The study of statically indeterminate reinforced concrete structures at the present stage is possible with the help of software systems capable of taking into account the nonlinear work of the material, which allows us to fully assess the stress-strain state for a different redistribution of emerging forces provoked by corrosion damage to reinforcement and concrete. Numerical studies of 14 models with corrosion damage in the upper section of a two-span beam in the Ansys software package have been performed. Load-deflection graphs are presented depending on the percentage of corrosion damage. The dependences of the redistribution of tensile forces in the beam reinforcement with different percentages of corrosion damage are shown. It is established that with damages up to 10%, there is a sharp increase in the tensile forces in the span reinforcement of the beams. It is determined that with corrosion damage to the beam up to 70%, the forces in the supporting reinforcement increase to 10%.
Keywords: reinforced concrete beam, redistribution of forces, plastic hinge, corrosion of reinforced concrete, numerical calculation, bearing capacity
The calculation of statically indeterminate structures, such as a two-span reinforced concrete beam in an elastic formulation does not reflect the actual force resistance, therefore, calculations of such structures are performed taking into account the occurrence of plastic deformations and the formation of plastic hinges, and the presence of local corrosion damage to concrete and reinforcement determines other dependencies of the redistribution of forces in the bent elements. The numerical calculation of 14 models with various corrosion damages along the length of the beam is performed. The dependence of the increase in deflections on the percentage of corrosion damage at various stages of loading is presented. The dependences of the redistribution of emerging forces in the span and supporting parts of a two-span beam on the percentage (length) of corrosion damage are shown. It was found that with 1% of damage at the initial stages of loading, there is a jump of tensile forces in the armature located in the span of the beam. It is determined that the greatest redistribution of tensile forces in the supporting part of the beam, which has 50-70% corrosion damage, is 11%.
Keywords: reinforced concrete beam, redistribution of forces, plastic hinge, corrosion of reinforced concrete, numerical calculation, bearing capacity
The recycling of industrial waste has always been relevant. In the modern world with the development of technology and the construction industry, it is necessary to find new opportunities for the disposal of industrial waste. One of the disposal options is to obtain synthetic anhydrite. Features of production and the finished product of processing make it difficult to use a binder for housing and civil construction. The study of the process of hardening of anhydrite binder and the properties of the resulting stone allows it to be used in different technologies for the manufacture of various building structures based on this binder.
Keywords: gypsum, anhydrite, synthetic anhydrite, industrial waste.
The article presents an analysis of promising research on the formation of vibrational mechanochemical coatings from the point of view of practical use in the real sector of the economy
Keywords: combined methods of treatment, vibration treatment, the vibration mechano-chemical (chemical-mechanical) coverage webrevolve technological system, mechanical coating, fragmentary nature, plastic deformation, uniform coating, vibrowave impact, microstructu