Comparative analysis of laboratory methods of definition of characteristics of fire resistance and fire durability of steel elements of load-bearing construction and the actual conditions of thermomechanical influences in fire condition
Journal Title: Metallurgical and Mining Industry - Year 2017, Vol 9, Issue 6
Abstract
The Objective isto substantiate the need to improve the methods for determining the characteristics of fire resistance and fire durability of steel elements of load-bearing construction and to offer new schemes for these methods.Methodology isbased on a comparative analysis of existing methods for determining the characteristics of fire resistance and fire durability and the actual conditions of thermal influences on steel elements of load-bearing construction in fires, new schemes of the considered methods are developed and justified.New schemes of methods for determining fire resistance and fire durability characteristics under laboratory conditions are presented;these schemes take into account substantially the real conditions of thermal influences on steel elements of load-bearing construction in fires and the results of such influences. Scientific novelty consists in the fact thatfor the first time in the offered methods, the actual formation of a stressed state in the steel elements of load-bearing construction is taken into account in case of fires and under cooling conditions after them. There appears the need to use various loading schemes to determine the complex of properties; different heating and cooling rates; determination of not only the characteristics of the resistance to deformation, but also to fracture; the determination of the latter not only at ordinary but also at low temperatures; individual approach in determining the characteristics of fire resistance and fire durability, depending on the type of construction.The paper possesses the following practical significance. By definition, the offered methods for determining the characteristics of fire resistance and fire durability should ensure obtaining of substantially more adequate characteristics of the actual fire resistance and fire durability of steel elements of load-bearing construction and, consequently, of the load-bearing construction itself, when this information is included in the relevant regulatory documentation for calculating fire resistance and fire durability of construction and structures. The use of fire resistance and fire durability characteristics obtained with new methods in the development of new steel grades with an appropriate structural state – in conjunction with the above – will raise the level of fire resistance of various structures, which usesteel load-bearing construction.
Authors and Affiliations
Yuriy Gul, Aleksandr Ivchenko, Pavel Kondratenko, Valentina Chmeleva, Galina Perchun
Keywords
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