Vol. 27, Number 2, 2021

Кirill Kutaitsev, Sergey Titkov, Аnton Tanasoglo, Roman Ignatenko
Optimal Design of a Chimney-Type Cooling Tower with an Irrigation Area of 1 600 m2 Taking into Account the Peculiarities of Wind Exposure
Donbas National Academy of Civil Engineering and Architecture
Abstract. This article provides an overview of the current state of the research topic; analysis of the features of collecting loads and calculating steel cooling towers according to domestic standards. The main combinations of loads are given, taking into account the duration of their impact on the cooling tower. The study of the dynamic properties of a steel cooling tower is carried out using finite element modeling, taking into account the variability of the parameters of the structural shape. The features of the dynamic effect of the wind are given, taking into account forced (pulsation) and natural vibrations for the inadmissibility of resonance. Optimal design of a grid cooling tower with an irrigation area of 1 600 m2, taking into account the peculiarities of wind exposure. The mathematical definition of the optimization model in the form of a task and an indication of the goal at which it will be performed is made. The optimization problem is presented in the block diagram on the basis of the software package created in DNACEA. After performing the optimization calculation and taking into account the real model, solid-state modeling was performed in the Tecla PC, as well as indications for the optimization results were given.
Keywords: analysis of load collection features, study of the dynamic properties of a steel cooling tower, optimal design of a lattice cooling tower.

Sergey Mishura, Andrey Mironov, Pavel Solovey, Roman Kopachev, Vladislav Avsievich
Fullbscale Survey of the V = 3,000 m3 CR for the Storage of Sunflower Oil
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article discusses the oil storage tank «O2», located on the territory of the branch № 1 of the state corporation for the development and implementation of modern technologies «DONETSK TECHNOLOGIES». An analysis of the existing structures of the «O2» tank was carried out, and damage received during operation was found. In the design of the shell of the tank «О2» there are areas in which there is a local loss of stability in the form of concavities in the interior of the tank (flappers). The bottom structure has a curvature associated with the uneven draft of the tank. This article presents a test calculation aimed at checking the tank shell for strength and stability. In connection with the damage received during the operation of this structure, recommendations were given for the elimination and minimization of certain defects and damage.
Keywords: cylindrical tanks, deformations, complex studies, flappers, shell, utorny seam.

Sergey Titkov, Anatoly Yugov, Vladimir Vasylev, Lozinsky Eduard
Physical Modeling and Analysis of the Effect of Wind Flow Around a Freestanding Metal Chimney-Type Cooling Tower
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article presents an analysis of similarity criteria for physical modeling of wind flow around a free-standing metal chimney-type cooling tower of hyperbolic shape. Various methods of studying the influence of wind flow on the exhaust tower of a metal cooling tower are presented, such as strain-gauge weight studies, the method of model drainage, methods of visualization of wind flow velosimetry or shadow method, the method of silkworms. The results were obtained for each of the listed research methods. An in-depth analysis of the research results was carried out, an explanation was given on the application of each of the methods, and a comparison of the methods was performed. This work was carried out in order to find the actual plots of wind impact on a hyperbolic tower frame-sheathing metal cooling tower during operation to identify the most unfavorable calculated situations of wind impact.
Keywords: metal chimney_type cooling tower, hyperbolic shape, strain gauge scales, local coefficient, velocimetry, shadow method.

Volodymyr Mushchanov, Evgeniy Konopatskiy, Vladimir Shpinkov, Alexandra Krysko
Features of the Joint Operation of the Reinforcing Element with a Flat Cylindrical Momentary Shell under the Action of a Transverse Load
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article considers thin-sheet membrane coatings in the form of a flat and cylindrical shell of zero Gaussian curvature, supported by a stiffness element on a rectangular plan. An analytical description of geometric models of a thin-sheet membrane coating on a rectangular plan and stiffeners in the form of an I-beam curved in one direction is given, on the basis of which computer models of thin-sheet membrane surfaces and reinforcing elements are obtained, taking into account the necessary density of rectangular finite elements for importing into the system of finite element analysis of the stress-strain state of SCAD Office structures with further numerical experiment. The obtained results allow us to estimate, on the basis of refined approaches, the dimensions of the section of a thin-sheet membrane plate involved in joint work for transverse bending with a reinforcing element, depending on the ratio of their stiffness changes in the curvature of the surface.
Keywords: thin-sheet membrane, reinforcing element of rigidity, stress-strain state, transverse load, normal stresses, bending moment, gaussian curvature, cylindrical surface, computer model of the surface, point equation, mathematical model.