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<p>A prerequisite for defining post-earthquake speed is to develop a representation framework for seismic track vertical irregularities that incorporates both seismic and structural uncertainties. This study examines the mechanism of damage progression and deterioration of track irregularity under longitudinal seismic action. Target seismic track vertical irregularities are generated, and serve as an intermediate link to formulate a damage evolution representation for the bridge-track-train system. Evaluation and design procedures are developed for assessing post-seismic train running performance on bridge. Findings reveal that the rails integrate the longitudinal motions of the girder and the piers into a coherent whole. Piers and girders at different locations exhibit consistent longitudinal vibration due to the track restraining effect, and the effect decreases the maximum response of taller piers while amplifying the minimum response of shorter piers. The rail vertical displacements situated on opposite sides of pier display antisymmetric, and a pronounced linear proportionality is observed between rail vertical displacements and longitudinal pier top displacements. A correlation exists between the upper bound of peak pier top displacement and the structural natural period, and the assessment process for post-seismic train operation capability can be streamlined through the correlation.</p>

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Seismic performance assessment and design of high-speed railway bridges using quantitative catastrophe representation models

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Jian Yu,
  • Biao Wei,
  • Yulin Feng,
  • Zhipeng Lai,
  • Lizhong Jiang,
  • Xianhao Nie,
  • Wangbao Zhou

摘要

A prerequisite for defining post-earthquake speed is to develop a representation framework for seismic track vertical irregularities that incorporates both seismic and structural uncertainties. This study examines the mechanism of damage progression and deterioration of track irregularity under longitudinal seismic action. Target seismic track vertical irregularities are generated, and serve as an intermediate link to formulate a damage evolution representation for the bridge-track-train system. Evaluation and design procedures are developed for assessing post-seismic train running performance on bridge. Findings reveal that the rails integrate the longitudinal motions of the girder and the piers into a coherent whole. Piers and girders at different locations exhibit consistent longitudinal vibration due to the track restraining effect, and the effect decreases the maximum response of taller piers while amplifying the minimum response of shorter piers. The rail vertical displacements situated on opposite sides of pier display antisymmetric, and a pronounced linear proportionality is observed between rail vertical displacements and longitudinal pier top displacements. A correlation exists between the upper bound of peak pier top displacement and the structural natural period, and the assessment process for post-seismic train operation capability can be streamlined through the correlation.