• Title, Summary, Keyword: 고속철도교량

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Prediction of the Environmental Noise Level of Railway Cars Crossing a Concrete Bridge (콘크리트교를 지나는 철도 차량의 환경 소음 예측 연구)

  • Jang, Seungho
    • The Journal of the Acoustical Society of Korea
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    • v.34 no.1
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    • pp.52-59
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    • 2015
  • In the conventional model for the prediction of the railway environmental noise, one used an empirical formula of the total noise level at specific distances. Only a function of the distance to the source was also used to calculate the noise level near the railway bridges. However, the noise varies depending on the position of the receiver as well as the distance from the source especially at concrete bridges. In this paper, a noise propagation model in the railway concrete bridge was derived by considering the diffraction at the bridge deck and the ground effect and applying the ISO 9613-2 noise propagation model. We compared the predicted and measured values of environmental noise at a high-speed railway bridge, and it was confirmed that this prediction model gives relatively small errors.

Cost Reduction of Construction of Bridges for the High-Speed EMU (동력분산형 고속철도의 교량형식에 따른 교량건설비용 저감방안 연구)

  • Lee, Tae-Gyu;Kim, Hye-Uk
    • Proceedings of the KSR Conference
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    • pp.1195-1200
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    • 2008
  • The railway bridge design specification used in our country at present, is reflected results that take into account link between vehicle and roadbed according to decision of TGV vehicle style in 1994, and executes design verification. Hereafter, the particular loading condition and the design speed of the high-speed EMU that is recognized to the next generation of high speed railway, are plain difference with TGV vehicle style decided in 1994. The effect that these load and design speed get in roadbed, especially superstructure, displays difference with the existent high speed railway. The goal of this study is to choose the suitable bridge type, and to reduce the construction cost for the next generation of railway, i.e., the high-speed EMU.

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Dynamic Behavior of KTX Bridges Using Field Test Data (현장계측자료를 이용한 고속철도교량의 동적거동특성)

  • Yim Myoung Jae;Choi Il Yoon;Lee Jun S;Lee Hyun Suk
    • Proceedings of the KSR Conference
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    • pp.563-568
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    • 2003
  • High-speed railway bridges subject to effect of dynamic loads by interaction between vehicle load which run specially fast and behavior of bridges. Such dynamic load effects result in fluctuations and fatigues to each elements as well as whole conduct of bridges. and is influenced in life of bridges. For these reason. Analysis and estimation of data about dynamic behavior of bridges occupies important factor in that estimate the remaining life of bridges and select the maintenance. repair and retrofit. In this paper. Analysis for the dynamic behavior of bridges using displacement and acceleration data that is actuality measure data to the bridges of Seoul-Susan high speed railroad test section has been made.

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Performance Verification for High Speed Railway Bridge on Test Operation of KTX (KTX 시운전시 고속철도 교량의 성능검증)

  • Na Sung Hoon;Yang Sin chu;Lee Jee Ha;Son Ki Jun
    • Proceedings of the KSR Conference
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    • pp.477-482
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    • 2003
  • The railway bridges on the new high-speed line are the first structures designed and constructed by our local engineers for high-speed running. In securing running stability and riding comfort in high-speed running, it is very important to verify the performance of structures and local specifications and design criteria by measuring and analyzing the dynamic behavior of main structural members. In this study, 4 different types(simple-span, 2, 3, 4-continuous spans) of PCS Box bridges on the test line(Yongwa$\~$Simok section) were selected, each representing a different type of superstructures, in order to verify the performance of the bridges by measuring dynamic responses during the test-run of KTX. Reviews of the running stability and the riding comfort were carried out with the results of the measurement and the analyses of vibration acceleration, endrotation, distortion and deflection at midspan.

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3-D Frame Analysis Using Refined Plastic Hinge Analysis Accounting for Non-Proportional Loading (비비례하중을 고려하는 개선소성힌지 해석을 이용한 3차원 강뼈대 구조물의 해석)

  • 김창성;김승억;주환중
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.77-84
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    • 2003
  • In this paper, the refined plastic-hinge analysis accounting for the effect of strain reversal caused by non-proportional loading is developed. This analysis accounts for material and geometric nonlinearities of the structural system and its component members. Moreover, the problem, conventional refined plastic-hinge analyses have underestimated the strength of structures subjected to non-proportional loading, is overcome. The modified stiffness degradation model approximating the effect of strain reversal is discussed in detail. The proposed analysis is verified by the comparison of the finite element analysis. A case study shows that the effect of strain reversal is a very crucial element to be considered in second-order plastic-hinge analysis. The proposed analysis is shown to be an efficient, reliable tool ready to be implemented into design practice.

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The Effect and Countermeasures of The Vertical Track Settlement Caused by Expand and Contract Behavior of the High-Speed Railway Bridge Girder (고속철도 교량상판의 온도신축작용이 궤도처짐에 미치는 영향과 대책에 관한 연구)

  • 강기동
    • Journal of the Korean Society for Railway
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    • v.7 no.3
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    • pp.283-289
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    • 2004
  • According to continuos welded rails on a bridge, temperature changes bring about the expansion of the bridge deck adding axil forces on the track. Moreover, the ballast on the bridge deck expansion joint is moved due to the bridge deck. If bridge decks are longer, the influence is greater, loosening ballast, causing track irregularities, and deteriorating passengers' comfort. Considering structure of bridge itself and tolerance of track irregularities caused by the loosened ballast on bridges, the maximum length of a deck should be less than 80m, which is the same as the standard of the French railway. In this study, an interaction between the expansion related to the bridge length and irregularity in longitudinal level referring to measurements and maintenance works performed in the high-speed railways was analyzed. This research shows that installation of sliding plate or vertical ballast stopper is not a good option since it is difficult to install. On the other hand, installation of movable fastener or gluing is easy but its influence is insignificant. To conclude, switch tie tamping or manual tamping is more effective than others.