Analysis on Vibration Reduction Characteristics of Ladder Track Structure on Metro Viaduct under Measured Track Irregularities

Abstract:

3D FEM models of ladder track and rail-bearing platform track on metro viaduct were established to analyze the vibration reduction characteristics of ladder track structure. Based on track irregularities measured by track inspection car, time-history vertical accelerations of rail, sleeper, flange and beam bottom were solved to contrast the dynamic characteristics of the two track structure. Results show that the vibration level of rail and sleeper are higher on ladder track than on rail-bearing platform track, and the vibration reducing effect of ladder track for flange and beam bottom mainly embodies in frequency range of 1~40Hz in which average vibration reduction values on flange and beam bottom are 28dB and 22dB, with maximum values 40dB and 33dB. The results can provide reference for design of ladder track as well as its application in metro line.

• Periodical: Applied Mechanics and Materials (Volumes 226-228)
• Pages: 406-410
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.226-228.406
• Online since: November 2012
• Authors: Xiao Zhou Liu, Song Liang Lian, Hong Liang Wei
• Keywords: Ladder Track Structure, Measured Track Irregularities, Metro, Rail-Bearing Platform Track, Vibration Level, Vibration Reduction Characteristics

References

[1] K W Ngai and C F Ng, Structure-Borne Noise and Vibration of Concrete Box Structure and Rail Viaduct, Journal of Sound and Vibration, Vol. 255 (2002) No.2, p.281.

DOI: 10.1006/jsvi.2001.4155

[2] Y Zhou, Y D Xu and H F Li, Ladder Track Structure—A New Line System of Urban Rail Transit, Urban Mass Transit, (2002) No.1, p.21.

[3] WAKUI H, MATSUMOTON, OKUDA H, et al, Structure and Design of Ladder Sleeper, New Railway Structure, Vol. 56 (2006) No.3, p.26.

[4] W B Wang, W N Liu and M Ma, et al, Experimental Study on the Dynamic Characteristics and the Vibration Mitigation Effect of Ladder Track System, China Railway Science, Vol. 31 (2010) No.2, p.24.

[5] Y S Deng, H Xia and Zenda Yasuo, et al, Experimental Study of Ladder Track on a Rail Transitelevayed Bridge, Engineering Machanics, Vol. 28 (2011) No.3, p.49.

[6] J W Zhan, H Xia and Zenda Yasuo, et al, Experimental Study on the Noise Reduction Performance of the Ladder Sleeper Track on the Elevated Bridges of Urban Rail Transit, China Railway Science, Vol. 32 (2011) No.1, p.36.

[7] Y Su, W N Liu and X J Sun, Research on Vibration Reduction Characteristics of Ladder Tracks by Numerical Simulation and Experiments, China Urban Rapid Rail Transit, Vol. 20 (2007) No.6, p.50.

[8] N. Ma: The Dynamic Analysis of Ladder Sleeper Track on Bridge (MS.D., Southwest Jiaotong University, China 2009), p.40.