• Title, Summary, Keyword: 차량-궤도 상호작용

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Optimum Design of High-Speed Railway Bridges Considering Bridge-Rail Longitudinal Interaction and Moving Load Effect (교량-궤도 종방향 상호작용 및 동적영향을 고려한 고속철도 교량의 최적설계)

  • Ihm, Yeong-Rok;Im, Seok-Been;Park, Kwang-Young
    • Journal of the Korean Society of Hazard Mitigation
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    • v.10 no.6
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    • pp.27-34
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    • 2010
  • Recently, high-speed railway systems have gained increased interest as a means of environmental friendly transportation, and numerous bridges for high-speed railways have been constructed accordingly. However, bridge design for high-speed railways requires more consideration than conventional railway design because fast-moving trains will lead to significant impact on bridge structures. Thus, this research proposes a revised design considering both bridge-rail longitudinal interaction and dynamic effect of trains to ensure stability of fast travelling trains. To validate the proposed design algorithm, numerical analyses are performed and compared using a constructed 250 m long bridge with 5 spans for a high-speed railway. From the numerical results, the proposed optimum design of high-speed railway bridges exhibits the most economic life-cycle-cost (LCC) when compared with several existing design approaches.

Determination of Upper Limit of Rail Pad Stiffness for Ballasted and Concrete Track of High-Speed Railway Considering Running Safety (주행 안전을 고려한 고속철도 자갈궤도 및 콘크리트궤도 레일패드의 강성 상한 결정)

  • Yang, Sin-Chu;Jang, Seung-Yup;Kim, Eun
    • Journal of the Korean Society for Railway
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    • v.14 no.6
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    • pp.526-534
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    • 2011
  • In this study, proposed is the methodology to determine the upper limit for stiffness of rail pad for the ballasted and concrete track in high-speed railway in the viewpoint of running safety, considering the dynamic characteristics of train and track and the operation environment. For the track irregularity, one of the most important input parameters for traintrack interaction analysis, the reference vertical track irregularity PSDs(power spectral densities) for the ballasted and concrete track in a wide range of frequencies were proposed based on those presented in France and Germany and that obtained from the measured data at Kyeong-Bu 1st phase high-speed railway line. Using these reference PSD models, the input data for the vertical track irregularity data were regenerated by random generation process, and then, the wheel load reduction rates according to the stiffness of the rail pads have been calculated by the train-track interaction analysis technique. Finally, by comparing the wheel load reduction rates calculated with the derailment criteria prescribed in the Korean standards for railway vehicle safety criteria, the upper limits for the stiffness of rail pad have been proposed.

Study on Dynamic Responses of Bridges Using High-speed Railway Vehicle Models (고속전철차량모형화에 따른 교량의 동적거동에 관한 연구)

  • 김상효;박흥석;허진영
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.12 no.4
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    • pp.629-638
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    • 1999
  • 본 연구에서는 고속철도에서 차량·교량 구조물의 상호작용을 가능한 정밀하게 취급할 수 있는 3차원 해석모형을 개발하였다. 경부고속철도 교량형식인 PSC 박스거더 교량을 40m 단순 와 25-40-25m 3경간 연속 에 대해 뼈대요소를 사용하여 3차원으로 모형 하였으며, 궤도의 불규칙성은 정상확률과정으로 가정하고, 지수 스펙트럼 밀도함수를 사용하여 궤도의 형상을 생성시켰다. 열차는 경부고속철도 차량 하중효과가 가장 큰 동력차 만을 대상으로 17 자유도 모형과 38 자유도 모형으로 분리하여 개발하였다. 다양한 조건에 대한 분석결과를 검토하면 여러 가지 상황에서 38 자유도 모형의 필수 성이 보여지고 있다. 특히 교량의 솟음 및 장기 처짐에 의한 궤도형상변화가 있는 경우에는 반드시 38 자유도 모형이 적용되어야 하는 것으로 분석되었다. 또한 제동하중이 작용할 때 쏠림 효과에 의한 영향이 큰 것으로 평가되어, 제동에 의한 교량의 동적 거동은 종변 위에 대한 자유 도를 고려할 수 있는 주행차량모형으로 해석되어야 함이 규명되었다.

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The Displacement Limit at the End of an Approach Slab for a Railway Bridge with Ballastless Track (콘크리트궤도 부설 교량의 접속슬래브 단부 처짐한도에 관한 연구)

  • Choi, Jin-Yu;Yang, Shin-Chu
    • Journal of the Korean Society for Railway
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    • v.11 no.2
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    • pp.195-202
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    • 2008
  • The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab could be installed to prevent such a phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and increasing the track deteriorations by excessive impact force acting on the track. In this study, parametric studies were performed to investigate the displacement limit on the approach slab to avoid such problems. The length and the amount of unequal settlement of approach slab were adopted as parameter for numerical analysis considering vehicle-track interaction. Car body accelerations, variations of wheel force, stresses in rail, and uplift forces induced on fastener clip were investigated. From the result, resonable settlement limit on the end of an approach slab according to slab length was suggested.

The Fatigue Life Evaluation of Rail on the Concrete Track of High Speed Railway by Analysis of the Vehicle/Track Interaction (차량/궤도 상호작용해석을 통한 고속철도 콘크리트궤도 레일의 피로수명 예측)

  • Lim, Hyoung-Jun;Sung, Deok-Yong;Park, Yong-Gul
    • Journal of The Korean Society of Civil Engineers
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    • v.32 no.6D
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    • pp.663-671
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    • 2012
  • The demand of CWR is rapidly increasing because of the adaptation of concrete track, the need for rapid and comfortable ride, and the reduction of maintenance cost. Because of short applying period of the concrete track, there is not a case of CWR fracture in Korea caused by repeated load of the train, which makes it difficult to calculate replacement period of rail based on rail fatigue life using an actual field data. This study thus inspected the bending stress at rail bottom through analyzing the vehicle/track interaction, performed multiple regression analysis on the data, deducted the bending stress prediction equations by the speed and the surface irregularity. Finally, the fatigue life of CWR on the concrete track was predicted based on the prediction equations for bending stress at rail bottom.

Development of evaluation method of vibration -reduction efficiency in slabtrack (열차주행에 대한 방지 슬래브궤도의 진동해석 기법 개발)

  • 양신추;강윤석;엄주환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1028-1033
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    • 2001
  • 열차주행시 열차의 이동축중에 의한 제도구조물의 동적거동은 열차의 동특성과 열차속도, 궤도의 유형 및 제도재료의 물성치에 따라 변하며 차량과 궤도의 상호작용에 따라 변하게 된다.(중략)

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Dynamics Responses of Railway Bridges for Track Irregularities (궤도의 불규칙성을 고려한 철도교량의 동적응답분석)

  • 박흥석;이용선;이상호;김상효
    • Computational Structural Engineering
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    • v.11 no.3
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    • pp.253-262
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    • 1998
  • 본 연구에서는 경부고속철도의 주요 교량형식인 PSC 박스교량을 3차원 뼈대요소를 사용하여 모형화하였으며, 궤도불규칙성의 형상은 지수 스펙트럴 밀도함수를 사용하여 생성시켰다. 경부고속철도차량(K-TGV)중 동력차는 17자유도의 3차원 주행열차로 모형화하였고, 이러한 교량, 궤도불규칙성 및 차량 모형을 이용하여 교량과 차량의 상호작용을 해석할 수 있는 프로그램을 개발하였다. 동적해석을 위한 교량과 차량의 운동방정식은 Lagrange 방정식을 사용하여 유도하였으며, 운동방정식의 수치해석에는 Newmark-β법을 사용하였다. 개발된 프로그램을 이용하여 동력차의 주행에 의한 교량의 시간이력곡선을 구하였으며, 궤도불규칙성의 영향을 분석하였다. 또한 도상의 유무에 따른 교량동적거동의 특성과 함께 열하중의 편심의 영향도 분석하였다.

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A Method for the Analysis of Train/Slab-Track Interaction on Settled Roadbed (슬래브궤도 노반침하구간 차량/궤도 상호작용 해석기법 개발)

  • Yang, Sin-Chu;Hong, Chul-Kee
    • Journal of the Korean Society for Railway
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    • v.10 no.3
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    • pp.296-305
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    • 2007
  • A numerical method for the analysis of train/slab-track interaction on the settled roadbed is developed based on the already developed analysis method of train/ballast-track interaction. The concrete slabs composed of the upper track concrete layer and the lower hydraulic bonded layer are modelled by a equivalent beam. The supporting stiffness of roadbed is evaluated with the modified boussinesq method suggested by Eisenmann. The track irregularity and the gap between slab and roadbed induced by settlement of roadbed are calculated by the effective method newly presented in this study. The validation of the developed method is investigated by a numerical example. The effects of train speed on train and slab track on the settled roadbed with sinusoidal shape of wave length 20m and amplitude 20mm are reviewed.

Dynamic Interaction Analysis of Tilting Train and Curved Track (틸팅열차 주행시 곡선부 궤도에서의 동적상호작용)

  • Chung, Keun-Young;Koh, Tae-Hoon
    • Journal of the Korean Society for Railway
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    • v.15 no.2
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    • pp.162-171
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    • 2012
  • In this study, a new dynamic interaction analysis method for tilting trains and curved track is presented. Three dimensional lumped parameter vehicle elements are used to model tilting train, and the proposed analysis technique can simulate driving direction change of vehicle, the effect of track cant, wheel-rail contact angle, and tilting angle of tilting trains, etc. The proposed method passed several basic verification tests, and it is expected that the suggested method is applicable for practical problems.