• Title/Summary/Keyword: 장대레일

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Sensitivity of the Continuous Welded Rail and the Fastener on the Track Stability (궤도 안정성에 대한 장대레일과 체결구의 민감도)

  • Han, Sang Yun;Park, Nam Hoi;Lim, Nam Hyoung;Kang, Young Jong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.4A
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    • pp.719-726
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    • 2006
  • The use of CWR track not only reduces the track maintenance cost, but increase the life cycle of track components. Therefore, the use of the CWR track has increased consistently in the worldwide. As the use of CWR increases in track structures, derailing disasters associating with track buckling also increase in great numbers due to high compressive thermal stress in the summer. Among many CWR parameters, the influence of the sectional properties of the rail was investigated on the stability of CWR track in this study. Also, the sensitivity of the broken fastener and the stiffness of the fastener system such as the translational and rotational stiffness was investigated.

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Stability of CWR Tracks according to the Characteristics of the Probability Distribution of the Neutral Temperature (중립온도의 확률분포 특성에 따른 CWR 궤도의 안정성)

  • Bae, Hyun-Ung;Choi, Jin-Yu;Kim, Myoung-Su;Lee, Chin-Ok;Lim, Nam-Hyoung
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.489-492
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    • 2011
  • 장대레일 궤도의 부동구간에서 발생되는 과도한 축력은 혹서기 궤도의 좌굴을 유발시켜 주행하는 열차의 안정성을 위협할 수 있다. 궤도 제원을 제외한 압축응력과 관련된 레일온도 인자, 궤도 강성과 관련된 도상저항력, 궤도의 초기결함인 궤도틀림과 같은 인자들은 기후조건, 궤도 운영조건, 유지관리조건 등에 의해 임의적으로 변동되는 불확실성이 높은 궤도 매개변수이다. 그러므로 장대레일 궤도의 좌굴은 불확실성이 높은 현상임을 알 수 있다. 따라서 궤도 매개변수들의 불확실성 및 임의성을 합리적으로 고려하기 위해서는 확률론적 접근방법의 적용이 필수적이라 할 수 있다. 본 논문에서는 기존 본 연구진에 의해 개발된 장대레일 궤도의 좌굴확률 평가시스템을 이용하여 장대레일 축력을 산정하기 위한 필수요소인 중립온도의 확률분포 특성에 따른 좌굴 안정성을 분석하였다.

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Development of Design Chart for Investigating an Additional Rail Stress and Displacement on CWR(II) - Design Chart for Railway Bridge of Conventional Line (장대레일 부가축력 및 변위 검토를 위한 설계차트 개발(II) - 일반철도 교량 설계차트)

  • Choi, Il-Yoon;Lim, Yun-Sik;Yang, Sin-Chu;Choi, Jin-Yu
    • Journal of the Korean Society for Railway
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    • v.12 no.4
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    • pp.574-581
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    • 2009
  • Displacement of the bridge and additional rail stress due to interaction between track and bridge should be limited to the design criteria. Interaction analysis was conducted to investigate the displacement and additional rail stress on CWR in railway bridge of conventional line. Particularly, various parameters affecting interaction phenomena were taken into account in the analysis to enhance an applicability. These parameters included configuration of structure, stiffness of deck and support, steel/concrete bridge, ballast/concrete track and FM/MFM type etc. The results were presented in the form of the design chart which could be useful in preliminary design of the bridge.

Development of Design Chart for Investigating an Additional Rail Stress and Displacement on CWR(I) - Design Chart for High Speed Railway Bridge (장대레일 부가축력 및 변위 검토를 위한 설계차트 개발(I) - 고속철도 교량 설계차트)

  • Choi, Il-Yoon;Cho, Hyun-Cheol;Yang, Sin-Chu;Choi, Jin-Yu;Yu, Jin-Young
    • Journal of the Korean Society for Railway
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    • v.12 no.4
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    • pp.565-573
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    • 2009
  • Displacement of the bridge and additional rail stress due to interaction between track and bridge should be limited to the design criteria. Interaction analysis was conducted to investigate the displacement and additional rail stress on CWR in high speed railway bridge. Particularly, various parameters affecting interaction phenomena were taken into account in the analysis to enhance an applicability. These parameters included configuration of structure, stiffness of deck and support, steel/concrete bridge, ballast/concrete track and FM/MFM type etc. The results were presented in the form of the design chart which could be useful in preliminary design of the bridge.

Evaluation of Installation Length of CWR Considering Rail Tenser's Capacity And Track Maintenance (레일긴장기의 성능을 고려한 효율적인 장대레일 설정방법)

  • Park, Ok-Jeong;Kim, Eung-Rok
    • Proceedings of the KSR Conference
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    • pp.72-79
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    • 2010
  • The significant of continuous welded rail (CWR) management is growing because KORAIL has the plan to convert the whole of conventional railway lines into CWRs through continuous activities since constructed the CWR track with 1.8km in Gyeongbu line in 1966. The CWR recently is needed a efficient management method because it is difficult to manage the CWR by the poor of technic and equipment, limited maintain labor force and shorted the maintain work time of CWR caused by industrialization, greenhouse effect and global warming In this point, The 70ton Tenser's which is using in the rail site has been analysised with no extra tenser's capacity in case of the under low temperature and exceed the length of 1km as a result of reviewing the CWR-related rules and standards, a series of records of safety accidents, operation obstacles, and the situation of broken rails published by KORAIL, existing rail temperature measurements, and CWR researches. Therefore avoid the excessive plan of the first set-up section, choice the proper time in the normal temperature that is possible to weld the rail, turning the difference of rail temperature and Installation temperature down is desirable.

