75504 2712-8172 9 44 2013 1-104

RAR RUS 4-9 Saint-Petersburg State University of Architecture and Civil Engineering Meleshko Vladimir vl-meleshko@yandex.ru Saint-Petersburg State University of Architecture and Civil Engineering Khertek Urana urana_hertek@mail.ru Krylov State Research Centre Rogovoy Yuriy spbrog@mail.ru Determination of aerodynamic parameters of "Olympic Park" railway station canopy. Physical and numerical experiments This article describes the results of experimental and numerical simulation of flow layout sheds station building "Olympic Park". The experimental results of the station model are presented. The station model is analyzed using ANSYS CFX to model the air flow and to determine the aerodynamic parameters. Navier – Stokes equations were solved using the SST turbulence model. Furthermore, aerodynamic analysis was performed using the detached eddy DES method. A comparison of the experimental values of the aerodynamic parameters of the models with results numerical simulation obtained in ANSYS CFX was in satisfactory agreement. 10.5862/MCE.44.1 station canopy wind tunnel vortex shedding aerodynamic parameters turbulence model https://engstroy.spbstu.ru/article/2013.44.1/ 01.pdf

RAR RUS 10-22 Perm National Research Polytechnic University Vorobev Aleksandr km02@yandex.ru Perm National Research Polytechnic University Kashevarova Galina ggkash@mail.ru Adaptive models of short-term surface subsidence prediction and detection of the most hazardous building position in displacement trough Surface subsidence prediction is needed to evaluate mechanical safety and make it possible to provide further operation of buildings located in subsided area. The process of surface subsidence is studied by means of adaptive model of short-term time sequence prediction. The aim of adaptive forecast method is to build self-adjusting mathematical models that can show time-varying conditions and give accurate evaluation of given time sequence elements. Such models are primarily used for short-term forecasting. An appropriate forecast model is chosen according to the comparison of forecast values with the full-scale data of control benchmark subsidence. The results of modelling analysis show that Holt’s model forecasting has the nearest equivalent values to real subsidence value. As a result of numerical modelling the worst position of a five-storey panel building in displacement trough and stress-strain behavior of a standard panel building are defined. Numerical modelling results are proved by survey data. 10.5862/MCE.44.2 adaptive prediction model subsided area surface subsidence displacement trough finite-element technique https://engstroy.spbstu.ru/article/2013.44.2/ 02.pdf

RAR RUS 23-29 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

Optimization of frame structures with possibility оf emergency actions The purpose of the research was to develop the method for optimizing the plane steel frames on the discrete sets of parameters with possibility of emergency actions. The search for the solution was carried out using genetic algorithm. The computational scheme included the following main steps: finding the optimal embodiment taking into account the conditions of normal use of the building; performing calculations of this object in the static and dynamic formulations in the assumption of local damages with the estimation of dynamic coefficient for each considered emergency action; optimal design of the construction with the calculations of the damaged rod systems in a quasi-static formulation using the obtained dynamic coefficients. The analysis of the transient dynamics was executed in the physically and geometrically nonlinear formulation using the associated flow rule. Calculation in the static formulation was implemented within the framework of the deformation plasticity theory with the account for rods of the influence of normal forces on bending. The example of optimal synthesis of the three-span plane frame with the fast damages of any of its column supports was considered. The proposed methodology can be recommended for use in the design of buildings and structures with high level of safety. 10.5862/MCE.44.3 emergency actions genetic algorithms survivability of structures parameter optimization steel frames https://engstroy.spbstu.ru/article/2013.44.3/ 03.pdf

RAR RUS 30-41 Nizhny Novgorod State Technical University n.a. R.Е. Alekseev Sergeyev Oleg nnsoa@rambler.ru

Nizhny Novgorod, Russia

Kiselev Vladimir kis_vg@mail.ru Nizhny Novgorod State Technical University n.a. R.Е. Alekseev Sergeyeva Svetlana nnsveta@rambler.ru

