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Experimental Study of Low-Frictional Behavior for Sliding Slab Track

슬라이딩 궤도의 저마찰 거동에 대한 실험적 연구

  • Received : 2016.11.29
  • Accepted : 2017.03.02
  • Published : 2017.04.30

Abstract

Railway bridges with continuously welded rail have a limitation of span length due to track-bridge interaction. In order to overcome this, a sliding slab track system has been developed that comprises with a low-frictional sliding layer between the bridge deck and the track slab to isolate the longitudinal behavior between the bridge and the track. In this study, a real scale track system is prepared to experimentally evaluate the longitudinal frictional behavior. Applied loading rates were 0.2, 1.0, 5.0 and 10mm/min; vertical mass on the track are track slab only, 5,000 and 10,000kg added mass, respectively. Test results showed that the resulting frictional coefficients varied from 0.22 to 0.33. In addition, 10,000 cycle loadings were applied to simulate repetitive sliding to represent 30 years of service life. The frictional coefficient increase was measured and found to be 7% of that of the initial loading stage, which means that the sliding layer is adequate to provide low-frictional behavior for the sliding slab track system. Effects of changes of the frictional coefficient of the sliding layer were analyzed by rail-structure interaction analysis.

Acknowledgement

Grant : 상호작용완화를 위한 궤도 및 교량 바닥판 구조 개발

Supported by : 국토교통부

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