75504 2712-8172 Magazine of Civil Engineering 1 45 2014 1-120
CHR RUS 5-5 0000-0003-2533-9732 National Research Moscow State Civil Engineering University Samarin Oleg samarin-oleg@mail.ru Outcomes of the 5th International Scientific and Technical Forum "Theoretical Foundations of Heat, Gas Supply and Ventilation" The information of the 5th Forum "Theoretical foundations of HVAC" is presented. The paper states the structure of the conference and the subject of the most important presentations; notes the role of the forum in the development of the HVAC science. 10.5862/MCE.45.1 forum heat gas supply and ventilation energy saving young researchers' competition https://engstroy.spbstu.ru/article/2014.45.1/ 01.pdf
RAR RUS 6-11 LLC PRAYM KAD Ievzerov Isaak ide@lira.com.ua The Stability Problems for Bars and Plates The stability problems for bars and plates are considered. Variation formulations are used for the stability problems. The positive definiteness of the potential energy functional is studied. The transition from the three-dimensional stability problem to the corresponding problems for bars and plates is executed. Concepts of displacements through the section of bar and plate thickness are used for geometrically nonlinear problems. These concepts are derived from the assumptions of the vanishing of the strain through the cross-section plane of the bar or the thickness of the plate. The second variations of non-linear deformations are calculated. The integration through the cross-section of the bar and plate thickness was made, using known formulas for the efforts and the equilibrium equation. The stability functionals for bars and plates are obtained. Comparing to the results known before is conducted. A solution to the test problem for the centrally compressed cantilever beam with a cross section of Pi, which was modeled by plates, is given. 10.5862/MCE.45.2 stability problems bars and plates variation formulations https://engstroy.spbstu.ru/article/2014.45.2/ 02.pdf
RAR RUS 12-22 JSC "ATOMPROEKT" Chernukha Nikita chernukha.n@mail.ru
82A, Savushkina St., St. Petersburg, 197183, Russia
 Structural Analysis of Buildings at Explosive Actions in SCAD This article deals with the methods of structural analysis of buildings and structures at explosive actions. In introduction, there is a review of types of explosions and the features of their action on structures. In the theoretical part of the study the main issue was to present different methods of structural analysis of buildings at explosions. Determination of wave parameters and process of wave diffraction are presented. Impulse loading of building structures in SCAD is described. The article also shows how module «Direct integration of motion equations» in SCAD can be used for solving problems of explosion dynamics. In the empirical part of the study the main concern was to compare stress-strain condition of building structures at explosions, using different methods of structural analysis. Automatic analysis was performed in SCAD, which implements finite element method (FEM). The results of the study demonstrate the advantages and disadvantages of described methods, as well as the functional abilities of SCAD, when solving the problems of explosion dynamics. 10.5862/MCE.45.3 types of explosions structural dynamics quasi-static method impulse action direct integration wave diffraction FEM SCAD https://engstroy.spbstu.ru/article/2014.45.3/ 03.pdf
RAR RUS 23-40 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
 6701751705 0000-0002-7889-1996 Peter the Great Saint Petersburg Polytechnic University Boris Melnikov kafedra@ksm.spbstu.ru
Polytechnicheskay, 29
 The Simulation of Bond Fracture between Reinforcing Bars and concrete. Part 2. Models without taking the Bond Discontinuity into account In order to improve the accuracy of the strength assessment of operating reinforced concrete structures, it is rational to use the model with a discrete location of reinforcing bars with the actual characteristics of adhesion to concrete reinforcement. The problem of pulling the reinforcing bar from the concrete block is relevant for the practice, as it represents the most widespread method of experimental evaluation of characteristics of reinforced-concrete bond behavior. Fracture of bond during the pulling of rebar from concrete is a complex multistep process, characterized with the presence of inhomogeneous and inelastic deformation, the rupture of adhesive bonds, the initiation and propagation of cracks of different shape and orientation, the presence of contact and tribological phenomena. The nonlinear finite-element solutions of the pulling the reinforcing bar from the concrete block problem have been obtained by using various models of bond behavior and concrete cracking. The comparison between the obtained numerical results and experimental data has been presented and discussed. The first part of the article is devoted to the models taking into account the discontinuity of the connection. The second part is concerned with the models without explicitly taking into account discontinuities. 10.5862/MCE.45.4 reinforced-concrete bond degradation mathematical models finite element simulation pullout test cracking damage failure https://engstroy.spbstu.ru/article/2014.45.4/ 04.pdf