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Constructing the Real Time Rail Temperature Database Considering Climatic Element (기후요소를 고려한 실시간 레일온도 DB구축)

  • Bae, Hyun-Ung;Choi, Jin-Yu;Choi, Sang-Hyun;Lim, Nam-Hyoung
    • 한국방재학회:학술대회논문집
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    • pp.78.1-78.1
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    • 2010
  • 장대레일 궤도는 재료적인 불확실성 및 구조계의 기하학적 불확실성이 매우 높은 시스템으로 궤도 좌굴의 위험이 상존한다. 그러므로 궤도 환경이 열악한 혹서기 장대레일 궤도의 안정성을 합리적으로 평가하는 연구는 매우 중요하다. 궤도 좌굴에 직접적 영향을 미치는 레일온도는 현재 지역의 대표 대기온도에 따른 추정된 레일온도로 사용하고 있는 실정이지만 기후조건에 따라 레일온도가 변동되기 때문에 이를 고려하여 확률분포로써 반영하는 것이 합리적이다. 본 연구는 현장 기후요소 및 레일온도 측정 실험을 수행한 자료들을 DB화하여 혹서기 장대레일 궤도의 안정성 향상 및 신뢰성 확보에 기여하고자 한다.

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Effects of Vehicle Loads on Thermal Buckling Behavior of Continuous Welded Rail Tracks (장대레일 궤도의 온도좌굴 거동에 미치는 열차하중의 영향)

  • Choi, Dong Ho;Kim, Ho Bae
    • Journal of Korean Society of Steel Construction
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    • v.12 no.6
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    • pp.727-736
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    • 2000
  • The present study investigates the influences of vehicle induced loads on the thermal buckling behavior of straight and curved continuous welded rail (CWR) tracks. Quasi-static loads model is assumed to determine the uplift region, which occurs due to the vertical track deflection induced by wheel loads of vehicle. The lateral loads of vehicle induced by weight, the speed, the superelevation and curvature of track, and other dynamic vehicle track interaction, are included in the ratio of lateral to vertical vehicle load. Parametric numerical analyses are perfomed to calculate the upper and lower critical buckling temperatures of CWR tracks, and the comparison between the results of this work and the previous results without vehicle is also included.

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장대레일 축력해석

  • 강동욱;정근영
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.631-645
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    • 2002
  • ●정의 정척레일을 연속 용접하여 1개의 레일길이를 200m 이상으로 부설한 레일 ●장대레일화 - 차량 시동/제동하중에 의한 교축방향 수평력 작용 - 기존 : 수평력 배분을 위해 단순교로 시공(레일 이음매) - 현재 : 장대레일화 ● 장점 -유지보수비 절감 -승차감 향상(충격/소음 저감) -고속화 및 운행 안전성 향상 ●단점 -큰 레일 축력(파단/좌굴) -교량부, 급곡선부, 분기부 - 장대레일 종하중(하부구조) (중략)

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Estimation of the Roadbed Settlement and Bearing Capacity According to Radius of Curve and Cant in Railroad (철도의 곡선반경 및 캔트에 따른 노반의 침하 및 지지력 산정)

  • Jeon, Sang-Soo;Eum, Gi-Young;Kim, Jae-Min
    • Journal of the Korean Society of Hazard Mitigation
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    • v.7 no.1
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    • pp.29-38
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    • 2007
  • The research on the track performance and stability of the tilting-train was performed and the settlement of the roadbed was estimated as the tilting train was being operated on the rail joint under the allowable velocity subjected to the track performance and the stability of the tilting-train. Since the impact on the continuous welded rail (CWR) induced by the tilting-train loading is different from the impact on the rail joint, it needs to investigate the settlement of the roadbed beneath the CWR. In this study, when the tilting-train is being operated on the CWR under the allowable velocity subjected to the track performance and the stability of the tilting-train, the settlement and bearing capacity of the roadbed beneath the CWR have been evaluated using numerical analysis and compared with those beneath the rail joint. The numerical results show that the settlements of the roadbed beneath CWR and rail joint are amount to 71.2% and 88.8% of the allowable settlement, respectively. And the stresses are amount to 10.4% and 12.1% of the allowable bearing capacity, respectively.

A Study on the Application of the Beam-Column Theory to Presume the Axial Force of the Continuous Welded Rail (장대 레일의 축력을 추정하기 위한 보-기둥 이론 적용에 관한 연구)

  • Lee, Woo-Chul;Ryu, Hyo-Jin;Lim, Nam-Hyoung;Lee, Chin-Ok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.6
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    • pp.159-168
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    • 2007
  • The problem of determination of axial force in continuous welded rail(CWR) has attracted a number of railroad engineers due to its practical importance in prevention of accidents related to buckling and pull apart. In this paper, we investigated the application of the beam-column theory to presume the axial force in CWR and proposed the development process of the prediction equation and model to presume the axial force in CWR.