Boiko O. The Strength Estimation of Biaxial Bended Beams on the Basis of Two-linear Calculation Stress-strain Diagrams of Concrete and Reinforcement

The object - reinforced concrete beams of rectangular profile under biaxial bending; the purpose - determination of strength in the normal section of biaxial bended reinforced concrete beams on the basis of deformation model with the use of two-linear stress-strain diagrams of concrete and reinforcement; the methods - experimental researches in laboratory terms on the models of reinforced concrete beams with application of mechanical and electromechanical methods of measuring of deformations of materials; mathematical and physical design of process of destruction of biaxial bended reinforced concrete beams; the novelty - the calculation deformation model of mode of deformation of biaxial bended reinforced concrete beams is first created on the basis of two-linear stress-strain diagrams of concrete and reinforcement; the cases of calculation of strength of biaxial bended reinforced concrete beams are first formulated in accordance with the two-linear stress-strain diagrams of concrete and reinforcement; the dependences for determination of bending force in the normal section of biaxial bended reinforced concrete beams are received; the method of strength calculation of biaxial bended reinforced concrete beams is developed on the basis of two-linear stress-strain diagrams of materials; the method of determining the optimum amount of reinforcement of biaxial bended reinforced concrete elements is improved with the use of two-linear stress-strain diagrams of concrete and reinforcement; the possibility of application of two-linear stress-strain diagrams of concrete and reinforcement in calculations of strength of baixial bended elements is first experimentally confirmed; the results - the methods of calculation of strength and amount of reinforcement are developed and reduced to the engineering level; the introduction - in the project of the normative document and in the calculations of constructions of 2 objects in Poltava; the branch - building.