• Title, Summary, Keyword: Concrete Slab Track

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Correlation Analysis Between Crack and TQI in RC Slab Track (철도콘크리트 슬래브 궤도상의 균열과 TQI 상관성 분석)

  • Kwon, Sae Kon;Park, Mi Yun;Kim, Doo Kie;Park, Jae Hak
    • Journal of Korean Society of Disaster and Security
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    • v.5 no.2
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    • pp.71-79
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    • 2012
  • Recently, in the total railroad construction field, the concrete slab track is adapted, not ballast track. Because the ballast track have the characteristics doing the ongoing maintenance and difficult to handle increasing maintenance costs, eventually the concrete slab track is selected as an alternative. However, owing to the hydration heat reactions and temperature affected shrinkage cracks related to concrete itself, a variety of studies to solve maintenance problems related to concrete slab track are underway. This study analysed characteristics of TQI values evaluating the track irregularity, searched the relationship between crack progress and TQI, and then evaluated of the correlation between the two values. Through this method, there is a need to complete the problems of the current method, only TQI is the main decision making tool in track maintenance, and also the need for the development of evaluation index considering the crack.

Investigation of serviceability of bridge deck ends on concrete slab track-installed bridges considering track-bridge interaction (궤도-교량 상호작용을 고려한 콘크리트 슬래브궤도 부설 교량의 단부 사용성 검토)

  • Jang, Seung-Yup;Yang, Sin-Chu;Kim, Jong-Tae
    • Proceedings of the KSR Conference
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    • pp.1875-1881
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    • 2007
  • Deformations of bridge deck ends on abutments or on transition between bridge decks can cause extreme deformations on track. Especially, since slab track is fixed onto the bridge deck slab on concrete slab track-installed bridges, deformations of bridge deck ends directly affect the track behavior, and thus these interactions can bring about the premature failure of rail fastenings or other deteriorations to lower the serviceability. In this study, a foreign standard to evaluate forces on track components caused by the track-bridge interactions and the serviceability of bridge deck ends is investigated, and for the real bridges, the serviceability of bridge deck ends according to several parameters of bridge and track is analyzed. It is found that arrangements and spring coefficients of bridge bearings, as well as distance between bridge bearing and last rail support, support spacings, rail support spring coefficient, are very important parameters.

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A Behavior Analysis of HSR Concrete Slab Track under Variety of Rail Pad Static Stiffness on Fatigue Effect (피로효과를 고려한 레일패드의 정적스프링계수 변화에 따른 콘크리트 슬래브 제도의 거동분석)

  • Park, Yong-Gul;Kang, Kee-Dong;Choi, Jung-Youl
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.499-505
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    • 2007
  • The major effective of this study is to investigate the fatigue effects of rail pad on High Speed Railway with concrete slab track system. It analyzed the mechanical behaviors of HSR concrete slab track with applying rail pad stiffness based on fatigue effect (hardening and increasing stiffness) on the 3-dimensional FE analysis and laboratory test for static & dynamic characteristics. As a result, the hardening of rail pad due to fatigue loading condition are negative effect for the static & dynamic response of concrete stab track which is before act on fatigue effect. The analytical and experimental study are carried out to investigate rail pad on fatigue effected increase vertical acceleration and stress and decrease suitable deflection on slab track. And rail pad based on fatigue effect induced dynamic maximum stresses, the increase of damage of slab track is predicted by adopting fatigue effected rail pad. after due consideration. The servicing HSR concrete slab track with resilient track system has need of the reasonable determination after due consideration fatigue effect of rail pad stiffness which could be reducing the effect of static and dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.

Experimental Study on Development of A New Steel Fiber Concrete Slab Track (새로운 슬래브궤도 개발을 위한 실험적 연구)

  • Kang, Bo-Soon
    • Proceedings of the KSR Conference
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    • pp.111-116
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    • 2003
  • The Permanent Way consisting of rails and sleeper laid on ballast is a technically and economically viable solution. After two decades of targeted research and development activities Slab Track turned out to be a reasonable option on special fields. Slab Track proves that especially under extreme condition and loads - they reliably help stability and a long service life of track. Technical and experimental solution of slab track are particularly underlined. This paper presents a few Results of the experiments of SFRC slab tracks under fatigue load.

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A Comparison of Behavior of the Roadbeds of Ballasted & Concrete Track with the Cyclic Loading (자갈궤도와 콘크리트궤도에서의 하중재하에 따른 노반거동 비교)

  • Choi, Chan-Yong;Lee, Sung-Heok;Eum, Ki-Young
    • Journal of the Korean Geosynthetics Society
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    • v.9 no.3
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    • pp.1-8
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    • 2010
  • The track systems installed in Korea railway consist of two types on ballasted track or ballastless track. In this study, it was compared with difference of the behaviors at roadbed with cyclic loading through full scale model test. From the results of model tests, loading distribution ratio of the concrete slab track become more widely distributed than ballasted track, and loading distribution ratio at concrete track was about 30:20:15. The concrete slab track is likely to behavior of the rigid plate, while ballasted track is such as flexible pavement. The vertical stresses of upper roadbed with traffic cyclic loading in concrete track were measured about 30 kPa or less. It was a scene very similar to the results of the field train running test. The vertical stress at concrete track was occurred approximately 4 times smaller than ballasted track. Also, the soil velocities with cyclic loading at the slab track were occurred about 0.3 cm/sec or less, its 8 times smaller than ballasted track.

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A Study on noise measurement result of track noise absorber (도상흡음재의 도상시험에 관한 고찰)

  • Kim, Jin-Ho;Han, Suk-Yoon;Jung, Jang-Yong;Mun, Je-Woo
    • Proceedings of the KSR Conference
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    • pp.1038-1042
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    • 2008
  • The construction of concrete slab track system is increased recently but the noise level on slab track is 3dB(A) higher than the one on ballast track since most of noise is reflected on slab track. Currently, concrete slab track systems has been designed for Gyungbu high speed line stage 2 and Honam high speed line. For those tracks, noise absorbing blocks are considered. In this paper, noise absorbing blocks were installed at Hwang Hak tunnel for evaluation of noise absorbing blocks and the indoor noise of KTX was measured. The results have done comparative analysis.

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A Study on material performance tests of track noise absorber (도상흡음재의 재료성능 시험결과에 관한 고찰)

  • Kim, Jin-Ho;Lee, Kwang-Do;Kim, In-Soo
    • Proceedings of the KSR Conference
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    • pp.1821-1826
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    • 2008
  • The construction of concrete slab track system is increased recently because the system has advantages which are maintenance free and so on. However, the noise level on slab track is 3 db(A) higher than the one on ballast track since most of noise is reflected on slab track. Currently, concrete slab track systems has been designed for Gyungbu high speed line stage 2 and Honam high speed line. For those tracks, noise absorbing blocks are considered. Therefore, test methods and proper criteria for structural performance and reduction efficiency of noise absorbing blocks are required. In this study, tests were performed according to established test methods and criteria in previous study and the results have done comparative analysis.

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A precast slab track partially reinforced with GFRP rebars

  • Lee, Seung-Jung;Moon, Do-Young;Ahn, Chi-Hyung;Lee, Jong-Woo;Zi, Goangseup
    • Computers and Concrete
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    • v.21 no.3
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    • pp.239-248
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    • 2018
  • This study developed and investigated a precast slab track system partially reinforced with glass fiber reinforced polymer (GFRP) rebars in the transverse direction, which mitigated the loss of track circuit current by reducing magnetic coupling between the rails and steel reinforcements. An electric analysis was conducted and the results of the analysis verified that the GFRP rebars mitigate the reduced current strength produced by electro-magnetic induction. In the study, a three-dimensional finite element method and flexural experiments were used to study the mechanical behavior of the proposed slab track.

Horizontal Shear Behavior of Precast Concrete Slab Track on Bridge (교량구간 프리캐스트 콘크리트 슬래브궤도의 수평전단 거동)

  • Jang, Seung-Yup;Na, Sung-Hoon;Kim, Yu-Bong;Ahn, Ki-Hong
    • Proceedings of the KSR Conference
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    • pp.998-1001
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    • 2011
  • The concrete track on bridge should be designed to effectively cope with the behavior of the bridge superstructure. For this purpose, in general, shear keys are designed to be installed at a certain intervals on the bridge deck, and the track slab is cast on these shear keys to transfer the load induced by the relative displacement between track and bridge. In this study, to apply the precast concrete slab track on bridge, a shear key structure and its effective installation method are presented. Also, the structural behavior of this shear key has been evaluated by the laboratory mock-up test.

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Shear Key Design of Concrete Track on Bridge (교량구간 콘크리트궤도의 전단키 설계)

  • Back, Hyo-Sun;Lee, Ho-Ryong;Bae, Sang-Hwan;Cho, Hyun-Cheol
    • Proceedings of the KSR Conference
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    • pp.3251-3255
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    • 2011
  • Being the concrete track laid on bridge, due to track-bridge temperature difference, traction and brake force, and nosing force, the horizontal force can be applied to the track slab. Therefore, shear key structures to resist this horizontal force should be installed. The shear key structures installed in the Kyeong-Bu high-speed line are consisted of four shear keys at every slab with the length of 6 to 8m. However, in the point of view of construction, it is more advantageous to curtail the numbers of shear keys, and thus, the numbers and spacing of the shear keys should be carefully determined. In this study, hence, the effects of slab length, the numbers and spacing of the shear keys on design of shear key and track slab are examined.

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