Magazine of Civil Engineering, No.1(77), 2018


S.V. Solskiy, N.L. Orlova, A.S. Velichko
Crack self-healing in clay-ņement concrete diaphragm of embankment dam

The article presents the results of the analysis of seepage flow character in an embankment dams with impervious diaphragm made of clay-cement concrete, using the Gotsatlinskaya HPP as an example. The process of slits colmatage was considered in the clay-cement-concrete diaphragm (CCCD), that be caused in the zone of tensile forces or by seismic actions.
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B.I. Giyasov, V.I. Ledenyov, I.V. Matveeva
Method for noise calculation under specular and diffuse reflection of sound

The paper offers a combined method for calculation of energy characteristics of such fields; specular reflected energy is calculated by ray tracing, and diffusely scattered one is calculated by a numerical energy method. The paper describes the basic principles for making the combined design model and offers scattering factors of reflexible sound energy that are necessary for the implementation of design model and were obtained from experiments and calculations. The accuracy of the combined method was assessed by a comparative analysis, and experimental and calculation data in production facilities of various proportions.
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Yu.Ya. Tyukalov
Finite element models in stresses for plane elasticity problems

The solution of the plane problems of elasticity theory on the basis of stress approximation is considered. To construct the solution, the additional energy functional is used. With the help of the principle of possible displacements, algebraic equations of equilibrium of the nodes of the grid of finite elements are constructed. Equilibrium equations are included in the functional of additional energy by means of Lagrange multipliers.
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M.V. Gravit, O.V. Nedryshkin, O.T. Ogidan
Transformable fire barriers in buildings and structures

The paper presents the results of tests for fire resistance of samples of fire curtains. The ability of intumescent formulations to effectively prevent the spread of heat has been studied. The article presents the results of testing various compositions of Intumescent fire retardant coating (IFRC) with the addition of latex for fire curtains based on silica fiber.
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M.R. Petrichenko, D.V. Nemova, E.V. Kotov, D.S. Tarasova, V.V. Sergeev
Ventilated facade integrated with the HVAC system for cold climate

The purpose of this article is development of the theory of heat and mass transfer in capillary-porous media, air flows and building structures. The engineering purpose is ā concept development of a closed ventilating circuit with convective heat flow to reduce the pressure on the environment, improve the comfort of the building and reduce operating costs.
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V.N. Kabanov
Organizational and technological reliability of the construction process

Construction projects of buildings and structures, as well as plans of construction and installation works are often subjected to fair criticism from the Pro-producers of the work. Such criticism is that the calculated cost value and long lasting-STI CMP does not take into account the specificity of real contractors.
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O.A. Tusnina,
Finite element analysis of crane secondary truss

Finite element analysis of the crane secondary truss of top-blown oxygen vessel plant with the span of 36m is considered in the paper. Analysis of crane secondary truss is quiet difficult because of necessity of taking into account actual stiffness of its joints and also because of the fact that lower belt of truss made of thin-walled closed profile is experiencing restrained torsion because of eccentrically crane load acting.
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V.I. Travush, D.V. Konin, A.S. Krylov
Strength of reinforced concrete beams of high-performance concrete and fiber reinforced concrete

The strength of reinforced concrete beams made of high-performance concrete and fiber reinforced concrete was evaluated in a pure-bending test. The efficiency of using straight steel fiber in bending structures was evaluated. The fracture pattern of models was described.
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M.M. Mirsaidov, T.Z. Sultanov, R.A. Abdikarimov,
Strength parameters of earth dams under various dynamic effects

The paper provides the methods for evaluating the strength parameters of earth dams under forced oscillations. The methods of solving the problem are based on the expansion of sought for solution in terms of eigenmodes of elastic structure oscillations.
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P.S. Barashkova, L.M. Molodkina
Track-etched membranes back-flushing and regeneration during the natural water purification

Comparative study of the back-flushing and chemical regeneration after natural water filtration using standard 12-μm-thick track-etched membrane and new 20-μm-thick irradiated on both sides (with argon ions with the mileage less than the film thickness) was performed.
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L.V. Zakrevskaya, A.A. Gavrilenko, S.N. Avdeev, I.A. Gandelsman, A.V. Kireev
Lightweight concrete based on siliceous compositions of natural origin

The focus in the release of construction materials is determined by waste recycling, saving energy costs and environmental management by means of reducing dump areas. The production of magnesia binders from dolomite waste meets all these requirements.
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M.R. Petrichenko, E.V. Kotov, D.V. Nemova, D.S. Tarasova, V.V. Sergeev
Numerical simulation of ventilated facades under extreme climate conditions

The aim of the work is to determine the velocity of air flow in the gap of a ventilated facade with different width of the gap, the height of the building and climatic conditions by the method CFD (Computational Fluid Dynamics) - simulation of convective heat flux.
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V.V. Terleev, A.O. Nikonorov, R.S. Ginevsky, V.A. Lazarev, I. Togo, A.G. Topaj, K.G. Moiseev, V.A. Pavlova, K.A. Layshev, M.V. Arkhipov, A.Yu. Melnichuk, I.A. Dunaieva, W. Mirschel
Energy performance of domestic hot water systems

Designing of underground constructions, such as irrigation and drainage systems, requires engineering surveys. Such surveys include the study of the hydrological conditions of the territory, which are determined by the hydrophysical properties of soils, such as their water-retention capacity.
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