Volodymyr Mushchanov, Irina Rudneva, Yurii Priadko
Intense-deformed condition of suspended system of bending-rigid fibers at the account of pliability of supports
Donbas National Academy of Civil Engineering and Architecture
Abstract.The results of numeral researches of sensitiveness of structure of suspension roof to horizontal displacements of supports and sinking, that will be uzed in the study of joint work of the bearing spatial cored shell and non-load-bearing plastic construction, which have, properly, different strength and strain qualities are presented in the article. On the basis of numeral researches of the stress and strained state of flexurally-hard filaments in as a part of suspension roof and a separate block of suspended girders, being a model block of the roof, the primary system of correction coefficients which at determination of calculation values of the stress and strained state will allow to take into account maximally possible deviations of the cored elements of radial girders from straightforwardness, conditioned by the production technology, by the terms of delivery, and also pliability of construction supports.
Keywords: sinking, horizontal displacement of supports, efforts, a spatial-rod suspended shell, hard thread of open section.
Sergey Mitrofanov
Work sites elements of structural design
National Academy of Environmental Protection and Resort Development
Abstract. The article is devoted to results of studies of the structural elements of the nodal connection plates. A new form of structural components for the structural systems of the square tube that collects the structural system without breaking the surface of the protective coating (zinc) rods. Theoretical and numerical studies of the stress-strain state (SSS) elements developed nodal connections. Numerical investigations were carried out on computer models created by the node connections that are on the geometric and physical mechanical characteristics consistent with full-scale models. As the external load on the node connecting elements made efforts, derived from the calculation of the structural slab. Calculation is made for the two options: compression or stretching of belts. The graphs and mosaic distribution of stresses in the elements of a node connection. Based on the mosaics stress most likely grounded circuit failure node connections. The destruction of joints for structural system with possibly as a result of loss of local stability of the wall of the tubular elements under the bolt fastener or shear walls in the direction of the load. Experimental studies that confirm a close match (difference amounted to 10…25 %) VAT element nodal connection with the calculation results of computer models. Experimentally validated circuit failure nodes. Conclusions based on research findings.
Keywords: structure, site structure, core elements of a finite element method.
Anatoly Perelmuter
The constructive form number one
SCAD Soft Co
Abstract.The creation and perfection history I-beam profile, as constructive form of a steel de-sign for building is described. Sources of the basic constructive ideas are traced, including and adjacent areas of technique, since the beginning of the XIX th century and up to now. Some facts about the authors of these ideas are given. Practice engineers, which were developing the structural solutions did not use the scientists works. Engineers played their hunches and experiments and metallurgist were developing their possibilities under the influence of other facts. The history of start-up and development of this structural form number one does not have clear origin and possibilities of its development does not confer a right on speaking about the end of its exciting history.
Keywords: i-bean, rail, metallurgy development, welding.
Vadim Gubanov, Irina Meginskaya
Perfection of the mast guys initial tensions design procedure
Donbas National Academy of Civil Engineering and Architecture
LTD «Prombudremont Firm»
Abstract. In the article the questions of calculation of the initial tensions of cellular communication mast guys are examined. The analysis of requirements and the recommendations containing in the modern technical literature and the technical literature of last years about constructions of communication are made. Comparison of the regulations of domestic and foreign standards by calculation of high constructions concerning directions of a wind and combinations of loadings which are necessary for considering at calculation of masts is executed. Perfection results of a design procedure of initial tension of masts guys are stated. The method is based on the decision of the equation of the equation of an elastic line, and also the equation of a flexible thread and the statics equations. The simplified formulas allow to carry out calculation with smaller work expenditures and widely to use a method in engineering calculations for cellular communication guyed masts. The design procedure is illustrated on an example of calculation of initial tension of a trihedral guyed mast with three levels of the guys, located on a building roof, at various directions of a wind and combinations of loadings.
Keywords: guyed mast, guys initial tension, direction of a wind, combination of loadings.
Yevgen Gorokhov, Volodymyr Vasylev, Sergey Kuznetsov, Eduard Lozinsky
Tightening up the existing built-up area by a tall building with regard for wind brace on ventilation systems of low buildings
Donbas National Academy of Civil Engineering and Architecture,
Abstract.The article presents theoretical generalized and new decisions of an urgent scientific and technical problem concerning the wind effects when streamlining a tall building on ventilation system of surrounding low built-up area with regard of leeward waves development in wind flow. The author investigates physical dimensions of aerodynamic characteristics of the wind flow in boundary layer wind tunnel, using six-component tube of Central Aerodynamic Institute. There was developed the technique of scaled modelling. We defined the dependence between the wind pressure coefficient and the influence of Reynolds number and turbulence intensity on it. The calculation system SCADA with high productivity was developed. This allowed fulfill scaled experimental research of model buildings in boundary layer wind tunnel of Donbas National Academy of Civil Engineering and Architecture. The aim of the research was to investigate wind pressure field and visualize the flow in the area of wind brace. In the result there was developed the technique of defining the limits of wind brace area.
Keywords: wind brace, tall building, boundary layer wind tunnel, wind pressure coefficient, wind flow, residential built-up area.
Volodymyr Mushchanov, Denis Romensky
Researches of the stress-strain state unit of connection of walls with the bottom in vertical cylindrical tanks in volume 10 000-50 000 m3
Donbas National Academy of Civil Engineering and Architecture
Abstract. The question of justification of the finite element calculation scheme the node pair with the bottom wall of the vertical cylindrical tank of large volume (10 000…50 000 m3). Main factors influencing the stress-strain state of such sites (geometric and stiffness parameters, design solutions, the strength characteristics of the material, interaction with the ground, uneven cake, etc.). On the basis of numerical studies are summarized obtained regularities of changes in key parameters of the stress-strain state (radial and circumferential strain, radial displacement) of the above-mentioned factors of influence. Proposed analytical expressions to describe the set of patterns that can be used in the design and the refinement of the stress-strain state of the walls of the reservoir is operated in the area unit of connection of walls with the bottom.
Keywords: tank with one wall, connection of walls with the bottom, stress-strain state, the local effect, numerical analyses.
Yevgen Gorokhov, Yaroslav Nazim, Volodymyr Vasylev, Volodymyr Lyah
Testing of icing process on the compacted and sectored conductors of overhead lines in climatic chamber
Donbas National Academy of Civil Engineering and Architecture
Scientific and Technical Center Power National Power Company «UKRENERGO»
Abstract. Questions, touching experimental researches of simulation of icing process on the new types of compacted and sectored conductors for overhead lines, are considered in the article. For achievement of purpose of researches developed and constructed experimental setting on the base of climatic chamber of laboratory of tests of build constructions and buildings of the DonNACEA. The method of comparative tests of conductors with simulation of icing in a wind stream. The study of patterns and characteristics of the ice loads on conductors of overhead power lines will develop the scientific and methodological framework for the protection of power structures under the ice and ensure the sustainable of structures under natural hazards and catastrophic events. Job performances are needed for further researches, related to the study of the icing on the conductor, and also development of measures with the purpose of providing of accident-free work of OPTL at ice and wind loads.
Keywords: overhead power transmission lines (OPTL), icing, conductor, experimental investigations.