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<p>This study investigates the dynamic response of high-speed railway catenary systems under multi-directional seismic excitations and traveling wave effects. Ground motions are spatially variable and multi-dimensional, which may induce severe stress concentration and deformation. A validated finite element model of a seven‑span catenary with triangular cantilevers is adopted. Eleven PEER ground motions are scaled to 0.4&#xa0;g PGA and applied in transverse, longitudinal, bi‑ and tri‑directional forms. Results show that transverse excitation dominates cantilever and steady‑arm responses, with peaks 26 times those under longitudinal excitation. Tri‑directional excitation amplifies the responses of critical components by 28%–168% relative to unidirectional cases. Strong linear responses to PGA and high direction sensitivity are observed. Response amplification occurs near an apparent wave velocity of 100&#xa0;m/s. These findings support the seismic design and safety evaluation of catenary systems in earthquake‑prone regions.</p>

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Seismic dynamic response and sensitivity analysis of high-speed railway catenary systems under multidirectional excitations and traveling wave effects

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Jin Chen,
  • Qing-Bing Wan,
  • Hao-Lin Xin,
  • Bo Fu,
  • Deliang Ma

摘要

This study investigates the dynamic response of high-speed railway catenary systems under multi-directional seismic excitations and traveling wave effects. Ground motions are spatially variable and multi-dimensional, which may induce severe stress concentration and deformation. A validated finite element model of a seven‑span catenary with triangular cantilevers is adopted. Eleven PEER ground motions are scaled to 0.4 g PGA and applied in transverse, longitudinal, bi‑ and tri‑directional forms. Results show that transverse excitation dominates cantilever and steady‑arm responses, with peaks 26 times those under longitudinal excitation. Tri‑directional excitation amplifies the responses of critical components by 28%–168% relative to unidirectional cases. Strong linear responses to PGA and high direction sensitivity are observed. Response amplification occurs near an apparent wave velocity of 100 m/s. These findings support the seismic design and safety evaluation of catenary systems in earthquake‑prone regions.