V.F. Muschanov, A.I. Demidov
Plasto-elastic stressed state circular conical shell structure of a tapered and constant thickness with a hole
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article is devoted to the use of the before developed methods on determining plasto-elastic stressed-deformed state of arbitrary shells on the base of the theory of small plasto-elastic deformations. Linearization of problem solution is performed by the method of elastic solutions with the use of Lagrange’s variational equations. When writing it down, the relationship between stresses and deformations is given in the form of Hook’s law but with complementary members for plastic deformation. Kinematic boundary conditions are accurately met, while static ones on shell free edges are satisfied approximately. There is considered a design of two open conic shells of a tapered thickness in a peripheral direction and one shell of a constant thickness of an even area of section, the equations of their middle surface being written down in the parametric form. The problem is solved by the method of elastic solutions in combination with the variational-differential method in the displacement of points of the shell middle surface. The problem is solved till the numerical results. There are given the fields of shearing stress intensity by the internal, external light and middle surface for these three types of shells at a plasto-elastic solution.
Keywords: open conic shell with a hole, variational-differential method, method of elastic solutions, shear deformation intensity, shearing stress intensity, plasticity function.
E.M. Ermak, V.V. Kulyabko, А.V. Maslovskyi, А.О. Ismagilov
Dynamics of constructions and the equipment of workshops with the general wall and with a various level of admissible vibration
Ukrainian State Academy of Railway Transport Pridneprovsk State Academy of Civil Engineering and Architecture
Abstract. The problems of close had heterogeneous manufactures linked with mutual effect on building constructions and the precision equipment (“receivers” of vibration) dynamic (vi-bration and shock) impacts at operation of bridge cranes, falling tups, cubers of steel swaft, at loading operations, etc. (“sources”) are discussed. The instance of a three-drift one-storied industrial building in which contiguous spans manu-factures absolutely different on a level of admissible vibration of the departments disjointed by the general brick wall are placed is considered. In one of departments the coarse mechani-cal operations are made, the crane working in it requires in repair, is frequent on a floor of department and in railway vehicles the big mass of metals is dumped. In other to department it is had cost intensive furnace, the precision balance, numerous cabinets with devices. Theoretical and natural experimental researches have been lead, recommendations on lower-ing vibration and dynamic certificates are given.
Keywords: dynamic, vibration, industrial buildings.
I.M. Garanzha, V.N. Vasylev
Efficiency of using many-sided bent frames for overhead power line towers (OPL) in Ukraine today
Donbas National Academy of Civil Engineering and Architecture
Abstract. The paper deals with the aspects of the world experience of using structures on the base of many-sided bent frames (MSBF), a worldwide use of these structures being noted. In addition there is given a technical and economic comparison of the OPL intermediate lattice towers of 110 kV on the base of a many-sided bent frame of almost even geometrical sizes made of steel C245, a special attention being paid on a considerable economic benefit of using the MSBF-sided towers in comparison with the use of lattice towers. There are also given important positive features of the MSBF-sided structures, the design results as well as the scheme of the nearest laboratory and field experiments in the sphere of the MSBF-sided structures are also described. In conclusion there are depicted design, assembly and operation faults of MSBF and possible measures of their elimination are given.
Keywords: many-sided bent frames (MSBF), overhead power line (OPL) towers, sphere of application, technical and economical comparison, efficiency of application, structure weight, cost «in operation», specific cost, design procedure, experimental researches.
V.V. Gubanov, V.I. Moskalenko
Elimination of consequences of an industrial building failure. A case study
Donbas National Academy of Civil Engineering and Architecture “Prombudremont” Corporation
Abstract. A case study of elimination of failure consequences in the open-hearth shop of a metallurgical plant is considered in the paper. There is given an analysis of causes of a pouring bay failure and an observation of the structures remained. It was found out that the failure was caused by column inadmissible wear at the level of crane girders and by a freeze-up influence in the equipment installed on the coverage. The inspection showed a high reliability of the building structure which made it possible to localize damages within the end span of the temperature section of 50 m long. Observation of the building state allowed to map out the main stages of the failure elimination including the program of fulfilling the works; a teardown of the damaged floor system, crane girders, columns; repair of the trusses and columns remained; manufacture and assembly of the floor system. When performing the works, the basic task was to combine construction works with the continuous processing procedure in the shop. So a graph of fulfilling the works had to be scheduled, a corresponding dislocation of hoisting cranes was provided, and safety labor conditions were ensured. On the base of the investigations carried out and the building and construction works fulfilled there were given recommendations on providing a trouble-free operation of the metallurgical complex buildings.
Keywords: industrial building, damages, failure, organization of construction, metallurgical industry.
Y.V. Nazim, A.A. Leshchenko
Modernization of a weather post device to measure ice loading
The Donbas National Academy of Civil Engineering and Architecture
Abstract. In 2004 the Ukrainian scientists developed a system of monitoring ice and wind loads on overhead power lines the basic element of which was an automated ice and wind weather post. Weather post operation in field conditions at the substations of the National Electric Company “Ukrenergo” revealed a number of problems of their work. There are considered and briefly characterized some foreign automated systems of monitoring. There are analyzed the reasons of an imperfect operation of the domestic system of monitoring, and there are described the ways of improving the most complex and critical element of an ice and wind weather post – a device to measure ice loading. There is also described the structure and principles of operation of the improved ice and wind weather post which is now being introduced into operation.
Keywords: overhead power lines, ice and wind loads, an automated system of monitoring, a measuring device, a wire simulator, wind direction.
A.M. Alyokhin
Numerical researches of antenna tower conduct under ice and wind attacks
The Donbas National Academy of Civil Engineering and Architecture
Abstract. The paper is devoted to the results of the numerical researches on an antenna tower of the joint-stock company 60 under wind and ice attacks. There was carried out a static design of the tower by the procedure of designing antenna towers. Wind and ice-wind loads were collected by the State Building Norm (SBN) [4]. The design was fulfilled in the program complex “SCAD Office 11” by the MFE and modal analysis (dynamic design) methods for the 3rd wind and 4th ice regions to determine tower dimensional instability and resonance and to compare them with the normative values.
Keywords: static and dynamic designs, antenna tower, wind load, ice load, loading scheme, movement, frequency, resonance, vibrations, dimensional instability, ice and wind attacks.