%0 Journal Article %T ON THE NEED TO REFINE THE CALCULATION METHODOLOGY FOR ASSESSING THE FIRE RESISTANCE LIMITS OF METAL STRUCTURES, TAKING INTO ACCOUNT THE DURATION OF THEIR OPERATION %A Shakhabov, M.M. %A Sivenkov, A.B. %K steel structures, fire resistance limit, service life, aging, standard resistance, tensile strength, modulus of elasticity %J Problems of risk management in the technosphere %D 2024 %N 2024 %P 12 %I Saint-Petersburg University of State Fire Service of Emercom of Russia