TY JOUR TI EXPERIMENTAL STUDIES OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH STEEL FIBER JACKET KW reinforcement KW steel fiber reinforced concrete KW flexible element KW experimental studies KW design errors JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Radaikin, O.V. AU Sharafutdinov, L.A. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov