Magazine of Civil Engineering, No.7(75), 2017




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S.D. Nikolenko, E.A. Sushko, S.A. Sazonova, A.A. Odnolko, V.Ya. Manokhin
Behaviour of concrete with a disperse reinforcement under dynamic loads

Disperse reinforcement of concrete greatly contributes to the properties of the latter. Most research has dealt with the properties of disperse reinforced concrete and influence of disperse reinforcement on structures under a static load of one sign or for a regular dynamic load that is not highly intensive. In practice there might well be alternating dynamic impacts that are highly intensive and over the calculated ones, e.g., seismic ones.
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K.O. Fryanova, V.A. Perminov
Impact of forest fires on buildings and structures

The mathematical modeling of forest fires actions on buildings and structures has been carried out to study the effects of fire intensity and wind speed on possibility of ignition of buildings. The crown forest fire is introduced as a heat and mass source defined by the empirical values of average crown fire temperature and vertical gas velocity at the top crown surface dependent on fire intensity.
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N.S.Sevryugina, M.A. Stepanov
Vertical transport: resource by the criterion of safety

The issue of engineering systems safety in particular of vertical transportation is revealed. Inconsistency in the implementation of theoretical developments in practice is defined because of the probabilistic calculation of the parameters modeled by monotone-logical functions, when real systems are non-monotone functions. The duality of the results of the processes theoretical description is revealed.
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D.A. Dedukh, V.L. Schsuzkiy, A.A. Kuzmenko
Spun concrete properties of power transmission line supports

The article presents results of investigation study of physical and mechanical properties of spun and vibrated samples. Heterogeneity of freshly placed concrete was assessed for change in water to cement proportion, residual water content, density throughout the spun sample height, as well as changes in mechanical properties of hardened concrete.
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V.I. Klimovich, K.V. Pariev
Reliability of scour protection design near the platform "Prirazlomnaja"

Results of experimental researches of scour protection for marine ice-resistant platform (MIRP) "Prirazlomnaja" at impact of irregular waves together with a current are presented and analyzed in the article. Experimental researches were executed taking into account maintenance of the basic similarity criterions.
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S.V. Klyuev, A.V. Klyuev, A.D. Abakarov, E.S. Shorstova, N.G. Gafarova
The effect of particulate reinforcement on strength and deformation characteristics of fine-grained concrete

One of the options to improve the reliability and increase the service life of concrete structures can be a reinforcement of the total volume of fine-grained concrete with different fiber types. The article presents the results of complex researches on studying of influence of parameters of the dispersed reinforcement (fiber, length and type of fiber, dosage by volume) and the material of the fibers of strength of disperse-reinforced fine-grained concrete on a stretching at a bend, the estimation of efficiency and accountability in the calculation of building structures.
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M.P. Sainov, A.O. Zverev
Workability of high rockfill dam with a polymer face

The results of numerical study of stress-strain-state (SSS) of a rockfill dam with a face whose main watertight element is a polymer geomembrane. Analyses were conducted with consideration of non-linearity of contact interaction of structure elements and non-linearity of soil behavior. Bar finite elements were used for modelling of the thin geomembrane.
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N.V. Gusakova, K.E. Filyushina, A.M. Gusakov, N.N. Minaev
Selection criteria of space planning and structural solutions of low-rise buildings

The present study is devoted to development of methodology used for optimal selection of space-planning and structural solutions of low-rise buildings. Objective of the study is developing the system of criteria influencing the optimal selection of space-planning and structural solutions of low-rise buildings and structures aimed at enhancing the efficiency of capital investments, energy and resource saving, creating comfortable conditions for the population considering climatic zoning of the construction site.
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S.A. Kosenko, S.S. Akimov
Performance characteristics of differentially quenched rails

In the present study, we analyze the operation performance of modern differentially quenched rails in comparison with domestic volume-quenched rails and Nippon Steel rails (Japan). For evaluating the wear resistance of rails, in the present study we carried out measurements of their side wear at curves of small radius. As a result of the study, it was found that the resistance to wear of differentially quenched DT350 rails 1.5–1.7 times exceeded the resistance of volume-quenched T1 rails.  
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D.A. Vakulenko, R.A. Turusov
Water resistance of polymer compounds

