RIGIDITY OF REINFORCED CONCRETE STRUCTURES UNDER COMPLEX RESISTANCE

Statement of the problem. The article provides an approximation of rectangular cross-sections using small squares in the elements a pq of the matrix.Results. From the rigidity characteristics, forward (for internal forces) and reverse transition hasbeen obtained, - the known curvature, twisting angle, linear deformations and displacement fromshear force, including in elastoplastic compressed concrete, crack opening widths and shears. The stages of reinforced concrete during the formation of spatial cracks in works from experimental studies have been determined. The authors have got the convergence of physical phenomena and models of the theory of reinforced concrete. In the strips between the cracks, for the shear of the crack edges for their linear rigidity along the entire length of the crack, there is force “meshing” or a new effect of reinforced concrete in the works of Vl. I. Kolchunov. The forces in the longitudinal stretched reinforcement in the works of N.I. Karpenko, the parameters of the distance between the cracks l crc and the coefficient ψс of V. I. Murashev, taking into account the effect of the coupling of reinforcement with concrete on its deformation on pliability, have been obtained based on the analysis of horizontal - normal ( U s) and vertical - tangential ( V s) displacements. The "dowel" force was determined for the ratio of normal stresses (and area) of reinforcement to experimental coefficients.Conclusions. As a result, the rigidity physical characteristics have been obtained in the system of equations, where the elements of the rigidity matrix have been developed for the compressed area of concrete and working reinforcement from the equations (static, geometric and physical).