Assessment of fire resistance of fireproof steel structures to ensure fire safety of facilities

 

Andrii Kovalov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-6525-7558

 

Yurii Otrosh

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-0698-2888

 

Nina Rashkevich

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0001-5124-6068

 

Serhii Rudakov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0001-8263-0476

 

Vitalii Tоmеnkо

Cherkassy Institute of Fire Safety of National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-7139-9141

 

Serhii Yurchenko

Cherkassy Scientific Research Forensic Centre of the Ministry of Internal Affairs in Ukraine

http://orcid.org/0000-0002-2775-238X

 

DOI: https://doi.org/10.52363/2524-0226-2023-37-20

 

Keywords: fire-resistant steel structures, fire resistance assessment, numerical modeling, fire-resistant coatings, LIRA-SAPR

 

Аnnotation

 

A structural and logical scheme for ensuring the fire resistance of fire-resistant steel structures has been developed on the basis of the proposed mathematical model and the calculation-experimental method of evaluating the fire resistance of fire-resistant steel structures. The mathematical model differs from existing ones in the ability to determine the time to reach the critical temperature of a fire-resistant steel structure depending on the thickness of the fire-resistant coating, duration of fire exposure, fire scenario, given load level, thermophysical characteristics of steel and fire-resistant coating, as well as the possibility of using experimental values when conducting fire resistance tests both steel structures and reduced-size samples, which facilitates the procedure for evaluating fire resistance. It is advisable to use the model when calculating the fire resistance of fire-resistant steel structures as a result of the design of fire protection of steel structures. A computer model of the stress-strain state of a fire-resistant steel beam was developed in the LIRA-SAPR software to increase the level of fire safety of buildings and structures. A static calculation of a fire-resistant steel beam was carried out, as a result of which the stressed-deformed state of the beam was obtained under the combined effect of force and temperature loads. A comparison of the results of numerical modeling with the results of an experimental study of fire resistance was carried out. The accuracy of the developed computer model for evaluating the fire resistance of fire-resistant steel structures was verified. The parameters of the model are set, namely: thermophysical characteristics of fire-resistant coatings, thermophysical and mechanical properties of the materials that make up the structure, nonlinear laws of deformation of the model materials, strength and deformation properties of materials at high temperature and force effects, which allow with sufficient accuracy for engineering calculations (up to 3 %) to evaluate the fire resistance of fire-resistant steel structures.

 

References

 

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