TY JOUR TI DESIGN OF BOLTED FLANGE CONNECTIONS UNDER CONDITIONS OF PLASTIC DEFORMATION DEVELOPMENT KW steel structures KW bolted flange connections KW plastic deformation KW bending rigidity KW load-bearing capacity KW ultimate deformation. JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Sun', G.. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov