Determination of features of composite steel and concrete slab behavior under fire condition

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.246805

Keywords:

steel-reinforced concrete slabs, slab fire resistance, heat-insulating ability, stress-strain state, bearing capacity

Abstract

Methods for calculating the fire resistance of steel-reinforced concrete slabs made using profiled steel sheets under the influence of a standard temperature regime for more than 120 minutes are considered and analyzed.

Research has been carried out to determine the heating parameters and the stress-strain state of steel-reinforced concrete slabs made using profiled steel sheets under fire conditions for more than 120 minutes. The results of this study allow to obtain indicators of temperature distribution for assessing the fire resistance of such structures for fire resistance classes above REI 120. Accordingly, the results obtained are a scientific basis for improving the existing method for calculating the fire resistance of steel-reinforced concrete slabs made using profiled steel sheets.

The temperature distribution in the cross-section of structures was obtained using a general theoretical approach to solving the problem of heat conduction using the finite element method. Using the obtained temperature distributions, the parameters of the stress-strain state were determined based on the method of limiting states.

To carry out the calculations, appropriate mathematical models were created that describe the effect of the standard temperature regime of a fire, to determine the temperature distribution at every minute in the sections of steel-reinforced concrete slabs with profiled steel sheets. A method is proposed for dividing the section into zones to take into account the decrease in the indicators of the mechanical properties of concrete and steel.

A simplified method for the design assessment of steel-reinforced concrete slabs made using profiled steel sheets is proposed, which is consistent with the current EU standards and can be effectively used to analyze their fire resistance when establishing their compliance with the fire resistance class REI 120 and higher.

Author Biographies

Valeriia Nekora, Institute of Public Administration and Research in Civil Protection

Senior Researcher

Sector of Fire Safety and Technology

Center of Fire Protection Research

Stanislav Sidnei, Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine

PhD, Associate Professor

Department of Safety of Construction and Occupational Safety

Taras Shnal, Lviv Polytechnic National University

Doctor of Technical Sciences, Associate Professor

Department of Building Constructions and Bridges

Olga Nekora, Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine

PhD, Senior Researcher, Leading Researcher

Department of Organization of Scientific Activities

Iryna Dankevych, Lviv Polytechnic National University

PhD, Assistant

Department of Building Constructions and Bridges

Serhii Pozdieiev, Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine

Doctor of Technical Sciences, Professor, Chief Researcher

Department of Safety of Construction and Occupational Safety

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Published

2021-12-21

How to Cite

Nekora, V., Sidnei, S., Shnal, T., Nekora, O., Dankevych, I., & Pozdieiev, S. (2021). Determination of features of composite steel and concrete slab behavior under fire condition . Eastern-European Journal of Enterprise Technologies, 6(7 (114), 59–67. https://doi.org/10.15587/1729-4061.2021.246805

Issue

Vol. 6 No. 7 (114) (2021): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2021 Valeriia Nekora, Stanislav Sidnei, Taras Shnal, Olga Nekora, Iryna Dankevych, Serhii Pozdieiev

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