• Title, Summary, Keyword: 고속철도교량

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Experimental Study on the Variation of Track Stiffness between Earthwork and Bridge (교량 토공 접속부에서 궤도강성변화에 대한 실험적 연구)

  • 나성훈;서사범;손기준;김정환
    • Proceedings of the KSR Conference
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    • pp.281-288
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    • 2001
  • In order to evaluate the effect of impact load at support stiffness transition area, the field estimations are performed at the transition zone between earthwork and bridge on test operation of KTX. Due to differential settlement caused by the variations of track support stiffness, large impact forces are investigated. However, the measured values such as wheel load, rail stress, displacement and acceleration in the transition area shows that the stiffness changes in the transition area are not abrupt, and the stiffness in the infra track structure varies continuously. In this experimental study, the parameters influencing safety of transition area are not governed by partial or local stiffness because cumulative passing loads are not sufficient on test operation of KTX.

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Dynamic Performance Evaluation of New Type PSC Railroad Bridges (신형식 PSC 철도교량의 동적성능 평가)

  • Choi, Sanghyun
    • Journal of the Society of Disaster Information
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    • v.7 no.4
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    • pp.259-265
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    • 2011
  • After the commercial opening of the KTX in 2005, the high speed railroad has been rapidly emerged as the major transportation means due to its high energy efficiency. Recently, the government has announced its plan to build the future transportation system around the high speed railroad. Based on this policy, the existing lines as well as the lines under construction or design are planning to increase design speed. In this paper, the suitability of the mid-span PSC girder bridges for the high speed railroad is evaluated via dynamic analysis. IT, Precom, and WPC girder bridges are considered for the purpose of this study and, for comparison, the identical modeling method and the analysis technique are utilized. The performance indices used for dynamic performance evaluation are the natural frequency, the vertical displacement, the end axial displacement, track irregularity, etc. The KTX train is utilized as a dynamic load, and the dynamic analysis is performed up to the train speed of 420km/hr with the increment of 10km/hr.

Long-Rails Stress Analysis of High-Speed Railway Continuous Bridges Subject to Operating Basis Earthquake (사용지진을 고려한 고속철도 연속교 장대레일의 응력 해석)

  • 김용길;권기준;고현무
    • Journal of the Earthquake Engineering Society of Korea
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    • v.6 no.5
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    • pp.59-66
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    • 2002
  • Long-rails in railways and high-speed railway are subjected to additional stresses resulted from the displacements inconsistence between upper structures, and this phenomenon is more remarkable in continuous bridges than in simple bridges. For the sake of safety, railways have to guarantee trains to stop safely without derailment even in the event of earthquake. The influences of acceleration, braking, and temperature were analyzed by static nonlinear method. But earthquake loads that require dynamic nonlinear analysis are not considered in these methods. Because linear relation between relative displacements of decks and rail stresses is not guaranteed at the nonlinear systems such as long rails on the bridges, it is required compute to rail stresses considering both braking and earthquake load by nonlinear dynamic analysis method. In this study, dynamic analysis method with material non-linearity for rails on continuous bridges according to the Taiwan High Speed Railway(THSR) Design Specification volume 9 was developed. And additional stresses and displacements of long rails for acceleration, braking, and earthquake loads were analyzed by this method.

Development of Integrated Monitoring Middleware System for 400km/h High Speed Railway Measurement Data (400km/h급 고속철도 계측데이터 통합 모니터링 미들웨어 시스템 개발)

  • Hwang, KyungHun;Na, JunSu;Song, ByungKeun;Yang, OKYul
    • Convergence Security Journal
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    • v.13 no.6
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    • pp.61-68
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    • 2013
  • Needs for a new technologies of infrastructure systems arose, following the development of next generation EMU(Electric Multiple Unit) train with maximum speed over 400km/h. For high-speed operation tests of the new EMU, a high-speed railway infrastructure test-bed was constructed in a 28km long section of the Honam High-speed Railway. Diverse sensors and monitoring system was installed for continuous monitoring of the railway. Due to such effort, further demands and needs of the integrated monitoring system was derived in a more comprehensive and long-term perspective.

