Response of Restrained Concrete Beams under Design Fire Exposure

Dwaikat, Mahmud; Kodur, Venkatesh

doi:10.1061/(asce)st.1943-541x.0000058

Cited by 120 publications

(62 citation statements)

References 14 publications

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“…Beam B5 was subjected to two point loads of 60 kN or 65% of the beam capacity. Full details on the specimens, test procedure, test apparatus and instrumentation can be found elsewhere [32].…”

Section: Test Proceduresmentioning

confidence: 99%

Fire Induced Spalling in High Strength Concrete Beams

Dwaikat

Kodur

2009

Fire Technol

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A macroscopic finite element model is extended to account for fire induced spalling in high strength concrete (HSC) beams. The model is based on the principles of mechanics and thermodynamics and utilizes pore pressure calculations to predict fire induced spalling in concrete. For validating the model, spalling measurements were made by conducting fire resistance experiments on four normal strength and high strength concrete beams. Spalling predictions from the model are compared with the measured values of spalling at various stages of fire exposure. The validated model is applied to investigate the influence of fire scenario, concrete strength (permeability) and axial restraint on the fire induced spalling and fire response of RC beams. Results from the analysis show that fire scenario, and concrete permeability largely influence the extent of fire induced spalling in concrete beams. Further, it is also shown that the extent of spalling has significant influence on the fire resistance of RC beams.

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Section: Test Proceduresmentioning

confidence: 99%

Fire Induced Spalling in High Strength Concrete Beams

Dwaikat

Kodur

2009

Fire Technol

Self Cite

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“…Figure 8(a) shows the cross-sectional dimensions and thermocouple locations in beam specimen B2 [3]. The section dimensions of specimen B2 were 254 406 mm.…”

Section: Validation Of Finite Element Analysismentioning

confidence: 99%

“…The thermal properties of concrete in the cooling period was assumed to be the same as those in the heating period due to the lack of thermal properties data on the cooling period [3]. Figure 3 shows 16 idealized time-temperature curves that represent the different combinations of heating periods (hp) and cooling periods (cp) chosen in this study (1,2,3, and 4 h). During heating, the rectangular RC beams were subjected to the ASTM E119 standard fire, which is given by Eq.…”

Section: Engineering Journalmentioning

confidence: 99%

“…To investigate the applicability of the proposed nonlinear finite element analysis, the experimental data from a study by Dwaikat and Kodur [3] were chosen. Figure 8(a) shows the cross-sectional dimensions and thermocouple locations in beam specimen B2 [3].…”

Section: Validation Of Finite Element Analysismentioning

confidence: 99%

“…Previous experimental results showed that the temperature within the concrete member continues to increase after heating in the furnace [2][3][4]. The peak or maximum temperature at points in the beam section can occur at different time stages after heating.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Analysis for Peak Temperature Distribution in Reinforced Concrete Beams after Exposure to ASTM E119 Standard Fire

Tiantongnukul¹,

Lenwari²

2017

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Abstract.To assess the post-fire or residual strength of fire-damaged reinforced concrete (RC) members, the most detrimental or peak temperature distribution within the members should be perceived. For RC beams, the residual flexural response is strongly influenced by the peak temperature experienced by the steel reinforcements. This paper presents a simplified two-dimensional (2D) nonlinear transient thermal analysis for the peak temperature distribution in RC beams using the finite element method. In the analysis, the thermal loading for heating was the ASTM E119 standard fire. After heating, a linear decrease in temperature was assumed for cooling. Three-sided fire exposure was assumed for rectangular RC beams. The analysis was used to investigate the effects of the heating period (1-4 h), cooling period (1-4 h), concrete cover thickness (30-50 mm) and aggregate type (carbonate or siliceous aggregates) on the peak steel temperature and delayed time (time to attain the peak temperature after heating). The numerical results showed that the temperature inside the beam section continues to rise after heating. The increases in steel temperature after heating and delayed time are influenced by the heating period, cooling period, location of steel reinforcement, and aggregate type. Such increase is significant for the beam with a thick concrete covering subjected to a short heating period followed by a long cooling period. At the longest (4 h) cooling and shortest (1 h) heating periods, the increases in steel temperature after heating in both carbonate and siliceous concrete beams are approximately 35, 50 and 75% for concrete cover thicknesses of 30, 40, and 50 mm, respectively. The carbonate concrete beams are more vulnerable to fire damage than siliceous ones when subjected to long heating and cooling periods.

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Enhancing fire‐resistant design of reinforced concrete beams by investigating the influence of reliability‐based analysis

Szép,

Movahedi Rad,

Habashneh

2024

Engineering Reports

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A depth investigation into the impact of high temperatures on the load‐bearing capacity of reinforced concrete beams in the case of probabilistic design is presented in this paper, employing advanced finite element analysis techniques. This study addresses a critical knowledge gap in the design of fire‐resistant concrete structures, with specific emphasis on the function of concrete cover. The research aims to enhance the overall safety and reliability of concrete buildings under high temperature conditions by providing valuable insights into the behavior of reinforced concrete beams under thermal loading. The analysis incorporates reliability‐based modeling to account for uncertainties in temperature distribution within the beams. A validated finite element model is employed to simulate the performance of reinforced concrete beams at elevated temperatures. By considering various concrete cover thicknesses and heat distribution scenarios, the influence of these factors on the load‐bearing capacity is thoroughly examined. The results underscore the importance of augmenting the concrete cover to enhance the load‐carrying capacity of the beams. Furthermore, the study examines the impact of temperature distribution uncertainties, unveiling diverse load capacities associated with different configurations of concrete cover.

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Response of Restrained Concrete Beams under Design Fire Exposure

Cited by 120 publications

References 14 publications

Fire Induced Spalling in High Strength Concrete Beams

Fire Induced Spalling in High Strength Concrete Beams

Thermal Analysis for Peak Temperature Distribution in Reinforced Concrete Beams after Exposure to ASTM E119 Standard Fire

Enhancing fire‐resistant design of reinforced concrete beams by investigating the influence of reliability‐based analysis

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