• Title, Summary, Keyword: 고속철도교량

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A Model for Simplified 3-dimensional Analysis of High-speed Train Vehicle (TGV)-Bridge Interactions (고속철도차량(TGV)-교량 상호작용의 단순화된 3차원 해석모델)

  • 최창근;송명관;양신추
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.13 no.2
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    • pp.165-178
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    • 2000
  • The simplified model for 3-dimensional analysis of vehicle-bridge interactions is presented in this study. By using the analysis model which includes the eccentricity of axle loads and the effect of the torsional forces acting on the bridge, the more accurate analysis results of the behavior of the bridge can be obtained. The equations of kinetic energy, potential energy and damping energy are expressed by degrees of freedom of the vehicle and the bridge. And then by applying Lagrange's equations of motion, the equations of motion of the vehicle and the bridge are obtained. By deriving the equations of forces acting on the bridge considering the vehicle-bridge vertical interactions and also by identifying the position of vehicle as time goes by, mass matrix, stiffness matrix, damping matrix and load vector of vehicle-bridge system are constructed in accordance with the position of vehicles. Then using Newmark's β-method(average acceleration), the equations of motion for the total vehicle bridge system are solved.

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Analysis of Design Live Load of Railway Bridge Through Statistical Analysis of WIM Data for High-speed Rail (고속철도 WIM 데이터에 대한 통계분석을 통한 철도교량 설계활하중 분석)

  • Park, Sumin;Yeo, Inho;Paik, Inyeol
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.6
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    • pp.589-597
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    • 2015
  • In this paper, the live load model for the design of high-speed railway bridge is analyzed by statistic and probabilistic methods and the safety level that is given by the load factors of the load combination is analyzed. This study is a part of the development of the limit state design method for the railway bridge, and the train data collected from the Gyeongbu high-speed railway for about one month are utilized. The four different statistical methods are applied to estimate the design load to match the bridge design life and the results are compared. In order to examine the safety level that the design load combination of the railway bridge gives, the reliability indexes are determined and the results are analyzed. The load effect from the current design live load for the high-speed rail bridge which is 0.75 times of the standard train load is came out greater than at least 30-22% that from the estimated load from the measured data. If it is judged based on the ultimate limit state, there is a possibility of additional reduction of the safety factors through the reliability analysis.

Field Tests and Resonance Behavior Corresponding to the Damping Ratio of a High Speed Railroad Bridge (고속철도 교량의 현장실험 및 감쇠비 개선에 따른 공진 시 동적응답의 분석)

  • Kim, Sungil;Kim, Hyunmin;Park, Donguk
    • Journal of the Korean Society for Railway
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    • v.16 no.4
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    • pp.305-310
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    • 2013
  • In general, it is difficult to measure dynamic responses of a bridge with stepwise increasing speed of a train during commercial service on a high speed railroad. However, before opening the 2nd stage of the Gyeongbu high speed railroad, there was an opportunity for field tests and measurements of the bridge with stepwise increasing speed(from 170km/ h to 315km/h). The measured responses were compared with the results of a developed bridge/train interaction analysis. Although good agreement was found throughout almost the entire range of speeds, relatively large differences were found in the vicinity of the critical speed at which resonance behavior of the bridge occurs. To investigate the cause of this, reanalyses are performed with re-estimated damping ratios from field tests.

A Study on Acceleration of High-Speed Railway Bridges According to Type of Track (고속철도교량의 도상 종류에 따른 가속도 비교)

  • 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.849-852
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    • 2011
  • Dynamic response of high-speed railway bridges is important due to the possibility of resonance from continuous and repeated action of high-speed train running. Acceleration of bridge deck is important parameter in the evaluation of dynamic stability of bridges. This study investigated acceleration characteristics according to type of tracks.

