• Title, Summary, Keyword: 플로팅 슬래브 궤도

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Strength Analysis of Joints in Floating Slab Track (플로팅 슬래브궤도 연결부의 강도 분석)

  • Kwon, Ku-Sung;Chung, Won-Seok;Jang, Seung-Yup
    • Proceedings of the KSR Conference
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    • pp.375-381
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    • 2011
  • The passage of railway vehicles generates mechanical vibrations and noises. This problem can be mitigated by the 'floating slab track' that isolating from infrastructures by installing vibration isolator in the concrete slab track. In the previous researches, adjacent floating slab tracks are connected by dowel bar system. It has been reported that many dowel bars with less diameter show better load transfer efficiency (LTE) compared to small number of dowel bars with larger diameter under the condition of the same dowel area. In this study, dowel system is further considered as a concrete anchorage system and the design strength of the dowel system was evaluated based on ACI code 318-08 Appendix D. The design strength of dowel system is then verified against failure load test of floating slab system.

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Design of floating Slab according to Dynamic Load (동하중을 고려한 플로팅궤도 슬래브 설계)

  • Park, Sung-Jae;Ma, Chang-Nam;Park, Myung-Gyun;Lee, Du-Hwa;Jo, Su-Ik
    • Proceedings of the KSR Conference
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    • pp.268-272
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    • 2010
  • Recently the construction of railway sections passing the central area of cities and stations under railway lines are increasing, and then it is urgently required to take the countermeasures against the railway vibration and the second-phase noise radiated from it. The most efficient countermeasure, out of technologies developed up to now, is the floating slab track which is the track system isolated from the sub-structure by springs. In other countries, the source technologies for anti-vibration design and vibration isolator - one of key components - have been developed and many installation experiences have been accumulated. However, in Korea, since the system design technology and technologies for key components are not yet developed, the foreign system are being introduced without any adjustment, and the key component, vibration isolator, depends on imports. In this study, floating slab was divided into three spans, $k_{dynamic}$ use by examining reactions and member forces was to ensure safety.

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Analysis of floating Slab Track about Arrangement of Reduction Material of Vibration (방진재 위치에 따른 플로팅 슬래브 궤도의 정적거동분석)

  • Kim, Yong-Jae;Park, Sung-Jae;Jeon, Jung-Su;Park, Myung-Gyun;Lee, Du-Hwa;Park, Man-Ho
    • Proceedings of the KSR Conference
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    • pp.659-662
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    • 2009
  • Railway has been pointed to the efficiency of transportation, rapid transit, and comfortable train ride. the construction of railway near the downtown area and station building are increasing for maximization of utilization and convenience. but the heavy of transportation and rapid transit lead to increase noise and vibration. the noise and vibration of railway may cause the civil appeal, decline in the serviceability and insufficiency of environmental standard. In this study, floating slab system which is one of the solution to avoid noise and vibration in railway has been introduced, and analyzed floating Slab Track into arrangement of reduction material of vibration. As a result of analysis, It was estimated the bearing installation though slab have not a negative factor and terminal arrangement of reduction material of vibration have advantage for static behavior.

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Investigation of Load Transfer Characteristics at Slab Joints In The Floating Slab Track by Equivalent Shear Spring Model (등가 전단 스프링 모델을 이용한 플로팅 슬래브궤도 연결부에서의 하중전달 특성 분석)

  • Jang, Seung-Yup;Ahn, Mi-Kyoung;Choi, Won-Il;Park, Man-Ho
    • Proceedings of the KSR Conference
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    • pp.2838-2843
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    • 2011
  • Recently, the floating slab track that can effectively mitigate the vibration and structure-borne noise is being discussed to be adopted. The floating slab track which is a track system isolated from the sub-structure by vibration isolators. Unsimilarly to conventional track and the slab deflection is large. Therefore, the running safety and ride comfort should be investigated. Especially at slab joint since the load cannot be transferred, the possibility that the dynamic behavior of track and train became unstable is high. Thus, in general dowel bar are often installed at slab joints. To determine the appropriate dowel ratio the load transfer characteristics should be investigated. In this study, dowel bar joint is modeled by equivalent shear spring and this model is verified by comparison with experimental results. Using the proven model, the load transfer efficiency and deflection at slab joint according to dowel ratio, and stiffness and spacing of vibration isolator were examined.

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