Vertical derailment for near-fault high-speed train-track-hybrid control cable-stayed bridge system

• Lingkun Chen ^[1] ; Qingyun Miao ^[1] ; Lizhong Jiang ^[2] ; Qizhi Chen ^[3] ; Tuan Ngo ^[4]
  1. [1] Yangzhou University

     Yangzhou University

     China

     
  2. [2] Central South University

     Central South University

     China

     
  3. [3] University of Arizona

     University of Arizona

     Estados Unidos

     
  4. [4] University of Melbourne

     University of Melbourne

     Australia

     

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• Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 53, Nº. 8, 2025, págs. 5888-5914
• Idioma: inglés
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• Resumen

  • The seismic protection of high-speed rail (HSR) bridges must be based on the safe running of trains on those structures. Passive control systems, including lead rubber bearings, can mitigate the seismic forces acting on bridges. Nonetheless, this could result in an escalation of the bridge’s displacement, perhaps causing train derailment. The present study analyzes the influence of near-fault (NF) vertical seismic effects, characterized by the significant vertical ground motion (VGM), on the alignment safety of all vehicles in a train formation operating on a hybrid-controlled HSR cable-stayed bridge, utilizing a tail vehicle tracking window (TVTW) model that reflects wheel-rail interaction. The research findings indicate that the escalation of VGM poses the most significant risk to safety; the phenomenon termed "vertical derailment" arises from an elevated VGM due to larger lateral wheel-rail contact forces (LWRCF), leading to climbing rail derailment, which is interconnected with the roll derailment mechanism. Furthermore, an increased VGM may also induce wheel load reduction, leading to the separation of the wheel from the rail and subsequent derailment. The findings indicate that the hybrid control system presented in this study outperforms individual active or semi-active control approaches and may efficiently reduce the seismic response of the axle system. The suggested hybrid control system may be efficiently implemented in cable-stayed bridges exposed to seismic disturbances to guarantee safe train operations on the structure.