TY JOUR TI STRESS-STRAIN STATE OF SLIP-CRITICAL CONNECTIONS IN METAL STRUCTURES, WITH REGARD TO THE SPECIFICS OF BOLT TENSION CONTROL KW slip-critical connection KW bolted joint KW bolt pretensioning KW high-strength bolts KW steel high-strength bolted connection JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Vasilkin, A.A. AU Zubkov, G.V. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov