Articles published in the issue 11, 2018
The current norms for designing railway plans and profiles that require adjustment when implementing digital designing technologies
Keywords: norms, railway plan and profile, designing, simulation, interaction between railways and rolling stock.
Ermakov Vyacheslav — D.Sci., Chief Engineer of AO Transputstroy. Moscow, Russia. Е-mail: email@example.com
Zenzinov Boris — Ph.D., the Head of laboratory at JSC VNIIZhT. Moscow, Russia. Е-mail: firstname.lastname@example.org
Levinzon Mikhail — D.Sci., Executive Director of IC VEIP LLC. Moscow, Russia. Е-mail: email@example.com
Abstract. The article presents an analysis of the current norms for designing railway plans and profiles that require adjustment when implementing digital designing technologies and repairing railways. We have carried out a simulation of interactions between the railway and rolling stock at the sections with curve junction in the plan and profile and have provided rationale for excluding some obsolete limitations that are preserved in the current regulations.
Small and midsized bridges maintained on the Verkhnezeyskaya permanent way division
Keywords: small and midsized bridges, technical state, permafrost soils.
Shvets Yaroslav — Research fellow of department «Bridges, tunnels and underground constructions» of Far Eastern State Transport University. E-mail: firstname.lastname@example.org
Abstract. Structural assessment of small and mid-sized bridges maintained on the Verkhnezeyskaya permanent way division of the Far East Railroad is set forth in the article. It is pointed out that bridge supports constructed in accordance with Principle I (permanently frozen soil during the whole maintenance period of artificial structures) are almost twice the rate more vulnerable to excessive stress-strain deformation as compared with the bridges that rest on non-subsiding melting soils. Temperature survey of the permafrost foundations in the structures under investigation is performed. It is indicated that to maintain the specified carrying capacities of bridge and pipe culverts, some requisite measures for stabilizing temperature conditions of the permafrost foundations are to be taken.
Dynamic interaction of train and bridge decks on high-speed railways
Keywords: bridge, high-speed railways, dynamic interaction, numerical simulation, resonance.
Diachenko Leonid — Ph.D., Emperor Alexander I St. Petersburg State Transport University. S-Petersburg, Russia. E-mail: email@example.com, SPIN-код: 6925-2658.
Smirnov Vladimir — D.Sci., Professor Emperor Alexander I St. Petersburg State Transport University. S-Petersburg, Russia. E-mail: firstname.lastname@example.org, SPIN-код: 5647-5575.
Abstract. One of the main features of bridge structures located on high-speed railways is the dynamic character of their operation under the passing live loads. The relevance of the study of the interaction of bridge structures with high speed trains is due to increased requirements for ensuring the safety of train traffic and the comfort of passengers.
In this paper, based on numerical simulation, the results of the study of the motion of a high-speed train along bridge structures in the resonance mode of vibrations are presented. In this formulation, special attention was paid to the control of dynamic phenomena at the level of the «wheel—rail» contact. The dynamics of nonclipped parts of the train car determines the magnitude of the contact force, which in turn characterizes the possible detachable movement of the wheel, which is inadmissible for the safety of the train. Analysis of the results obtained, using the example of a 50 m long simple span structure, developed for the Moscow—Kazan high-speed railway, allows us to conclude that the resonant nature of the vibrations of simple beam is not a critical phenomenon.
Profile deformations of a subgrade in the conditions of permafrost
Keywords: subgrade, subsidence, thermokarst lowering, heaving soil, ballast berm, bearing sag.
Fazilova Zulfiya — Ph.D., associate Professor of the Department of «Transport construction», Russian University of Transport (MIIT). Moscow, Russia. E-mail: email@example.com. SPIN-code: 9817-6928.
Shapran Vladimir — chief of production and technical Department of the Vorkuta distance of a way, JSC RZD. Vorkuta, Russia. E-mail: di-ShapranVV@nrr.ru
Skvortsov Oleg — roadman of a subgrade of the Vorkuta distance of a way, JSC RZD. Vorkuta, Russia. E-mail: firstname.lastname@example.org
Abstract. In article are considered the questions of deformation of a subgrade on permafrost soil. There are given the reasons of their emergence and the list of the technical actions directed to their elimination.
Resource-saving production sleepers of modified wood
Keywords: sleeper, modified wood, technology, manufacture, resource saving, drying and press complex.
Medvedev Ilya — Ph.D, Junior researcher, Voronezh State University of Forestry and Technologies named after G.F. Morozov. Voronezh, Russia. E-mail: email@example.com, SPIN-код: 6577-5898.
Shamayev Vladimir — D.Sci, Professor Department of drivelinemedia, Voronezh State University of Forestry and Technologies named after G.F. Morozov. Voronezh, Russia.
E-mail: firstname.lastname@example.org, SPIN-код: 6351-4087.
Parinov Dmitry — Junior research fellow, Voronezh State University of Forestry and Technologies named after G.F. Morozov. Voronezh, Russia. E-mail: email@example.com, SPIN-код: 2974-6237.
Abstract. Modified wood is widely used in various sectors of the economy. Currently in Russia in the construction and repair of the top structure of a railway track used primarily wooden and concrete sleepers. The use of wooden sleepers is much lower than reinforced concrete it is due to the depletion of pine timber stocks, short service life of sleepers (15—20 years), the purpose of the railway section, climatic conditions and terrain features. With the use of concrete ties is manifested is not suitable sleepers-quality concrete: the lack of damping properties, high electrical conductivity, significant weight sleepers, brittleness at low temperatures.
Developed resource-saving technology and equipment allows us to obtain railway sleepers broad gauge of modified wood with improved performance using low-value, widely accessible wood of soft hardwoods.