Magazine of Civil Engineering, No.5(81), 2018

E.Yu. Polishchuk, A.B. Sivenkov, S.K. Kenzhehan
Heating and charring of timber constructions with thin-layer fire protection

The results of fire tests of constructions (beams) with fire retardant film coating in one-side fire effect under standard temperature fire regime are shown in this article. Intensity dynamics of samples heating and their charring process in thickness and along the perimeter were chosen as the key indicators.
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N.S. Bolshakov, V.L. Badenko, A. Celani
Site-selection on the basis of territorial analysis methods

The object of research is the site-selection process for the rental housing construction. This form of real estate is becoming more widespread in the west, while in Russia it’s development is currently on initial stage.
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M.V. Petrochenko, V.Z. Velichkin, Y.N. Kazakov, Y.B. Zavodnova
Reliability assessment of the construction schedule by the critical chain method

Implementation of the construction projects is associated with significant current material, technical and financial costs. They increase significantly in case of the breaking deadlines the large stages of projects and putting buildings into operation.
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A.V. Alekseytsev, S.A. Akhremenko
Evolutionary optimization of prestressed steel frames

A method for the optimal synthesis of prestressed steel frame structures is developed. The search for a solution is being carried out by applying discrete sets of variable parameters, including cross-sections of structural rods and cross-sections of prestressing tie-rods. It is possible to vary the location of the prestressing system.
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E.S. Zalata, Y.Y. Shavrov, K.I. Strelets, M.S. Emelyanova 
Productivity of microalgae as biofuel for bioadaptive systems of facades

Microalgae are one of the promising fuel sources and many specialists associate it with the future of alternative energy. A promising area of application of photobiological devices is their conjugation with the architectural covers of a building and formation of bio-adaptive facades. The determining criteria for the organization of the microalgae biomass production process in the facade structure is solar radiation, ratio of light and dark growth phase and ambient temperature.
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V.N. Alekseenko, O.B. Zhilenko, M. Al Ali
Bearing capacity of pasted anchors in the masonry walls of natural limestone

The joint work of pasted steel anchors and wall masonry elements from natural limestone is discussed in the article. The aim of the scientific work is the development of a technique for calculating the load-bearing capacity of anchors in masonry walls from natural limestone and the development of nomograms for the rapid evaluation of the bearing capacity of anchors.
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O.P. Nesterova, A.M. Uzdin, M.Yu. Fedorova
Method for calculating strongly damped systems with non-proportional damping

The calculation of systems under seismic excitations is performed both dynamically by time integration and quasistatically under inertial seismic loads using linear response-spectra method (RSM). Dynamic timing calculation can be performed either using direct integration of the initial system of motion equations, or by using the spectral decomposition of motion equations by shape modes. RSM is completely based on spectral decomposition.
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V.I. Travush, N.V. Fedorova
Survivability of structural systems of buildings with special effects

The technique of calculation analysis of survivability of reinforced concrete statically indeterminate beams and rod structural systems of buildings and structures under emergency influences is given.
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V.K. Akhmetov, V.Ya. Shkadov, P.N. Konon
Aerodynamics of building structures for flue gas removal

Natural fuel burning in modern heat power plants with flue gas formation is accompanied with harmful environmental impact and potential opportunity of acid fallout. This can lead to local or even global catastrophe under adverse circumstances.
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B.B. Teltayev, C.O. Rossi, S.Zh. Ashimova
Composition and rheological characteristics of bitumen in short-term and long-term aging

This paper investigates the impact of sequential short-term and long-term aging of blown bitumen of the grade BND 70/100 on its mechanical characteristics in the temperature interval from 76° to -36 °. Group chemical composition of the bitumen has been determined by the method of liquid adsorption chromatography by the chromatograph “Gradient M”.
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V.G. Artiukh, E.A. Galikhanova, V.M. Mazur, S.B. Kargin
Energy intensity of parts made from polyurethane elastomers

