TY JOUR TI STRUCTURE OPTIMIZATION OF THE METAL TRUSSES KW truss structure KW variational statement of problem KW optimization criterion JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Yur'ev, A.G. AU Zin'kova, V.A. AU Smolyago, N.A. AU Yakovlev, O.A. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov