• Title, Summary, Keyword: 고속철도교량

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Analysis of Rail Stress on Diversity of Railway Bridge Sustem (고속철도 교량의 구조 시스템 변화를 고려한 교량상 장대레일의 응력 해석)

  • Kang, Jae-Yoon;Kim, Byung-Suk;Kwark, Jong-Won;Chin, Won-Jong
    • Proceedings of the KSR Conference
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    • pp.3160-3165
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    • 2011
  • The track and bridge interaction should be considered for the safety check of railway bridge design as the longitudinal forces transmitted to rail and bridge are changed by longitudinal stiffness of bridge system. The longitudinal stiffness of bridge structures is determined by the magnitude of the ballast resistance, the expansion length of superstructure, and longitudinal stiffness of substructure including pier and foundations. In this study, the main factors affect on the longitudinal rail forces are discussed and the computational parametric analysis of rail forces considering rail-bridge interactions. And the required range of stiffness of sub-structures and span length for the assurance of safety of CWR(continuous welded rail) track is suggested.

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전산수치해석의 고속철도에의 활용

  • 이승원;양재성
    • Computational Structural Engineering
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    • v.9 no.3
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    • pp.54-59
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    • 1996
  • 시속 300km로 주행하는 고속철도 열차의 주행안정성 및 승차감을 확보하기 위해서는 열차하중을 고려한 정교한 정적, 동적해석 및 설계가 이루어져야 한다. 따라서 차량과 궤도의 동적상호작용 및 차량과 교량의 동적상호작용, 터널의 미기압 및 공기압, 대단면 터널굴착의 안정성평가, 열차주행에 의한 지반진동의 예측 등에 전산수치해석기법의 활용 및 개발이 현재 활발히 이루어지고 있다. 그러나 고속철도 보유국을 포함한 선진국들에 비하면은 이러한 전산수치해석분야에 있어서 아직도 더 많은 연구 및 개발이 본 공단을 포함하여 학계 및 연구소에서 이루어져야 하겠으며, 본 경부고속철도 건설사업으로 인하여 차량, 전기시설분야의 각종 첨단기술개발 및 발전과 더불어 하부 토목구조물의 건설 및 설계 해석분야에 많은 발전이 기대된다 하겠다.

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Dynamic Characteristics of Simply Supported Single Span Bridges for KTX and HEMU using Design Diagram (설계다이어그램을 이용한 KTX와 HEMU 차량 주행시 단경간 단순지지 교량의 동특성 분석)

  • Cho, Jeong-Rae;Cho, Keunhee;Kwark, Jong-Won;Kim, Young Jin
    • Journal of the Korean Society for Railway
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    • v.15 no.5
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    • pp.498-507
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    • 2012
  • This paper presents the ERRI design diagrams of KTX and HEMU applicable to simply supported single span bridges, and analyzes the dynamic characteristics and design considerations of the bridges under KTX and HEMU using the diagrams. The design diagrams of KTX and HEMU are calculated for the bridges with 25m, 30m, 35m and 40m span lengths, which are widely used for simple bridge in Korea. From the design diagrams, the dynamic characteristics of the bridges with the selected span lengths are analyzed. In addition, the design consideration is discussed to satisfy the design requirement of acceleration. It is desirable for the bridge with 25m span length to avoid resonance both for KTX and HEMU. Since larger responses are expected for HEMU in the bridge with 30m span length, and for KTX in the bridge with 35m and 40m span length, the bridges should be planned to have enough mass satifying acceleration requirement at resonance, or to avoid the resonance.

Corrosion Fatigue Reliability-Based Life Cycle Cost Analysis of High-Speed Railway Steel Bridges (고속철도 강교량의 부식 피로신뢰성 기반 생애주기비용 분석)

  • Cho, Hyo-Nam;Jeon, Hong-Min;Sun, Jong-Wan;Youn, Man-Keun
    • Journal of the Korean Society for Railway
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    • v.11 no.1
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    • pp.107-113
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    • 2008
  • As it recently appears that LCC (Life Cycle Cost) analysis may be considered as an essential method for economic evaluation of infrastructures. Many researches have been made to assess LCC of each facility based on reasonable methods. However, expected maintenance repair cost must be reasonably estimated to enhance the reliability of LCC analysis through systematic and rational methods. This study is intended to propose a rational approach to reliability-based LCC analysis of high-speed railway steel bridges considering lifetime corrosion and fatigue damage. However in Korea, since high speed railway steel bridges are only recently constructed, no direct statistical data are available for the account of the maintenance cost and thus their maintenance characteristics are not clear yet. In this paper, for the assessment of expected maintenance/repair cost, the fatigue system reliability analysis incorporating the corrosion effect is proposed by considering the corrosion and fatigue damage using measured data of high speed railway steel bridges. A model proposed by Rahgozar, of at for fatigue notch factor considering the corrosion effect is used in order to incorporate the corrosion effect into the fatigue strength reduction and S-N curve. Finally, the effectiveness of LCC model proposed for high-speed railway steel bridges is demonstrated by a numerical example.

Characteristics of Track and Train Behaviors on High-Speed Railway Bridge/Earthwork Transiton Zone (고속철도 교량/토공 접속부에서의 궤도 및 차량 거동 특성)

  • Lee, Il-Wha;Kang, Yun-Suk;Kim, Eun;Son, Ki-Jun;Park, Chan-Kyoung
    • Proceedings of the KSR Conference
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    • pp.129-134
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    • 2003
  • It is very important to pay careful attention to construction of bridge/earthwork transition zone for high-speed railway. The transition zone of the railway is the section which roadbed stiffness is suddenly varied. Differences in stiffness have dynamic effects and these increase the forces in the track and the extent of deformation. An abrupt change of stiffness across two adjacent track portions cause irregular settlement of roadbed, track irregularity, lack of girder bending moment and reduction of lateral resistance. Especially on high-speed railway, track irregularity of transition zone cause sincere effect to track stability and train safety. And so continuous maintenance is needed. To verify this effect and to improve transiton zone capacity, In situ test, track irregularity and train acceleration test were performed on high-speed railway bridge/earthwork Transiton Zone.

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Verification Study of Moving Load Simulation Test in Railroad Bridge (철도교량 주행하중 재현 시험 검증)

  • Kim, Hyun-Min;Kim, Sung-Il;Kim, Tae-Hoon
    • Proceedings of the KSR Conference
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    • pp.1562-1568
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    • 2011
  • This paper is intended as an verification of moving load simulation techniques. The concern with dynamic problem of railway bridge caused by the moving train loads has been growing. Over the past few years, several studies have been made on dynamic stability of railway bridge analytically. But very few attempts have been made at experimental research. From the dynamic stability view point, the moving train loads simulation test is revolutionary idea. It can be replace restrictive filed test with new laboratory test. This study investigates minimum specifications of hardware and basic parameters. it is used 12m girder and high performance actuator for experimental verification.

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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.

Assessment of Fragility Curve for Earthquake in Railway Bridge (기존 철도교량의 지진에 대한 취약도 곡선 산정)

  • Kim, Dae-Ho;Sun, Chang-Ho;Kim, Ick-Hyun
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.101-104
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    • 2008
  • Recently, the serious damage by earthquakes is increased around the world. SOC fo city is established to minimize the loss of lives and assets by earthquakes, which an objective standard is required. Generally, bridges damage by earthquakes occurred the inelastic hinge under the column. Nonlinear element model of inelastic hinge have been used to Bilinear model, but Takeda model for material characterization of concrete is a little. In this study, railway bridge was performed seismic fragility analysis for Takeda model and Bilinear model comparatively. This analysis shows that damage probability of Takeda model is larger than Bilinear model. And analysis of Takeda model in longitudinal direction and transverse direction are different. Therefore developed analysis for concrete column of bridge is expected to apply to material characterization.

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A Correlation Analysis on Earth Pressure and Subgrade Stiffness in Bridge Abutment Transition Zone (철도 교량접속부의 토압과 노반강도와의 상관관계)

  • Kim, Jin-Hwan;Cho, Kook-Hwan
    • Journal of the Korean Society for Railway
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    • v.19 no.5
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    • pp.647-655
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    • 2016
  • The construction of high speed railways and improvement projects of for conventional railways require straight railway lines of railway, which leads to an increase of bridge and tunnel construction. Transition zones in railways means that the track support stiffness is variedvaries in over short ranges. Sspecial attention is required in theose transition zones since because instability of train running in train and irregularities of track irregularities are can frequently occurred. Typical transition zones are between bridges and earthworks and between tunnels and earthworks. On In a transition zone, a bridge abutment transition zone has many problems in with various causes. In this paper, fundamental problems of bridge abutment transition zones is are analyzed to enhance the understanding about of bridge abutment transition zones. Suggestions for improving problems in the transition zones are proposed.

Field Test to Investigate the Thermal Stress of Continuous Welded Rail on High Speed Railway Bridges in Summer Period (고속철도 교량상 장대레일의 하절기 온도응력 계측)

  • Kwark, Jong-Won;Choi, Eun-Suk;Chin, Won-Jong;Lee, Jung-Woo;Kim, Byung-Suk;Kang, Jae-Yoon
    • Journal of the Korean Society for Railway
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    • v.9 no.2
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    • pp.131-136
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    • 2006
  • Most modern railways, especially the high speed railway tracks, use continuous welded rail(CWR) for the less maintenance. For the CWR track has very few expansion joints, track buckling has always been an unpredictable event and it happens mainly by high compressive stress in rail in summer period. Therefore, it is important to understand the variation of rail stress induced by thermal loads which has direct influence on the rail buckling and stability of railway track. This paper describes the experimental investigation of the variation of rail temperature and stress in a high speed railway track on bridge structure. Field measurement was performed to examine the correlation between the rail temperature and rail stress on the Korean High Speed Railway line. Regression functions were derived from measured data to determine the rail stress f3r an arbitrary rail temperature varies from 20 to 50 degree Celsius.