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
- Franssen J. M., Gernay T. Modeling structures in fire with SAFIR®: Theoretical background and capabilities. Journal of Structural Fire Engineering. 2017. Vol. 8(3). Р. 300–323. doi: 10.1108/JSFE-07-2016-0010
- Yew M. C., Ramli Sulong N. H. Fire-resistive performance of intumescent flame-retardant coatings for steel. Materials and Design. 2012. Vol. 34. Р. 719–724. doi: 10.1016/j.matdes.2011.05.032
- Nadjai A., Petrou K., Han S., Ali F. Performance of unprotected and protected cellular beams in fire conditions. Construction and Building Materials. 2016. Vol. 105. P. 579–588. doi:URL: 10.1016/j.conbuildmat.2015.12.150
- Li G. Q., Han J., Lou G. B., Wang Y. C. Predicting intumescent coating protected steel temperature in fire using constant thermal conductivity. Thin-Walled Structures. 2016. Vol. 98. Р. 177–184. doi: 10.1016/j.tws.2015.03.008
- Kovalov A., Otrosh Y., Chernenko O., Zhuravskij M., Anszczak M. Modeling of non-stationary heating of steel plates with fire-protective coatings in Ansys under the conditions of hydrocarbon fire temperature mode. In Materials Science Forum. 2021. Vol. 1038 MSF. P. 514–523. Trans Tech Publications Ltd.
- Kovalov A., Slovinskyi V., Udianskyi M., Ponomarenko I., Anszczak M. Research of fireproof capability of coating for metal constructions using calculation-experimental method. In Materials Science Forum. 2020. Vol. 1006 MSF. P. 3–10.
- Džolev I., Radujković A., Cvetkovska M., Lađinović Đ., Radonjanin V. Fire analysis of a simply supported steel beam using Opensees and Ansys Workbench. In 4th International Conference Contemporary Achievements in Civil Engineering, Subotica. 2016. Vol. 22. P. 315–322.
- Both I., Wald F., Zaharia R. Benchmark for numerical analysis of steel and composite floors exposed to fire using a general purpose FEM code. Journal of Applied Engineering Science. 2016. Vol. 14(2). P. 275–284. doi: 10.5937/jaes14-8664
- Yan X., Gernay T. Local buckling of cold-formed high-strength steel hollow section columns at elevated temperatures. Journal of Constructional Steel Research. 2022. Vol. 196. doi: 10.1016/j.jcsr.2022.107403
- Morys M., Häßler D., Krüger S., Schartel B., Hothan S. Beyond the standard time-temperature curve: Assessment of intumescent coatings under standard and deviant temperature curves. Fire Safety Journal. 2020. Vol. 112. doi: 10.1016/j.firesaf.2020.102951
- Song Q. Y., Han L. H., Zhou K., Feng Y. Temperature distribution of CFST columns protected by intumescent fire coating. Ninth International Conference on Advances in Steel Structures (ICASS’2018) Hong Kong Institution of Steel Construction. doi: 10.18057/ICASS2018.P.164
- Sadkovyi V., Andronov V., Semkiv O., Kovalov A., Rybka E., Otrosh Yu. et. al. Fire resistance of reinforced concrete and steel structures. Kharkiv: РС ТЕСHNOLOGY СЕNTЕR, 2021. 180 р. doi: 10.15587/978-617-7319-43-5