TY JOUR TI APPLICATION OF A SPECIAL FINITE ELEMENT OF A MIXED METHOD FOR CALCULATION OF STEEL STRIPE SYSTEM STRENGTHENING KW special finite element KW mixed method KW reinforcement by section extension KW response matrix JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Tukhfatullin, B.A. AU Puteeva, L.E. AU Grigor'ev, A.I. AU Rakov, V.D. PY 2018 IS 3 PB Belgorod State Technological University named after V.G. Shukhov