TY JOUR TI FLAT ROLL ROOFS LIFE CYCLE MANAGEMENT IMPROVING WITH ADVANCED TECHNICAL STATE INSPECTION KW flat rolled roofs KW physical deterioration KW physical deterioration assessment KW defect KW defect ratio KW hierarchy analysis process JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Dolzhenko, A.V. AU Naumov, A.E. AU Shchenyatsky, O.A. PY 2023 IS 8 PB Belgorod State Technological University named after V.G. Shukhov