D. Dubinin, А. Lisniak, S. Shevchenko, I. Gritsina, Yu. Gaponenko. Calculation method of assessing the condition of steel structures of buildings in the event of fire. С. 171-180.

 

Calculation method of assessing the condition of steel structures of buildings in the event of fire

 

Dmytro Dubinin

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0001-8948-5240

 

Andrei Lisniak

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0001-5526-1513

 

Serhii Shevchenko

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0002-6740-9252

 

Ihor Gritsina

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0002-2581-1614

 

Yuri Gaponenko

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0003-0854-5710

 

DOI: https://doi.org/10.52363/2524-0226-2023-37-12

 

Keywords: fire, rate of temperature change, steel structures, fire curves, fire retardant

 

Аnnotation

 

The object of the study is the process of assessing the condition of steel structures of buildings in the event of a fire. The use of standard fire curves, such as ISO 834, ASTM E119, which determine the temperature dependence over time, is substantiated and analyzed. Based on this, a calculation method for determining the rate of temperature change for protected and unprotected steel structures using fire curves is proposed. To protect steel structures from high temperature, such fire-resistant means as heat-insulating plates, plasterboard sheets and cement-sand plaster with appropriate tactical and technical characteristics were used. Based on the results of the study, it was established that the most effective fire protection means for steel structures are heat-insulating plates, and the least effective is cement-sand plaster. This is determined due to the difference in temperature, so according to ISO 834 for a heat-insulating board at 5 hours of exposure, the temperature is 896,2 ºС, and for plasterboard – 474,8 ºС, cement-sand plaster – 316,25 ºС. Thus, according to ASTM E119, for a heat-insulating board for 5 hours of exposure, the temperature is 869,85 ºС, and for plasterboard – 463,34 ºС, cement-sand plaster – 310,70 ºС. From the results of the research, it can be noted that the standard fire curves of ISO 834  and ASTM E119 make it possible to conduct research and determine the rate of temperature change, while it should be noted that they do not significantly differ from each other. Graphical dependences are also obtained for steel structures taking into account fire protection measures and standard fire curves ISO 834 and ASTM E119. The obtained results of the study make it possible to increase the level of fire safety of buildings and structures at the stages of design and operation, as well as to determine the limit (critical) state of steel structures in time during fire extinguishing operations.

 

References

 

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