In order to measure the real-time displacement of a rail with train vehicles on service, a displacement meter has to be installed near the rail in conventional method. However, on this study, an innovative method is developed to measure the displacement of rail in real-time using laser vibrometer in a distance.

Railroad concrete track is continuously supporting structure for repeated impact loads. Fine cracks which occurred in the early stage of the train operation, gradually expanded depending on the tonnage increases, and the function of the slab track is reduced. And, occurrence of track irregularity, worsening of ride comfort and interfere with the safe operation of trains would be follows. Therefore, management and maintenance of the initial crack is very important, railroad maintenance overhaul organizations detected twice a year or more the cracks and paint it, displays the location and severity, the type of cracks, width and length by creating a developed view. Each year much maintenance works is required for checking the crack of concrete trackbed and sleepers.

In this study, it explains briefly the test procedure for evaluating the performance of track and bridge in test-bed section of Honam High-Speed Railway.

Test-bed site in Honam High Speed Railway is under construction for developing infra system core technology and speed-up test over 400km/h. High Speed Railway Infra System’s development are composed of comprehensive research developments which are comprising infra system such as railraod infrastructure, environmental noise reduction, catenary, train control and etc. For high speed-up, the review of track alignment, structural and running safety are required. In this paper, speed-up patterns of train by TPS and structural safety according to load variation are evaluated.

The tramway embedded track is the concrete slab track in which rail is embedded for transit and walking over the pavement. The multi-directional continuous supported embedded track system by liquid polyurethane has high performance in reducing sound and vibration, the advantage of maintenance abroad. Domestic newly-developed embedded track was installed in Osong-test site after laboratory test and yard test. In this paper, newly –developed Polycork ERS rail fastening system was tested and the embedded track system was tested in the field

The construction of underground rail crossing is effect on railroad infra-structure and rail safety. So various methods have been suggested to construct through the infra-structure on the railroad. This paper treats the results of studies for safety of temporary bridge using a commercial FEM program, RM which is operated based on data measured on a sites. Also it was carried out optimal section considering characteristic of dynamic which reflects actual load for speed cases.

In this study, it was investigated dynamic behaviors of track roadbed with various loading frequency with real train loading using a full scale testing as MTS system. The dynamic behaviors of track roadbed system was increased linear regression with increased loading frequency at less than 35Hz, but was decreased at wheel load, displacement, and acceleration over 35Hz. It was found that critical loading frequency was about 35Hz, and that velocity level of train speed was evaluated about 320km/h～340km/h.

According as tracks are twisted on running, wheel loads applied to outer rail are increased on curved track. Canting on tracks considering the balance cant allows to have permissible cant deficiency. The test bed area of Ho-Nam high railway is planed for 400km/h Speedup test, cant deficiency is expected to generate centrifugal load in the curve. Therefore, Korean design criteria recommend to increase maximum 20% of wheel load. This study shows that normalized wheel load variations are analyzed its stationary in inner and outer rail when centrifugal forces in outer rail of a curve are caused by curve radius, cant, velocity. Vertical wheel loads are reviewed on the behaviors of each structural element according to the increase of velocity.

궤도틀림은 열차의 주행안전 및 승차감에 미치는 영향이 크고, 소음 진동의 주요원인으로 작용한다. 따라서 현장에서 발생하는 궤도의 틀림을 체계적으로 분석함으로써 이를 저감할 수 있도록 차량운행 조건과 선로선형 및 궤도구조를 설계하는 것은 중요한 과제이다. 현재 국내에서 EM-120에 의해 검측된 틀림 데이터는 매우 불규칙적인 형태를 나타내며 데이터 분석 시 다양한 문제점을 가지고 있다. 본 연구에서는 궤도의 효율적인 유지관리를 위해 검측된 틀림데이터의 효율적인 처리 기법을 개발하고, 정제된 데이터를 이용해 선로를 구성하고 있는 이음매, 도상, 노반, 체결구 등의 요소를 고려하여 레일 궤도 틀림의 진전 정도를 정량화 하였다. 또한 축적된 검측 데이터로부터 궤도의 건전도를 평가할 수 있는 방법을 정립하고 잔존수명을 예측하여 효율적 유지관리를 실현하기 위하여 검측 데이터의 확률론적 수명 산정 기법 개발 및 데이터를 이용한 구간 특성에 따른 궤도틀림 표준편차의 틀림 진전 정도에 대한 통계 및 확률적 분석을 수행하였다.

레일마모는 열차의 주행안전 및 승차감에 미치는 영향이 크고, 소음․진동의 주요원인으로 작용한다. 또한 레일마모가 발생할 경우 궤도구조의 파괴를 촉진시킴으로써 차량 및 궤도유지보수비를 크게 증가시킨다. 따라서 현장에서 발생하는 마모 원인을 체계적으로 분석함으로써 마모를 저감할 수 있도록 차량운행 조건과 선로선형 및 궤도구조를 설계하는 것은 중요한 과제이다. 본 연구에서는 궤도의 효율적인 유지관리를 위해 궤도를 구성하고 있는 레일, 체결구, 침목, 도상 등의 요소를 고려하여 레일 궤도의 생애주기 거동 및 유지관리 특성을 분석하였다. 또한 축적된 진단/검측 데이터로부터 궤도 구성품의 건전도를 평가할 수 있는 방법을 정립하고 잔존수명을 예측하여 효율적 유지관리를 실현할 수 있는 기법 개발을 위하여 지하철 레일단면마모데이터를 이용한 구간 특성에 따른 시간-마모량의 확률적 분포 변화와 다중회귀 분석을 수행하였다.