TY JOUR TI NUMERICAL STUDY OF STRENGTH, FRACTURE TOUGHNESS AND DEFORMATIVNOSTI OF STEEL REINFORCED CONCRETE ELEMENTS OF TRAPEZOIDAL CROSS-SECTION KW strength KW deformability KW crack-resistance KW trapezoidal cross-section KW flexure reinforced concrete element KW ratio of reinforcement KW concrete class KW reinforce class JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Obernihin, D.V. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov