Abstract
Countries such as Korea adopt design codes, evaluation criteria and specifications from standards originating abroad; this leads to a lack of distinction of the separate applications of dynamic stability evaluation parameters between various track structures of different track moduli. This paper discusses the applicability of the dynamic stability evaluation method of railway track structures by assessing 10 different types of railway track sections of a newly constructed railway operation line (5 ballasted and 5 concrete type track structures) by field instrumentation testing. Parameters of track support stiffness (TSS), wheel load fluctuation, derailment coefficient, and rail displacement are measured. The respective results are first compared to the standard criteria (design specification) and comparisons between the different track types are presented as ratios. Findings show that while all of the tracks satisfy the design specification requirements, each track type measurement result varies by a noticeable degree, particularly when comparing between concrete and ballast type track structures. Results of the study demonstrate that using the same dynamic stability evaluation criteria can lead to an incorrect assessment of the track performance evaluation of track structure, and a separate evaluation parameter for ballasted and concrete track structures is required.
Highlights
Countries with a relatively short history of railway infrastructure development reference other international standards for design and maintenance of tracks
The derailment coefficient is defined as the ratio of lateral pressure and the wheel load of a railroad vehicle
This study showed the limitations of conventional track performance evaluation methods currently used as part of internationally adopted national standards and design codes
Summary
Countries with a relatively short history of railway infrastructure development reference other international standards for design and maintenance of tracks. The Korean Railway Code (KRC), the representative design specification code for both ballast and concrete track structures is mostly drafted by adopting the Union of Railways (UIC) or the American Railway Engineering and Maintenance-of-Way Association (AREMA) code. It is common knowledge in the academic field of railway engineering that, due to the respective environmental conditions and the difference in the types of components used in the various countries, the evaluation criteria and the methods are different case by case, nor are they fully theoretically consolidated.
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