Nizhny Novgorod, Russia

Overall instability and optimization of bar structures with random defects in case of constraints on faultless operation probability The aim of this paper is to pose and solve weight optimization problem of bar structures with constraints on faultless operation probability of a structure and constraints on design variables. Optimization method is based on a quadratic approximation of the objective function and a linear approximation of constraints on faultless operation probability of rod structures with random defects. In this paper, the initial global imperfections are considered as small independent random variables distributed according to normal law, and buckling load value is also a random variable. We study a case when under random imperfections non-multiple buckling load value is changed and non-multiple critical point type – the limit point is not changed. 10.5862/MCE.44.4 optimization geometrically nonlinear bar structures random global imperfections faultless operation probability overall instability non-multiple limit points https://engstroy.spbstu.ru/article/2013.44.4/ 04.pdf

RAR RUS 42-48 St. Petersburg State University Arutyunyan Aleksandr arutalr@rambler.ru St. Petersburg State University Arutyunyan Robert Robert.Arutyunyan@paloma.spbu.ru Corrosion cracking propagation and fatigue strength of complex technical systems The reliability problem of complex mechanical systems composed of some number of elements with the crack type defects, which growth rate is essentially governed by the processes of corrosion fatigue, was considered. Among these systems there are different engineering constructions: energetic, transport, chemical and others. Taking into account that the reliability of a system as a whole depends on the reliability of individual elements and the way of their connection, the systems with the elements connected parallel, in series and with reserved elements were considered. For each system the reliability function, based on the Poisson’s and Weibull’s distribution, was defined. The criteria for corrosion fatigue for each system were formulated and corresponding fatigue curves were constructed. In accordance with these results the practical suggestions how to design the most reliable systems were derived. 10.5862/MCE.44.5 development of corrosion cracks Griffit's strength criterion complex mechanical systems elements connected in series elements connected with reservation fatigue fracture criterion https://engstroy.spbstu.ru/article/2013.44.5/ 05.pdf

RAR RUS 49-55 State Marine Technical University, Saint-Petersburg Kovaleva Nadezhda balloun@yandex.ru Low-cyclic fatigue consideration in terms of damping parameters optimization in seismic isolation systems The article touches upon an algorithm of aimed parameters of the plastic damping development in seismic isolation systems taking into account low-cyclic fatigue. All the phases of damper bars plastic resource determination in the shuttle-type plastic damping seismic isolation systems have been considered. They include: solution to a dynamic problem of non-stationary seismic influences of a various level and duration; definition of a number of loading cycles; distribution of number of loading cycles with various level of movements; transition from movements to maximum deformations; establishment of an allowable number of cycles and a plastic resource of a core by Koffina – Menson and Palmgrema – Maynera's criteria. Also, it has been proved that the required plastic resource can be provided by means of geometry variation (length and section size of core) and number of bars alteration. 10.5862/MCE.44.6 shuttle-type seismic isolation plastic damping seismic motions cyclic loading low-cyclic fatigue plastic resource https://engstroy.spbstu.ru/article/2013.44.6/ 06.pdf

RAR RUS 56-63 https://orcid.org/0000-0001-5428-6145 Siberian State Automobile and Highway University Kadisov Grigoriy kadisov@rambler.ru

Omsk, Russia

PLC Scientific Production Association "MOSTOVIK" Chernyshov Vitaliy Chervv@mail.ru Finite-element (FE) modelling of bridge dynamics from exposure to moving load Solutions to the problem of cable-stayed bridge dynamics are received and analysed on the basis of two modelling options. According to the first one space-time finite-elements are used. The first three bridge vibration modes are shown to study cable-stayed bridge fluctuations when exposed to the vertical force moving at a constant speed and compile charts of time history strains in fixed sections of a deck. According to the second option a suspended superstructure is represented by a fold with absolutely rigid transverse membranes in joints of cables, a bridge tower is represented by a beam. Natural modes of the bridge are received by a solution of homogeneous system equations of the mixed method. Nodal lines of a fold for the first four natural modes are shown. The comparative description of applicability of the above-mentioned methods of solving problems of dynamics affected by moving load is given. 10.5862/MCE.44.7 dynamics cable-stayed bridge moving loads natural modes https://engstroy.spbstu.ru/article/2013.44.7/ 07.pdf

RAR RUS 64-68 Kazan (Volga region) Federal University Sultanov Lenar ls561@mail.ru Kazan (Volga region) Federal University Davydov Ruslan ruslan.davydov@mail.ru Numerical analysis of large deformation by finite element method In this paper a method of numerical studies of elastic-plastic bodies with finite deformations is considered. Constitutive relations obtained using the elastic potential in the flow theory. For plasticity condition Huber – Mises hardening condition criterion is applied. Incremental loading procedure is used, where allowing the variation equation is derived from the principle of virtual powers in the current configuration. For the simulation of plastic deformation the surface projection of the stress flow with iterative refinement of the current stress-strain state is applied, based on the introduction of a system of equations in resolving power of additional stresses. The numerical discretization is based on the finite element method. A solution of the test problem of elastic-plastic strain give by a circular bar, the results are compared with data, received by other authors. 10.5862/MCE.44.8 large deformation nonlinear elasticity plasticity finite deformation https://engstroy.spbstu.ru/article/2013.44.8/ 08.pdf

RAR RUS 69-71 Kazan (Volga region) Federal University Sultanov Lenar ls561@mail.ru Kazan (Volga region) federal university Fakhrutdinov Lenar bishchumbek@gmail.com Numerical study of hyperelastic materials In this paper, the research method of large deformations of hyperelastic solids using the Finger strain measure is considered. The kinematics of continua motion is given; the stress state is described by the Cauchy – Euler tensor of the true stresses. Much attention is given to the algorithm of the linearized constitutive equations in terms of the Cauchy – Euler stresses. Also, there is an example of obtaining the linearized physical ratio in the Cauchy – Euler stresses for material, which is described by Mooney – Rivlin potential. The numerical implementation is based on a finite-element method within the framework of incremental methods. To verify efficiency of the technique, several problems were solved: the problem of plane strain of the square strip and the problem of elastic deformation of the plate under uniform pressure. The results obtained do not contradict those that have been published before. 10.5862/MCE.44.9 hyperelastic materials large deformations finite-element method https://engstroy.spbstu.ru/article/2013.44.9/ 09.pdf

RAR RUS 75-83 15730895100 http://orcid.org/0000-0003-3251-3356 Saint Petersburg State University of Industrial Technologies and Design Gorshkov Alexander alsgor@yandex.ru

St. Petersburg, Russia

Saint-Petersburg State University of Technology and Design Makarov Avinir makvin@mail.ru Saint Petersburg State University of Service and Economics Romanova Alla romallaa@yandex.ru Military Space Academy named after A.F. Mozhaysky Rymkevich Pavel rymkewitch@yandex.ru Modelling of directed polymers deformation processes based on the description of the kinetics of supramolecular structures separated by energy barriers Polymers consisting of long chain macromolecules with the preferred position of its axes along certain directions are in the oriented state. Oriented polymers are characterized by high tensile strength and its ability to stretch in the direction of axis orientation. Due to these properties, oriented polymers are widely used in the construction industry. By mechanical action, the majority of oriented polymers have non-linear properties. In this paper the defining equation of nonlinear viscoelasticity of oriented polymers was worked on the basis of ideas about the existence of different conformational states of groups of macromolecules separated by an energy barrier. To describe the behavior of oriented polymers the concept of quantum deformation was introduced and kinetics of structural transitions groups of macromolecules through an energy barrier was also considered. 10.5862/MCE.44.10 polymers oriented state of polymers Boltzmann's principle nonlinear rheological properties of polymers energy barrier deformation quantum non-linear viscoelasticity theory defining equation of nonlinear viscoelasticity https://engstroy.spbstu.ru/article/2013.44.10/ 10.pdf