Composite materials have high physical and mechanical properties, but their widespread use is hampered by a lack of tightness (impermeability to moisture and gases). Mainly this is due to the stress-strain state of the composite structure at the micro level as a result of a comprehensive extension of the polymer owing to the adhesion of the matrix to the fiber.
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Yu.Yu. Galkin, S.A. Udodov, L.V. Vasil'eva
The phase composition and properties of aluminate cements after early loading

It is widely recognized that the effect of loading at the early stages of hardening enables to increase strength characteristics of cement systems and composites based on them. Of particular interest is a study on the effect of compression of aluminate cements on physicomechanical characteristics, hydration process and phase transformations.  
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L.V. Zakrevskaya, P.A. Lubin, S.N. Avdeev, I.A. Gandelsman, S.V. Filippov
Dome houses made of soil-concrete based on local raw materials

The work presents the results of research on the strengthening of soil basement in the center of the urban nucleus of Vladimir, which are loam, sandy loam in soft-plastic state, and also sandy loam with silt. The technology of applying the strengthening composition in the soil has been developed.
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T.V. Ivanova, J. Guan, O.P. Nesterova, S.V. Prokopovich, A.M. Uzdin, D.A. Ivashintzov
Modeling the design seismic input in conditions of limiting seismological information

The object of the investigations is seismic input models used in structure designing under the conditions of limited seismological information. The aim of the given investigation is to propose a new variant of a seismic input model, which should be generated for the structure under consideration, taking into account main peculiarities of actual seismic excitations. The method of design seismic input generation by means of its presentation as a sum of velocity impulse and multi frequency excitation has been developed.  
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Ju.A. Kalugina, D. Keck, Ya.A. Pronozin
Determination of soil deformation moduli after National Building Codes of Russia and Germany

The paper analyzes the differences in carrying out compression tests in accordance with the regulatory documents of Russia and Germany and subsequent processing of the obtained data. The paper gives the reasons for significant differences in the values of compression and design deformation moduli obtained from the compression test data in accordance with Russian and German National Building Codes.
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A.V. Indeykin, S.V. Chizhov, E.B. Shestakova, A.A. Antonyuk, N.I. Kulagin, V.N. Smirnov, V.V. Karpov, D.M. Golitsynsky
Approximated methods of estimation of the reliability of framed railway structures of railway bridges

The development of methods for rapid assessment of the reliability of span structures of beam railroad bridges is relevant in connection with the trend towards increasing loads from the reversing freight rolling stock and the speeds of movement on the main transport with a mixed cargo-and-passenger turnover. This problem is especially urgent for the creation and implementation of special technical conditions (STC) for the design of bridges on high-speed lines (BCM), as in Europe and in America, the process of improving the regulatory framework is actively being implemented and innovative developments in this field.
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I.Ya. Kharchenko, A.P. Pustovgar, S.A. Pashkevich, A.V. Eremin, I.S. Ivanova, Yu.M. Bazhenov, A.I. Kharchenko
Hydration and structure formation during the expanding cement hardening at constrained deformation conditions

The features of expanding cement strength and structure formation at different constrained deformation conditions were studied (without constraint of deformations, uniaxial constraint of deformations, biaxial constraint of deformations, and triaxial constraint of deformations). The study was conducted for three doses of 5 %, 15 % and 25 % of expander on the calcium sulfoaluminate basis in Portland cement of CEM 42.5 mark.
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P.E. Bulanov, L.F. Mavliev, E.A. Vdovin, E.M. Yagund
The interaction between the kaolinite or bentonite clay and plasticizing surface-active agents


The influence of a number of superplasticizers of various chemical bases on the physical and technical properties of clay soils has been studied. Model soils are considered as clay soils: kaolin clay with kaolinite mineral content up to 95 %, bentonite clay with montmorillonite content up to 70%.
 
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