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This paper presents the residual flexural capacity of reinforced concrete beams under combined actions of corrosion and elevated temperatures. 17 concrete beams were manufactured and accelerated corrosion tests were conducted to obtain corrode concrete beams. After fire tests according to ISO 834 standard fire, each specimen was subjected to a four -point bending test. The results showed that corrosion led to premature failure of concrete beams. During fire tests, corrosion-induced cracks accelerated heat transfer in the concrete. Slight corrosion had little effect on the yield and ultimate load of concrete beams. One hour fire exposure had little effect on the load bearing capacities of slightly corroded or uncorroded beams. But when the corrosion degree exceeded 0.1, the load bearing capacities decreased by up to 31%. Increasing the concrete cover thickness significantly improved the load bearing capacity of corroded concrete beams. When the degree of corrosion of tension bars exceeded 0.069, energy dissipation capacities decreased significantly as much as 21%. The longer the fire exposure time was, the greater the decrease in energy dissipation. The conclusions obtained in this paper can provide a theoretical basis for the evaluation of residual performance of corroded concrete structures after exposure to fire.
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来源 :
STRUCTURES
ISSN: 2352-0124
年份: 2024
卷: 61
4 . 1 0 0
JCR@2022
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