Analysis and prediction methods for the static properties of reinforced concrete beams under fire

Liu, Chaofeng; Zhang, Bao; Guo, Xueyi; Liu, Caiwei

doi:10.1016/j.istruc.2022.12.041

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…This scheme makes it possible to write a system of equilibrium equations for the layers into which the section is divided. To describe the stressed-strained state in the cross-section of a reinforced concrete crossbar under heating conditions, a deformation model was used, on the basis of which SLAE was compiled for the implementation of the method for identifying concrete strength depending on the heating temperature (1).…”

Section: Substantiation Of the Adequacy Of The Results Of Identificat...mentioning

confidence: 99%

“…Experimental and computational methods of assessing fire resistance are used to predict the behavior of reinforced concrete crossbars under fire conditions [1]. These methods are currently employed to assess the fire resistance of reinforced concrete structures, in particular reinforced concrete crossbars, but they have advantages and disadvantages that impose certain specific conditions for their use and actualize efforts aimed at their improvement.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The value m=T max ⋅0.01 is the number of equations and variables in SLAE (1), which is calculated based on the maximum heating temperature of a reinforced concrete crossbar during fire tests.…”

Section: Mathematical Model For Identifying the Concrete Strength Of ...mentioning

confidence: 99%

“…In SLAE (1), {S} is the force vector in reinforcing bars, which is calculated using the following formula:…”

Section: Mathematical Model For Identifying the Concrete Strength Of ...mentioning

confidence: 99%

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Method for identifying the strength characteristics of concrete of a reinforced concrete crossbar during heating under conditions of fire

Pozdieiev,

Nekora,

Fedchenko

et al. 2023

EEJET

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This paper proposes a method that makes it possible to study the patterns of changes in the concrete strength of reinforced concrete crossbars depending on the heating temperature under fire conditions by interpreting the results of their standard fire tests. For the implementation of this method, it is proposed to use similar data obtained using mathematical modeling based on the finite element method and given material properties, including the curve of concrete strength reduction recommended by the guidelines, as data included in the set of measurement results during fire tests depending on temperature. Such data are time dependences of temperature indicators at individual cross-section points and time dependence of the maximum deflection of the crossbar. The article proposes an interpolation method that makes it possible to set the temperature at any point of the section based on the approximation of the isotherms by parabolas with a variable indicator of their power. A method based on the mathematical interpretation of temperature indicators obtained using the proposed interpolation method and the curve of the dependence of the maximum deflection on time using a deformation model for describing the stress-strain state is proposed to identify the dependence of the concrete strength of reinforced concrete crossbars. The work also shows that the results obtained using the proposed method of identifying concrete strength reduction coefficients are adequate as their relative error is on average no more than 7 %. Based on the results, the possibility of its application to study the regularities of the decrease in the strength of reinforced concrete crossbars under fire conditions has been proven

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Section: Substantiation Of the Adequacy Of The Results Of Identificat...mentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Mathematical Model For Identifying the Concrete Strength Of ...mentioning

confidence: 99%

“…In SLAE (1), {S} is the force vector in reinforcing bars, which is calculated using the following formula:…”

Section: Mathematical Model For Identifying the Concrete Strength Of ...mentioning

confidence: 99%

See 2 more Smart Citations

Method for identifying the strength characteristics of concrete of a reinforced concrete crossbar during heating under conditions of fire

Pozdieiev,

Nekora,

Fedchenko

et al. 2023

EEJET

View full text Add to dashboard Cite

show abstract

“…The impact of elevated heat on the thermal and static mechanical characteristics of RC beams were investigated by Liu et al [4] They used numerical simulation, theoretical analysis, and machine learning techniques. For four RC simply supported beams, fire tests and static stress testing following natural cooling were conducted.…”

Section: Introductionmentioning

confidence: 99%

Performance of reinforced concrete elements retrofitted with SIFCON under elevated temperatures

Alzamili

Elsheikh

2023

QJES

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Reinforced concrete (RC) elements lose their structural strength by exposing to fire as the mechanical properties of the reinforcing steel and concrete deteriorate due to the heat. This study provides an understanding of the behavior of three structural concrete elements: beam, column, and slab at high temperatures using a finite element (FE) modelling produced in ABAQUS, as well as the potential of retrofitting of these elements using Slurry Infiltrated Fiber Concrete (SIFCON). The use of SIFCON has shown excellent results compared to the fire damaged elements, and to the undamaged concrete elements in term of various indices (ultimate load capacity, stiffness, toughness and ductility).

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Performance of Fire Damaged Beam-Column Joints Strengthened with Slurry Infiltrated Fiber Concrete

Mohammed,

Akhaveissy,

Kadhum

2024

Iran J Sci Technol Trans Civ Eng

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Analysis and prediction methods for the static properties of reinforced concrete beams under fire

Cited by 8 publications

References 19 publications

Method for identifying the strength characteristics of concrete of a reinforced concrete crossbar during heating under conditions of fire

Method for identifying the strength characteristics of concrete of a reinforced concrete crossbar during heating under conditions of fire

Performance of reinforced concrete elements retrofitted with SIFCON under elevated temperatures

Performance of Fire Damaged Beam-Column Joints Strengthened with Slurry Infiltrated Fiber Concrete

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