75504 2712-8172 Magazine of Civil Engineering 8 76 2017 1-297
RAR RUS 3-19 North-Caucasian State HumanitarianTechnological Academy Bayramukov Salis salis_pochta@mail.ru North-Caucasian State HumanitarianTechnological Academy Dolaeva Zurijat dolaeva.zu@mail.ru Dynamic programming in optimization of comprehensive housing stock modernization Research in the area of dynamic programming in optimization of comprehensive housing stock modernization has shown that there are a number of important issues that require effective and rapid solutions. The purpose of research is the organization of repair and construction works by modeling the organizational and technological solutions to the use of energy-saving technologies for the comprehensive modernization of the housing stock. The proposed method of an integrated approach to the modernization of the housing stock and, accordingly, the implementation of energy saving measures will reduce the cost of homeowners to pay for housing and communal services by improving the thermal performance of buildings. Formulated and discussed the theoretical aspects of dynamic programming for solving problems of optimal allocation of allocated funds having minimal losses, which allows calculating the conditions for the implementation of energy-modernization. The mathematical model of optimization of process of energy-modernization. Is executed economic assessment of energy saving decisions in the course of complex energy-modernization, are given results of calculations of distribution of the allocated funds and payback periods on of holding actions for increase in indicators of energy saving. 10.18720/MCE.76.1 housing stock; comprehensive modernization; economic efficiency; payback period; energy saving technologies; optimization; dynamic programming https://engstroy.spbstu.ru/article/2017.76.1/ 01.pdf
RAR RUS 20-27 Peter the Great Saint Petersburg Polytechnic University Kitain Mikhail mikhail.kitain@gmail.com
Polytechnicheskay, 29
 Peter the Great St. Petersburg Polytechnic University Strelets Kseniya kstrelets@mail.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great Saint Petersburg Polytechnic University Petrochenko Marina mpetroch@mail.ru
Polytechnicheskay, 29
 Hot metal droplets capture with centrifugal method Weld spatter properties and ways of spatter formation were analyzed in the article. It was deter-mined that solidified spatter can be considered as an active agent in environment pollution due to high dispersion, and there is a mass excess comparing with spatter spray. Hot metal droplets were used to track the flow of jets. The major part of spatter being under solidification has the size of 200 micron by dispersion and can be picked up by modern exhaust devices. The time of droplets solidification reaching heat content magnitudes able to cause firing of cloth filters in dust-tripping devices was determined during the experiment. There was elicited 100 % capture performance of hot metal droplets being under solidification in a uniflow cyclone CP-2500 (ЦП-2500) using marking tracers from particulate matter determination method. 10.18720/MCE.76.2 hot metal droplets filtration; uniflow cyclone; weld spatter; air purification; explosive dust https://engstroy.spbstu.ru/article/2017.76.2/ 02.pdf
RAR RUS 28-39 56296687300 0000-0002-2299-3096 Peter the Great Saint Petersburg Polytechnic University Rybakov Vladimir fishermanoff@mail.ru
Polytechnicheskay, 29
 Technical University in Košice Al Ali Mohamad mohamad.alali@tuke.sk Peter the Great Saint Petersburg Polytechnic University Panteleev Anton a.p.panteleev@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Fedotova Kseniya himole@rambler.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Smirnov Andrei andrewsmirnov@inbox.ru
Polytechnicheskay, 29
 Bearing capacity of rafter systems made of steel thin-walled structures in attic roofs In the article as an alternative оf strengthening of existing rafters or replacing them by new timber elements there is an offer to consider the replacing timber rafters by elements of steel thinwalled structures (STWS). The authors have proposed the methodology for calculation the statically indeterminate frame structures with the use of force method. Selected sections of rafters made of STWS and timber for various constructive schemes of pitched roofs were analyzed. The results shown that using of STWS reduces the major repair cost by 13.5 % due to less material consumption compared with a timber structure. 10.18720/MCE.76.3 stress strain state force method statically indeterminate systems attic roofs steel thin-walled structures timber rafter structures https://engstroy.spbstu.ru/article/2017.76.3/ 03.pdf
RAR RUS 40-49 7101634822 Peter the Great Saint Petersburg Polytechnic University Fedorov Mikhail m.fedorov@spbstu.ru
St. Petersburg, Russia
 Peter the Great Saint Petersburg Polytechnic University Chusov Alexander chusov17@mail.ru
Polytechnicheskay, 29
 6507413522 Peter the Great St. Petersburg Polytechnic University Maslikov Vladimir vmaslikov@list.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 56237664900 Peter the Great St. Petersburg Polytechnic University Molodtsov Dmitry molodtsov_dv@spbstu.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great Saint Petersburg Polytechnic University Togo Issa issatogo@mail.ru
Polytechnicheskay, 29
