Magazine of Civil Engineering, No.3(79), 2018




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Y.V. Krasnoshchekov, L.V. Krasotina, J.L. Pulido-Delgado
Models of direct anchoring of reinforcement in concrete

When analyzing methods for calculating the anchoring of non-tension reinforcement of reinforced concrete structures, it has been established that there are two types of destruction of concrete in the anchoring zone by shearing or cracking. They are based on the results of research of the strength the adhesion of reinforcement with concrete and testing of specimens with the same type.
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K.P. Mandrovskiy, Y.S. Sadovnikova
Characteristics of the droplet motion of a liquid antifreeze reagent

The object of investigation is the process of spraying of the anti-icing reagent. As an object of research, external forces are selected that affect on each drop of the reagent: counteraction forces, gravity forces, Coriolis force and centrifugal inertial forces, lifting force, frictional forces of the reagent on the surface of the working equipment: disk and blades. It is assumed that the liquid reactant is fed under pressure to the hydraulic nozzles installed in the disk casing, and then falls onto the distribution disk.
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V.A. Orlov, I.S. Dezhina, E.V. Orlov
Micro-turbulence of the stream and its connection with the roughness of the pipeline inner surface

This study has been aimed at investigating the problems of a fluid stream flowing in an open chute, which imitates a small-diameter gravity pipeline (up to 150 mm) at low rates of sewage. The works on a specially developed hydraulic bench have enabled determination of the conditions of the flow vortex formation (micro-turbulence) by changing the geometric shape of the internal surface of the pipe by placing artificial protrusions (obstacles) on it, which can help to prevent deposition of suspended particles on the pipeline surface and facilitate their efficient removal.
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V.I. Travush, D.V. Konin, A.S. Krylov
Strength of composite steel and concrete beams of high-performance concrete

A brief review of the use of high-performance concrete in monolithic structures in Russia in recent years is made; the last experimental work for the study of high-performance concrete in composite steel and concrete structures is observed. Strength assessment of composite steel and concrete beams has been carried out by a pure-bending test.
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A.V. Bushmanova, D.K. Kharchenko, K.S. Semenov, Yu.G. Barabanshchikov,
V.K. Korovina, A.V. Dernakova
Thermal cracking resistance in massive steel-reinforced concrete structures

The work is dedicated to research of the thermal crack resistance in massive steel-reinforced concrete structures in construction period. The article examines the results of the analysis of the thermal stress state, which occurs in massive steel-reinforced concrete column. The steel part of the column is represented by a system of cross UC-beams. The study was conducted with using analytical models, which include the factor of steel profiles availability in comparison with simplified methods.
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Yu.Ya. Tyukalov
Refined finite element of rods for stability calculation

The article deals with the application of a rod finite element with five degrees of freedom in a node to solve problems of stability of planar rod systems. In the presented finite element, additional degrees of freedom are introduced in the nodes in the form of curvature and axial deformation. Additional degrees of freedom provide a higher degree of approximation of displacements and deformations along the length of the finite element, which can be useful for calculation of rods with variable rigidity, as well as for solving geometrically nonlinear problems and stability problems.
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R.S. Fediuk, V.S. Lesovik, A.P. Svintsov, A.V. Mochalov, S.V. Kulichkov, N.Y. Stoyushko, N.A. Gladkova, R.A. Timokhin,
Self-compacting concrete using pretreatmented rice husk ash

Self-compacting concrete was obtained by partially replacing Portland cement with a previously prepared rice husk ash Preliminary preparation included the thermal treatment of the ash under various conditions. The optimum technology of preparation, allowing to receive a homogeneous concrete mix is revealed. All concrete mixtures were designed in such a way as to have a slump flow of 680 ± 30 mm in diameter, which was achieved by using different dosages of a superplasticizer based on polycarboxylate ether.
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M.P. Sainov, F.V. Kotov, N.V. Nazarov
Serviceability of rockfill dam with reinforced concrete face and grout curtain

The article deals with design validation of a new structural design of an embankment dam, i.e. rockfill dam with seepage-control element of composite design. It consists of a reinforced concrete face (in the dam upper part) and a wide grout curtain (in the dam lower part). Analyses of the dam stress-strain state (SSS) were conducted on the example of a 235 m high dam. Numerical modeling of the dam was performed with consideration of its construction and loading sequence, as well as non-linear deformation of rockfill.
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M.V. Gravit, E.V. Golub, S.P. Antonov
Fire protective dry plaster composition for structures in hydrocarbon fire

The result of the combustion of fire hazardous materials at the facilities of the oil and gas complex is extensive fires, characterizing the rapid temperature rise, and as a result the destruction of load-bearing structures occurs. The dynamics of the development of such fire type requires a different approach to test the structures in order to determine the limit of fire resistance.
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K.S. Ivanov
Granulated foam-glass ceramics for ground protection against freezing

The problem of seasonal freezing and frost heaving of soils of the engineering structures foundations is considered. For the purpose of thermal protection of soils, a granular inorganic closed-porous material, named granulated foam-glass ceramic is proposed. In the laboratory modeling of seasonal freezing, the dynamics of temperature and deformation, as well as the distribution of moisture over the depth of the soil, were studied in three cases: a soil without thermal insulation, a soil with a layer of granulated foam glass ceramics and a soil with an extruded polystyrene layer.
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G.B. Vieira, M.R. Petrichenko, T.A. Musorina, D.D. Zaborova
Behavior of a hollowed-wood ventilated façade during temperature changes

The Ventilated Façade System is a reasonably new technique, which was developed in Europe with the need of cost savings from the energy for cooling and heating of constructions. This system, established in the 1960’s, was an acknowledged as a constructive innovation both for esthetics and functional aims. Therefore, its use has spread not just during buildings’ retrofit but also in new constructions.
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R.B. Orlovich, V.V. Bespalov, V.N. Derkach,
Compressed-bent masonry walls reinforced with composite materials

Despite the wide spread of surface composite reinforcement of masonry structures, there is not enough information concerning methods of calculating such reinforced structures in the actual normative literature. The article proposes a numerical model for estimating the effect of composite reinforcement on the bearing capacity of a compressed-bent masonry wall which is constructed on the basis of experimental studies of walls from cellular concrete blocks.
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V.V. Lebedev, I.S. Nudner, N.D. Belyaev, K.K. Semenov, D.I. Schemelinin
The formation of the seabed surface relief near the gravitational object

During the interaction of waves and currents with objects established in the shallow offshore areas, scour of their base may occur. At the same time, it is always necessary to exclude the appearance of significant seabed scour near supporting parts of gravity-type platforms during the process of their design. The article presents the results of experimental studies of processes occurring under the impact of flows of various types on gravity-type structures and their foundations.
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A.S. Rassokhin, A.N. Ponomarev, O.L. Figovsky
Ultra-light hybrid composite wood-polymer structural materials in construction

The paper analyzes the use of wood for the construction of large-span, high-rise and unique buildings and structures. The results of experimental studies of hollow wooden parts, developed by the authors, impregnated with epoxy compositions, modified by sulfoadducts of nanoclusters of carbon ("Ugleron C") are given.
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R.V. Vvedenskij, S.G. Gendler,T.S. Titova
Environmental impact of the tunnel construction 

The object of research are traffic tunnels at the combined road (motorway and railway) the city of Adler to the Alpica Servis alpine resort, which construction and operation was bound up with negative environmental impact. Analysis of the environmental impact of technological processes during the construction and operation of tunnels was carried out data-driven of field study.
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