75504 2712-8172 Magazine of Civil Engineering 6 82 2018 1-242
RAR RUS 3-11 St. Petersburg State University of Architecture and Civil Engineering Semenov, Alexey sw.semenov@gmail.com Dynamic buckling of stiffened orthotropic shell structures Explored orthotropic shallow shells of double curvature, as well as cylindrical panels that are reinforced from the concave side by an orthogonal grid of stiffeners. The external transverse load acting on the structure is uniformly distributed and has a linear dependency on time. A geometrically nonlinear variant of the model which also takes into account orthotropy of the material and transverse shears are considered. The model is presented as a functional of total deformation energy of the shell. The algorithm for studying the mathematical model is based on the L.V. Kantorovich method and the Rosenbrock method. The proposed algorithm was implemented in the analytical computing environment Maple 2016. The calculations showed a significant increase in critical load values for the loss of stability when the shell is reinforced with stiffeners. 10.18720/MCE.82.1 stiffened shells buckling orthotropy dynamic loading smeared stiffeners technique Kantorovich method https://engstroy.spbstu.ru/article/2018.82.1/ 01.pdf
RAR RUS 12-16 National Research Moscow State Civil Engineering University Politko Valentin politko@mail.ru 6602848417 0000-0002-0587-4722 National Research Moscow State Civil Engineering University Kantardgi Izmail kantardgi@yandex.ru Level ice forces on hydraulic structures during ice season The current study investigated the variability of the main parameters of drifting level ice during ice season and how this variability affects the ice load. The study was carried out on the example of hydraulic protective structures of the floating nuclear thermal power plant in the city of Pevek. Numerical modeling was performed to determine the ice load reduction factor for the case when the vertical wall is formed by the consolidated ice fragments on an inclined structure. Statistical information on the main ice parameters was gathered and provided in the article. Ice loading calculations were conducted by several calculation methods. Based on the results of the study, general conclusions were made on the specifics of ice loading alternation during ice season and conclusions regarding design ice loading on hydraulic structures in the port of Pevek. 10.18720/MCE.82.2 ice loading ice loading scenarios drifting level ice level ice parameters numerical ice model https://engstroy.spbstu.ru/article/2018.82.2/ 02.pdf
RAR RUS 23-29 Penza State University of Architecture and Construction Martyashin Georgiy nowargore@gmail.com Penza State University of Architecture and Construction Zhegera Kristina jegera@yandex.ru Penza State University of Architecture and Construction Pyshkina Irina glazycheese@gmail.com Adhesive dry mix using an amorphous aluminosilicates In the paper, it is proposed to use synthesized amorphous aluminosilicates as a modifying supplement in cement adhesive dry mixes. The results of the analysis of the chemical composition and microstructure of the developed supplement based on amorphous aluminosilicates used as a modifying supplement in the recipe of adhesive dry mixes are given. A method for evaluating the shear strength of a solution layer using the device GT 2.2.3 is proposed. The methods of testing and instrumentation for evaluating the bond strength of the solution layer are described. In the paper, the bond strength of the developed composition of tile adhesive based on cement with substrates made of gypsum, polystyrene foam (with reinforcing mesh) and foam concrete was evaluated. The results of the evaluation of the shear strength of a solution adhesive layer based on the developed recipe and the prototype relative to the substrate obtained using the developed method and the device GT 2.2.3 are presented. The obtained results were compared with the values of DIN EN 12004. It is established that the adhesive joint based on the developed recipe of the adhesive dry mix is resistant to peeling. 10.18720/MCE.82.3 construction building materials cement dry mix amorphous aluminosilicates bond strength shear strength https://engstroy.spbstu.ru/article/2018.82.3/ 03.pdf
RAR RUS 32-48 Peter the Great Saint Petersburg Polytechnic University Lavrov Nikolai n.lavrov@inbox.ru
Polytechnicheskay, 29
