Magazine of Civil Engineering, No.9(44), 2013
The special. Proceedings of the conference "Mathematical and Computer Simulation in Mechanics of Solids and Constructions Boundary & Finite Elements Methods" (BEM&FEM 2013)


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Determination of aerodynamic parameters of "Olympic Park" railway station canopy. Physical and numerical experiments

Meleshko V.A., Khertek U.Kh., Rogovoy Yu.A.
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.
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Adaptive models of short-term surface subsidence prediction and detection of the most hazardous building position in displacement trough

A.V. Vorobyev, G.G. Kashevarova
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.

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 STRUCTURES
Optimization of frame structures with possibility f emergency actions

I.N. Serpik, A.V. Alekseytsev
Optimization of frame structures with possibility f 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.
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Overall instability and optimization of bar structures with random defects in case of constraints on faultless operation probability

O.A. Sergeyev, V.G. Kiselev, S.A. Sergeyeva
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.
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Corrosion cracking propagation and fatigue strength of complex technical systems

A.R. Arutyunyan, R.A. Arutyunyan
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.
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 METHODS
Low-cyclic fatigue consideration in terms of damping parameters optimization in seismic isolation systems

N.V. Kovaleva
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. 
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Finite-element (FE) modelling of bridge dynamics from exposure to moving load

G.M. Kadisov, V.V. Chernyshov 
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. 
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Numerical analysis of large deformation by finite element method

L.U. Sultanov, R.L. Davydov
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.
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 MATERIALS
Numerical study of hyperelastic materials

L.U. Sultanov, L.R. Fakhrutdinov
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.
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Modelling of directed polymers deformation processes based on the description of the kinetics of supramolecular structures separated by energy barriers

A.S. Gorshkov, A.G. Makarov, A.A. Romanova, P.P. Rymkevich
Modelling of directed polymers deformation processes based on the description of the kinetics of supramolecular structures separated by energy barriers

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. 
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