Usenko N. Сalculation method of formation inclined cracks in reinforced concrete composite constructions.

Object - the composite reinforced concrete constructions of industrial and civil buildings and facilities; purpose - the development of computational models of the inclined cracks formation in reinforced concrete composite constructions based on the analysis and synthesis experiments, building working hypotheses that the actual stress-strain state reflect best in view of its disturbances in joints with conventional lumped averaged displacements, incompatible strains of concrete and armature and the discontinuity effect of concrete; novelty - it's built a computational model of the inclined cracks formation in composite reinforced concrete constructions, taking the incompatible strain of concrete and armature, contingent focused shifts in the seam between the concrete and physically nonlinear deformation taking into the effect of cracks and discontinuities concrete, longitudinal force, and local prestressing force fields; it's calculated second-level scheme to determine the relative deformations of concrete along the axes of the transverse reinforcement between the inclined cracks of three types; it's obtained experimental data on the nature and effects of deformation, emerging, development and disclosure of inclined cracks in reinforced concrete composite constructions; it's proposed the calculation algorithm for determining the two-level fracture and the corresponding stress-strain state in the span "section" of the composite construction.; results - were used in the development of the national standard of Ukraine DSTU B B.2.6-XXX: 201X "Monolithic reinforced concrete constructions of buildings and facilities" in parts of the requirements for the calculation and strengthening reinforced concrete constructions, in the calculation of composite reinforced concrete constructions in the project of a residential 32-storey building with residential spaces at Zhilyanskaya, 118 street, Kiev and implemented in the educational process of the National Aviation University for study disciplines "Reinforced concrete and stone construction," "Reconstruction buildings and facilities of the airports " for students, studying by speciality "Industrial and civil engineering";industry - construction.