A Study on the Effects of a High-Speed Railway Bridge Vibration induced by Moving Train on the Adjacent Bridge (열차주행에 의한 고속철도 교량의 진동이 인접 교량에 미치는 영향에 관한 연구)

  • Kim Sung-Il;Lee Jang-Seok
    • Proceedings of the KSR Conference
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    • pp.900-905
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    • 2004
  • A study on the effects of a high-speed railway bridge vibration induced by moving train on the nearby bridge is performed. Longitudinal and lateral accelerations of slabs and piers which are calculated from moving load analysis of a high-speed railway bridge can be used as input ground motions for the adjacent bridge. Dynamic responses of the adjacent bridge considering soil-structure interaction effects are analyzed by sub-structure method. Analysis procedure is made of free field analysis, calculation of impedance and effective input load and soil-structure system analysis.

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Reliability-Based Assessment of Structural Safety of Regid-Frame-Typed Segmental PSC Box Girder Bridges Erected by the FCM during Construction (FCM에 의한 라멘식 세그멘탈 PSC박스거더 교량의 신뢰성에 기초한 시공간 구조안전도평가)

  • Cho, Hyo-Nam;Joo., Hwan-Joong;Park, Kyung-Hoon;Moon, Kyung-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.1
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    • pp.131-140
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    • 2002
  • In this paper, a limit state model based on the analysis of structural behavior of segmental prestressed concrete box girder bridges and reliability-based safety assessment method are proposed for the bridges erected by free cantilever method. Strength limit state models for prestressed concrete box girder and rigid-frame type columns are developed for a structural safety assessment during construction. Based on the proposed limit state models, the reliability of the bridge is evaluated by using the Advanced First Order Second Moment method. The proposed model and method are applied to the Seo-Hae Grand Bridge built by FCM in order to verify its effectiveness in the safety assessment during construction of the kind of bridges. The sensitivity analyses of the main parameters are also performed in order to identify the important factors that need to be controlled for the safety of the bridges during construction.

A Study on Hydration Heat and Dry Shrinkage of High Durability / Strength Concrete for the Bridge Slab of Express Railway (고속철도 교량상판 슬래브용 고내구/고강도 콘크리트의 수화열 및 건조수축 특성 개선연구)

  • 박정준;백상현;정재헌;박경재;윤원기;엄태선
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.725-728
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    • 1999
  • The bridge slab of express railway was designed for high strength concrete (design strength 400kgf/$\textrm{cm}^2$). In case the slab is made with the concrete using type I cement, used much amount of cement can cause cracks through concrete by hydration heat or dry shrinkage. In this study we targeted to solve above problems using type III cement. We could decrease the cement ratio in concrete using type III cement than type I cement. The concrete using type III cement showed good workability and compressive strength, and showed better properties in hydration heat and dry shrinkage than that using type I cement

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Dynamic Characteristics of High-speed Railway Steel Bridges (고속철도 강교량의 진동특성 분석)

  • Lee, Jung-Whee;Kim, Sung-Il;Kwark, Jong-Won;Lee, Pil-Goo;Yoon, Tae-Yang
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.7
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    • pp.632-637
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    • 2007
  • The dynamic behavior of two steel bridges crossed by the Korean High Speed Train(KHST) has been investigated experimentally and the results are compared with the specification requirement of BRDM and other typical PSC Box bridge's responses. The investigated bridges are a 2-girder steel bridge of 1@40m span length(E-Won Bridge), 2@50m span length (Ji-Tan Bridge), and a PSC Box girder bridge of 2@40m span length (Yeon-Jae Bridge). A set of experimental tests were performed during operation of KHST, and a number of accelerometers, LVDTs and ring-type displacement transducers were utilized for measurement of three kinds of dynamic responses (acceleration, deflection, and end-rotation angle). Measured responses show that the vertical deflections and end-rotation angles of the three bridges are all satisfying the spec. requirement with large margin, but it was also found acceleration responses which are very close or exceed the limit value. Most of the excessive acceleration responses were found when the passing velocity of the KHST is close to the critical velocity ($V_{cr}$) which causes resonance. No noticeable differences of dynamic responses due to the different materials(steel or concrete) could be found within these experimental results.

Sound Reduction of the high-speed railroad noise by the deck plate of the Bridge (고속철도에서 교량상판의 소음저감효과)

  • 김준엽;나희승
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.139-144
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    • 2001
  • Railroad noise is one of the main causes of environmental impact. Whenever a new railroad line is planned or a housing project near an existing railroad is proposed, an estimate of the relevant noise levels is usually required. For this, it is necessary to quantify those parameters that affect the railroad noise. This paper deals with an estimation of railroad noise by the barrier and deck plate of the bridge.

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