TY JOUR TI THE STRENGTH AND THE CRACK RESISTANCE OF THE BENT REINFORCED CONCRETE TRAPEZOIDAL CROSS-SECTION ELEMENTS WITH THE WIDE LOWER BOUND KW strength KW crack resistance KW deformation calculation model KW concrete state diagram KW tension reinforcement diagram KW bent element KW a trapezoidal cross-section JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Obernihin, D.V. AU Nikulin, A.I. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov