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Post-Construction Alignment Revision in Direct-Fixation Railroad Tracks

Author

Listed:
  • Eungcheol Kim

    (Incheon National University, Yeonsu-gu, Incheon 22012, Korea)

  • Myungseob (Edward) Kim

    (Western New England University, Springfield, MA 01095, USA)

  • Gabrielle Delos

    (Western New England University, Springfield, MA 01095, USA)

  • Tyler Clark

    (Western New England University, Springfield, MA 01095, USA)

Abstract

In railroad construction—in particular, direct-fixation tracks—a longitudinal concrete block known as a “plinth” is used to elevate the profiles of the railroad track from the aerial guideway (e.g., bridge deck). A post-construction alignment revision is often required if the plinth elevation surpasses its maximum tolerance after the concrete pour. In such cases, the plinth surface needs to be grinded to meet the design elevation, or a shim should be inserted underneath the rail pad to raise the profile elevation. Considering both sides of the rail plinths, vertical design factors, and performance specifications, re-optimization of the vertical profile is of great interest, but the process poses challenges and represents a practical research problem. An optimization model aimed at minimizing the cost of post-construction alignment repairs is proposed and a real-case numerical example is analyzed to check the effectiveness of the model.

Suggested Citation

  • Eungcheol Kim & Myungseob (Edward) Kim & Gabrielle Delos & Tyler Clark, 2019. "Post-Construction Alignment Revision in Direct-Fixation Railroad Tracks," Sustainability, MDPI, vol. 11(21), pages 1-14, November.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:21:p:6166-:d:283588
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    References listed on IDEAS

    as
    1. Kim, Eungcheol & Jha, Manoj K. & Son, Bongsoo, 2005. "Improving the computational efficiency of highway alignment optimization models through a stepwise genetic algorithms approach," Transportation Research Part B: Methodological, Elsevier, vol. 39(4), pages 339-360, May.
    2. Jha, Manoj K. & Schonfeld, Paul, 2004. "A highway alignment optimization model using geographic information systems," Transportation Research Part A: Policy and Practice, Elsevier, vol. 38(6), pages 455-481, July.
    3. Jong, Jyh-Cherng & Schonfeld, Paul, 2003. "An evolutionary model for simultaneously optimizing three-dimensional highway alignments," Transportation Research Part B: Methodological, Elsevier, vol. 37(2), pages 107-128, February.
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