Igor Garanzha, Anton Tanasoglo, Zhanna Voitova, Sofiia Garanzha
Numerical Researches Complex of Multifaceted Composite Elements under Axial Compression
Donbas National Academy of Civil Engineering and Architecture
Abstract. In the article the relevance of creating multifaceted pipe-concrete structures (MPCS), associated with the possibility of their use in urban construction as structures that meet high modern demands for their aesthetics and low land allocation has been considered. It has been given the features of a computational finite element model of such structures in ANSYS, which consist in the possibility of nonlinear materials simulation, taking into account contact interaction between them, the use of special types of finite elements that can help to correct numerically describe the structures work under load, and also the principles of the restrictions of degrees of freedom for a structural model. The analytical methods for determining the nonlinearity parameters of the used materials, as well as the physical and mechanical properties of a confined concrete have been described. At specific examples numerically it has been identified and analyzed the changing of MPCS load capacity under various conditions of materials adhesion (a friction coefficient μ varied in the range 0.1…0.6), and also the changing of steel and concrete deposit level to the total load capacity of the composite structure as a whole. It has been analyzed «the unified» analytical method for determination of the MPCS load capacity with indicating the degree of variability of the compressive limit load depending of the number of face variation and the thickness of a metal wall of the multifaceted model.
Keywords: multifaceted composite structures, self-compacting concrete, axial compression, load capacity, nonlinear material, steel isotropic hardening, Mander model, Criteria plasticity of Drucker–Prager, contact between materials, friction coefficient.
Alexander Golikov a, Anna Zhelibovskaya b
Rational Structural Decisions Load-Bearing Supporting Structures Dome Diameter 15 m
a Volgograd State University of Architecture and Civil Engineering,
b Kurskgrazhdanproekt
Abstract. Based on a critical analysis of the experience of the design and construction of domes, the most common designs bearing dome structures have been determined. The calculation of the domes and the analysis of the stress and strain state of load-bearing structures, using two calculated complexes SCAD and Robot, has been done. The results of the comparative analysis of structural diagrams of domes on the metal have been given. The complexity of assembling dome structures has been determined. The results of the cost of construction taking into account steel intensity and complexity of the dome structures have been given. Having the results of these studies it has been determined a rational constructive form of a dome with a diameter of 15 m according to the criteria of the cost of the metal and complexity of manufacturing and installation. The dependences of the complexity of the installation of the dome for different solutions of bearing structures of the dome have been found out.
Keywords: structural decisions, dome, design, stress and strain state, comparative calculation, rational form, metal consumption, calculated complexes.
Yaroslav Nazim
Geometrical Modeling of Icing Process on the Conductors of Overhead Power Transmission Lines
Donbas National Academy of Civil Engineering and Architecture
Abstract. Questions, touching geometrical modeling of simulation of icing process on the conductors for overhead power transmission lines, are considered in the article. The goal – definition and predictive modeling of ice load on OPTL constructions. The task of this research is to obtain the analytical description and the construction of a theoretical model of the surface icing of the conductor OPTL. Under the theoretical model is meant approximate, analytical determination of the surface, corresponding to the initial materials for modeling. For achieving this goal, it was done mathematical modeling, which is based on experimental studies on physical modeling of ice on conductors in the laboratory. As a principled approach it is suggested to transfer from physical parameters to geometrical for solving tasks.
Keywords: overhead power transmission lines (OPTL), icing, conductor, geometrical modeling.
Aleхandra Krysko, Yevgeniy Konopatskiy, Andrey Myronov, Volodymyr Mushchanov
Technique of Numerical Analysis of the Intense Deformed State of Steel Vertical Cylindrical Tanks with Taking into Account the Defects of Geometrical Form
Donbas National Academy of Civil Engineering and Architecture
Abstract. The work shows a generic geometric and computer simulation algorithm of the actual surface of the tank wall taking into account both General and local geometry imperfections. Proposed integrated approach to the numerical study of the intense deformed state and evaluation of technical condition of vertical cylindrical steel storage tanks for petroleum products, taking into account the imperfections of geometric forms, ranging from measuring deviations from vertical forming at checkpoints and to the analysis of the stress-strain State of the tank. Researched the intense deformed state of nine tanks of various sizes for storage with local imperfections spherical shape under the influence of hydrostatic load linear setting, allowing to compare the results of numerical research with experimental and theoretical data obtained by other researchers and confirmed the authenticity of the received results.
Keywords: steel vertical cylindrical tank, the intense deformed state, the defects of geometrical form, numerical analysis, hydrostatic load, BN-calculation, computational algorithm.