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Comparison of Girder Height and Construction Cost by Span in Various Types of Railway Bridge (철도교량형식의 경간에 따른 형고 및 공사비 비교연구)

  • Lee, Tae-Gyu;Oa, Seong-Wook
    • Journal of the Korean Society for Railway
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    • v.11 no.5
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    • pp.471-476
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    • 2008
  • The superstructure type of the railway bridge in our country, is mainly classified into the box girder and the I-type girder. The box girder is widely used in the high speed railway bridge because of the safety due to dynamic behavior. The I-type girder is used in the conventional railway bridge, and is also divided into the general type and the composite type, and the newly modified types have been developed. According to the current railway bridge design code, the girder design by the span length in various types of railway bridge is performed in is study. The suitable girder height and the construction cost by the span length are analyzed, and the comparative analysis of the structural efficiency and the economical efficiency is carried out. From this study, the composite type girder is appeared the good result in respect of the structural efficiency. However, in the economical aspect, the general I-type girder is required less cost than the other types.

Verification Study of Train/Bridge Interaction Analysis through Field Tests of a High Speed Railway Bridge (고속철도 교량의 속도별 주행시험을 통한 교량/열차 상호작용해석의 검증)

  • Kim, Sung-Il;Lee, Joo-Beom;Kim, Hyun-Min;Lee, Hee-Up
    • Proceedings of the KSR Conference
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    • pp.1555-1561
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    • 2011
  • The dynamic behavior of a bridge under moving loads has been investigated over many years. Especially, with the introduction of High Speed Railway, numerous theoretical studies on the interaction problem between bridges and trains are carried out. In the present study, advanced bridge/train interaction analyses are performed and compared with field tests of a simply-supported 40m long PSC box girder bridge of Kyung-Bu High Speed Railway. Vertical displacements and vertical accelerations of a bridge with increasing speeds are analyzed. In addition, wheel load reduction rates and accelerations of a car-body of the train are investigated for a study of appropriateness of traffic safety criteria of bridge design specification.

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Comparison of Efficiency by Span in Various Railway Bridge Types (철도교량형식의 경간에 따른 효율성 비교연구)

  • Lee, Tae-Gyu
    • The Journal of the Korea Contents Association
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    • v.14 no.7
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    • pp.511-517
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    • 2014
  • The superstructure type of the railway bridge in our country, is mainly classified into the box girder and the I-type girder. The box girder is widely used in the high speed railway bridge because of the safety due to dynamic behavior. The I-type girder is used in the conventional railway bridge, and is also divided into the general type and the composite type, and the newly modified types have been developed. According to the current railway bridge design code, the girder design by the span length in various railway bridge types are performed in this study. The suitable girder height by the span length are analyzed, and the comparative analysis of the structural efficiency and the economical efficiency is carried out. From this study, the composite type girder is appeared the good result in respect of the structural efficiency. However, in the economical aspect, the general I-type girder is required less cost than the other types.

Evaluation of Train Running Safety During Construction of Temporary Bridge on Existing Railway (기존선에서 가설교량 시공에 따른 열차의 주행안전성 평가)

  • Eum, Ki-Young;Bae, Jae-Hyoung;Choi, Chan-Yong
    • Journal of the Korean Society for Railway
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    • v.14 no.3
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    • pp.234-239
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    • 2011
  • Installing the temporary bridge after excavating the railway requires installing movable cross beam, but as it doesn't requires isolating the catenary or cutting the rail, it's applicable to double-track with frequent operation. In this study, a displacement meter was placed on temporary bridge to monitor the displacement pattern in curve section (R400) completed using temporary bridge method, and wheel load, lateral pressure and derailment coefficient were measured to evaluate the load imposed on track and the stability in curve section (R400) for quantitative evaluation of training running safety. As a result of the measurement, when trains passing over a temporary bridge, the maximum value of Wheel load and Lateral Force is analyzed as the 51% and 81% of standard level according to foreign country's performance tests, There is no trouble with stability analysis in Wheel load and Lateral Force occurring. Additionally, Wheel load and Lateral Force considered as the safety standard are tested 49% of limiting value regardless of trains, which the norm value quite well, there is no problem with train running.