TY JOUR TI CONSTRUCTION OF A NOMOGRAM OF FIRE RESISTANCE OF METAL STRUCTURES ON THE BASIS OF THERMAL ENGINEERING CALCULATION KW fire resistance limit KW critical temperature KW standard fire mode KW weight increase KW nomogram KW metal structure KW profile JO Siberian Fire and Rescue Bulletin AU Medvedeva, L.V. AU Romanov, N.N. AU Simonova, M.A. PY 2023 IS 2023 PB FSBEE HE Siberian Fire and Rescue Academy EMERCOM of Russia