 The simulation models of river flow management by a system of flood control facilities The authors propose the simulation models of river flow management during extreme river discharges for а hydro complex with a hydroelectric power plant (HPP) on a main river and a flood control facility on its side tributary, including the case of their joint operation as part of a system of flood control facilities distributed on a drainage basin. The possibility of applying the previous years’ watermanagement plans for the choice of flood control facilities locations is considered. In the mathematical model of a hydro complex, operating modes of a HPP are assigned using its reservoir operating rule curves, considering the requirements of safety and environmental protection. In the mathematical model of a flood control facility, the scheme for flood discharge through uncontrolled bottom spillways and an uncontrolled surface spillway is considered. The use of the models makes possible to determine the operating modes of hydro facilities, considering the modern economic and environmental requirements, revision of their parameters, estimation of the energy-economic and environmental effects from the creation of systems of flood control facilities distributed on drainage basins. 10.18720/MCE.76.4 hydrotechnical construction; mathematical simulation; flood control; hydro facilities; river flow management; environmental protection https://engstroy.spbstu.ru/article/2017.76.4/ 04.pdf
RAR RUS 50-57 Peter the Great Saint Petersburg Polytechnic University Castro Jose jose.castro.lozano@hotmail.com
Polytechnicheskay, 29
 Peter the Great St. Petersburg Polytechnic University Zaborova Daria
St. Petersburg, Russia
 57189345350 0000-0002-8380-0067 Peter the Great St. Petersburg Polytechnic University Koriakovtseva (Musorina) Tatiana
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great Saint Petersburg Polytechnic University Arkhipov Ivan ivan-arhipov-95@mail.ru
Polytechnicheskay, 29
 Indoor environment of a building under the conditions of tropical climate This paper is focused on having a different approach to energy efficiency and the way it is employed in industry. It considers the real case of Latin-America where normal temperature during day drastically changes from 0 to 25 degrees. Such temperature variation affects the indoor climate and its comfort. Therefore, one of the important tasks in construction of such regions is the correct choice of building materials for the enclosing structures. This article studies the typical construction materials in Colombia by analyzing its energy behavior. Temperature experiments are made for typical reinforced concrete and bricks. As a result of the experiment, it has been obtained that enclosing structures consisting of bicks are more stable to sudden changes in outside air temperature, suggesting it as the most appropriate solution for such climatic conditions. 10.18720/MCE.76.5 energy efficiency; sustainability; indoor climate; enclosing structure; building materials; temperature variation https://engstroy.spbstu.ru/article/2017.76.5/ 05.pdf
RAR RUS 58-66 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
 The deflection of spatial coatings with periodic structure The scheme of the statically determinate spatial truss is proposed. Rectangular truss has a vertical supports on the sides and loaded uniformly at the nodes by the vertical forces. The forces in the rods and supports are determined using cut nodes method. The dependence of the deflection midspan on a number of panels is obtained. A generalization of the particular solutions on an arbitrary number of panels obtained by the method of induction. All transformations and solutions are made in the system of computer mathematics Maple. The homogeneous linear recurrence equation satisfied by the members of the sequence of coefficients of the desired formula are derived and solved using the special operators of Maple. The formula for deflection is polynomial type in the number of panels. Plots of the deflection of the number of panels, height and the distribution ratio of cross-sectional areas of the rods are given. Expression of forces in the most stretched and compressed rods are obtained to perform durability and structural stability. The found solutions can be used by practical engineers to assess the performance of the designed construction and its optimization. 10.18720/MCE.76.6 spatial truss; deflection; Maple; analytical solution; coating https://engstroy.spbstu.ru/article/2017.76.6/ 06.pdf
RAR RUS 67-83 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 St. Petersburg State University of Architecture and Civil Engineering Ivanov Andrei andreyivanov4@gmail.com Saint-Petersburg State University of Architecture and Civil Engineering Rutman Yuriy 605fractal@mail.ru
2-nd Krasnoarmeiskaya St. 4, 190005 St. Petersburg, Russia
 Chernogorskiy Sergey Shvеtsov Konstantin shvetsov@inbox.ru Earthquake engineering optimization of structures by economic criterion The article deals with an economic optimization problem of structures designed on areas exposed to seismic hazard. Profit (cost-effectiveness) from building usage due its design life-cycle is considered as objective function in this optimization task. Building damage state evaluation procedure and repair cost estimation method are proposed in this study. A criterion and a variable parameter of an optimization problem is suggested here as well. There is an algorithm, which combines seismic computation results with economic performance indicators of damage state. The example of practical use of the algorithm is shown with the help of numerical simulations and economic parameters analysis for industrial building frame designed using different seismic retrofit schemes. Financial costs for each seismic retrofit scheme of a building are determined based on cost estimates, which allows to obtain the near-real estimation of seismic retrofit cost and financial losses from repair works of injured structural elements after various earthquakes. 10.18720/MCE.76.7 construction; civil engineering economic efficiency; capacity curve; financial curve; life cycle; performance-based earthquake engineering; seismic retrofit; damage state https://engstroy.spbstu.ru/article/2017.76.7/ 07.pdf
