ESTIMATION OF THE EFFICIENCY OF APPLICATION OF LIGHT STEEL THIN-WALLED STRUCTURES IN TOWER STRUCTURES

2021 ◽  
pp. 26-48
Author(s):  
С. В. Ефрюшин ◽  
А. Р. Ефанов
Keyword(s):  
Fluid Flow ◽  
Comparative Analysis ◽  
Wind Pressure ◽  
Wind Flow ◽  
Aerodynamic Loads ◽  
Thin Walled Structures ◽  
Average Wind ◽  
Deformation Properties ◽  
Thin Walled ◽  
Ansys Workbench

Постановка задачи. Исследовать семь реально изготавливаемых на сегодняшний день профилей легких стальных тонкостенных конструкций (ЛСТК) на воздействие статических, а также аэродинамических нагрузок с целью нахождения наиболее эффективного для элементов башенного типа сооружений. Результаты. Осуществлен отбор реально изготавливаемых профилей ЛСТК. Проведен сравнительный анализ данных профилей по несущей способности и деформационным свойствам при помощи программного комплекса Ansys Workbench. Описана методика моделирования и определения среднего ветрового давления на профиль при помощи расчётно-вычислительного комплекса Ansys Fluid Flow (Fluent). Проведен сравнительный анализ профилей ЛСТК по среднему ветровому давлению и характеру обтекания профилей ветровым потоком. Сделан вывод о наиболее эффективных профилях ЛСТК для элементов башенного типа сооружений. Выводы. В ходе исследования была рассмотрена методика определения среднего ветрового давления при помощи расчётно-вычислительного комплекса Ansys Fluid Flow (Fluent). С учетом выборки профилей по несущей способности и деформационным свойствам (профили №1,2,4,6,7) и выборки профилей по среднему ветровому давлению и характеру обтекания профилей ветровым потоком (профили № 2-5) сделан вывод о том, что наиболее эффективными для элементов башенного типа сооружений и восприятия воздействия статических и аэродинамических нагрузок являются профили ЛСТК под номером 2 и 4 (рис. 2,4). Problem statement. To investigate seven actually manufactured profiles of light steel thin-walled structures (LSTS) for the effect of static and aerodynamic loads in order to find the most effective structures for tower-type elements. Results. The selection of actually manufactured LSTS profiles has been carried out. A comparative analysis of these profiles for bearing capacity and deformation properties was carried out using the Ansys Workbench software package. A technique for modeling and determining the average wind pressure on a profile using the Ansys Fluid Flow (Fluent) computational complex is described. A comparative analysis of the LSTS profiles by the average wind pressure and the nature of the wind flow around the airfoils is carried out. A conclusion is made about the most effective LSTS profiles for tower-type elements of structures. Conclusions. In this study, a method for determining the average wind pressure using the Ansys Fluid Flow (Fluent) computational complex was considered. Taking into account the sample of profiles for the bearing capacity and deformation properties (profiles No. 1,2,4,6,7) and the sample of profiles for the average wind pressure and the nature of the wind flow around the profiles (profiles No. 2-5), it was concluded that the most LSTS profiles numbered 2 and 4 (Fig. 2.4) are effective for tower-type elements of structures and for the perception of the effect of static and aerodynamic loads.

Comparative Analysis of Methods for Calculating Cold-Formed Steel Structures

2018 ◽  
Vol 931 ◽  
pp. 188-195
Author(s):  
Alexey A. Reshetnikov ◽  
Vladislav Y. Kornet ◽  
Darya A. Leonova
Keyword(s):  
Comparative Analysis ◽  
Cross Section ◽  
Block Diagram ◽  
Steel Structures ◽  
Solution Algorithm ◽  
American Institute ◽  
Thin Walled Structures ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Shaped Cross Section

This article presents a comparative analysis of methods for calculating cold-formed steel structures, or light steel thin-walled structures (LSTS), as they are called in Russia, according to domestic and foreign norms. For comparison, the calculation provisions for SR 260.1325800.2016 "Steel thin-walled constructions from cold-bent galvanized sheets" and AISI (American Institute of Ferrous Metallurgy) were taken. For clarity of the solution algorithm, a block diagram for each method is presented. Specific features of calculating the C-shaped cross-section for bending by both methods are indicated [1].

