RESEARCH HEATING OF THE FIRE-PROTECTED STEEL I-BEAM RODS DURING STANDARD TEMPERATURE FIRE MODE TESTS
Abstract
In the article the analysis of experimental fire tests for establishment of a limit of fire resistance of steel columns with fire-retardant mineral wool covering is carried out. The scientific novelty of this study is to develop a method of manufacturing and forming samples of steel columns with fire-retardant mineral wool coating, to develop a method of conducting fire tests to establish patterns the dependence of the time of onset of the limit state of loss of bearing capacity of steel columns with fire-retardant cladding.
The subject of the study is the influence of design parameters of fire-retardant cladding on the results of the estimated assessment of fire resistance of steel columns under the influence of the standard fire temperature mode. The main task of the research reflected in this article was to identify the peak time of a critical temperature of a fire-retardant steel structure depending on the thickness of the mineral wool coating. The article also reflects the test results of samples of steel columns with different thickness of fire-retardant cladding based on mineral wool coating, which were carried out in accordance with the developed methodology of experimental studies. The regularities of time indicators on the loss of bearing capacity of the tested samples of steel columns with fire-retardant cladding depending on the exposure time of the samples under the influence of the standard temperature of the fire.
The obtained research results will allow to create a mathematical model for predicting the dependence of the time of reaching the critical temperature of the steel structure depending on the thickness of the fire-retardant cladding. The constructed mathematical model can be considered as a scientific basis for the creation of new engineering methods of calculation for the assessment of fire resistance of steel structures with fire-retardant mineral wool coating. Such engineering and calculation techniques allow to improve the regulatory framework for the design of fire-resistant steel structures.
