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  • Point of reference

    When performing installation of technological equipment in the shop one of the main instrumentation task is to control the installation of component parts of equipment on a given elevation in a horizontal position. The solution to this problem, usually implemented by geometric precision leveling. The authors of this article, the improvement of means of fastening geodetic altitude framework developed technical solution universal removable working point of reference.

    Keywords: technical control, installation of technological equipment, point of reference, geometric parameters, contour build

  • Analysis of solutions of the problem of control radialnet and profile of the longitudinal section

    The problem of measuring the geometrical parameters of objects with curvilinear forms, is that for some material object it is necessary to determine the compliance of its controlled surfaces specified a priori (or a posteriori) geometric form. A common solution to this problem lies in the fact that in some coordinate system is set to reference the shape of a curved shape (circle, ellipse, parabola, hyperbola and other curves), it is necessary to determine whether the current point of the controlled object to a given curve.

    Keywords: technical control, controlled surface, geometrical parameters, the profile of the longitudinal section, a laser system

  • Model for the study of reinforced concrete slabs punching columns when heated

    A comparative analysis of the results of numerical studies of the shear strength of the two most common models fragment joint compound reinforced concrete floor slab with a column of monolithic buildings with punching and heating. Simulation of stress-strain state of concrete samples conducted in LIRA 9.6 R9 with various combinations of loads and effects in the nonlinear formulation to study the processes of their destruction. Revealed new features of the stress-strain state of reinforced concrete monolithic buildings with bezrigelnym frame with an alternative design scheme that reflects the true picture of loading plate and corresponds to the method of Eurocode 2.

    Keywords: connection node reinforced concrete slabs with a column, monolithic building with bezrigelnym frame, strength plates with cut and bursting under heat, non-linear analysis

  • About the bearing capacity of reinforced concrete strengthened by CFRP short columns tested for large eccentricity.

    The data on the bearing capacity of short reinforced concrete columns with the flexibility λh = 10 strengthened by CFRP, the action of axial load, eccentricity e0 = 4cm. Effectiveness of various options for strengthening was determined, provided the action force outside core-section.

    Keywords: concrete, reinforced concrete, steel, rebar, composite, carbon fiber, strength, load-bearing capacity.

  • Load bearing capacity and deformability of strengthened short columns for small eccentricity.

    Presented and analyzed data on the results of tests of short reinforced concrete columns with the flexibility λh = 10 strengthened by CFRP for external applying force with an eccentricity e0 = 2 cm. The effect of strengthening on the bearing capacity and deformability of columns when a load is applied to the inside of the core-section.

    Keywords: concrete, reinforced concrete, reinforcement, CFRP, load, strength, deformability.

  • Judicial construction examination in the Russian Federation

    The structure of judicial construction examination is presented to the Russian Federation, an example of carrying out judicial construction examination is in details reviewed, the subsequent actions after an assessment of the caused damage are shown

    Keywords: Judicial construction examination, assessment of technical condition of the building, damage assessment недвижимости

  • The crack resistance of concrete structures as a function of the marginal elasticity of concrete

    The article considers the problem of determining the moment of cracking in flexible reinforced concrete structures. It is shown that the stress at which cracks, significantly depend on the modulus of elasticity of concrete under tension, equal to the ratio of the elastic part of the deformation to the limit of elasticity of concrete.

    Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

  • Automation of monitoring of technical condition of bridges on meliorative channels of the Rostov region

    Problems of service and repair of bridge constructions of a network of the irrigation canals which are on balance of managements of melioration are considered. The description and functionality of the automated imnformatsionny system developed by authors, allowing to carry out the account and monitoring of technical condition of bridge constructions in the territory of the Rostov region is provided.

    Keywords: The meliorative channel, bridge construction, durability and operational reliability of bridge moving via water carrying out channels, monitoring of a condition of the bridge moving, the automated information system

  • Visualization of breakings of geodetic domes under blast loads

    In design and manufacture recently interest to a solving of problems of fluid-structure interaction  is constantly incremented. MSC.Dytran has opportunities of calculation of fluid-structure interaction. MSC.Dytran has found application in different fields for example in general safety analysis.In this article algorithms of fluid structure interaction , used in MSC.Dytran, are described. Analysis of one-contour geodetic domes under blast loads are described.

    Keywords: visualization, computational model, geodetic dome, numerical modelling, blast load, pressure, stress.

  • The analysis of work of building elements hermetic shell nuclear power plant during preliminary tension and testing

    Design of the protective hermetic shell of the reactor compartment of the nuclear power plant discusses in the article. The possible deformation of elements of the hermetic shell during preliminary tension  and testing is considered

    Keywords: protective hermetic shell; change of form; deformation; strength tests

  • Mathematical model and optimization of parameters of work of a lamellar recuperator

    Use nonconventional and renewables has important economic value for energy saving. Lamellar recuperators are applied to a reuse of heat of departing air in system of ventilation of buildings. Its functional mathematical model is developed for increase of energy efficiency and optimization of parameters of work of a lamellar recuperator. On the basis of mathematical model the criterion of optimization is defined and optimum modes of functioning of a recuperator of ventilating air are established. As a result of researches it is established that the heating of external air is necessary for increase of overall performance of a recuperator before an entrance to a recuperator. For the solution of this task it is offered to use soil the heat exchanger.

    Keywords: mathematical model, lamellar recuperator, nonconventional power sources, optimization, energy saving

  • Comparative analysis of theoretical and experimental research full-scale arches from glued wood

    The results of testing full-scale triangular arch span 12 m Arch loaded jacks lifting capacity of 20 tons per quarter of the span concentrated forces transmitted through the steel belts to traverse the arch. Arch deformation sensors fixed resistance, dial indicators and deflectometer. According to test results graphs plotted strains, as well as diagrams of normal and tangential stresses.

    Keywords: arch from glued wood, metal triangular wooden arch, full-scale experiments compressed curved elements, brittle fracture.

  • System of oscillations indemnification of a high-rise construction in a seismoactive zone

    Systems of passive damping of oscillations of high-rise constructions are considered. Their merits and demerits are revealed.  The roller  system of  oscillations indemnification  of the high-rise constructions subject to seismic influence is offered.  The principle of its work is described.  Advantages are estimated.

    Keywords: high-rise construction, damping of oscillations, passive systems, roller system of indemnification, vibroisolation

  • Stressed state peculiarities of ballastless track system slab substructure soils

    The article depicts test results of ballastless track system roadbed stressed state. In-situ tests of roadbed vertical stresses were held considering rolling stock type and speed. Roadbed vertical stress distribution dependence was carried out.

    Keywords: Roadbed, ballastless track system, RHEDA 2000, vertical stress damping, stress distribution

  • Local logistic centers in urban environment

    The article presents the local type of logistic centers in urban environment as an essential part of freight network and its place in hierarchic logistic system of a country. Transport, compositional, ecologic and other aspects that have impact on spacial concept of local logistic centers are under examination. Thus generalized models of local logistic centers are put forward. They are developed by the authors with large volume of handled cargo, turnover capacity, and are space-saving. The main concepts of such models are following:  vertical development of storage volume due to construction of several floor and shelf storage levels with different ramps as well as provision of comfort one-way transport of minimum maneuvers and without crossing and conflicting traffic.

    Keywords: architectural spatial concepts, logistic centers, warehousing types , generalized spacial model

  • Problem of determining the residual resource of technical condition of low pressure closed spillways waterworks

    Currently, more than 80% of water conveyance structures worked much the normative life. At the same time there is a simultaneous increase in the load on the aging waterworks, in the absence of the necessary skilled personnel and technical repair base will inevitably lead to an increase in the number of accidents due to operational reasons. Identification of factors that influence the condition of the facilities at the intersections , the search for methods of calculation and control of non-destructive methods to evaluate their work , life extension , etc. is of paramount importance at this stage. Residual life for the safe operation of water conveyance structures determined on the basis of system analysis with the development of the block diagram of a dynamic system having a number of subsystems. The main property that determines the life of the system , is the reliability of its elements , ie reliability and trouble-free operation for a certain period of operation. Dependability and reliability of the system as a whole is determined by the condition that each element of the system can be in one of two states - serviceable or failure.

    Keywords: water-conducting structures, low head hydro closed spillways, modeling, technical condition, residual life.

  • Experimental study of strength and thermal properties of materials for thermal calculations enclosing structures based on them

    The main maintenance of a determination of strength and thermal properties of lightweight concrete on the basis of local raw materials by the Republic of Tajikistan constant linear heat source. The dependence of the thermal conductivity of wet concrete on its temperature as a linear function , differentiated by zones of positive and negative temperatures, which is the basis for calculating the probability of heat engineering structures using the test light concrete .

    Keywords: Lightweight concrete, thermal conductivity, specific heat, humidity, temperature, probability figures, exterior walls, thermal calculation

  • Methods for modeling the stress-strain state of the reinforced concrete spillway console for various boundary conditions

    The paper discusses methods for the numerical simulation of the stress- strain state needed to evaluate the different boundary conditions of technical condition of long exploited surround impervious geotextile cover height adjustable fins . After a long period of operation of hydraulic structures continue to operate without routine repairs necessary to make the technical reconstruction of structures on the basis of innovation , as well as the previously proven technology of repair. The simulation result is characterized by the presence of non-hazardous for coverage of total movements , which shows the presence of a large margin of safety cover . It was also made ​​modeling the formation of various defects, namely the most dangerous - subsidence of the underlying soil. Education deflection along the length of coverage shown in the orthographic total displacement of the drawdown of the subsoil . Was numerically simulated work covering the load of its own weight and volumetric filling the cells of soil under different parameters . One of the pressing problems at present in the field of security for a long time operated water conveyance structures is the correct assessment of the residual life .

    Keywords: waterworks, water-conducting structures, numerical simulation, the stress-strain state

  • Methods for modeling the stress-strain state to determine residual life of reinforced concrete console spillway under various boundary conditions

    This article discusses methods of modeling the stress- strain state needed to evaluate the different boundary conditions of the technical state of reinforced concrete cantilever operated long spillway. Most long- operated hydraulic structures in Russia is unsatisfactory condition requiring modernization and refurbishment. After a long period of operation waterworks continue to work without a planned repairs necessary to make the technical reconstruction of buildings on the basis of innovation , as well as previously proven technology of repair. Console spillway - open conjugating hydraulic structure where the water first moves over the construction , and then - the water flow freely reset to unfortified ground. Such structures the most economical , since the same difference befov their reinforced concrete part of a much smaller, and no part of the stilling strengthened and basically they are arranged on the rocky soil . When soils are weak, then you must make the console damper on long distance or strengthen easily eroded soil in the fall of the water flow. In the most dangerous cases falling from the absorber fed to a stilling well, for energy dissipation , from which he subsequently moved away from the building. Assessed the degree of accident risk of reinforced concrete elements console spillway . In the experiment sought to identify the residual resource , namely the reliability of the technical state of facilities for the period of operation, more than 60 years , in different types of defects and damages , as well as the estimated residual life . A complex system using a database Microsoft Access.

    Keywords: waterworks, console spillway, the stress-strain state, numerical modeling, technical condition, residual life.

  • SYSTEM ENGINEERING OF OPTIMAL DESIGN OF ELEMENTS OF STRUCTURAL UNITS

    Possibilities of using mathematical programming methods for obtaining optimal solutions of structural units were shown herein. Method of personal optimization based on monotonicity property of the used relations was applied as optimization algorithm. Advisability of using mathematical simulation methods when providing complex safety of construction facilities and reduction of breakdown occurrence is emphasized.

    Keywords: optimal design, mathematical simulation, complex safety, personal optimization, plate structures, risk.

  • Тhermointense condition of designs taking into account the jamming in the basis and the pliability of end faces

    The main maintenance of a  results of calculation of a thermointense condition of beams depending on various ways of an attachment to the basis - jammed in the basis, with absolutely hard sealing-off on end faces and absence of any communications at end faces is considered. The analysis shows, that the more age of "blocks-communications", the more they possess rigidity. It means, that they are less pliable, and sizes of pressure in the settlement block are close to pressure in the block with the jammed end faces.  

    Keywords: Termointense, concrete, block, communication, support, suppleness, pinched, temperature, movement

  • Features of the production work on lifting and leveling in a cramped building

    The article describes the experience of the unique complex of works to improve the operational reliability of the emergency office buildings located in a cramped building, whose main task was to eliminate excessive rolls with hydraulic jacks and ensure the continued trouble-free operation. Highlighted the key features of the design and technology solutions for the simultaneous lifting and leveling of several buildings with different design decisions.

    Keywords: adjustable foundation, electro-hydraulic flat jacks, cramped building, lifting and leveling, operational reliability.

  • Translation of geometric models of two-contour geodesic shells

    In this paper consideration is given to problem of developing a converter which will enable convert models of geodesic domes from external 3D format to preprocessor Patran format and structural analysis of this geodesic domes. A library of Framework and Visual Basic was used for building the converter.  

    Keywords: geodesic dome, structural analysis, geometrical models, grammar, the converter, preprocessor/postprocessor

  • Technological processes and their influence on durability of building designs

    In article results of long-term researches of manufactures of synthetic rubber and studying of technological processes are resulted. Dependence of durability of building designs on parameters of technological processes is established

    Keywords: Technological process, durability of designs, the reasons of corrosion destructions

  • The basic principles of the producing and erection technology of the chimney liners from polymer composite materials by the method of vertical winding with the growing

    The paper is dedicated to development of modified technology of producing and erection of large fiber-reinforced plastic (FRP) shells. This work gowing with the support of Russian Ministry of science and education. Technology is baced on the method of the vertical wet winding with the growing. The main prospective area of using of this technology, is the reconstruction of the tall chimneys with the erection of inner liner from the FRP shells.  

    Keywords: fiber reiforced plastics, glass reinforced plastics, chimneys, metod of the vertical wet winding with the growing