 Kyrgyz-Russian Slavic University named after B.N. Yeltsin Aliev Djouhar djouhar@mail.ru Kuban Statе Agrarian Univеrsity Degtyareva Olga marxotgeo@mail.ru Kuban Statе Agrarian Univеrsity Degtyarev Georgy cst2007@mail.ru Constructive-technological decisions in regulating the flow of atmospheric precipitation Practically all sources of fresh water suitable for agriculture, water supply to the population and vacationists, as well as for industrial development on the Black Sea coast of the Caucasus either have completely exhausted themselves or are on the verge of their possibilities. Further development of the region is directly related to the resolution of this problem. The solution of the problem is possible when the system for regulating precipitation flow is implemented. The proposed system includes small reservoirs located in canyons of mountain gorges. Moreover, it is proposed to create in the gorge both above-ground and underground reservoirs for accumulation of surface and underground flow. Complex hydro-geological conditions of construction, seismicity of the zone, suggest the construction of lightweight buttress dams in the structure of hydrosystems, when the pile foundation directly perceives horizontal shear forces. Complex formulation of the issue required the use of mathematical modeling of the situation on the basis of 3D production, with the analysis of the stress-strain state of the "foundation-dam" system. Dynamic analysis (calculation of eigenvalues) and analysis of seismic impact on the dam are carried out. The carrying capacity of the buttress dam was estimated and the degree of reinforcement was determined, as a result of which it was established that the proposed construction complies with regulatory requirements. Design solutions for the system of regulation of precipitation flow were introduced in production in 2016 in the suburbs of the resort town of Gelendzhik. Successful operation of the system confirms the correctness of theoretical and technological prerequisites and opens up new opportunities in the intensive development of the Black Sea coast of the Caucasus. The proposed system for regulating atmospheric runoff can find application in other regions of the mountain-foothill zone, for example, in the countries of Central Asia. 10.18720/MCE.82.4 flow regulation above-ground reservoir underground reservoir bearing capacity https://engstroy.spbstu.ru/article/2018.82.4/ 04.pdf
RAR RUS 49-58 Semnan university Gerami Mohsen mgerami@semnan.ac.ir Semnan university Hashemi Elahesadat e.s.hashemi@semnan.ac.ir 0000-0001-7802-2013 Semnan University Kheyroddin Ali kheyroddin@semnan.ac.ir
Semnan, Iran
 Probabilistic seismic assessment of concrete frame with mass irregularity As mass irregular structures are more influencing on the behavior of the structures, it is investigated the effect of these irregularities according to the probabilistic approach. Comparison of seismic performance of ten regular and irregular 6-story concrete special moment frame is done, based on the Mean Annual Frequency (MAF) method. The probability of collapse in all irregular models has exceeded the 1 % that is permissible value specified in the ASCE/SEI 7-16. The largest rate of increase in the probability of exceedance the collapse limit state in 50 years, is about 34.1 % in mass irregular structures. Also the results of this study have indicated that both the level of irregularity and the location of irregularity in height is effective in the probability of exceedance the collapse. It should be noted that the critical story in the mass irregular structures is the top story (fifth story). 10.18720/MCE.82.5 probabilistic assessment special concrete moment frame mass irregularity fragility curve Mean Annual Frequency https://engstroy.spbstu.ru/article/2018.82.5/ 05.pdf
RAR RUS 60-67 Moscow State University of Civil Engineering (National Research University) Inozemtcev Sergei inozemcevss@mgsu.ru 37099331400 0000-0003-0815-4621 Moscow State University of Civil Engineering (National Research University) Korolev Evgeniy korolev@nocnt.ru
Moscow, Russia
 Interaction process on the phases interface “bitumen – dispersed phase from cement stone” The results of the study of the effect of the main properties of mineral fillers from cement stone with different degrees of hydration, phase composition and pore volume characteristics on the properties of the bitumen-mineral binder are presented. Dependencies of the influence of mineral filler on the basis of cement stone on the basic parameter of the structure of bitumen-mineral binders-the thickness of the adsorption-solvate layer of bitumen, which was established using the rheological method. Analysis of the empirical data obtained shows that bitumen chemically interacts with mineral fillers obtained from cement stone. It is proved that during the interaction of bitumen with the waste of cement concrete, processes of physical and chemical adsorption take place. Maltenes of bitumen penetrate the pores of cement concrete during physical adsorption. Calcium hydroxide Ca(OH)2 and bitumen active functional groups -OH, -COH, -COOH, C = C-, etc. interact with the formation of new bonds that are reflected in IR spectra in the form of peaks of 820 cm-1, 944 cm-1, 947 cm-1 or 1430 cm-1. The intensity of the given processes and the degree of the structuring of the bituminous films will depend on the degree of hydration of the cement in the fragments of the concrete present in construction waste. When the degree of hydration increases, the thickness of the adsorption-solvate coating of bitumen increases from 1.5 to 2 times. During the interaction of bitumen with the waste of the building cement of concrete, more heat-resistant bitumen films are formed. When the degree of hydration is an increment, the resistance to high-temperature exposure of structured bitumen increases from 1.2 to 2.4 times 10.18720/MCE.82.6 phase interface bitumen filler adsorption adsorption-solvate layer thickness interaction https://engstroy.spbstu.ru/article/2018.82.6/ 06.pdf
RAR RUS 68-80 MC-Bauchemie-Russia Zakharin Evgeny evgeny.zakharin@gmail.com Peter the Great Saint Petersburg Polytechnic University, PRDI “Venchur” Ulybin Alexey ulybin@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Sabri Mohanad Muaya mohanad.m.sabri@gmail.com
Polytechnicheskay, 29
 6507787139 OOO “PI Georekonstruktsiya” Shashkin Konstantin cshashkin@yandex.ru Soil stabilization and foundation restoration using an expandable polyurethane resin The settlement of foundation is one of the main existing problems which face construction engineers during the construction operation processes since the design of a project and through the whole construction life and it leads to bad consequences on the construction. Many methods have been implemented during the last decades to stabilize the soil, lift basements and reduce further settlements. Some of these methods are actively used and effective while others are less effective, have limitations of uses and/or expensive methods. Soil injection technology using an expandable polyurethane resin is an innovative technology which offers an efficient solution for the construction settlements and leads to the stabilization of the soil. The paper demonstrates the results of a full-scale experiment which was implemented in-situ to investigate the effect of the soil injection technology on the lifting of a concrete foundation and on the stiffness of the soil beneath the foundation (soil stabilization) at different soil depths. Dynamic cone penetration test DCPT was applied before and after the injection of the expandable resin in two different plots, one of the plots was injected (the soil has been treated) and the second plot considered as a reference plot where no injection was carried out (with no soil treatment). Results of the soil investigations before and after the injection of the expandable resin are achieved and analyzed. The graphs of DCPT before and after the injection process in different comparison points are incorporated and compared to the geological report of the investigated area. The injection process is explained, and the foundation lifting to the desired level is achieved and explored in this article. 10.18720/MCE.82.7 soil injection technology soil stiffness soil compaction soil stabilization foundation lifting expandable polyurethane resin foundation settlement soil consolidation https://engstroy.spbstu.ru/article/2018.82.7/ 07.pdf
RAR RUS 81-94 Admiral Makarov State University of Maritime and Inland Shipping Knysh Tatiana KnyshTP@gumrf.ru 6506522453 0000-0001-8114-1187 Tashkent Financial Institute Abdikarimov Rustamkhan rabdikarimov@mail.ru
60A, A.Temur street, Tashkent city, 100000
 Admiral Makarov State University of Maritime and Inland Shipping Sukhoterin Mikhail mvs1948@list.ru
Saint-Petersburg, Russia
 Admiral Makarov State University of Maritime and Inland Shipping Baryshnikov Sergey rector@spbuwc.ru
St. Petersburg, Russia
 Natural oscillations of a rectangular plates with two adjacent edges clamped We study the natural oscillations of a rectangular plate, two adjacent edges of which are clamped, and the other two are free (CCFF-plate), as an element of many building structures. The deflection function is chosen as a sum of two hyperbolic trigonometric series. Both series obey the main equation of free vibration. Meeting all boundary conditions of a problem leads to an infinite system of homogeneous linear algebraic equations with respect to eight series coefficients. This system is transformed in two subsystems due to four basic coefficients, for which the iterative solution process is organized. Initial values of a pair of basic coefficient series are chosen randomly. Frequency values are chosen so that iterations coincide starting with a certain number. This provides non-trivial solutions of the reduced system. For the first eight obtained natural frequencies there have been presented relevant 3D mode shapes. The paper provides accuracy analysis and its comparison with other familiar results. 10.18720/MCE.82.8 civil and structural engineering building and construction rectangular plate accurate natural frequency resonance fourier series https://engstroy.spbstu.ru/article/2018.82.8/ 08.pdf
RAR RUS 95-102 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Bespalov Vladimir chanchullero@yandex.ru
Polytechnicheskay, 29
 57189360151 0000-0001-6867-4050 West Pomeranian University of Technology Szczecin Orlovich Romuald orlowicz@yandex.ru
al. Piastów 17, 70-310 Szczecin, Poland
 West Pomeranian University of Technology Szczecin Nowak Rafal rnowak@zut.edu.pl Strength evaluation of the Prussian vaults made from brick aggregate concrete The behavior of Prussian vaults of brick aggregate concrete differs both from the behavior of brick vaults and classical flat slabs. Such vaults are particularly susceptible to physical damage and deterioration. To determine the real bearing capacity of the vaults, the authors not only performed the insitu determination on several sections with deflection control, but also numerical simulations of the multispan system of Prussian vaults in the program complex Abaqus. Moreover, experimental comparisons between damaged and not damaged vaults were also performed in the historical building of the New Holland complex. Obtained results show that, the vaults adjacent to the loaded one exhibit opposite behavior and significant damages caused by the loaded one, both of which are useful outcomes for evaluation of this vaulting type. 10.18720/MCE.82.9 masonry structures compression bending element damaged structures building inspection masonry vaults strengthening masonry arches simulation https://engstroy.spbstu.ru/article/2018.82.9/ 09.pdf
RAR RUS 103-111 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Velichkin Viktor V.Velichkin2011@yandex.ru
Polytechnicheskay, 29
 56226922300 Peter the Great Saint Petersburg Polytechnic University Korsun Volodymyr korsun_vi@mail.ru
Polytechnicheskay, 29
 56296687300 0000-0002-2299-3096 Peter the Great Saint Petersburg Polytechnic University Rybakov Vladimir fishermanoff@mail.ru
Polytechnicheskay, 29
 B-6662-2019 57204916380 0000-0002-6877-8420 Peter the Great Saint Petersburg Polytechnic University Kozinetc Galina galina4410@yandex.ru
St. Petersburg, Russia
 Lightweight steel concrete structures technology with foam fiber-cement sheets Lightweight steel concrete structures (LSCS) constitute an innovative building structure type that can be used both for load-bearing and enclosing purposes. They consist of steel profile – usually galvanized and cold-bent – filled with a monolithic foam concrete with 200 kg/m3 and more density value, and with fiber cement panel sheathing. These structures can be used in industrial and civil buildings as internal and external bearing and enclosing wall structures, and as slabs. According to the LSCS production method, prefabricated panels (walls and slabs) and building site performed constructions are distinguished. The article presents the experimental studies on bearing capacity of LSCS subspecies i.e. representing slab panels made of galvanized steel profile, medium grade density monolithic foam concrete D400, and sheathing boards “Steklotsem”. The paper confirms that such panels can be used in civil buildings and withstand the appropriate load, regulated by the current codes and rules. Moreover, it has been experimentally proved that the foam concrete, despite its own extremely low strength class, actually includes in the operation, preventing such effects as stability local loss, destruction and profile steel elements warping and increases the slabs overall load capacity by 20–25 %. 10.18720/MCE.82.10 concrete structures foam concrete fiber-cement sheets lightweight steel concrete structures (LSCS) https://engstroy.spbstu.ru/article/2018.82.10/ 10.pdf
RAR RUS 112-126 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 "Kitezh" LLC Architecture and Construction Company Zhgutov Vladimir abc.kitezh@gmail.com
St. Petersburg, Russia
 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Khodzhaev Dadakhan khodzhaevda@mail.ru Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Normuminov Bakhodir bnormuminov1977@mail.ru S-1676-2017 6507460407 0000-0002-8907-7869 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Mirsaidov Mirziyod theormir@mail.ru
39, Kori Niyoziy St., Tashkent, Uzbekistan, 100000
 6506522453 0000-0001-8114-1187 Tashkent Financial Institute Abdikarimov Rustamkhan rabdikarimov@mail.ru
60A, A.Temur street, Tashkent city, 100000
 Nonlinear parametric oscillations of viscoelastic plate of variable thickness Isotropic viscoelastic plates of variable thickness under the effect of a uniformly distributed vibration load applied along one of the parallel sides, resulting in parametric resonance (with certain combinations of eigenfrequencies of vibration and excitation forces) are considered in the paper. It is believed that under the effect of this load, the plates undergo the displacements (in particular, deflections) commensurate with their thickness. Geometrically nonlinear mathematical model of the problem of parametric oscillations of a viscoelastic isotropic plate of variable thickness is developed using the classical Kirchhoff-Love hypothesis. Corresponding nonlinear equations of vibration motion of plates under consideration are derived (in displacements). The technique of the nonlinear problem solution by applying the Bubnov-Galerkin method at polynomial approximation of displacements (and deflection) and a numerical method that uses quadrature formula are proposed. The Koltunov-Rzhanitsyn kernel with three different rheological parameters is chosen as a weakly singular kernel. Parametric oscillations of viscoelastic plates of variable thickness under the effect of an external load are investigated. The effect on the domain of dynamic instability of geometric nonlinearity, viscoelastic properties of material, as well as other physical-mechanical and geometric parameters and factors (initial imperfections of the shape, aspect ratios, thickness, boundary conditions, excitation coefficient, rheological parameters) are taken into account. The results obtained are in good agreement with the results and data of other authors. The convergence of the Bubnov-Galerkin method is verified. 