RAR RUS 84-97 P.M. Panchenko, Siberian State Automobile and Highway University Bobrova Tatyana bobrova.tv@gmail.com Siberian State Automobile and Highway University Panchenko Pavel pach121092@mail.ru Technical normalization of working processes in construction based on spatial-temporal modeling Application of spatial-time modeling to the rate setting of operational sequence is a practical way to reduce the labor required for this work without losing any accuracy and authenticity of the results was analyzed. The methodology provided the analytical algorithm of rate calculation in MS Excel is synchronized with the visualization of operational sequence in Cinema 4D. The sequence of visualization of rate setting is considered with the example of a common operational sequence for mounting reinforced-concrete ceiling slabs of a five-storey brick apartment building. A peculiarity of the framework shows in the variable parameters of production activities. During the animation the calculated standards of working time were corrected in order to provide a safe working environment. The application of visual modeling and computational and analytical method for designing the flowsheets of operational sequence proved the given method to be effective and appropriate for extensive use in rate setting for various sequences in construction with the base of improves software, such as Synchro Pro, SOMOKS.СМR and a number of other tools for automated scheduling of construction operational sequence. 10.18720/MCE.76.8 BIM+4D framework; rate setting; visualization; flowsheets of operational sequence; synchronization; ceiling slabs mounting https://engstroy.spbstu.ru/article/2017.76.8/ 08.pdf
RAR RUS 98-105 JSC “VNIIG im.B.E.Vedeneeva” Albert Yuliy AlbertYU@vniig.ru JSC “Transmost” Dolgaya Anzhelika anzhelika-dolgaya@yandex.ru “B.E. Vedeneev VNIIG”, JSC Ivanova Tatyana IvanovaTV@vniig.ru
21, Gzhatskaya St., Saint Petersburg, Russia, 195220
 Petersburg State Transport University Nesterova Olga neona975@yandex.ru Petersburg State Transport University Uzdin Alexander uzdin@mail.ru China University of Petroleum Guan Jhy 329953890@qq.com 0000-0002-2468-3382 “Vedeneev VNIIG”, JSC Ivashincov Dmitry vniig@vniig.ru
St. Petersburg, Russia
 JSC “B.E. Vedeneev VNIIG” Voronkov Oleg voronkovok@vniig.ru 7801674259 JSC “B.E. Vedeneev VNIIG” Shtilman Vladimir ShtilmanVB@vniig.ru JSC “VNIIG im.B.E.Vedeneeva” Shulman Sergey JSC “VNIIG im.B.E.Vedeneeva” Khrapkov Anatoliy khrapkovaa@vniig.ru Seismic input models for tuned mass damper designing The subject of investigations is seismic input models for tuned mass damper designing. Some features of simulating design accelerograms for estimating seismic stability of a structure with a mass damper are considered. The method of accelerogram modeling, proposed by Dolgaya A.A., approved by the Building Ministry of Russian Federation and included and in the corresponding Recommendations in 1996, is considered as the basic one. In accordance with this method, an accelerogram is modeled by a sum of three damped sinusoids. The sinusoid frequencies are chosen as dangerous for the structure, and the amplitudes and damping parameters are chosen so that the kinematic and energy characteristics of the model input correspond to the actual ones. The main feature of MD designing is the presence of close frequencies, and the choice of a dangerous frequency is not unambiguous. Features of choosing a dangerous frequency and the influence of various characteristics of real accelerograms on the generated synthetic accelerogram are considered. 10.18720/MCE.76.9 tuned mass damper; seismic input; mathematical modeling https://engstroy.spbstu.ru/article/2017.76.9/ 09.pdf
RAR RUS 106-114 M.Kh. Dulaty Taraz State University Yerzhanova Nurliza nurliza66@mail.ru The Kazakh scientific research institute of water economy Mussin Zhassulanbay musin_jasulan@mail.ru M.Kh. Dulaty Taraz State University Dzholdasov Saparbek Arnur_68@mail.ru M.Kh. Dulaty Taraz State University Altynbekova Aliya kleo-14@mail.ru Critical section and critical depth in open flows finding device There is theoretically shown that pressure is equal to half of flow depth at state of speed flow, i.e .It is equal to half of critical depth. Knowing it, authors offer a device that is designed to finding critical section and critical depth in open flows which are defined by consecutive measurements of dynamic pressure and depth of flow by means of the device in various cross sections and section findings where the dynamic pressure is equal to a half of flow depth, and depth is critical depth, i.e. equality is observed. As a result of the use of such a device increases information density due to the direct determination of the critical section and the critical depth of flow and increase ease of operation. 10.18720/MCE.76.10 flow rate; average speed; dynamic head; specific energy; spitzen scale; measuring needle; Pitot tube; stock; critical section; critical depth https://engstroy.spbstu.ru/article/2017.76.10/ 10.pdf
RAR RUS 115-129 Petersburg State Transport University Smirnov Vladimir svn193921@rambler.ru Petersburg State Transport University Shestakova Ekaterina ekaterinamost6@gmail.com Petersburg State Transport University Chizhov Sergei sergchizh@yandex.ru Petersburg State Transport University Antonyuk Anatoly aaa.12.03.1992@mail.ru Petersburg State Transport University Lediaev Alexander Tunnels@pgups.ru Petersburg State Transport University Indeykin Andrey andrey.indeykin@mail.ru Saint-Petersburg State University of Architecture and Civil Engineering Evtukov Sergey s.a.evt@mail.ru Dynamic interaction of high-speed trains with span structures and flexible support To ensure reliable and safe operation of the bridge structure throughout the life cycle, it is necessary to analyze and take into account many important factors, including the interaction of the main load-bearing structures. The presented work has new theoretical information, which gives the main provisions in the field of design of artificial structures for high-speed railroads. To analyze the system of a multi-span split bridge design using flexible intermediate supports of a flyover type, the Newton method (algorithm) is used. The basic data on the interaction of span structures and the design of flexible supports that are not taken into account in the design of facilities are not specified or regulated in the basic normative space, either by domestic JV standards or by foreign European EN standards, including national normative bases of the CIS countries. Harmonic analysis of the recording of the interaction of high-speed rolling stock and the joint operation of the main bridge structures of man-made structures is necessary for the design of high-speed railroads of transport infrastructure, especially in conditions of high-speed rolling stock. The article proposes a methodology for taking into account the interaction of the elements of the "bridge-train" system and determines the directions for further research to take into account the joint work and optimization of the basic designs of modern bridges and rolling stock in the region of high train speeds. 10.18720/MCE.76.11 railway bridge; train; supports; highspeed railway mainline (HSRM) https://engstroy.spbstu.ru/article/2017.76.11/ 11.pdf
RAR RUS 130-139 Perm National Research Polytechnic University; Perm State Agro-Technological University named after academician D.N. Prianishnikov Tretiakova Olga olga_wsw@mail.ru
Perm, Russia
 Normal stresses of frost heaving as function of excess moisture Tangential and normal stresses are arises foundation area from the frost heave process. Currently known is the analysis of the tangential stresses based on adfreezing of the frozen soil to the lateral surface of foundation. However, the differences in values of normal stresses may be due to the fact that no single approach to normal stress evaluation has been developed yet. The purpose of our research is to work out the analysis method of the frost heave normal stresses. The stresses appear perpendicular to the surfaces of structures not allowing increase in the soil volume when cooled and frozen. Based on the author's research and other investigators' experience, analytical dependences for normal stresses of soil frost heaving were obtained. The stresses were calculated as a function of excess moisture, which volume exceeds the soil interstitial volume under freezing. The results obtained took into account such factors causing heaving process as ice formation during water freezing, accumulation of ice resulting from sucking up water and influence of unfrozen water. The proposed formulas allow for calculation of stresses in any kind soil. 10.18720/MCE.76.12 frost heave; water sucking up; normal stress; soil interstices; soil interstitial volume; icecement; disjoining action of water films https://engstroy.spbstu.ru/article/2017.76.12/ 12.pdf
RAR RUS 140-155 Riga Technical University Grasmanis Dzintars dzintars.grasmanis@gmail.com Bryden Wood Technology Ltd Sovetnikov Daniil sovetnikov.daniil@gmail.com
London, UK
 Peter the Great Saint Petersburg Polytechnic University Baranova Daria baranova-d@mail.ru
Polytechnicheskay, 29
 Energy performance of domestic hot water systems Residential sector consumes 70 % of the district heat. The domestic hot water system consumes 27 % of the total thermal energy consumption in these buildings in Riga. According to the mandate of the European Committee for Standardization (CEN) European standards for assessment of the energy performance of buildings have been developed. CEN standards give different methods and default values for calculations and procedures for energy performance assessment. Taking into account national or regional regulations and climatic conditions for all CEN standards application a national annex is required. CEN standards adapted to the status of Latvian standards (LVS) are not complemented with national annexes that are required for high grade use of standards at the national level. The target of this paper is assessment the suitability of CEN standards for the calculation of energy performance of the domestic hot water systems and search for the optimal solutions (methods and default values) for Latvian conditions. In this study there is performed assessment of the consumption of the heat energy in the apartment buildings for heating and hot water system, including: 1) assessment of the DHW volume and necessary energy amount; 2) assessment of the heat losses in the hot water distribution system during heating and non-heating seasons; 3) assessment of the auxiliary energy of the DHW system. The results of this paper give possible evaluation of economic feasibility and energy impact for improvements of domestic hot water systems. The method corresponding to CEN standards suitable for Latvian conditions is proposed. 10.18720/MCE.76.13 domestic hot water; energy performance; apartment building; water consumption; calculation https://engstroy.spbstu.ru/article/2017.76.13/ 13.pdf
