Кафедра Управління перевезеннями і технологічними процесами залізниць <br>(Раніше Кафедра "Транспортні технологіі")

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ENG: Department of Railway Transport and Technological Management
(Formerly Department of Transport Technologies)

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Investigation of KPP-5 Rail Fastener Elastic Deformation
(Universiti Malaysia Pahang, Malaysia, 2018) Marcul, Ruslan V.; Nastechik, Nicolai P.; Kovalchuk, Vitalii V.; Hnativ, Yuriy M.
EN: For a long period of operation, a number of shortcomings have been identified in KPP-5 fastener that is mainly due to an intensive decrease of pressing force of the rail on leepers. This leads to the appearance of frequent cases of track displacement and fastening elements failure. To verify such hypothesis, the process of power work of KPP-5 fastener during railway track operation was researched. The technique and practical means of controlling the power work of KPP-5 fastener are developed. The influence of various factors of the rail pressing force on the sleeper is determined. The main influence is conditioned by under-rail wear (50.4%). The obtained results made it possible to formulate recommendations for the improvement of KPP-5 fastener where the methodology and practical means of controlling the power work of KPP-5 fastener were proposed. At the same time, it allows increasing the reliability and safety of the rail track during the entire overhaul period.
Method of Calculation of Temperature Field and Deflected Mode of Bridge Structures in Software Environment NX NASTRAN
(Szcześniak, Warsaw, 2013) Luchko, Josyp; Hnativ, Yuriy M.; Kovalchuk, Vitaliy V.
EN: Abstract: Designs of bridges and overpasses during operation are sustained to complex climatic factors. Study of heat exchange components is an integral part of preparation data for thermal stresses and deformations calculation. Sequence determination of thermal stresses and deformations of bridge structures. Close conditions of the structural elements of modern bridges and overpasses, a variety of their shapes, materials and sizes result in extremely difficult and expensive full- or part-scale investigations. In this regard, there is need to develop and apply various computational approaches that allow relatively in a short time and with little cost to obtain data about engineering structures.
Restoration of the Bearing Capacity of Damaged Transport Constructions Made of Corrugated Metal Structures
(RTU Press, Latvia, 2021) Kovalchuk, Vitalii V.; Sysyn, Mykola P.; Hnativ, Yuriy M.; Onyshchenko, Artur; Koval, Maksym; Tiutkin, Oleksii L.; Parneta, Mariana
ENG: The paper deals with damages of transport constructions made of corrugated metal structures in the body of a railway track or a road during their operation. A constructive variant to restore the bearing capacity of structures was developed, which consists of installing an annular stiffening rib into the concave part of the corrugated metal profile. The main advantage of this method compared to the double corrugating method is the possibility of performing the reinforcement works during structure operation without interrupting the movement of transport vesicles. The study has proved that the reinforcement method significantly increases the carrying capacity of corrugated metal structures. A numerical finite element model was developed to determine the stress-strain state of structures made of corrugated metal structures reinforced with round stiffening ribs. The soil pressure on the corrugated shell in the model is taken into account with the application of radial and axial forces on the outer surface of the shell. It was determined that the most appropriate location of the ribs is in the centre of the building, where the reinforcement area corresponds to the width of the road or railway line. The advantage of this approach is the ability to more efficiently distribute the reinforcement material by selecting the ribs in the most loaded sections of corrugated metal structures.