DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

MODELING OF RAILWAY TRACK OPERATION AS A SYSTEM OF QUASI-ELASTIC ORTHOTROPIC LAYERS

Вестник МГСУ 3/2016
  • Sycheva Anna Vyacheslavovna - Moscow State University of Railway Engineering (MIIT) Candidate of Technical Sciences, Associate Professor, Department of Buildings and Structures on the Transport, Moscow State University of Railway Engineering (MIIT), 22/2 Chasovaya str., Moscow, 125993, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Sychev Vyacheslav Petrovich - Moscow State University of Railway Engineering (MIIT) Doctor of Technical Sciences, Professor, Department of Transport Construction, Moscow State University of Railway Engineering (MIIT), 22/2 Chasovaya str., Moscow, 125993, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Buchkin Vitaliy Alekseevich - Moscow State University of Railway Engineering (MIIT) Doctor of Technical Sciences, Professor, Department of Railway Design and Construction, Moscow State University of Railway Engineering (MIIT), 22/2 Chasovaya str., Moscow, 125993, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Bykov Yuriy Aleksandrovich - Moscow State University of Railway Engineering (MIIT) Doctor of Technical Sciences, Professor, Department of Railway and Track Economy, Moscow State University of Railway Engineering (MIIT), 22/2 Chasovaya str., Moscow, 125993, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 37-46

In this paper the authors give a solution to the problem of the impact of a rolling stock on the rail track on the basis of modeling a railway track as a multi-layered space, introducing each of the layers is a quasi-elastic orthotropic layer with cylindrical anisotropy in the polar coordinate system. The article describes wave equations, taking into account the rotational inertia of cross sectional and transverse shear strains. From the point of view of classical structural mechanics train path can be represented as a multilayer system comprising separate layers with different stiffness, lying on the foundation being the elastic-isotropic space. Winkler model provides that the basis is linearly deformable space, there are loads influencing its surface. These loads are transferred through a layered deformable half-space. This representation is used in this study as an initial approximation. For more accurate results of the deformation of a railway track because of rolling dynamic loads it is proposed to present a railway track in the form of a layered structure, where each element (assembled rails and sleepers, ballast section, the soil in the embankment, basement soils) is modeled as a planar quasi-elastic orthotropic layer with cylindrical anisotropy. The equations describing the dynamic behaviour of flat element in a polar coordinate system are hyperbolic in nature and take into account the rotational inertia of the cross sectional and the transverse shear strains. This allows identifying the impact on the final characteristics of the blade wave effects, and oscillatory processes. In order to determine the unknown functions included in the constitutive equations it is proposed to use decomposition in power series in spatial coordinate and time. In order to determine the coefficients of ray series for the required functions, it is necessary to differentiate the defining wave equations k times on time, to take their difference on the different sides of the wave surface, and apply the consistency condition for the transition from the jump of the derivative of a function in the coordinate to the jump of the derivative of a sought function in time of higher order. The proposed approach allows considering the whole structure of the railway track in the form of a set of layers, making for each layer (rail - sleeper; sleeper - ballast; ballast - ballast bed) a system of equations and solving them. Therefore it is possible to vary the characteristics of different layers and their modules of elasticity, determining the optimal thickness of the ballast layer or oversleeper and undersleeper strips.

DOI: 10.22227/1997-0935.2016.3.37-46

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DOWEL AND WASHER CONNECTIONS FOR ELEMENTS OF WOODEN STRUCTURES

Вестник МГСУ 9/2016
  • Rimshin Vladimir Ivanovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, corresponding member of Russian Academy of Architecture and Construction Sciences, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Labudin Boris Vasil’evich - Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU) Doctor of Technical Sciences, Professor, Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU), 17 nab. Severnoy Dviny str., Arkhangelsk, 163002, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Melekhov Vladimir Ivanovich - Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU) Doctor of Technical Sciences, Professor, Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU), 17 nab. Severnoy Dviny str., Arkhangelsk, 163002, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Popov Egor Vyacheslavovich - Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU) postgraduate student, Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU), 17 nab. Severnoy Dviny str., Arkhangelsk, 163002, Russian Federation.
  • Roshchina Svetlana Ivanovna - Vladimir State University named after Alexander and Nikolay Stoletovs (VISU) Doctor of Technical Sciences, Professor, Vladimir State University named after Alexander and Nikolay Stoletovs (VISU), 87 Gor’kogo str., Vladimir, 600000, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 35-50

During design and production of wooden structures there often arises a problem of durability, strength and bearing capacity of buildings and structures. This issue is especially current during reconstruction, because the proper choice of connection influences the technical possibility of the works. For this aim different types of connectors are used. One should also remember that distinct anisotropic behavior is characteristic of the wood. In the given article the authors consider technical characteristics and examples of the use of certain types of timber connections, which have been developed over the last century. The advantages and disadvantages of different types of connectors, such as ring-type, tee and disk timber connectors, claw plates and paste-in washers, steel adhesive wavy toothed dowels are analyzed. The range of products and bearing capacity values of some connectors are offered. The authors make a conclusion, that in order to increase durability, strength and operation reliability of connectors it is advisable to use clamping plates which have resilience and some advantages of fractionality principle characteristic of multi-nailed connections. It is also advisable to use calculation methods corresponding to the requirements of the requirements SP and Eurocode.

DOI: 10.22227/1997-0935.2016.9.35-50

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