TY JOUR TI BENDING CRACK RESISTANCE REINFORCED CONCRETE ELEMENTS OF TRAPEZOIDAL CROSS-SECTION BASED ON THE APPLICATION OF NONLINEAR DEFORMATION MODELS KW crack resistance KW deformation calculation model KW concrete state diagram KW chart stretching reinforcement KW bent elements KW trapezoidal cross-section KW numerical experiment JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Nikulin, A.I. AU Obernihin, D.V. AU Rubanov, V.G. AU Sventikov, A.A. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov