INNOVATIVE APPROACH TO THE EXPERIMENTAL REPRODUCTION OF NOMINAL AND ALTERNATIVE FIRE REGIMES

R. VESELIVSKYI; V. KOVALYSHYN; R. YAKOVCHUK; A. HAVRYS; A. TARNAVSKYI

doi:10.15407/scine22.03.066

Authors

R. VESELIVSKYI Lviv State University of Life Safety https://orcid.org/0000-0003-3266-578X
V. KOVALYSHYN Lviv State University of Life Safety https://orcid.org/0000-0002-5463-0230
R. YAKOVCHUK Lviv State University of Life Safety https://orcid.org/0000-0001-5523-5569
A. HAVRYS Lviv State University of Life Safety https://orcid.org/0000-0003-2527-7906
A. TARNAVSKYI Lviv State University of Life Safety https://orcid.org/0000-0002-4625-2022

DOI:

https://doi.org/10.15407/scine22.03.066

Keywords:

fire resistance, fire protection, nominal and alternative fire modes, building structure, test facility, electric heating element

Abstract

Introduction. The prevention of the destruction of buildings and structures during a fire is ensured through
strict compliance with requirements for the necessary fire resistance rating and classifi cation. To guarantee reliable and safe operation during the design and construction stages, building materials and structures classified according to their reaction to fire and assessed by fire resistance class have been required.
Problem Statement. Since modern testing installations (furnaces) predominantly reproduce only the
temperature regime of a standard fire, while other heating regimes remain difficult or impossible to simulate, the development and application of specialized testing installations and chambers capable of experimentally providing the required temperature exposures are highly relevant.
Purpose. The purpose of this study is to investigate the possibility of experimentally reproducing the temperature effects of nominal and alternative fire regimes using an innovative experimental installation.
Materials and Methods. The study has been conducted using an installation equipped with a 500 × 500 × 500 mm chamber designed to assess the fire-protective efficiency of coatings. The test specimens consist of 500 × 500 mm steel plates with fire-protective coatings. External fire, slow-heating fire, and parametric fire regimes have been modeled by regulating the power of the heating elements and adjusting the distance between the heating elements and the specimen. The parametric temperature curve for
a 60 m² fire compartment has been calculated using the FIN EC soft ware package.

Results. Experimental tests have confirmed the effectiveness of reproducing nominal and alternative fire regimes using the developed installation. The design features and technical solutions have provided cont rolled regulation of chamber heating and cooling, ensuring that deviations of the temperature–time curves remain within permissible limits according to DSTU EN 1363-1:2023 and DSTU EN 1363-2:2023.
Conclusions. The stable operation of the electric heating elements has ensured effective reproduction of thermal
regimes with deviations of less than 10% from standard fire curves. The developed installation has demonstrated its
applicability for assessing the fire resistance of structures, determining the effectiveness of fire-protective coatings, and developing experimental and theoretical methods for studying the thermophysical properties of materials under nominal and alternative (realistic) fire regimes.

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