Roman Кіnash, Yaroslav Huk
Application of factor geographically heights for determining snow loads in the mountainous district transcarpathian region
National University «Lviv Polytechnic» & University of Science and Technology, Poland
Abstract.Coefficient geographical altitude, Calt, used to calculate the limit, operational and quasi permanent snow load on structures. The article presents an analysis and comparison of this ratio calculated by formulas DBN B.1.2-2:2006 and long-term observations for snow load on 9 meteorological stations Transcarpathian region. If statistical data for the last 50 years the maximum snow load on meteorological and transitional stations, data for which additional calculations in areas and altitude-logarithmic factors in the calculation of all values of snow load factors Calt geographic height should be equal to 1. Since the height above the Baltic Sea 1 450 m and above, the rate of geographical altitude Calt has value close to 4.6.
Keywords: snow load, factor of geographical heights, building construction, Transcarpathian region, weather station, mountain region.
Sergey Pichugin, Yuliya Patenko
Reliability estimation of steel frameworks of industrial buildings equipped with overhead travelling cranes
Poltava National Technical University named by Yuriy Kondratuk
Abstract. The article is devoted to the reliability assessment of steel frameworks of one-storey industrial buildings with overhead travelling cranes. The increased values of crane loads and spatial behavior of steel frameworks were accounted in the probabilistic computations. The design models of frameworks that appropriate actual behavior of frameworks were detected for design calculation of steel frameworks on design computer systems. The practical evaluations of reliability parameters of steel frameworks of one-storey industrial buildings were obtained accounting the time factor and actual external loads. The contribution of bracing elements to the spatial behavior assurance was determined, especially of the braking structures and sheathing bracing elements.
Keywords:steel frameworks, one-storey industrial buildings, spatial behavior, crane loads, structural eliability.
Volodymyr Vasylev, Yevgeny Shevchenko, Aleksey Karabanov, Anton Tanasoglo
The valid load-carrying capacity of one-bolted joints taking into account technological features of formation of an aperture
Donbas National Academy of Civil Engineering and Architecture
Abstract.Power Transmission Lines (PTL) represent a spatially-rod design which consist of rolling L-steels connected in knots bolts working on bearing and cut. In supports PTL elements with insignificant thickness – from 4 to 12 mm are mainly used. In such designs theoretically bolted joint refusal occurs in a consequence bearing connected elements. On practice refusal of one-bolted joints occurs because of a cut of a bolt or element destruction on the weakened sectional view. The analysis of calculation of bolted joints under the standard documents operating in Ukraine and abroad that they different from each other. In all considered size standards the technique of formation of apertures accurately does not make a reservation. The spent experimental researches have shown that the bolted joints formed by a method of a punching, perceive loadings exceeding settlement. Such misfitting of work of a bolted joint is caused by two factors – in definition of efforts смятия, there is a stock on durability; the punching of apertures leads to increase in a mechanical material properties.
Keywords: settlement resistance, supports of Power Transmission Lines, stability, a bearing stress, an experimental model, a bolted joint, refusal of work of a bolted joint.
Volodymyr Mushchanov, Alexander Demidov
About precision of elastoplastic solution of problem for cyclindrical shell under action of concentrated force
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article is devoted application of the before developed method on determination of the resiliently-plastic tensely-deformed state of shells of arbitrary form on the basis of theory of small resiliently-plastic deformations. Linearizing of decision of tasks is executed the method of resilient decisions. In every approaching variation equalization of Lagranzha is used in moving of points of middle surface of shell in eventual differences. At the record of variation equalization of Lagranzha connection between tensions and deformations is presented in form law of Guka, but with additional members, taking into account plastic deformations. Geometrical equalizations are accepted in the linear raising in form correlations Koshi. Material is characterized the proper diagram of tension of cylindrical standard, module of normal resiliency and coefficient of Poisson. Kinematics scope terms are satisfied exactly, and static – on the free of fixing edges of shell approximately. A task is examined about precision elastic-plastic decision of the unreserved cylindrical shell of permanent thickness, hardly jammed on an outward contour at operating on it of the concentrated force normal to the middle surface. Precision of decision of this task is conducted on intensity of tangent tensions depending on density of net area, and also from the amount of points after the thickness of shell, additional elements depending on plastic deformations on the formula of Simpsona accepted at a calculation. Work is devoted the present day question of structural mechanics of shells at the action of the concentrated forces at resiliently-plastic deformation at the active process of loading.
Keywords: cylindrical shell, variation and difference method, method of linear approximation, density of tangential stress, function of plasticity. Precision of elastoplastic solution of problem for cylindrical shell.
Vladimir Sintsov, Vladimir Mitrofanov, Alexander Sintsov, Sergey Mitrofanov
Stressed-deform state of the transport frame for transporting ice-resistant steel deck platform to the caspian sea
National Academy of Environmental Protection and Resort Development
Abstract.The article deals with offshore fields. According to the results of examination of state field name V.Filanovskogo the largest reserves of oil field discovered in Russia in the past 10 years. In 2013, plans to launch the first place with four hydraulic works, start drilling and put into operation. One of the waterworks is ice-resistant steel platform (LSP). This building is two steel bearing blocks connected together multitiered steel deck. Manufacturing will be on the deck of a special steel structure – transport and mounting frame, which will transport the multilayered steel deck at the point of settlement at the barge. The paper presents the research findings of the stressstrain state (SSS) of the elements of the transport frame under tiered steel deck steel ice-resistant platform (LSP). Transport frame is a system of cross steel beams. Developed a three-dimensional model of the «multi-layered steel deck – transport frame». Investigated the VAT element of the spatial model with loads for the period of manufacture decks, deck construction establishments with tranmportnoy frame on a barge and during transport and the sea at the recommended normalized wave loads. The results of numerical studies of the stress – strain state of the elements of the transport frame.
Keywords:off-shore construction, transport frame, eventual element, method of eventual element, calculation model.
Olexandr Leshchenko, Yaroslav Nazim
Improvement of methods for determining icing load on the conductors of overhead lines
Donbas National Academy of Civil Engineering and Architecture
Abstract.The paper deals with numerical simulation and experimental investigations of icing on the conductors of overhead power transmission lines, interaction of glaze ice with conductor, as well as some aspects of the influence of wind direction on the icing on the conductor. There was a computer program based on the model Makkonen that lets you perform a theoretical simulation of the icing with stiffness in torsion of the conductor. Made up the differential equation of the angle of twist the conductors under the eccentric ice load. To determine the combined effect of wind speed and direction on the parameters icing deposits performed studies using the experimental setting on the base of climatic chamber of laboratory of tests of build constructions and buildings of the DonNACEA. Found that the ice load leads to an intense single twisting power lines, wind direction affects the shape and structure of glaze ice.
Keywords:overhead transmission lines (OHL), conductor, icing, stiffness in torsion, the numerical simulation, experimental investigations.