RAR RUS 156-168 56056531000 0000-0002-9133-8546 Don State Technical University Chepurnenko Anton anton_chepurnenk@mail.ru
Rostov-on-Don, Russia
 Stress-strain state of three-layered shallow shells under conditions of nonlinear creep The resolving equations were obtained and a calculation technique was developed with allowance for the nonlinear creep of three-layer plates and shallow shells with a lightweight filler. The problem was reduced to a system of three differential equations with respect to the stress function, displacement and deflection function. An example is given of calculating a rectangular planar shell in the form of an elliptical paraboloid. The solution was performed numerically by the finite difference method in combination with the Euler method for determining creep strains. The linear Maxwell-Thompson equation and the Maxwell-Gurevich nonlinear equation were used as the creep law. There were no significant discrepancies between the results obtained on the basis of the linear and nonlinear theory. It was established that, as the curvature of the shell increases, the creep of the aggregate has a lesser effect on the deflection value. It was revealed that for shells of greater curvature with constant displacements a redistribution of stresses and internal forces occurs. The bending and twisting moments decrease, and the longitudinal and shearing forces increase. In the aggregate, the tangential stresses relax, while in the sheaths the normal and tangential stresses increase. 10.18720/MCE.76.14 nonlinear creep; three-layer constructions; plates; shells; numerical methods https://engstroy.spbstu.ru/article/2017.76.14/ 14.pdf
RAR RUS 169-180 Irkutsk National Research Technical University Kuz'min Mikhail Mike12008@yandex.ru Irkutsk National Research Technical University Larionov Leonid larionov59@rambler.ru Irkutsk National Research Technical University Kondratiev Victor kvv@istu.edu Irkutsk National Research Technical University Grigoriev Vyacheslav grigorievvg@istu.edu Irkutsk National Research Technical University Kuz'mina Alina zhuravlyova-alina@yandex.ru Irkutsk National Research Technical University Kuz'mina Marina kuzmina.my@yandex.ru Burnt rock of the coal deposits in the concrete products manufacturing The paper presents the results of the comprehensive study of the composition, properties and structure of the burnt rock found at the mining dumps of Cheremkhovo coal deposit (Irkutsk region, Russia). In the course of laboratory research, which included optical crystallography, there have been established the reasons accounting for the extent of burnt rock activity when in contact with cement during the cement stone formation. The benefit of the burnt rock as an active mineral additive, compared to the fly ash used by the cement plants, was confirmed as well. The optimal ratio of cement and burnt rock in concrete mixtures was determined experimentally. Likewise, the most effective method of using burnt rock as an active mineral additive was developed as the result of semi-industrial tests when the sample was subjected to the pressing and steam treatment. Finally, the impact such an additive can have on the production cost have been calculated. 10.18720/MCE.76.15 burnt rock; slagheaps ash; mine dumps; coal deposits; active mineral addition; concrete; cement; cement stone; fly ash https://engstroy.spbstu.ru/article/2017.76.15/ 15.pdf
RAR RUS 181-192 Bryansk State University of Engineering and Technology Serpik Igor iserpik@online.debryansk.ru 57191530761 0000-0002-4765-5819 Moscow State University of Civil Engineering (National Research University) Alekseytsev Anatoly aalexw@mail.ru
Moscow, Russia
 Bryansk State University of Engineering and Technology Balabin Pavel pavelbalabin90@yandex.ru Bryansk State University of Engineering and Technology Kurchenko Natalia inserpik@gmail.com Flat rod systems: optimization with overall stability control An algorithm for discrete optimization of steel flat rod systems was developed on the basis of an evolutionary search. The task is to minimize the weight of the bars via taking into account constraints on stresses, displacements, and overall stability. The cross-sectional dimensions of the bars and the coordinates of their node connections were varied. Buckling is taken into account when stability is lost both in the object plane and out of the plane. Analysis of deformations of the considered structure variants was performed via the displacement-based finite element method. An iterative procedure for solving the task was formulated by using an auxiliary elite population, combined approaches to selection and mutation, and single-point crossover. The primary feature of the proposed computing scheme is simplified structure stability verification by determining stress-strain conditions with a tangent stiffness matrix and the additional self-balanced system of small fictitious forces. Assessment as to how constraint on stability was met was performed based on the results of the considered convergence of the internal iteration cycle used for analyzing load-carrying system behavior by taking into account the influence of longitudinal forces on the bars while bending. It was calculated that it is sufficient to perform only 3–5 iterations of this procedure to verify structure stability. Efficiency of the proposed algorithm is illustrated via the example of optimization of bar system with two supports and a frame with a girder truss. 10.18720/MCE.76.16 steel structures; flat rod systems; optimization; genetic algorithms; finite element method; strength; stiffness; overall stability https://engstroy.spbstu.ru/article/2017.76.16/ 16.pdf
