• 한국산학기술학회논문지
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• 제16권2호
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• pp.1469-1476
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• 2015

산지가 전국토의 70%를 차지하는 국내 지형의 특성으로 인하여, 철도선로 전체 노선의 상당부분을 교량구간이 차지한다. 이에 따라 교량 설계 시 경제성 증가를 위하여 경간장을 늘리는 것이 유리하지만 궤도-교량 상호작용에 의한 레일의 부가축응력, 변위 등의 문제로 인한 제약이 발생한다. 본 연구에서는 궤도와 교량 상판 사이에 설치되는 슬라이딩 층을 고려한 궤도-교량 상호작용 해석을 수행하였다. 수치해석 결과를 통해 슬라이딩층 설치 방법에 따른 상호작용 거동을 분석하였으며, 궤도-교량 상호작용이 저감된 새로운 궤도-교량 구조시스템의 개발방향을 제안하였다.

• Interaction and multiscale mechanics
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• 제5권1호
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• pp.1-12
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• 2012

Considerable longitudinal rail forces and displacements may develop in continuous welded rail (CWR) track on long-span bridges due to temperature variations. The track stability may be disturbed due to excessive relative displacements between the sleepers and ballast bed and the accompanied reduction in frictional resistance. For high-speed tracks, however, solving these problems by installing rail expansion devices in the track is not an attractive solution as these devices may cause a local disturbance of the vertical track stiffness and track geometry which will require intensive maintenance. With reference to temperature, two actions are considered by the bridge loading standards, the uniform variation in the rail and deck temperature and the temperature gradient in deck. Generally, the effect of temperature gradient has been disregarded in the interaction analysis. This paper mainly deals with the effect of temperature gradient on the track-bridge interaction with respect to the support reaction, rail stresses and stability. The study presented in this paper was not mentioned in the related codes so far.

• 대한토목학회논문집
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• 제35권5호
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• pp.1179-1189
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• 2015

장대레일을 적용한 교량상 콘크리트 궤도는 온도하중 및 시제동 하중에 의하여 종방향 상호작용력이 크게 발생하며, 이를 해소하기 위하여 활동체결장치 또는 저체결력 체결장치와 같은 특수체결장치를 적용하거나 레일신축이음장치를 설치하여야 한다. 슬라이딩 슬래브 궤도는 교량과 궤도 슬래브 사이에 슬라이드층을 두어 상호작용을 저감시킬 수 있는 것으로 알려져 있다. 이 연구에서는 슬라이딩 궤도와 일반 콘크리트 궤도를 적용한 교량에 대하여 상호작용 해석 결과를 제공한다. 해석 결과 슬라이딩 궤도를 적용함으로써 장대레일에 발생하는 부가 축력을 현저히 저감시킬 수 있는 것으로 밝혀졌으며, 그 차이는 장경간 및 연속교에서 더욱 큰 것으로 나타났다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 춘계학술대회 논문집
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• pp.414-421
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• 1999

In this paper, the simplified method for 2-dimensional train/track/bridge interaction analysis is utilized in the analysis of dynamic behavior of bridges in which the eccentricity of axle loads and the effect of the toriosnal forces acting on the bridge are included for the more accurate train/track/bridge interaction analysis. Inverstigations mainly into the influence of vehicle speed on train/track/bridge interactions are carried out for the two cases. The first case is that only train and bridge are considered in the modelling and the other case is that train, track and bridge are considered.

• 한국안전학회지
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• 제25권5호
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• pp.54-61
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• 2010

The additional axial force of CWR(continuous welded rail) is occurred by structure-track interaction, in reverse, fixed supports of structure are applied the large load by that. Ratio of load which transferred on support through the bridge superstructure with one-side REJ by acceleration and braking load are stated in High-Speed Rail Design Criteria(2005). On the other hand the horizontal forces of support delivered to the load due to thermal loads has been no report about the criteria. Therefore, this study was performed the review of the reaction and displacement on support by structure-track interaction in a special bridge(composite brdiges, 45+55+55+45=200m) with REJ acting on the temperature load. As a result, because fixed support of a special bridge or a continuous bridge with REJ under the temperature load which is constant load has been acted the large lateral load by structure-track interaction, when determining the fixed bearing capacity of structure should be reflected in the results to secure the safety of structures was confirmed.

