11% compared to that before fire exposure.
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ENGINEERING STRUCTURES
ISSN: 0141-0296
Year: 2020
Volume: 211
5 . 5 0 0
JCR@2022
ESI Discipline: ENGINEERING;
ESI HC Threshold:115
Cited Count:
WoS CC Cited Count: 45
SCOPUS Cited Count: 52
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 4
Affiliated Colleges: