Abstract
The paper undertakes analysis of the dynamic impact of a rail vehicle on various types of a railway infrastructure with particular focus on the phenomenon of threshold effect within the transition zones of an engineering facility. The problem of locally variable stiffness of the railway infrastructure, which in turn could lead to the accelerated infrastructure degradation, is identified. Using the analytical and numerical background, the computational model is presented, based on which, it could be possible to determine the impact of the various rail support on the dynamic response of the entire infrastructure. The dynamic load, caused by the passage of the multiaxle rail vehicle, is taken into account in the paper. The fourth-order differential equation is solved by using the finite differences method with application of the numerical MATLAB script. The created numerical algorithm and a number of calculations allowed the formulation of several solutions that could reduce the dynamic impact of the rail vehicle on the railway surface within the transition zones. In the paper, theoretical results are compared to the field measurements conducted on a real dynamically loaded rail. Field experiments have been carried out on the railway track in operation. The vertical displacement of a rail, dynamically loaded by various types of rail vehicles passing by (both passenger and freight trains) has been investigated. Researches have been carried out in the area of transition zones of engineering facilities. Test points have been selected in places where there is a sudden change in parameters of the track structure (e.g., a change from concrete sleepers to wooden sleepers). Based on conducted researches it has been possible to validate results obtained from the numerical calculations.
Highlights
The problem of locally variable stiffness of the railway surface within the transition zones of an engineering facility has been identified, which in turn may lead to accelerated degradation of the structure and the need to incur increased expenditures on maintaining the infrastructure in proper condition.The aim of the research and computational work was to analyze the dynamic impact of the rail vehicle on various solutions of the railway surface structure, with particular emphasis on the phenomenon of the threshold effect within the transition zones of the engineering facility.The basic task of the surface is to enable safe and stable driving of a rail vehicle on a specific trajectory and to take over loads from the wheels of a rail vehicle and transfer them to the subtrack
The paper analyzed the dynamic impact of a rail vehicle on various solutions of the railway surface structure, with particular emphasis on the phenomenon of the threshold effect, which occurs within the transition zones of the engineering facility
3.3.TDheisacrtuicslseicoonmbines theoretical simulations of the dynamic process of a rail response to the wheel load by a passing rail vehicle with precise tests on a real railway line, in which laser scTanhneinpgawpitehraasnenasloyrzreecdortdhinegdfaystn-cahmanigcinigmpproaccestseosfwaasrauisledv.ehicle on various s railway surface structure, with particular emphasis on the phenomenon of effect, which occurs within the transition zones of the engineering facility of locally variable stiffness of the railway surface has been identified, whic lead to accelerated degradation of the structure and the need to incur incre
Summary
The problem of locally variable stiffness of the railway surface within the transition zones of an engineering facility has been identified, which in turn may lead to accelerated degradation of the structure and the need to incur increased expenditures on maintaining the infrastructure in proper condition.The aim of the research and computational work was to analyze the dynamic impact of the rail vehicle on various solutions of the railway surface structure, with particular emphasis on the phenomenon of the threshold effect within the transition zones of the engineering facility.The basic task of the surface is to enable safe and stable driving of a rail vehicle on a specific trajectory and to take over loads from the wheels of a rail vehicle and transfer them to the subtrack. Rubble has been replaced with layers of materials with different modulus of elasticity. They are arranged in such a way that materials with lower modules are built into the lower layers of the structure and the higher layers have the higher modulus of elasticity. In this way, each subsequent layer of the structure (sub-track, frost-resistant layer, asphalt-stabilized layer/hydraulically stabilized layer, concrete support layer, primer, rail) has increasing rigidity. Constructions of ballastless surfaces can be divided as follows: (1) surfaces in which the supporting layer consists of prefabricated slabs (IPA, Bogl, VA Shinkansen, OBB-PORR), (2) surfaces in which the supporting layer is a concrete slab (Rheda, EBS System) or bituminous layer (Getrac) laid directly on the construction site and (3) surfaces in which the rail is located in specially prepared rail channels (ERS, Infudo system, BBEST system) [2–7]
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