TY JOUR TI TORSION OF LOWER BELT OF CRANE SECONDARY TRUSS KW torsion KW angle of rotation KW angular compliance KW thin-walled section KW stress-strain state JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Markina, Y.D. PY 2023 IS 8 PB Belgorod State Technological University named after V.G. Shukhov