RAR RUS 193-200 Peter the Great St. Petersburg Polytechnic University Aleksandra Bushmanova nicealexa@mail.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 7801686579 0000-0001-7011-8213 Peter the Great Saint Petersburg Polytechnic University Barabanschikov Yuri ugb@mail.ru
Polytechnicheskay, 29
 Peter the Great St. Petersburg Polytechnic University Semenov Kirill kvsemenov@bk.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great Saint Petersburg Polytechnic University Struchkova Ayyyna ayyyna_struchkova93@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Manovitsky Sergey sergeimanovitsky@mail.ru
Polytechnicheskay, 29
 Thermal cracking resistance in massive foundation slabs in the building period The article deals with the research of the thermal cracking resistance of massive concrete and reinforced foundation slabs of buildings and structures in the building period. The article examines the results of the analysis of the thermal stress state of a massive foundation slab with a fixed thickness of thermal insulation as well as the results of changing the minimum thickness of the insulation on a surface, providing the cracking resistance of the structures on different plate heights, with and without taking into account the hardening temperature influence on the concrete modulus of the deformation. The article authors determined that the solution of the problem of definition the thermal stress state of the massive foundation slab in the building period without the hardening temperature influence on the modulus of deformation may cause a significant distortion of the real diagram of the thermal stresses and elongation deformations in the structures body. It was indicated that the calculation error essentially depends on the height of the foundation slab. Additionally it was established that in case the slab height exceeds 1.25 m the problem should be solved in a strict setting, which would allow to minimize the insulation layer. 10.18720/MCE.76.17 modulus of deformation; massive concrete and reinforced concrete structures; thermal stressed state; thermal cracking resistance; hardening temperature https://engstroy.spbstu.ru/article/2017.76.17/ 17.pdf
RAR RUS 201-213 Peter the Great St. Petersburg Polytechnic University Chechevichkin Alexey 01@6400840.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 St. Petersburg Institute of Technology (Technical University) Samonin Vyacheslav samonin@mail.admiral.ru
St. Petersburg, Russia
 Peter the Great Saint Petersburg Polytechnic University Grekov Mikhail disgpu@spbstu.ru
Polytechnicheskay, 29
 Purification of hot water by zeolite modified with manganese dioxide A new material is proposed for complex purification of hot water from iron and hydrogen sulphide – natural zeolite modified by manganese dioxide. It has been shown experimentally that this filtering material has high efficiency of water purification from iron and hydrogen sulphide, low mechanical degradability during operation, as well as low water consumption for washing during regeneration of the filtration media. The complex cleaning of hot water is proposed to carry out by means of two stages: the first – filtration cleaning from insoluble iron compounds with linear water velocity of 10–12 m/h, and the second – oxidation-catalytic purification from hydrogen-sulphide with velocity 1–2 m/h. Regeneration of a filtering material based on a manganese-modified natural zeolite can be carried out by back washing and chemical treatment with an oxidizer solution. 10.18720/MCE.76.18 hot water; natural zeolite; manganese dioxide; hydrogen sulfide; buildings; constructions; energy efficiency https://engstroy.spbstu.ru/article/2017.76.18/ 18.pdf
RAR RUS 214-224 Peter the Great St. Petersburg Polytechnic University Loktionova Elena elena.lokt@yandex.ru Miftakhova Dinara Fluid filtration in the clogged pressure pipelines Reducing of the hydraulic characteristics of pressure pipelines in the course of their operation due to corrosion, clogging and other causes leads to an increasing of operating costs. The existing information on the change in the capacity of pipelines under the influence of certain factors is currently insufficient. The aim of the work is to determine the influence of the clogging degree of the pipeline on its throughput. This paper describes the results of hydraulic tests of a pressure pipeline with clogging of two types: expanded clay gravel and medium-grained sand. The discharge coefficient and resistance coefficient of the "clean" pipeline and the pipeline with clogging were determined during the experiments. The dependence of the relative flow rate of the pipeline on the clogging degree of the pipe was obtained. Influence of the type of filler on the throughput of the pipe was shown. An insignificant difference in the values of the relative flow rate for both fillers at low degrees of clogging of the pipeline was established. The transition from the discharge and resistance coefficients to filtration coefficients of pipeline was proposed. The values of the filtration coefficients of pipe from the experiments on the flow measurement were found. The ratio between the discharge coefficient and the filtration coefficient of pipeline was set. The values of filtration coefficients of pipe for emptying the pressure tank were found. The coincidence of the values of the filtration coefficients by the two methods was obtained. 