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    Research on the Dynamic Characteristicsof A Water Tower
    (Державний науково-дослідний інститут будівельних конструкцій, Київ, 2026) Bannikov, Dmytro O.; Bakan, Ihor M.
    ENG: Providing the population with high-quality water is becoming an increasingly urgent task for Ukraine at the present time. This is due to both the pollution of existing water sources on the one hand and the constant military threat on the other. Water towers in such conditions perform functions related not only to the transportation of drinking water, but also to its temporary storage. Wind load is the main type of load that determines the dynamic stability of such high-rise structures. However, specialized regulatory and professional literature contains rather limited information on the dynamic behavior of water towers. Therefore, their engineering design does not take into account certain aspects of the structure's operation. The main purpose of the research is to analyze the dynamic behavior of a water tower using the example of a steel structure located in the city of Mykolaiv. The object considered was an emergency water supply water tower with a steel tank with a diameter of 18 m and a total capacity of 620 m3. The supporting part of the tower is a central shaft supported by struts. The total height of the tower is 48.7 m. During the research, two main design options proposed by engineers were considered - a variant with additional struts (the main variant) and without additional struts. The finite element method was used to conduct the research based on the ANSYS 14.5 design and computing complex for Windows with the ANSYS CFD FLUENT additional module. Analysis of the obtained computer simulation results showed that the design option with the arrangement of the struts is aerodynamically unstable - the limiting frequency of Karman vortex breakdown (0.648 Hz), even with the arrangement of decorative aerodynamic elements, is lower than the calculated one. Therefore, it is proposed to make the tower shaft in the form of a hyperbolic paraboloid of negative Gaussian curvature, which brings the dynamic spectrum of the structure into a safe zone. Such a design solution should be patented.