Introduction. From a geometric point of view, a water tower is a shell of rotation that has axial symmetry. For an axisymmetric system, it is possible to replace the spatial design scheme with a flat design scheme. This scheme can be used, among other things, under the action of arbitrary loads, such as wind loads and additional loads that arise when the structure tilts. Purpose of the study: Development and application of high-precision and cost-effective methods for analyzing the stress-strain state of combined axisymmetric systems using the example of a water tower. Research objectives: Development of mathematical models of asymmetrical loads, solution of practical problems arising during the installation and operation of water towers. Methods: orthogonal sweep method S.K. Godunov, Newton-Kantorovich method, finite element method, harmonic analysis, expansion of a function in Fourier series. Results: A method for analyzing the stress-strain state of combined systems using axisymmetric design schemes in the AXIS-Lq 2.1 program is considered using the example of a water tower. Mathematical models of wind loads and loads arising when a structure tilts are proposed, with the expansion of load functions in Fourier series. A dependence is proposed that approximates the graph of the aerodynamic coefficient. The Fourier coefficients for this dependence are found and the convergence of the trigonometric series is investigated. An example of using the AXIS-Lq 2.1 system for the finite element analysis of a Rozhnovsky water tower with a volume of 50 m3 is presented.
Reinforced concrete compressed elements with a small eccentricity and methods for calculating their strength are considered. A method for determining the deformation of the longitudinal reinforcement furthest from the longitudinal force is proposed. At the same time, the use of a single formula for s is ensured during the transition from an alternating deformation plot to an unambiguous one. Empirical dependence is used to determine the height of the compressed zone, which avoids solving the quadratic equation. In elements with a small eccentricity, symmetrical reinforcement is used, for this case the equation of equilibrium of longitudinal forces is derived.
The results of the study of the strength of slag-alkaline concrete depending on the amount of activator are presented. As an activator of slag-alkaline binders, the waste of caprolactam production of the Chirchik plant "Electrochemprom" was investigated. The best results were shown – ground granular phosphoric slags in a composition with an activator - sodium sulfocarbonate, which is recommended to be used to strengthen soils. The required strength class of soils can be obtained by adjusting the amount of slag, sulfocarbonate, as well as using various technological techniques.
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