• Structural Engineering and Mechanics
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• 제78권2호
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• pp.163-174
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• 2021

Track-bridge interaction has become an essential part in the design of bridges and rails in terms of modern railways. As a unique ballastless slab track, the longitudinal continuous slab track (LCST) or referred to as the China railway track system Type-II (CRTS II) slab track, demonstrates a complex force mechanism. Therefore, a comprehensive track-bridge interaction study between multi-span simply supported beam bridges and the LCST is presented in this work. In specific, we have developed an integrated finite element model to investigate the overall interaction effects of the LCST-bridge system subjected to the actions of temperature changes, traffic loads, and braking forces. In that place, the deformation patterns of the track and bridge, and the distributions of longitudinal forces and the interfacial shear stress are studied. Our results show that the additional rail stress has been reduced under various loads and the rail's deformation has become much smoother after the transition of the two continuous structural layers of the LCST. However, the influence of the temperature difference of bridges is significant and cannot be ignored as this action can bend the bridge like the traffic load. The uniform temperature change causes the tensile stress of the concrete track structure and further induce cracks in them. Additionally, the influences of the friction coefficient of the sliding layer and the interfacial bond characteristics on the LCST's performance are discussed. The systematic study presented in this work may have some potential impacts on the understanding of the overall mechanical behavior of the LCST-bridge system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.3156-3159
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• 2011

In case of the continuous welded rail(CWR) track is supported by the railway bridge, the additional axial force is occurred in the CWR due to the track-bridge interaction. In the various design codes such as Korean code, European code, UIC code, etc, three important loads(temperature variation in the bridge-deck, braking/acceleration and the bending of the bridge-deck resulted from the passing train) are treated as the independent loading case. In other words, the additional axial force can be obtained by summing up the three different values calculated by the three independent analysis. However, this analysing method may have an error because the behavior of the longitudinal resistance between the rail and the bridge-deck is under the highly nonlinear. Therefore, in order to exactly analyse the track-bridge interaction, nonlinear loading history and the change of the longitudinal resistance owing to the loading history must be considered in the analysis process. In this study, the loading history effect on the track-bridge interaction is investigated considering the resonable combination of three loads and the longitudinal resistance change.

• 한국철도학회논문집
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• 제16권3호
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• pp.217-225
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• 2013

본 연구에서는 교량 단부의 레일지지점 간격, 교량과 교대사이 거리(유간) 및 교량 단부 회전각을 고려하여 콘크리트 궤도가 부설된 교량 단부 궤도의 거동을 분석하였다. 궤도구조가 고려된 교량 및 교대 시험체를 이용한 실내시험 결과, 동일한 유간(레일지지점 간격)에서 교량 단부 회전각이 증가함에 따라 레일의 변위가 선형적으로 비례하는 것으로 나타났다. 또한 이러한 레일의 변위는 레일 및 체결구의 발생응력에 직접적인 영향을 미치는 것으로 분석되었다. 실험결과를 바탕으로 다중 회귀분석을 수행하여 레일지지점 간격 및 교량의 단부 회전각을 매개변수로 하는 철도교량 단부 궤도의 궤도-교량 상호작용력 예측식을 도출하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.1015-1021
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• 2001

This paper represents the results carried out to determine the dynamic response characteristics of Korea High Speed Rail(KHSR) bridges. The responses of the KHSR bridges subjected to the moving train loading are obtained through the simplified method for the 2-dimensional train/track/bridge interaction analysis in which the eccentricity of axle loads and the effect of the torsional forces acting on the bridge are included for the more accurate train/track/bridge interaction analysis. The results of the analyses are compared with the field test data to verify the performance of the 2-dimensional train/track/bridge interaction analysis method.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.366-373
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• 2000

This paper represents the results carried out to determine the dynamic response characteristics of Korea High Speed Rail(KHSR) bridges. The responses of the KHSR bridges subjected to the moving train loading are obtained through the simplified method for the 2-dimensional train/track/bridge interaction analysis in which the eccentricity of axle loads and the effect of the torsional forces acting on the bridge are included for the more accurate train/track/bridge interaction analysis. The results of the analyses are compared with the field test data to verify the performance of the 2-dimensional train/track/bridge interaction analysis method.