TY JOUR TI VERIFICATION OF THE TEST PROCEDURE FOR A REINFORCED CONCRETE ELEMENT DURING BENDING WITH TORSION IN LONG-TERM OPERATION KW reinforced concrete structures with external composite reinforcement KW torsion resistance with bending KW strength calculation KW complex stress–strain state KW spatial crack JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Merkulov, S.I. AU Suleymanova, L.A. AU Esipov, S.M. AU Kashuba, S.O. AU Lesovik, G.A. PY 2024 IS 9 PB Belgorod State Technological University named after V.G. Shukhov