Experimental Study on Residual Flexural Behavior of Reinforced Concrete Beams after Exposure to Fire

Xu, Yu; Wu, Bo; Jiang, Ming; Huang, Xin

doi:10.4028/www.scientific.net/amr.457-458.183

Cited by 26 publications

(9 citation statements)

References 3 publications

(3 reference statements)

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“…The reason was that after high temperature and cooling, the strength of longitudinal steel bars under stress recovered to a large extent, while the strength of concrete further decreased. So the shear strength of reinforced beam was significantly decreased 39 . As a result, the bending failure was changed to shear failure after high temperature.…”

Section: Resultsmentioning

confidence: 98%

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Characterization of bending performance of reinforced cementitious composites beams with hybrid fibers after exposure to high temperatures

Guan

Xie

et al. 2021

Structural Concrete

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The bending performance of reinforced beam containing steel fiber, polyvinyl alcohol (PVA) fiber, and calcium carbonate whisker after high temperature was studied. With the introduction of steel-PVA-whisker hybrid fibers, the thermal bursting and cracking of the reinforced beams were alleviated significantly. The peak load of reinforced beam was significantly increased with the introduction of 1.5 vol% steel fiber and 0.5 vol% PVA fiber. While the introduction of whisker led to decreased peak load and shear failure pattern of the beams, due to the decomposition of whisker at high temperature. The microscopic mechanism of action of fiber and whisker is discussed. A prediction model for the shear bearing capacity of reinforced beams with hybrid fibers after high temperature was proposed, considering the action of multiscale fibers and high temperature.calcium carbonate whisker, calculation of bearing capacity, high temperature, polyvinyl alcohol fiber, reinforced beam, steel fiber Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Resultsmentioning

confidence: 98%

“…So the shear strength of reinforced beam was significantly decreased. 39 As a result, the bending failure was changed to shear failure after high temperature. HyFRCC can be used as concrete material in fire resistance engineering.…”

Section: Failure Pattern Of Reinforced Beam After High Temperaturementioning

confidence: 99%

Characterization of bending performance of reinforced cementitious composites beams with hybrid fibers after exposure to high temperatures

Guan

Xie

et al. 2021

Structural Concrete

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“…Xu et al [19]- [21] presented experimental studies analyzing the residual strength after fire to shear and the bending moment of reinforced concrete beams with rectangular and "T" sections. In Xu et al [20] a study on estimating of the resistance after fire is presented based on the Chinese code [22], reducing the strengths of concrete and steel as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

Applicability of the 500°C isotherm method in determining the strength of reinforced concrete beams after fire

Costa

Silva

Pires

et al. 2022

Rev. IBRACON Estrut. Mater.

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A procedure to estimate the residual bending moment and the shear load capacity after fire in reinforced concrete beams was evaluated. The calculation method is based on the 500ºC Isotherm Method, adopting the reduction coefficients proposed by Van Coile et al. (2014) for the steel yield strength. The proposed method validation was done from experimental results of 62 reinforced concrete beams available in the literature. It was possible to observe a good approximation of the analytical method with the experimental data. For the bending moment an average ratio M r ana / M r exp of 1.04 and standard deviation of 0.15 was found. For the shear force an average ratio V r ana / V r exp of 0.85 and standard deviation of 0.23 was found.

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“…At present, postfire residual behavior of reinforced concrete (RC) structural members is still not well established. There are limited experimental and numerical studies on residual behavior of fire‐exposed NSC beams, with much fewer studies on HSC beams. In previously reported studies, a standard fire (heating) regime was mostly adopted for simulating fire damage in the beams, without any consideration to cooling phase, which is an important consideration for realistic fires in building compartments.…”

Section: Introductionmentioning

confidence: 99%

Residual response of fire‐damaged high‐strength concrete beams

Agrawal

Kodur

2019

Fire and Materials

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Summary This paper presents results from an experimental study on residual capacity of fire‐damaged high‐strength concrete (HSC) beams. Four reinforced concrete (RC) beams, fabricated with HSC, were first subject to structural loading and fire exposure with a distinct cooling phase and then loaded to failure upon cooldown to ambient conditions to evaluate residual capacity. Temperatures, deflections, and spalling in the beams were monitored during heating and cooling phases of fire exposure. Further, residual capacity, strains at critical section, and crack patterns (failure mode) of fire‐damaged beams were recorded during residual capacity tests. Results from experiments indicate that the load level during fire exposure, duration of heating phase, rate of cooling, extent (type) of spalling, and duration of postcooling storage influence residual deformations and also residual capacity of RC beams. Further, fire‐damaged HSC beams can recover 40% to 70% of their flexural capacity with respect to their room temperature design capacity provided they survive the entire duration of fire exposure.

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Experimental Study on Residual Flexural Behavior of Reinforced Concrete Beams after Exposure to Fire

Cited by 26 publications

References 3 publications

Characterization of bending performance of reinforced cementitious composites beams with hybrid fibers after exposure to high temperatures

Characterization of bending performance of reinforced cementitious composites beams with hybrid fibers after exposure to high temperatures

Applicability of the 500°C isotherm method in determining the strength of reinforced concrete beams after fire

Residual response of fire‐damaged high‐strength concrete beams

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