• Title/Summary/Keyword: 레일교량상호작용

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

  • 강재윤;김병석;김영진;박성용;조정래;최은석;진원종
    • Journal of the Korean Society for Railway
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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.

Stability Analysis for CWR on the Railway Bridges by Linearized Method (선형해석법을 이용한 교량상 장대레일의 안정성 해석 방법 연구)

  • Choi, Young-Gil;Oh, Ju-Won
    • Journal of the Korean Society for Railway
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    • v.12 no.4
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    • pp.472-480
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    • 2009
  • The stability analysis for CWR is difficult in the theory itself because both geometric and material nonlinearity should be considered. Also the analysis results are varied according to the loading history. In contrast to the complexity in the theory, the analysis results for CWR on the railway bridges are quite simple and can be predicted because of a small buckling effect and its negligible nonlinearity. In this study, refined nonlinear analysis methods for the stability analysis of CWR on the railway bridges were developed which consider only material nonlinearity beeause the effects of geometric nonlinearity are nominal. In this study, the analysis results can be found within limited number of iterations with idealized linear force-displacement relationship. From the analysis result comparisons, it was found that the stability analysis for CWR on the railway bridges can be performed effectively by this method.

Parametric Study on Rail and Bridge Interaction (레일과 교량의 상호작용 매개변수 분석 연구)

  • Kim, Jong-Min;Han, Sang-Yun;Lim, Nam-Hyoung;Kim, Jung-Hun;Kang, Young-Jong
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.445-450
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    • 2007
  • CWR(Continuous Welded Rail) and bridge interaction produce rail force, bridge displacement and rail/bridge relative displacement. Each of these has limitation by many codes. In this paper, analysis of interaction has been carried out by using foreign codes(UIC 774-3 R code of Europe etc.) because there is no code about interaction between rail and bridge in Korea. Recently, railway bridges with CWR has been constructed for structural and economical reasons. When designer plans railway bridges, design a bridge model first and then investigate railway forces and displacement by interaction analysis. If these results go out bounds from limitation, designer plans railway bridges again and again. In this paper, using the parametric study on CWR and railway bridge interaction, railway bridge parameters such as length of bridge span, area of bridge, moment of inertia, stiffness of pier, etc. are presented. It helps preliminary design of railway bridges.

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Parametric Study on Properties of bridge by CWR(Continuous Welded Rail) and Bridge Interaction Analysis (장대레일과 교량의 상호작용 해석을 통한 교량제원 매개변수 분석)

  • Kim, Jong-Min;Han, Sang-Yun;Lim, Nam-Hyoung;Kang, Young-Jong
    • Proceedings of the KSR Conference
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    • pp.1460-1465
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    • 2007
  • CWR(Continuous Welded Rail) and bridge interaction produce rail force, bridge displacement and rail/bridge relative displacement. Each of these has limitation by many codes. In this paper, analysis of interaction has been carried out by using foreign codes(UIC 774-3 R code of Europe etc.) because there is no code about interaction between rail and bridge in Korea. Recently, railway bridges with CWR has been constructed for structural and economical reasons. When designer plans railway bridges, design a bridge model first and then investigate railway forces and displacement by interaction analysis. If these results go out bounds from limitation, designer plans railway bridges again and again. In this paper, using the parametric study on CWR and railway bridge interaction, railway bridge parameters such as length of bridge span, area of bridge, moment of inertia, stiffness of pier, etc. are presented. It helps preliminary design of railway bridges.

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Analysis of Rail Force considering Rail/Bridge Interation (레일/교량 상호작용을 고려한 레일축력 해석)

  • 김병석;김영진;강재윤
    • Proceedings of the KSR Conference
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    • pp.71-78
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    • 1998
  • Recently, continuous welded rail (CWR) track has been adopted for railway track structure of great advantages of reducing maintenance costs, and of increasing life time of track components and the comfort of passengers. But, in this case, a temperature or mechanical load will result in high stress and the track breakage or buckling may occur Especially when the CWR is laying on the bridge structure, the relative displacement of these structure can be increased and this results in the instability of track. In this paper, the main factors affect on the longitudinal rail force are discussed and the computer program is developed for the analysis of rail force considering the interactions with sub-structure.

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Field Test on the Rigidities of Substructures of High Speed Railway Bridges (고속철도교량 하부구조 강성도에 관한 현장실험)

  • Chin Won-Jong;Choi Eun-Suk;Kwark Jong-Won;Kang Jae-Yoon;Cho Jeong-Rae;Kim Byung-Suk
    • Journal of the Korean Society for Railway
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    • v.9 no.1
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    • pp.118-124
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    • 2006
  • SThe rigidities of bridge substructures are the important data in the rail-bridge interaction analysis in Korean High -Speed Railway. This experimental study is being performed because of followings. 1) More correct longitudinal stiffness of the structure including substructure should be considered in the calculation of stresses in rails. 2) There are many uncertainties in the design and construction of the piers and foundations. 3) Actual guideline for the rigidities of piers and foundations in the design is necessary. 4) Measurement on the rigidity of pier according to the types of piers, foundations and soil-conditions is needed. Curve for estimating the total rigidity of substructure will be obtained through this and further experimental studies. It may be used in the analysis of Korean High-Speed Railway bridge and then, longitudinal stresses in the rails can be estimated more accurately. One pair of piers, which consist of pot-bearing for fixed support and pad-bearing for movable support, are loaded by steel frame devices with steel wire ropes and hydraulic jack. The responses which are measured at each loading stages in those field tests are displacements and tilted angles on the top and bottom of piers. This study is being performed testing and analysis about several piers in the construction field.