10.18720/MCE.76.19 throughput of pipeline; discharge coefficient; resistance coefficient; clogged pipelines; degree of clogging; relative flow rate; filtration coefficient of pipeline https://engstroy.spbstu.ru/article/2017.76.19/ 19.pdf
RAR RUS 225-240 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
 Admiral Makarov State University of Maritime and Inland Shipping Knysh Tatiana KnyshTP@gumrf.ru Stress-strain state of clamped rectangular Reissner plates The paper focuses on obtaining numerical results for a rectangular Reissner plate with clamped contour under the influence of a uniform load using the iteration superposition method of four types of trigonometric series (correcting functions). The initial function of bendings is selected as a quartic polynomial which turns into zero on the contour and is a specific solution to the main bending equation. Discrepancies in rotation angles from the initial polynomial are eliminated in turn on parallel edges by pairs of correcting functions of bendings and stresses which cause angular discrepancies themselves. During an infinite process of the superposition of these pairs, all discrepancies tend to zero, which gives a precise solution at the limit. The paper presents results of bending computations, bending moments, and shearing forces for square plates different thickness. The obtained results are compared with the results of other authors, as well as with Kirchhoff theory. It is shown that with the relative thicknesses less than 1/20, the results gained with both theories are almost the same. 10.18720/MCE.76.20 plate Reissner; clamped contour; bending; Fourier series; computations https://engstroy.spbstu.ru/article/2017.76.20/ 20.pdf
RAR RUS 241-254 Peter the Great Saint Petersburg Polytechnic University Il'ina Khristina Ilin220396@yandex.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Gavrilova Nadezhda spbstung@yandex.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Bondarenko Ekaterina katyushka-bond@mail.ru
Polytechnicheskay, 29
 Andrianova Maria Peter the Great Saint Petersburg Polytechnic University Chusov Alexander chusov17@mail.ru
Polytechnicheskay, 29
 Express-techniques in study of polluted suburban streams Water samples from streams in suburban region of new builds were analyzed in order to suggest methods and parameters for pollution monitoring. Concentrations of total nitrogen (TN) varied from 0.6 to 9.0 mg/L, ammonium – from 0 to 6.8 mg/L, total organic carbon (TOC) from 8.3 to 21.1 mg/L. Electric conductivity (EC) varied from 80 to 640 mkSm/cm, optical density at 254 nm – from 0.41 to 1.07. Increased concentrations of TN and ammonium at several sampling sites confirmed wastewater discharge from dwelling area. Polluted waters also showed higher values of electric conductivity and molar fractions for sodium and chloride ions, lower values of optical density (in range 230 – 420 nm) and TOC. Fluorescence intensity (I) was measured at excitation wavelength 230 and 270 nm, emission wavelengths 300-350 nm (protein-like fluorescence, present in wastewaters), 420 nm (humic-like fluorescence, present in natural and waste waters). Character of correlation between fluorescence intensity and TN (marker of pollution) and TOC depended on wavelengths, fluorescence signal correction and dilution of sample. Only I at 230 nm excitation and 350 nm emission for 10-fold diluted sample of water could be recommended for water monitoring. EC can be used as additional parameter in studied streams. 10.18720/MCE.76.21 environmental monitoring; water pollution; wastewater; surface water; fluorescence; conductivity https://engstroy.spbstu.ru/article/2017.76.21/ 21.pdf
RAR RUS 255-265 Peter the Great Saint Petersburg Polytechnic University Srungeri Sanjeev Gautham sanjeevgautham18@gmail.com
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Alekseev Nikolai nikolas.alexeeff@yandex.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Kovalenko Ilya ilyako27@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Stolyarov Oleg oleg.stolyarov@rambler.ru
Polytechnicheskay, 29
 Creep behavior of geosynthetics by temperature accelerated testing Predicting the creep behaviour of geosynthetics is very important for determining the design life of geosynthetic based structures. In this paper, geogrids and geotextiles made of two major types of synthetic polymer namely, polyester and polypropylene were investigated for accelerated creep test. In short-term measurements, creep was accelerated by temperature in equal steps. As a result of the analysis, predicted creep curves for up to 30 years of design life were obtained by the stepped isothermal method. The predicted creep deformation for a period of 30 years has been analyzed. The geogrid samples made of polyester showed better creep resistance compared to polypropylene geogrids. Geosynthetic materials made of polyester are more suitable for various loaded applications as a reinforcement function. 10.18720/MCE.76.22 geosynthetics; viscoelastic properties; creep; step isothermal method; prediction https://engstroy.spbstu.ru/article/2017.76.22/ 22.pdf
