Investigating the relations proposed for the dynamic impact factor in the railway (in terms of velocity parameter of the railway vehicle)

Document Type : Original Article

Authors

1 Department of Railway Engineering and Transportation Planning, Faculty of Civil and Transportation Engineering, Isfahan University, Isfahan, Iran

2 Department of Mechanical Engineering, Faculty of Technical and Engineering, Isfahan University, Isfahan, Iran

Abstract

Railways experience dynamic vertical forces due to their transitive nature and the presence of faults and failures in both the rail infrastructure and vehicles. Precisely determining these forces, considering their dynamic effects, is a time-consuming process. For design purposes, vertical forces are often treated as quasi-static. The quasi-static force of a railway wheel, which includes dynamic impacts, is calculated by multiplying the static force (total weight of the vehicle divided by the number of wheels) by an increasing dynamic impact factor coefficient. Various relationships have been proposed by institutions and researchers in the rail transport industry to calculate this dynamic impact factor, with a focus on those considering the railway vehicle's velocity. The study reveals that Talbot's formula recommends cautious measures for dynamic impact coefficients at speeds exceeding 44 km/h, and Mir Mohammad Sadeghi's formula suggests the smallest values for speeds above 84 km/h when compared to other formulas.

Keywords


  • Remennikov, A. M., & Kaewunruen, S. (2008). A review of loading conditions for raislway track structures due to train and track vertical interaction. Structural Control and Health Monitoring: The Official Journal of the International Association for Structural Control and Monitoring and of the European Association for the Control of Structures, 15(2), 207-234. https://doi.org/10.1002/stc.227
  • Mir Mohammad Sadeghi, S.J. (2020). Principles and basics of analysis and design of ballast railroads. Iran University of Science and Technology Press, Iran, Tehran.
  • Steffens, D. M. (2005). Identification and development of a model of railway track dynamic behaviour (Doctoral dissertation, Queensland University of Technology).
  • [1] Au, F. T. K., Wang, J. J., & Cheung, Y. K. (2001). Impact study of cable-stayed bridge under railway traffic using various models. Journal of Sound and Vibration, 240(3), 447-465. https://doi.org/10.1006/jsvi.2000.3236
  • Deng, L., Yu, Y., Zou, Q., & Cai, C. S. (2015). State-of-the-art review of dynamic impact factors of highway bridges. Journal of Bridge Engineering, 20(5), 04014080. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000672
  • Huang, P., Wang, J., Han, W., & Yuan, Y. (2022, September). Study on impact factors of small-and medium-span bridges under the special-purpose vehicle load. In Structures (Vol. 43, pp. 606-620). Elsevier.
  • Pieraccini, M., Miccinesi, L., Abdorazzagh Nejad, A., & Naderi Nejad Fard, A. (2019). Experimental dynamic impact factor assessment of railway bridges through a radar interferometer. Remote Sensing, 11(19), 2207. doi:10.3390/rs11192207
  • Paeglite, I., & Paeglitis, A. (2013). The dynamic amplification factor of the bridges in Latvia. Procedia Engineering, 57, 851–858. doi:10.1016/j.proeng.2013.04.108
  • Ataei, S., & Miri, A. (2018). Investigating dynamic amplification factor of railway masonry arch bridges through dynamic load tests. Construction and Building Materials, 183, 693–705. doi:10.1016/j.conbuildmat.2018.06.151
  • Frýba, L. (2001). A rough assessment of railway bridges for high velocity trains. Engineering Structures, 23(5), 548-556. https://doi.org/10.1016/S0141-0296(00)00057-2
  • Xia, H., & Zhang, N. (2005). Dynamic analysis of railway bridge under high-velocity trains. Computers & Structures, 83(23-24), 1891-1901.
  • Youliang, D., & Gaoxin, W. (2016). Evaluation of dynamic load factors for a high-velocity railway truss arch bridge. Shock and Vibration, 2016. https://doi.org/10.1155/2016/5310769
  • Frýba, L. A. D. I. S. L. A. V. (2008). Dynamic behaviour of bridges due to high velocity trains. In Bridges for High-Velocity Railways (pp. 135-152). CRC Press. https://doi.org/10.1201/9780203892541.ch8
  • Bezgin, N. Ö. (2017). Development of a new and an explicit analytical equation that estimates the vertical dynamic impact loads of a moving train. Procedia Engineering, 189, 2–10. doi:10.1016/j.proeng.2017.05.002
  • Wakui, H., Matsumoto, N., & Watanabe, T. (1989). Design impact factor for concrete railway bridges. Railway Technical Research Institute, Quarterly Reports, 30(2).
  • Nouri, M., & Mohammadzadeh, S. (2020). Probabilistic estimation of dynamic impact factor for masonry arch bridges using health monitoring data and new finite element method. Structural Control and Health Monitoring, 27(12). doi:10.1002/stc.2640
  • Gu, G., Kapoor, A., & Lilley, D. M. (2008). Calculation of dynamic impact loads for railway bridges using a direct integration method. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 222(4), 385–398. doi:10.1243/09544097jrrt189.
  • Hamidi, S. A., & Danshjoo, F. (2010). Determination of impact factor for steel railway bridges considering simultaneous effects of vehicle velocity and axle distance to span length ratio. Engineering Structures, 32(5), 1369-1376. https://doi.org/10.1016/j.engstruct.2010.01.015
  • Moghimi, H., & Ronagh, H. R. (2008). Impact factors for a composite steel bridge using non-railroadar dynamic simulation. International Journal of Impact Engineering, 35(11), 1228-1243. https://doi.org/10.1016/j.ijimpeng.2007.07.003
  • Senthil, K., Tewari, D., Sharma, A., & Singh, N. (2022). Influence of Parameters on the Prediction of Dynamic Impact Factor for Railway Bridges: A Review. Recent Advances in Materials, Mechanics and Structures: Select Proceedings of ICMMS 2022, 165-175. https://doi.org/10.1007/978-981-19-3371-4_15 
  • Schramm, G., (1961), Permanent way Technique and Permanent way Engineering (English translation by Hans Large), Otte Elsner verlargs gersellashaft Darmstadt, 66-70.
  • Driessen, C. H. (1937). Die einheitliche Berechnung des Oberbaues im Verein Mitteleuropäischer Eisenbahnverwaltungen. Organ für die Fortschritte des Eisenbahnwesens, 113-126.
  • Talbot, A. N. (1941). Stresses in railroad track, Report of the Special Committee on Stresses in Railroad Track. Proceeding of the AREA, Seventh progress report, Vol.42, 753-850.
  • Sadeghi, J. (1997). Investigation of characteristics and modelling of railway track system.
  • Doyle, N. (1980). Railway track design, a review of current practice. Australian Government Publishing Service, Canberra, Australia, 5-35.
  • Sadeghi, J. M., & Youldashkhan, M. (2005). Investigation on the accuracy of the current practices in analysis of railway track concrete sleepers. International Journal of Civil Engineering, 3(1), 31-45.