RAR RUS 41-52 Ogarev Mordovia State University Selyaev Vladimir mossrorm@yandex.ru Ogarev Mordovia State University Neverov Vyacheslav ua4uu@mail.ru Ogarev Mordovia State University Selyaev Pavel ntorm80@mail.ru Ogarev Mordovia State University Sorokin Evgeniy evssar@mail.ru Ogarev Mordovia State University Yudina Olga zaichyshka90@mail.ru Predicting the Durability of Concrete Structures, including Sulfate Corrosion of Concrete Multiple data on the examination of concrete structures indicate that under the influence of various factors (temperature, humidity, gaseous medium) carrying capacity and rigidity during operation are reduced. The problems of assessing the residual life and durability of concrete structures are considered in the article. Experimental studies on the interaction of the concrete samples with aggressive sulfate medium are conducted. By measuring the micro-hardness, isochrones of degradations, enabling experiments to determine the rate of advance of the destruction front deep into the product; intensity changes in the durability properties of the material surface and other features which characterize the degradation process were obtained. The article investigates the mechanisms of corrosion processes in reinforced concrete in condition of sulfate corrosion. The paper proposes the calculation model and the method that predict the durability of concrete structures. 10.5862/MCE.45.5 durability sulfate corrosion of concrete destruction of cement degradation function https://engstroy.spbstu.ru/article/2014.45.5/ 05.pdf
RAR RUS 53-58 Technical University in Košice Al Ali Mohamad mohamad.alali@tuke.sk Technical University in Košice Tomko Michal michal.tomko@tuke.sk Analysis of the Resistance of Thin-Walled Cold-Formed Compressed Steel Members with Closed Cross-sections. Part 2 Part 1 of the paper presents fundamental information about the experimental and theoretical research oriented to determine the resistance of thin-walled cold-formed compressed steel members with closed cross-sections, [1]. The investigated members were made from homogeneous material. The theoretical analysis was oriented to determine the resistance of mentioned members according to European and Slovak standards, while the experimental investigation was to verify the theoretical results and to investigate the behavior of the above-mentioned members during the loading process, [2]. Part 2 is focused on the numerical analysis of the achieved results, as well as on 3D modeling and simulation of the experimental tests. 10.5862/MCE.45.6 thin-walled web cold-formed profiles initial imperfections https://engstroy.spbstu.ru/article/2014.45.6/ 06.pdf
RAR RUS 59-70 Peter the Great St. Petersburg Polytechnic University Eigenson Sergei sopromat.eigenson@yandex.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great St. Petersburg Polytechnic University Korikhin Nikolai Kor440@mail333.com
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Peter the Great St. Petersburg Polytechnic University Golovin Aleksandr gai422@mail.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 Experimental Investigation considering the Stressed State of some Essential Constructions of Large Hydropower Buildings The article is concerned with the experimental investigation considering the stressed state of essential constructions of hydropower buildings: the pressure pipeline “fork” of large hydropower unit and elastically restrained heavy arches weakened with round holes. The precise knowledge of the stress-strain state (SSS) of the structure during the design phase is essential to the construction’s durability. Analytical methods of calculations, including numerical ones (e.g, finite element method - FEM), are being developed and improved. Experimental methods for studying the stress-strain state of structures on models complement the analytical calculations and combine with them effectively. The research was carried out by the method of photoelasticity "freezing" of deformations using the ability of epoxide polymers to maintain the constant optical anisotropy, caused with loading of the model, after unloading. The results allowed to specify the stress distribution in significant critical structural sections, to evaluate the reliability of estimates of stress concentrations by the holes in arches, fulfilled by finite-element method. 10.5862/MCE.45.7 fork of pressure pipeline arch with holes photoelasticity method modeling of deformation “freezing” stressed state stress concentration https://engstroy.spbstu.ru/article/2014.45.7/ 07.pdf
RAR RUS 71-79 Peter the Great Saint Petersburg Polytechnic University Liang Li hitliliang@gmail.com
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Shkhinek Karl karl-1303@mail.ru
Polytechnicheskay, 29
 Dynamic Interaction between Ice and Inclined Structure Ice action on sloping structures is examined in this paper. This problem was considered many times before but, generally, only quasi static and 2D solutions were taken into consideration. In particular, these assumptions are proposed in widely used Croasdale’s solution for sloping structures. Some improvements of the 2D solution suggested by Croasdale cannot take into account all peculiarities of the 3D phenomenon. The numerical investigation of the problem based on the program ANSYS is used in this paper. The following topics are considered: a) what is the difference of maximum ice loads in 3D and 2D solutions; b) how does dynamicity of the ice/structure interaction process influence on the loads; c) how does the ice load depend on the main factors – ice strength, ice thickness and the structural slope angle. 10.5862/MCE.45.8 structure width ice load ice pile sloping hydraulic structure ANSYS https://engstroy.spbstu.ru/article/2014.45.8/ 08.pdf
RAR RUS 80-89 55586710000 0000-0002-6498-5043 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Sultanov Takhirjon tz-sultanov@mail.ru
Tashkent, Republic of Uzbekistan
 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Khodzhaev Dadakhan khodzhaevda@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
 The Assessment of Dynamic Behavior of Heterogeneous Systems taking into account Non-linear Viscoelastic Properties of Soil The paper reviews in detail the modern state of the calculation problem for non-linear rheological properties of soil in making an assessment of the stress-strain state of ground structures. The mathematical statement, methods and algorithms to assess the dynamic behavior of earth structures taking into account heterogeneous specific features of a structure, linear, non-linear-elastic, non-linear-viscoelastic properties of soil under different dynamic effects are given. The result of a dynamic calculation is the study of unsteady forced oscillations of a number of earth dams taking into consideration non-linear viscoelastic properties of soil and heterogeneous specific features of a structure. The obtained results permit us to reveal several mechanical effects of theoretical and practical value. It was revealed that under high-frequency intensive effect the character of structures oscillations having low-frequency specter has three pronounced stages: an initial one that is characterized with low amplitudes, transitional one, when the swinging of structure occurs; and the stage of free oscillation with realized amplitude and frequency of own vibrations. In spite of the high intensity of high-frequency effect, which causes large stresses in the body of the discussed dams, the calculation of non-linear strain in the material does not greatly distort the pattern of linearly elastic design. 10.5862/MCE.45.9 earth dam soil rheology heterogeneity non-linearity viscoelasticity accelerogram hydro-static pressure kinematic effect https://engstroy.spbstu.ru/article/2014.45.9/ 09.pdf
RAR RUS 90-100 Vologda State University Utkin Vladimir UtkinVoGTU@mail.ru
Vologda, Russia
 The Calculation of Foundation Bed Reliability by Bearing Capacity (Shift) during Operation New methods of foundation bed reliability calculations by the criterion of the shift when the base is under the influence of horizontal (shifting) forces are made. Initial statistical information is limited. Random variables in the calculation model are described by distribution functions of possibility (from the theory of possibility), distribution functions received from Chebyshev's inequality; combination of functions. The size of controlled parameters measurements (statistical information) for reliability calculations is small in practice and sometimes it doesn't allow to carry out their statistical analysis for the use of probabilistic and statistical methods of reliability calculations of the foundation beds. The considerable decrease in reliability of the foundation bed causes soil moistening as, for example, it is now in the Far East the Russian Federation. When there is a lack of time for collecting of information for an assessment of buildings and constructions safety, the developed techniques can be used. In this work such situation is illustrated by the example. 10.5862/MCE.45.10 foundation bed reliability failure limited information possibility distribution function probability risk https://engstroy.spbstu.ru/article/2014.45.10/ 10.pdf