• 제목, 요약, 키워드: CWR

검색결과 133건 처리시간 0.049초

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

  • 전상수;엄기영;김재민
    • 한국방재학회 논문집
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    • v.7 no.1
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    • pp.29-38
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    • 2007
  • 틸팅차량의 안정성 확보를 위해 궤도부담력과 주행안정성 검토가 이루어졌으며, 틸팅차량이 궤도부담력과 주행안정성 검토에 의해 산정된 허용속도로 운행될 경우 레일이음매 하부 노반침하에 대한 연구가 수행되었다. 열차 주행시 레일이음매와 장대레일에 작용하는 충격량이 다르기 때문에 장대레일 하부 노반에 대한 안정성 검토가 추가적으로 필요하다. 본 연구에서는 장대레일에 대하여 노반의 침하량 및 지지력을 수치해석을 통해 검토하고 허용침하량 및 허용지지력과 비교하여 노반의 안정성을 검토하였으며 레일이음매와 장대레일 하부 노반의 침하량 및 지지력을 비교 분석하였다. 그 결과, 장대레일 및 레일이음부 하부 노반의 침하량은 허용침하량의 71.2% 및 88.8%, 응력은 허용지지력의 10.4% 및 12.1%로 나타났다.

철도고가교 급곡선부 레일장대화 방안연구 (A study of CWR on railway viaduct with sharp curves)

  • 이상진;김기훈;신순호;이주헌
    • 한국철도학회:학술대회논문집
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    • pp.415-422
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    • 2000
  • The Seoul Subway Line 4 crossing downtown diagonally constructed in February 1980 and opened on October 11, 1983. The line 4 is thus able to link southern and northern parts of Seoul with the downtown as well as with the Seoul outskirts. More than 810,000 people use it everyday. Line 4 was constructed like Line 1,2,3 with ballast track system causing much maintenance cost gradually and espicially much public discontent due to wheel and rail contact noise by railway viaduct with sharp curves. CWR on railway viaduct with sharp curves, 180m$\leq$R$\leq$300m, hasn't been designed and constructed ever in domestic. Therefore in order to reduce noise and vibration caused by interaction between wheel and rail the possibility and the methods of CWR(Continuous Welded Rail) on railway viaduct with sharp curve less than R300 will lead it to the maintenance free system.

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경계조건에 따른 판형교 장대레일의 거동 특성 (The characteristics of the behaviour of plate girder bridges according to the boundary conditions.)

  • 민경주;정의하;김영국
    • 한국철도학회:학술대회논문집
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    • pp.356-363
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    • 2003
  • The CWR of the plate girder bridges in non-ballast causes the additional axial force on the rail and the bearing due to the temperature axial force and the interaction between the CWR and bridges. This study shows the remarkable improvement of reducing the axial force of the CWR on the non-ballast bridge, compared to conventional methods. New method, which is differently designed in terms of longitudinal semi-rigid bearing, reduces the axial force on the bearing by making the girder act both directions. This method is applicable to most cases of bridges regardless of the restriction of length, and useful to reduce the abrasion and damage of the track material.

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장대레일이 설치된 교량에서의 축방향 변위 및 축력 변화 연구 (A Study of Longitudinal Forces and Displacements in a Multi-Span Bridge Equipped with a CWR Track)

  • 이주헌;허영
    • 한국철도학회:학술대회논문집
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    • pp.442-449
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    • 1999
  • Due to temperature variations, considerable longitudinal rail forces and displacements may develop in continuous welded rail(CWR) track on long-span bridges or viaducts. Excessive relative displacements between sleepers and ballast bed may disturb the stable position of the track in the ballast which results in a lower frictional resistance. Generally, these problems are solved by installing rail expansion devices. However the application of expansion devices in high-speed tracks on existing bridges, as a means to prevent excessive longitudinal displacements and forces, is not attractive method due to comfort, safety and maintenance aspects. An alternative and very effective solution is possibly the use of so-called zero longitudinal restraint(ZLR) fastenings over some length of the track. The calculations, carried out in this respect, show a considerable reduction of track displacements, track forces, and the relative sleeper/ballast displacements. This reduction depends on the length over which these fastenings are installed. In this paper calculations of the longitudinal displacments and forces in a CWR track and substructure resulting from thermal, mechanical and kinematical loads were carried out using the FEM analysis program LUSAS

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매개변수해석을 통한 고속전철교량상 장대레일궤도 안전성 검토 (Parametric Study on the Safety of CWR Track over High-Speed Railway Bridges)

  • 강재윤;김병석;김영진;박성용;조정래;최은석;진원종
    • 한국철도학회논문집
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    • v.5 no.1
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    • pp.1-9
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    • 2002
  • Where the track is continuously welded over the bridge, the longitudinal forces will be distributed interactively between the track and the sub-structure by the rail-bridge interaction mechanism. The ratio between the longitudinal forces transmitted in each elements depends on the magnitude of the ballast resistance and the stiffness of the sub-structures. In this paper, the main factors affect on the longitudinal rail force are discussed and the parametric study for the behavior of CWR(Continuous Welded Rail) track was executed. It is concluded that the horizontal ballast resistance and the stiffness of the bridge sub-structure are the significant parameters affecting the stability of the continuous welded rail track.

현장계측을 통한 교량상 분기기 축력 분석에 관한 연구 (Analysis of the axial force in CWR connected with turnout by means of the field measurement)

  • 최진유;김인재;황성호;양신추
    • 한국철도학회:학술대회논문집
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    • pp.1289-1292
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    • 2006
  • The demand on a turnout layed on a bridge is rising owing to the increasing number of stations on the viaduct. And also the demand on a turnout with CWR is rising to upgrade running speed of the passing train. A CWR connected with turnout is subjected to additional axial force induced by the actions due to change in temperature, braking and starting force, and bending of the deck. But magnitude and distribution of the axial force in rails of turnout is not clear yet. So, in this study, a field measurement was conducted to know them. The strain gage method was adopted for field test. The FBG sensor for the strain measurement was used to ensure stability of test value and durability of gage for long term. It is expected that we can get data on the axial force in rail connected with turnout with respect to seasonal temperature change by the established field test system.

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경부고속철도 교량상 장대레일의 온도응력 계측 실험 (Investigation of Thermal Stress of Continuous Welded Rail on High Speed Railway Bridge)

  • 강재윤;최은석;진원종;이정우;곽종원;김병석
    • 한국철도학회:학술대회논문집
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    • pp.458-461
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    • 2007
  • Recently, the continuous welded rail(CWR) track has been used for less maintenance of the High-speed railway tracks. In case of CWR track, track buckling has always been an unpredictable event under the high compressive stress in rail. The behavior and stress state of CWR track is manily influenced by its thermal variations, and it is important to understand seasonal variations of rail temperature and stress to predict the track stability. This paper describes the in-site measurement for the rail temperature and rail stress, and the correlation between the rail temperature and stress was examined.

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교량설계를 위한 장대레일 축력 특성 분석 (Characteristics of the stress on CWR for railway bridge design)

  • 최일윤;조현철;최진유;양신추
    • 한국철도학회:학술대회논문집
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    • pp.1395-1400
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    • 2007
  • Characteristics of the stress on Continuous Welded Rail(CWR) were investigated to apply to design procedure for railway bridge design. Actions due to change in temperature, braking/traction and bending of the deck were considered in this interaction analysis between CWR and bridge deck. The bridge parameters such as static arrangement of the deck and support stiffness were taken into consideration to examine the influence of the parameters on the additional rail stress. The final results of this study, which include the displacement as well as the stress will be presented in the form of the design chart in future.

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장대레일 축력을 고려한 REJ 미적용 고속철도 특수교량 형식 제시 및 변수별 분석 (Type Suggestion and Parameter Study for Long-Span Bridge of High-Speed Railway without the REJ considering CWR Axial Force)

  • 이종순;주환중;신재열;윤성순;박선희;남형모
    • 한국철도학회:학술대회논문집
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    • pp.1254-1261
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    • 2011
  • Application of long-span bridge, which is affected by parameters such as span length, shoe boundary condition, track property and stiffness of superstructure and substructure etc., can vary. Especially, by CWR aspects of the axial force, long-span high speed railway bridges are limited at type and span length. In this study, in terms of CWR axial force, the long-span high-speed railway bridges without REJ(Rail Expansion Joint) is to propose the bridge type. Various Parameters analysis performed for the proposed type(Arch bridge, Cable-stayed bridge).

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장대레일 축력을 고려한 고속철도 특수교량의 변수별 분석 (Parameter Study for Long-Span Bridge of High-Speed Railway considering CWR Axial Force)

  • 이종순;조수익;박만호;주환중;남형모
    • 한국철도학회:학술대회논문집
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    • pp.1452-1459
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    • 2010
  • Application of long-span bridge, which is affected by parameters such as span length, shoe boundary condition, track property and stiffness of superstructure and substructure etc., can vary. Especially, by CWR aspects of the axial force, that can be less constraints of construction depending on whether the application of rail expansion joint(REJ), which has disadvantaged in terms of maintenance. In this study, it was performed parameter study for multiple variables (shaft length, the upper and lower cross-section characteristics, track characteristics, etc.) in terms of CWR aspects. Structure-rail interaction analysis was applied to the typical simple span PSC Box and 3 span continuous bridge Extradosed Bridge(50m+80m+50m) excluding REJ. If you set the boundary e of variables for long-span railway bridge excluding REJ through the this study, when designing future is expected to be able to useful.

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