Abstract
Test methods given in EN 13381-4:2013 and EN 13381-8:2013 standards serve to assess the fire-protective capacity of materials for steel structures. The results of the tests determine data on minimum thickness of fire-protective materials used further in design of steel structures. The tests are very time consuming. They require significant costs for creation of standardized samples and conduction of tests. At the same time, there are methods, which propose to use samples of reduced sizes and of other shapes than sizes and shapes of standardized samples. There is an actual question about possibility of application of methods with samples of reduced sizes as an alternative to EN 13381-4:2013 and EN 13381-8:2013 methods.The study investigated the convergence of results of assessment of the fire-protective capacity of two types of fire-protective materials for steel structures obtained in tests on standardized samples and tests on samples of reduced sizes. We established that values of the minimum thickness for reactive fire-protective material obtained from the test data on samples of reduced sizes are predominantly larger than values for standardized samples. Values of the minimum thickness for passive fire-protective material obtained using standardized samples are mainly large. The difference between the minimum thickness of reactive fire-protective material obtained on samples of reduced size and standardized samples reaches 79.0 %, and it is 62.5 % for a passive fire-protective material. Such difference of values indicates that it is impossible to use samples of reduced sizes for assessment of the fire-protective capacity of materials for steel structures for all ranges of reduced thickness of a steel profile, critical steel temperature and the normalized threshold of fire resistance of structures listed in EN 13381-4: 2013 and EN 13381-8: 201
Highlights
One of the main requirements for buildings and structures is to maintain the bearing capacity of building structures during a fire
The feature is the fact that the investigated fire-protective materials provide different ranges of the normalized fire resistance threshold of steel structures: from 30 minutes to 90 minutes for reactive fire-protective material and from 45 minutes to 240 minutes for passive fire-protective material
The values of reduced thickness of a steel profile, critical temperature of steel and a normalized threshold of fire resistance of a steel structure affect the value of the minimum thickness of fire-protective materials significantly
Summary
One of the main requirements for buildings and structures is to maintain the bearing capacity of building structures during a fire. Authors of work [14] provided data on convergence of experimental data on duration of a fire impact to reaching the critical temperature of steel for standardized samples and samples of reduced sizes These data are for the “Endotherm 400202” [15] reactive fire-protective material, which swells under a heat impact under fire conditions, and for the “Endotherm 210104” passive fire-protective material (plates) [16]. The results obtained in work [14] showed the satisfactory convergence of experimental data on duration of a fire impact to reaching the critical temperature of steel for standardized samples [1, 2] and samples of reduced sizes [5] This makes possible to use samples of reduced sizes to assess a thermal state of protected steel structures under standard temperature mode instead of standardized samples. We have reasons to believe that lack of certainty in the question about an influence of a shape and size of samples for tests of protected steel structures (hereinafter – test parameters of samples) on results of assessment of the fire-protective capacity of materials necessitates the study in this direction
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Eastern-European Journal of Enterprise Technologies
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