Frame-Monolithic Technology of Construction of Low-Rise Buildings Made of Foam Gypsum and Steel Thin-Walled Structures

2018 ◽  
Vol 762 (8) ◽  
pp. 36-39 ◽  
Author(s):  
B.G. BULATOV ◽  
◽  
R.I. SHIGAPOV ◽  
M.A. IVLEV ◽  
I.V. NEDOSEKO ◽  
...  
Keyword(s):  
Thin Walled Structures ◽  
Thin Walled

scholarly journals Fracture Mechanical Analysis of Thin-Walled Cylindrical Shells with Cracks

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 592
Author(s):  
Feng Yue ◽  
Ziyan Wu
Keyword(s):  
Fracture Mechanics ◽  
Tensile Stress ◽  
Failure Modes ◽  
Cylindrical Shells ◽  
Crack Tip ◽  
Mechanical Analysis ◽  
J Integral ◽  
Thin Walled Structures ◽  
Circumferential Tensile Stress ◽  
Thin Walled

The fracture mechanical behaviour of thin-walled structures with cracks is highly significant for structural strength design, safety and reliability analysis, and defect evaluation. In this study, the effects of various factors on the fracture parameters, crack initiation angles and plastic zones of thin-walled cylindrical shells with cracks are investigated. First, based on the J-integral and displacement extrapolation methods, the stress intensity factors of thin-walled cylindrical shells with circumferential cracks and compound cracks are studied using linear elastic fracture mechanics, respectively. Second, based on the theory of maximum circumferential tensile stress of compound cracks, the number of singular elements at a crack tip is varied to determine the node of the element corresponding to the maximum circumferential tensile stress, and the initiation angle for a compound crack is predicted. Third, based on the J-integral theory, the size of the plastic zone and J-integral of a thin-walled cylindrical shell with a circumferential crack are analysed, using elastic-plastic fracture mechanics. The results show that the stress in front of a crack tip does not increase after reaching the yield strength and enters the stage of plastic development, and the predicted initiation angle of an oblique crack mainly depends on its original inclination angle. The conclusions have theoretical and engineering significance for the selection of the fracture criteria and determination of the failure modes of thin-walled structures with cracks.

Multi-physics modeling of direct energy deposition process of thin-walled structures: defect analysis

2021 ◽  
Vol 67 (4) ◽  
pp. 1229-1242
Author(s):  
Shuhao Wang ◽  
Lida Zhu ◽  
Yichao Dun ◽  
Zhichao Yang ◽  
Jerry Ying Hsi Fuh ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Deposition Process ◽  
Defect Analysis ◽  
Direct Energy Deposition ◽  
Thin Walled Structures ◽  
Direct Energy ◽  
Thin Walled ◽  
Physics Modeling

scholarly journals On the theory and practice of thin-walled structures

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tamaz Vashakmadze
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Complex Analysis ◽  
Theory And Practice ◽  
Linear Case ◽  
Wide Sense ◽  
Partial Differential ◽  
Thin Walled Structures ◽  
Thin Walled

Abstract The basic problem of satisfaction of boundary conditions is considered when the generalized stress vector is given on the surfaces of elastic plates and shells. This problem has so far remained open for both refined theories in a wide sense and hierarchic type models. In the linear case, it was formulated by I. N. Vekua for hierarchic models. In the nonlinear case, bending and compression-expansion processes do not split and in this context the exact structure is presented for the system of differential equations of von Kármán–Mindlin–Reisner (KMR) type, constructed without using a variety of ad hoc assumptions since one of the two relations of this system in the classical form is the compatibility condition, but not the equilibrium equation. In this paper, a unity mathematical theory is elaborated in both linear and nonlinear cases for anisotropic inhomogeneous elastic thin-walled structures. The theory approximately satisfies the corresponding system of partial differential equations and the boundary conditions on the surfaces of such structures. The problem is investigated and solved for hierarchic models too. The obtained results broaden the sphere of applications of complex analysis methods. The classical theory of finding a general solution of partial differential equations of complex analysis, which in the linear case was thoroughly developed in the works of Goursat, Weyl, Walsh, Bergman, Kolosov, Muskhelishvili, Bers, Vekua and others, is extended to the solution of basic nonlinear differential equations containing the nonlinear summand, which is a composition of Laplace and Monge–Ampére operators.

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