Laboratory testing with determination of strength and energy characteristics of materials for elastic elements of shock absorbers helped to establish that polyurethane elastomers, having the highest values of specific energy consumption and a wide range of alternating dissipation and rigidity characteristics were the best materials.
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N.A. Anikina, V.F. Smirnov, O.N. Smirnova, E.A. Zaharova
Protection of construction materials based on acrylates from biodeterioration

The article is dedicated to the funginertness of different construction materials based on acrylates: emulsions Lakroten E-21, Lakroten E-31, Latacryl ZM-1, and Latacryl AF, as well as metacrylate, metacrylate copolymer with metacrylic acid, and n-chlorophenylmetacrylate acrylic glasses.
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T.S. Shepelenko, N.P. Gorlenko, O.A. Zubkova
Structurization processes of cement composites modified with electrolytic additives

There has been research on the impact of AlCl3 and FeCl3 solutions on kinetics of cement hardening. The research was carried out in two comparative versions, one of which had the saline solutions introduced into cement as gauge liquid (“water–1% electrolytic solution”), the other had them as additives, synthesized in suspensions “cement – (water–1% electrolytic solution)”.
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M.P. Sainov, V.B. Soroka
Ultra-high rockfill dam with combination of the reinforced concrete face and clay-cement diaphragm

The article deals with design validation of a new type of an embankment dam structural design, i.e. rockfill dam with combination of two types of non-soil seepage-control elements – a reinforced concrete face (in the dam upper part) and a clay-cement diaphragm made of bored piles (in the dam lower part).
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A.A. Lukashevich
Computational modelling of stiffness and strength properties of the contact seam

The problem of contact interaction of structures taking into account the deformation and strength properties of the contact seam material is considered. To discretize the contact layer, frame-rod contact finite elements (CFE) are used, by means of which the physical properties of the seam material (initial strength, line and nonlinear deformability) are modelled.
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V.I. Kolchunov, A.I. Dem'yanov
The modeling method of discrete cracks in reinforced concrete under the torsion with bending

The most famous of computer systems for the design of reinforced concrete structures in the world are taken into account only regular dispersed cracks. Completely different criteria should be used when analyzing the appearance and development of discrete cracks in reinforced concrete, the modeling methodology of which has not been developed to date.
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M.N. Kirsanov
Installation diagram of the lattice truss with an arbitrary number of panels 

Hereby the diagram of a flat statically determinate regular lattice truss with the parallel chords is proposed. The task is to obtain an analytical dependence of the truss deflection and forces in the most tension and compressed bars on the number of panels. In order to solve the problem, the Maple computing mathematical system is used.
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N.I. Vatin, I.I. Pestryakov, Sh.T. Sultanov, T. Ogidan, Y.A. Yarunicheva, A.P. Kiryushina
Water vapour by diffusion and mineral wool thermal insulation materials

This article is aimed at determining the absorption of moisture by diffusion of mineral wool and polyisocyanurate over a long-term period. The task of increasing the thermal insulation properties of enclosing structures is most relevant for the erection of new buildings or structures, as well as for the repair of existing.
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A.A. Koshcheev, S.I. Roshchina, M.V. Lukin, M.S. Lisyatnikov
Wooden beams with reinforcement along a curvilinear trajectory

The article is devoted to the investigation of a new type of reinforcement of wooden beams for floors and coatings with using steel cable reinforcement located in a solid wood along a curved S-shaped trajectory. The basic principles of a new type of reinforcement are set up. The schemes of various reinforcement paths are given. Mathematical models of studied structures are formed.
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V.A. Pukhkal, A.B. Mottaeva
FEM modeling of external walls made of autoclaved aerated concrete blocks 

The FEM-analysis of factors influencing the heat transfer properties of external walls made of autoclaved aerated concrete blocks is presented. Using the ELCUT program, the external wall temperature fields made of autoclaved aerated concrete blocks were calculated for different values of thermal conductivity for laying cement mortar and laying with adhesive.
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