• Title, Summary, Keyword: 고속철도교량

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Development of Empirical Fragility Function for High-speed Railway System Using 2004 Niigata Earthquake Case History (2004 니가타 지진 사례 분석을 통한 고속철도 시스템의 지진 취약도 곡선 개발)

  • Yang, Seunghoon;Kwak, Dongyoup
    • Journal of the Korean Geotechnical Society
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    • v.35 no.11
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    • pp.111-119
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    • 2019
  • The high-speed railway system is mainly composed of tunnel, bridge, and viaduct to meet the straightness needed for keeping the high speed up to 400 km/s. Seismic fragility for the high-speed railway infrastructure can be assessed as two ways: one way is studying each element of infrastructure analytically or numerically, but it requires lots of research efforts due to wide range of railway system. On the other hand, empirical method can be used to access the fragility of an entire system efficiently, which requires case history data. In this study, we collect the 2004 MW 6.6 Niigata earthquake case history data to develop empirical seismic fragility function for a railway system. Five types of intensity measures (IMs) and damage levels are assigned to all segments of target system for which the unit length is 200 m. From statistical analysis, probability of exceedance for a certain damage level (DL) is calculated as a function of IM. For those probability data points, log-normal CDF is fitted using MLE method, which forms fragility function for each damage level of exceedance. Evaluating fragility functions calculated, we observe that T=3.0 spectral acceleration (SAT3.0) is superior to other IMs, which has lower standard deviation of log-normal CDF and low error of the fit. This indicates that long-period ground motion has more impacts on railway infrastructure system such as tunnel and bridge. It is observed that when SAT3.0 = 0.1 g, P(DL>1) = 2%, and SAT3.0 = 0.2 g, P(DL>1) = 23.9%.

Evaluation of Deformation Characteristics for Bridge/Earthwork Transition Reinforcement Methods Considering Moving Load (이동하중을 고려한 교량/토공 접속부 보강방안별 변형특성 평가)

  • Lee, Il-Wha;Lee, Sung-Jin;Lee, Su-Hyung;Kang, Tae-Ho
    • Journal of the Korean Society for Railway
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    • v.13 no.3
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    • pp.298-303
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    • 2010
  • The transition zone of the railway is the section which roadbed stiffness is suddenly varied like as tunnel-earthwork, bridge-earthwork and concrete track-ballasted track. There are about 450 tunnel-bridge transition sections on Kyungbu high-speed railway line. It is very important to pay careful attention to construction of these transition zones, in order to secure the train running safety. So, we developed a finite element model of the moving wheel loading to simulate the behavior of bridge-earthwork transitions in this paper. The most distinctive characteristics of the model proposed is to simulate the real wheel behavior on rail. And the main analysis object is to evaluate and compare the deformation characteristics of the transition zone according to the reinforcement methods and length of transition zone which is adopted to high-speed railway. Based on the analysis results, we assessed the effect of the reinforcements on the transition zone of high-speed railway.

Analysis of Bridge Deck Acceleration under the High-speed Train (고속철도열차하중에 의한 교량의 가속도 분석)

  • Yoon, Hye-Jin;Chin, Won-Jong;Choi, Eun-Suk;Kang, Jae-Yoon;Kwark, Jong-Won;Kim, Byung-Suk
    • Proceedings of the KSR Conference
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    • pp.1550-1554
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    • 2011
  • In this paper the effect of frequency domain on the estimation of acceleration of high-speed railway bridges was investigated. Field test was conducted for two bridges. One bridge has ballasted tracks, the other slab tracks. Acceleration and displacement were measured. Effect of filtering on acceleration and displacement was analyzed.

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Design and Construction Method Considering Turnout for High-speed on The Bridge with Concrete Track (콘크리트궤도에 고속분기기 설치를 고려한 교량설계 및 시공기법)

  • Kim, In-Jae;Oh, Sei-Young;Joo, Hwan-Joong
    • Proceedings of the KSR Conference
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    • pp.71-79
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    • 2008
  • The concrete track is being used at the Phase II of the Kyeongbu High Speed Railway and New Constructed Honam High Speed Railway. When it makes a decision of bridge type, It has to consider about longitudinal forces of Continuous Welded Rail, Displacement at the end of bridges, Up-lift forces for fastener on the track. If it is installed turnout on the bridge, There is likelihood of the deck twist by applying the each difference longitudinal forces at the 4 each rails and the buckling by concentration of rail stress at the turnout. Moreover, If it is installed turnout on the continuous bridge and REJ(Rail Expansion Joint) on the main track or turnout track. It is hard to keep a safety for rail because of coming to twist or folding at the expansion of deck on the turnout track. Therefore when it is a design of bridge with turnout. It need to take bridge type to minimize an additional axial force and a displacement at the turnout. This paper makes a study of the composite steel arch bridge that is able to resolve criteria requirements of safety for track with turnout and suggest a helpful design method for bridge considering track with turnout by being based on design and construction method of Eonyang Bridge at the north part of Ulsan Station in Phase II of the Kyeongbu High Speed Railway.

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Fatigue Reliability Evaluation of Steel-Composite High-Speed Railway Bridge with Tuned Mass Damper (동조질량감쇠기를 장착한 강합성형 고속철도교의 피로신뢰성 평가)

  • Kang, Soo-Chang;Seo, Jeong-Kwan;Koh, Hyun-Moo;Park, Kwan-Soon
    • Journal of the Earthquake Engineering Society of Korea
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    • v.9 no.5
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    • pp.1-10
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    • 2005
  • This study proposes a fatigue reliability evaluation procedure for steel-composite high-speed railway bridge based on dynamic analysis and investigates the effectiveness of Tuned Mass Damper(TMD) in terms of the extension of fatigue life of the bridge. For the fatigue reliability evaluation, the limit state is determined using S-N curve and linear fatigue-damage accumulation. Dynamic analyses are peformed repeatedly to consider the uncertainties of train-velocity and damping ratio of the bridge. The distribution of random variables related to fatigue damage for the intended service life is then statistically estimated from analytical results. Finally, the fatigue reliability indices are obtained by means of the Advanced First-Order Second-Moment (AFOSM) method. Through numerical simulation of a steel-composite bridge of 40m span, the effectiveness of TMD on fatigue life of the bridge is examined and the results are presented.

Evaluation of the Structural Behavior Characteristics and Long Term Durability for Transition Track Systems in Railway Bridge Deck Ends (철도교량 단부 전환부 궤도시스템의 구조적 거동특성 및 장기 내구성능 분석)

  • Lee, Kwangdo;Jeong, Incheol;Choi, Jungyoul;Park, Yonggul
    • Journal of the Korean Society for Railway
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    • v.17 no.4
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    • pp.260-269
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    • 2014
  • Transition tracks are an alternative for enhancing the long-term serviceability and durability of concrete track components in railway bridges. The goal of this paper is to investigate the structural behavior for transition track systems of railway bridge deck ends. In this study, the structural behavior of transition tracks such as the variations in static, dynamic, and fatigue behaviors and dynamic properties (natural frequency and damping ratio) are assessed and compared through performing loading tests and finite element analyses using actual vehicle impact loadings. As a result, it is found that the structural behavior of the transition track system is expected to satisfy the actual vehicle impact loading, and the variation in the neutral axis and dynamic characteristics are not affected by the fatigue loading. Therefore, it is inferred that the structural capacity and long-term durability of the transition track system is proven.

Dynamic characteristics of a high-speed railway steel bridge (고속철도 강교량의 진동특성 분석)

  • Lee, Jung-Whee;Kim, Sung-Il;Kwark, Jong-Won;Lee, Pil-Goo;Yoon, Tae-Yang
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.157-160
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    • 2007
  • The dynamic behavior of a steel bridge crossed by the Korean High Speed Train(KHST) has been investigated experimentally and numerically. The bridge is a 2-girder simply supported steel bridge which has 40m of span length. A set of experimental tests were performed during operation of KHST, and 13 accelerometers and 6 LVDTs were utilized for measurement of dynamic responses. Numerical analyses considering bridge-structure interaction were performed for validation of experimental results. Since structural type and dynamic characteristics of the bridge differ from those of the representative concrete box bridge, dynamic behavior of the concerning steel bridge shows differences, but dynamic performances are all satisfying specification requirements.

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