Abstract
The paper discusses the issue of estimating the fire resistance limits of metal structures taking into account the duration of their operation. The results of the study of the influence of the duration of operation on the mechanical characteristics of steel structures, such as the ultimate strength, the yield strength and the relative elongation are presented. The study was conducted on a steel structure with a service life of more than 80 years. The results of static tensile mechanical tests showed that the ultimate tensile strength for the steel specimens in question is at a minimum level (a decrease in ultimate strength of 10–15 % or more). The conceptual opinion about the necessity of taking into account the change of strength and yield strength when assessing the fire resistance limits of steel structures of different service life has been expressed.
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