Structural Performance of Prestressed Composite Members with Corrugated Webs Exposed to Fire

Kang, Hye Won; Lee, Deuck Hang; Hwang, Jin‐Ha; Oh, Jin-Seok; Kim, Kang Su; Kim, Heung-Youl

doi:10.1007/s10694-015-0521-y

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…Furthermore, the emphasis of this work is focused on the flexural behaviour of slim-floor beams under standard time-temperature fire curve. This aspect has been studied through some experimental campaigns performed over the last years [1][2][3][4]. Specifically, a suitable fire behaviour during the event of fire is expected due to the fact that this types of beam are exposed to fire only from their lower flange, in contrast with other composite beams, which are not totally embedded in the floor.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature

Albero

Espinós

Serra

et al. 2019

Engineering Structures

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Slim-floor beams are a novel typology of steel beams where the steel profile is fully embedded within the concrete floor depth. While the use of this system is increasing fast in the construction practice, the available investigations on its fire performance are still scarce. This paper focuses on analysing the fire behaviour of slim-floor beams combined with hollow core slabs as flooring system. Two configurations are studied, namely Integrated Floor Beam (IFB) and Shallow Floor Beam (SFB). A finite element model is developed and validated by comparison with experimental results available in the literature as well as with thermal tests carried out by the authors. Subsequently, parametric studies are conducted with the aim of providing practical design recommendations. The influence of the composite beam configuration, concrete type, longitudinal reinforcement and steel plate thickness is studied.The conclusions drawn in this paper suggest that the SFB configuration may provide a significant enhancement in terms of fire resistance compared to IFB, provided that the appropriate combination of the parameters studied is used.

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Section: Introductionmentioning

confidence: 99%

Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature

Albero

Espinós

Serra

et al. 2019

Engineering Structures

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“…Concrete is a composite material made from a mixture of cement, aggregate, and water. When exposed to high temperatures, concrete expands in ways that depend on the thermal properties of each component, which may result in concrete cracks and spalling [4,5,6,7]. This phenomenon, in turn, drastically decreases the compressive and tensile strengths and durability of concrete.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Heating Temperature for Fire-Damaged Concrete Structures Using Adaptive Neuro-Fuzzy Inference System

et al. 2019

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The structural performance of concrete structures subjected to fire is greatly influenced by the heating temperature. Therefore, an accurate estimation of the heating temperature is of vital importance for deriving a reasonable diagnosis and assessment of fire-damaged concrete structures. In current practice, various heating temperature estimation methods are used, however, each of these estimation methods has limitations in accuracy and faces disadvantages that depend on evaluators’ empirical judgments in the process of deriving diagnostic results from measured data. Therefore, in this study, a concrete heating test and a non-destructive test were carried out to estimate the heating temperatures of fire-damaged concrete, and a heating temperature estimation method using an adaptive neuro-fuzzy inference system (ANFIS) algorithm was proposed based on the results. A total of 73 datasets were randomly extracted from a total of 87 concrete heating test results and we used them in the data training process of the ANFIS algorithm; the remaining 14 datasets were used for verification. The proposed ANFIS algorithm model provided an accurate estimation of heating temperature.

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“…Fire resistance is essential for RC structures to guarantee the safety of occupants' lives and property. 7 Unfortunately, prestressed concrete beams are vulnerable to building fires, 8 because the severe material degradation [9][10][11][12][13] and prestress loss [14][15][16] at elevated temperatures will lead to the overdeformation and even the destruction of prestressed beams. As the temperature increases, the reduction of yield strength and modulus of elasticity will be induced in steel bars, 9,12,13 and cause insufficient flexural bearing capacity and stiffness of prestressed beams.…”

mentioning

confidence: 99%

“…As the temperature increases, the reduction of yield strength and modulus of elasticity will be induced in steel bars, 9,12,13 and cause insufficient flexural bearing capacity and stiffness of prestressed beams. 6,9,16,17 Although a thick concrete cover is commonly prescribed for steel bars, it cannot guarantee an effective fire protection when fire-induced cracking and spalling occur. 10 Specially, prestressed steel bars are more sensitive to the elevated temperatures.…”

mentioning

confidence: 99%

“…15 The prestress loss resulting from a fire disaster will lead to an excessive deflection, thus accelerating concrete cracking, rebar exposure, and heat conduction, and eventually cause the prestressed beam to prematurely reach its fire resistance limit. Due to the inevitable material degradation and prestress loss under fire exposure, the prescribed performance of ordinary prestressed beam is unattainable, 6,9,16,17 which will hinder the evacuation and rescue operations in a fire disaster.…”

mentioning

confidence: 99%

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A hybrid steel–shape memory alloy prestressed concrete beam for improved fire resistance

Jia

et al. 2020

Struct Control Health Monit

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Summary Prestressed concrete beams are widely used in structures and infrastructures for their superior control effects on cross‐sectional area, cracking, and deformation. However, the fire resistance of ordinary prestressed beams is unsatisfactory due to the serious material degradation of concrete and steel, as well as the prestress loss at elevated temperatures. To achieve an acceptable fire resistance for prestressed concrete beams, the introduction of shape memory alloy (SMA) is proposed via the hybrid usage of prestressed steel and SMA bars. When the hybrid steel–SMA prestressed beam is exposed to fire, both the strength and modulus of elasticity of prestressed SMA bars will increase, which can compensate for the material degradation of prestressed steel bars. In addition, a desirable recovery stress can be generated in SMA bars at elevated temperatures and further compensate for the prestress loss of prestressed steel bars. To study the fire resistance of the proposed beam, the fitting formulae of material properties of concrete, steel, and SMA at elevated temperatures are given firstly. Then, the analytical model and working mechanism of the hybrid beam are also presented. Further, the methodology for the prediction of fire resistance, and the formulae for the calculation of beam's flexural bearing capacity and deflection, are also presented. A parametric study is further conducted to investigate the relationships between fire resistance and the area and location of prestressed SMA bars. Moreover, an optimal analysis is also established to obtain the most economical material cost of SMA bars. As a result, the proposed prestressed beam can achieve a better fire resistance in terms of both flexural bearing capacity and deflection control.

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Structural Performance of Prestressed Composite Members with Corrugated Webs Exposed to Fire

Cited by 12 publications

References 32 publications

Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature

Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature

Estimation of Heating Temperature for Fire-Damaged Concrete Structures Using Adaptive Neuro-Fuzzy Inference System

A hybrid steel–shape memory alloy prestressed concrete beam for improved fire resistance

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