RAR RUS 266-278 Petersburg State Transport University Indeykin Andrey andrey.indeykin@mail.ru Petersburg State Transport University Chizhov Sergei sergchizh@yandex.ru Petersburg State Transport University Shestakova Ekaterina ekaterinamost6@gmail.com Petersburg State Transport University Antonyuk Anatoly aaa.12.03.1992@mail.ru Saint-Petersburg State University of Architecture and Civil Engineering Evtukov Sergey s.a.evt@mail.ru Research and Design Institute "Lenmetrogiprotrans" Kulagin Nikolay lmgt@lenmetro.ru Saint-Petersburg State University of Architecture and Civil Engineering Karpov Vladimir vvkarpov@lan.spbgasu.ru Petersburg State Transport University Golitsynsky Dmitriy pgupstm@yandex.ru Dynamic stability of the lattice truss of the bridge taking into account local oscillations The carrying capacity of the railway and the service life of artificial structures primarily depend on the operational category of the structure and the dynamic state: dynamic stability, the condition that dangerous vibrations do not appear, and the dangerous resonance of the amplitude of the oscillations. Studies on the dynamics of railway bridges have gained relevance in connection with the new construction and reconstruction of bridges of high-speed and high-speed railroads. When choosing the restoration measures for the reconstruction of existing railway lines or when designing and building new structures, taking into account the current high operational requirements, a thorough evaluation of the efficiency and reliability of the span structures is necessary, taking into account the type of construction and analysis of the dynamic impact. In the article the analysis of factors is produced influencing on the possible loss of dynamic stability of bars of the latticed truss under act of kinematics indignations of ends of bar at the general vibrations of flight structure caused by dynamic factors accompanying moving of the temporal loading on a bridge. A novelty is made by the account of mutually influencing general and local vibrations of flight structure at the estimation of dynamic stability of the cored latticed truss. The spectrum of parametric vibrations of bars of the latticed truss is investigational in the conditions of remoteness from the areas of dynamic instability. The method of decomposition of decision of differential equalizations of vibrations is applied on the Bessel function with a whole icon. Practical limitation of spectrum of frequencies is got near-by the value of bearing frequency to equal frequency of free vibrations taking into account influence of central forces and also relatively small influence of parametric vibrations in areas remote from living parametric resonance. Taking into account the dynamic stability presented by the authors, it is possible to expand the possibilities of using the existing norms and update them for dynamic calculations of railway metal bridges with lattice trusses, as well as to take into account the main factors that influence the occurrence of additional dynamic influences. 10.18720/MCE.76.23 bar element; building structure; kinematic perturbation; parametric resonance; decomposition model; excitation coefficient; influence line https://engstroy.spbstu.ru/article/2017.76.23/ 23.pdf
RAR RUS 279-297 Petersburg State Transport University Benin Andrey benin.andrey@mail.ru Dresden University of Technology Semenov Artem Semenov.Artem@googlemail.com Peter the Great Saint Petersburg Polytechnic University Semenov Sergey ssgrus@gmail.com
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Beliaev Mikhail belyaev-m-o@yandex.ru
Polytechnicheskay, 29
 Modestov Victor modestov@compmechlab.com Methods of identification of concrete elastic-plastic-damage models The methodology for identification of mechanical characteristics of the nonlinear material model for concrete, taking into account the elastic-plastic deformation and the damage accumulation under monotonous and cyclic loading, is proposed. The using such improved models of concrete deformation is actual for carrying out finite-element computations of the most important elements of unique and responsible buildings and structures. The proposed methodology is verified for three different types of concrete (B45, B25, B5), including also their preliminary heat treatment at 200 °C, 300 °C, 400 °C and 600 °C. The experiments were carried out on standard specimens of cubic and prismatic form under compression, as well as on dog-bone-shaped specimens under tension. Elasticity and plasticity moduli, ultimate strengths in compression and tension, damage evolutions during deformation process were obtained in tests. Particular attention has been paid to the search for reliable and effective methods for determining damage based on cyclic deformation curves in the pre-peak and after-peak loading regimes. Comparison of simulation results with experimental data under monotonic and cyclic compression demonstrates a good agreement for regular and for overheated concrete. 10.18720/MCE.76.24 concrete; parameter identification; elasticity; plasticity; damage; experiment; finiteelement simulation https://engstroy.spbstu.ru/article/2017.76.24/ 24.pdf