10.18720/MCE.82.11 thin-walled structures plates shells variable thickness periodic load dynamic instability domain https://engstroy.spbstu.ru/article/2018.82.11/ 11.pdf
RAR RUS 127-135 H-9967-2013 16412815600 0000-0002-8588-3871 National Research University "Moscow Power Engineering Institute" Kirsanov Mikhail mpei2004@yandex.ru
14, Krasnokazarmennaya, 111250 Moscow, Russia
 Analytical calculation of the frame with an arbitrary number of panels A rod model of a statically determinate planar frame with four supports is proposed. The task is to obtain an analytical dependence of the deflection of the truss under the action of various loads on the number of panels in the crossbar and in vertical support trusses. To solve the problem, the computer mathematics system Maple is used. The system of equations of equilibrium is solved in symbolic form. It is shown that for a certain number of panels in the crossbar the determinant of the system of equations of equilibrium turns to zero, which indicates a kinematic changeability of the structure. The corresponding velocity distribution of the nodes of the truss is found. For cases of unchangeable construction, the deflection is found from the Maxwell-Mohr’s formula. A series of solutions for various numbers of panels is generalized by the method of double induction. Using the operators of the Maple system, homogeneous linear recurrence equations are derived and solved for the terms of the coefficients of the desired formula. On the graphs of the dependence of the deflection on the number of panels, significant jumps and extreme points are revealed. To evaluate the strength and stability of the construction, expressions for the forces in the individual most stretched and compressed rods in the middle of the span are found. The cases of loading the truss along the upper belt, the lower belt and the force in the middle of the span are considered. The solutions found can be used to evaluate the operability of the designed design and to optimize it. 10.18720/MCE.82.12 core frame deflection Maple analytical solution induction truss kinematic degeneracy https://engstroy.spbstu.ru/article/2018.82.12/ 12.pdf
RAR RUS 136-148 National Research Moscow State Civil Engineering University Bulgakov Boris fakultetst@mail.ru Ruhr Universität Bochum Anh Pham Ngoc.Pham-a1r@rub.de National Research Moscow State Civil Engineering University Lam Tang lamvantang@gmail.com
Moscow, Russia
 57203962119 0000-0001-9723-5161 National Research Moscow State Civil Engineering University Nguyen Trong-Chuc ntchuc.mta198@gmail.com Composition calculation and cracking estimation of concrete at early ages Recently, variety of large-scale constructions from monolithic concrete structures have been built in different regions of Vietnam. The application fields of these structures are extensive including the marine construction, underground structures, the high-rise building erection and others. However, structures damage and cracking, caused by temperature stresses, become more popular and strong impact on operation reliability and durability. In this study, the American standard ACI 211.1-09 was used to determine the composition of heavyweight concrete for bridge foundation construction with sized 8 x 6 x 2.5 m. Assessment of the crack formation possibility in the concrete at an early age was made by analysis of temperature regime and the thermal-stress. The conducted studies' result provided the possibility of obtaining heavyweight concrete from Vietnam local raw materials with the workability of concrete mixture on 95 mm standard cone, compressive strength of 36.3 MPa heavyweight concrete at the age of 28 days of normal hardening and an average water resistance of 0.32 MPa samples. By applying the computer program MIDAS CIVIL, the maximum temperature in the concrete foundation center which was determined after 72 hours from the commencement of mixing of raw materials with water, equal to Tmax = 73.04 °C. At the same time, the structure temperature difference between the center (node 97) and surface (nodes 141 and 98) was 31.7 °C. In addition, at nodes 141 and 98 (in the external nodes) of the concrete foundation at 30 hours of concrete hardening, the tensile stress is greater than the tensile strength of the concrete leading to crack formation on concrete surface. Therefore, in order to prevent cracking, it is necessary to ensure proper care of the foundation surface during the concrete hardening. In the center of the concrete foundation (node 97), the tensile stress is higher than the allowable tensile strength at 590 hours of hardening concrete. Meanwhile, its strength is also quite high, the risk of concrete foundation center cracking caused by the heat release during cement hydration will not be serious great. 10.18720/MCE.82.13 crack formation foundation of the bridge tensile stress maximum temperature tensile strength temperature regime thermalstress https://engstroy.spbstu.ru/article/2018.82.13/ 13.pdf
RAR RUS 149-162 Semnan university Gerami Mohsen mgerami@semnan.ac.ir Semnan University Kachooee Ali ali.kachooee@semnan.ac.ir Semnan University Kafi Mohammad Ali mkafi@semnan.ac.ir Local fuse for improving concentric braces behavior The concentrically braced system is one of the most common lateral load bearing systems among steel structures. These systems have remarkable lateral stiffness and strength, but their compressive buckling prevents them from being ductile and absorbing optimal energy. In this study to solve this problem, by using numerical and experimental studies, a heuristic method is presented. In this method, a local fuse is used along the rectangular hollow section brace. This fuse is mounted by internal and external auxiliary elements to prevent its local buckling under compressive load. This makes the brace behave in a similar manner in both tensile and compressive cyclic loads, resulting in ductile behavior and high-energy absorption. Also in this study, by using numerical results, an investigation is done for the proper position of the fuse along the braces and its optimal shape. 10.18720/MCE.82.14 local fuse concentric brace ductility energy dissipation capacity load bearing capacity steel structure https://engstroy.spbstu.ru/article/2018.82.14/ 14.pdf
RAR RUS 163-169 Civil Defence Academy EMERCOM of Russia Budykina Tatyana tbudykina@yandex.ru Treatment of wastewater resulting from iron ore beneficiation The overall objective of this article is to study the potential of the reagent treatment of wastewater resulting from the iron ore beneficiation process, as well as preventing the discharge of the wastewater into the open waters. The wastewater at the Mikhailovskii iron ore beneficiation plant (Kursk Region, Russia) discharged into a tailings pond has become an object of the research. This article looks at the sedimentation kinetics of the wastewater resulting from the wet magnetic separation of iron ores. The results of the kinetic studies allow one to predict the efficiency of water clarification and the necessary duration of sedimentation of the recycled water of the iron ore processing plant in sedimentation facilities. It has been experimentally shown that the wastewater resulting from iron ore beneficiation plants contains kinetically stable suspended substances with a hydraulic size of less than 0.013 mm/s. The efficiency and time of wastewater clarification through the reagentless sedimentation depends on the hydraulic size of the suspended solids and the depth of the settling zone. The analysis proves the efficiency of an advanced wastewater treatment, which entails reagent sedimentation with the use of aluminum polyoxychloride AquaAurat 18 and flocculant Praestol 853. This approach helps to obtain the required quality of water for discharge into open reservoirs and to reduce the concentration of suspended solids by 99.6 % and total dissolved solids by 30 %. The preferable reagents dose, their ratio, as well as the method of the advanced wastewater treatment are determined. 10.18720/MCE.82.15 wastewater iron ore beneficiation magnetic separation suspended solids hydraulic size sedimentation coagulants flocculants https://engstroy.spbstu.ru/article/2018.82.15/ 15.pdf
RAR RUS 170-190 57194112309 0000-0001-6184-2365 Vyatka State University Tyukalov Yury yutvgu@mail.ru Finite element models in stresses for bending plates Finite element models for plate bending problems are constructed on the basis of approximations of moments fields. The bending and twisting moments are approximated in the finite element area by piecewise constant functions. The solution is based on the functional of the additional energy. Algebraic equations of equilibrium of nodes of grid of finite elements are formed using the principle of possible displacements and are included in the functional with the help of Lagrange multipliers. The necessary expressions for rectangular and triangular finite elements are obtained. Calculations of square clamped and hinged-supported plates on the action of uniformly distributed load are performed. Comparison of the obtained results with the results by the finite element method calculations in displacements is presented. It is shown that the presented method of calculating bent plates by the finite element method in stresses has the property of convergence from above. The displacements obtained by this method converge to the exact values from above, while the values of the moments is determined with reserve. When the grid of finite elements is crushed, the difference of the two solutions, in stresses and in displacements, decreases monotonically and the accuracy of the obtained results can be estimated from the value of this difference. 10.18720/MCE.82.16 finite element method moments approximation bending plates buildings constructions https://engstroy.spbstu.ru/article/2018.82.16/ 16.pdf
RAR RUS 191-198 Kazan State University of Architecture and Engineering Kayumov Rashit kayumov@rambler.ru 6602522532 0000-0003-2714-519X Kazan National Research Technological University Deberdeev Timur deberdeev@mail.ru
Kazan, Russia
 Kazan National Research Technological University Leksin Vladimir leksinvv@rambler.ru Riga Technical University Sprince Andina andina.sprince@rtu.lv 56504969400 0000-0001-8879-1190 Kazan State University of Architecture and Engineering Ibragimov Ruslan rusmag007@yandex.ru
Kazan, Russia
 37099331400 0000-0003-0815-4621 Moscow State University of Civil Engineering (National Research University) Korolev Evgeniy korolev@nocnt.ru
Moscow, Russia
 Efficiency of activation of mineral binders in vortex-layer devices Improving the efficiency of construction composites is a relevant problem for modern-day material science. One of the ways to solve the problem consists in activating the binders by means of vortex-layer devices. Mathematical transformations produced a formula for calculating the dependency of the number of ferromagnetic-particle collision on the number and velocity of such particles, as well as on the device chamber fill factor. The results obtained by applying the proposed formula differ from D.D. Logvinenko's model by 10 % at max. We calculated the impact force, the impulse of the grinding body in the vortex-layer device, as well as the amount of applied energy per unit of mass of the ground material. It was found out that the impact force and the impulse of force were maximized in the test device. At the same time, energy applied over the grinding time necessary to even out the binder dispersion in the vortexlayer device was 2 to 4.8 times greater compared to conventional devices. 10.18720/MCE.82.17 device vortex layer activation impact energy https://engstroy.spbstu.ru/article/2018.82.17/ 17.pdf
RAR RUS 199-207 Baltic State Technical University “VOENMEH” Shasurin Aleksandr shashurin_ae@voenmeh.ru The efficiency of the noise barrier installed on the acoustically untreated gallery The research is targeting at multi-level overpasses which offer one of the solutions for laying the highway in conditions of dense residential development and close proximity to bedroom communities. In terms of acoustics, multi-level overpasses are semi-enclosed structures made of metal and reinforced concrete, where a complex sound field with numerous re-reflections is formed. There is no method of calculating noise from such structures in the literature of our country, therefore forecasting sound levels in the adjacent residential areas while designing noise mitigation measures is extremely challenging. The article proposes the method of calculating the efficiency of the noise barriers installed on the overpass edge based on the statistical theory of acoustics. The main assumption of the proposed model is the allocation of semi-closed volume in an acoustically untreated overpass and generation of a diffuse sound field in it, which is fundamentally different from the currently used methods for calculating the efficiency of the barriers installed in galleries as the barriers located in the open space, similar to motorways on the earth roadbed. When considering the diffuse field, the sound is not diffracted over the upper free edge of the barrier, but radiated outwards through the opening. According to the calculation results using the derived formulas, the efficiency of the barrier installed on the overpass does not exceed 2–6 dBA at its different heights, which corresponds to experimental results. 10.18720/MCE.82.18 noise barrier gallery noise in residential development acoustic efficiency https://engstroy.spbstu.ru/article/2018.82.18/ 18.pdf
RAR RUS 208-218 Far Eastern Federal University Mochalov Aleksandr captainvmf@yandex.ru
8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia
 Daghestan State Technical University Otsokov Kamil fedyuk.rs@dvfu.ru V.G. Shukhov Belgorod State Technological University Lashina Irina lashina.irishka@yandex.ru 57194347544 Far Eastern Federal University Timokhin Roman gera210307@yandex.ru
8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia
 57199850188 0000-0002-2279-1240 Far Eastern Federal University Fediuk Roman roman44@yandex.ru
8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia
 V.G. Shukhov Belgorod State Technological University Lesovik Valeriy naukavs@mail.ru Composite binders for concrete of protective structures The composite binders, obtained as a result of joint mechanochemical activation of Portland cement, rice husk ash, quartz sand, screening of limestone crushing and plasticizing additive were considered. The type of binder influence to the rheological and mechanical characteristics of selfcompacting concrete mixtures and fiber-reinforced concrete is established. By scanning electron microscopy, it was revealed that the application of the developed binder leads to the compacting of the microstructure, with lamellar and acicular neoplasms filling the isometric and anisometric pores. This leades to the formation of a rigid matrix with a lower porosity, which in turn leads to an increase in the compressive strength of the formed cement stone above 70 MPa. The use of a composite binder increases the physical and mechanical characteristics of fine-grained concrete accordingly (Rcompr over 80 MPa, elastic modulus greater than 40 GPa). The studied rheological characteristics showed that all mixtures with the use of composite binder meet the requirements of fluidity and segregation resistance for self-compacting concrete mixtures. The revealed indexes of shock endurance of fiber-reinforced concrete (30 % higher than for standard reinforced concrete) allow using this material for protective structures. 10.18720/MCE.82.19 self-compacting concrete composite binder pozzolanic materials technogenic raw materials fresh properties mechanical properties https://engstroy.spbstu.ru/article/2018.82.19/ 19.pdf
RAR RUS 219-227 57206900881 0000-0002-8892-4085 Ogarev Mordovia State University Yakunin Vladislav vladisjakunin@yandex.ru Ogarev Mordovia State University Bogatov Andrej bogatovad@list.ru LLC “Kombinat teploizolyacionnyh izdelij” Bochkin Viktor sovelitnew@mail.ru Ogarev Mordovia State University Chegodajkin Aleksej chegoday1@mail.ru 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir al_rodin@mail.ru 57191249816 0000-0002-8080-9808 Ogarev Mordovia State University Rodin Alexander al_rodin@mail.ru Alkali-activated slag binders from rock-wool production wastes The article exposes the results of studies on the production of alkali-activated slag binders from rock-wool production wastes and their composite derivatives, which are resistant to corrosive effects of biological environment. Thermal analysis showed that the structurization in the "rock wool production waste-water-NaOH" system is most efficient with the NaOH/waste ratio of 0.02–0.03, and the main newlyformed phases in the solidified alkali-activated slag composites are low-basic calcium hydrosilicates and analcime. The best values of the physical and mechanical properties of obtained binders are achieved with a waste grinding fineness of 400–450 m2/kg. The compressive strength of the developed composite materials reaches 68 MPa and bending strength is 13.5 MPa with a waste grinding fineness of 300 m2/kg. Composites based on binders made of rock-wool production waste are waterproof and funginert, and individual compounds are fungicidal. 10.18720/MCE.82.20 alkali-activated slag binder rock-wool production waste composite biological resistance https://engstroy.spbstu.ru/article/2018.82.20/ 20.pdf
RAR RUS 228-242 JSC “B.E. Vedeneev VNIIG” Davidenko Vyacheslav davidenkovm@vniig.ru Peter the Great Saint Petersburg Polytechnic University Ivanov Sergey S.Ivanov1948@gmail.ru
Polytechnicheskay, 29
 JSC “B.E. Vedeneev VNIIG” Klimovich Vitaly klimvita@yandex.ru JSC “B.E. Vedeneev VNIIG” Voronkov Oleg voronkovok@vniig.ru Numerical modelling of tides and tsunami waves propagation Modelling of tides and tsunami waves propagation is important problem for the hydraulic engineering practice since it allows to predict characteristics of these phenomena (load, values of run up and flooding zones, propagation times to structures and so on) and to make reasonable choice of design solution for coastal structures. Numerical modeling is effective way to simulate tides and tsunami waves propagation. Results of simulations of tides and tsunami waves propagation on the basis of shallow water model are presented and analyzed in the article. It was considered explicit and implicit numerical scheme for solution of shallow water model equations, which were verified on the number of experimental results including experimental data on distribution of dam-break wave propagation on a dry and sloping bottom. It is shown that the numerical data of tides in Persian Gulf are well co-ordinated with the data of tidal tables, both on time and on level of tides in various points. Numerical results of tsunami waves propagation in the Krasheninnikov Bay and Kozmino Bay are presented at various angles of tsunami at open boundary of computed area. Numerical results of tide currents for Krasheninnikov Bay are presented for various velocities of a wind. Developed programs may be used, particular, for numerical calculations of impact characteristics of tsunami waves on structures in coastal and offshore zones according requirements of Russian normative documents. 10.18720/MCE.82.21 tide tsunami wave long wave numerical algorithm hydraulic structure bay shallow water model https://engstroy.spbstu.ru/article/2018.82.21/ 21.pdf