Significant dynamic deformations during the operation of kilometer‐span high‐speed railway bridges adversely affect track maintenance. This paper proposes a three‐stage smoothness control method based on a comprehensive analysis of track alignment characteristics to address this issue. In the method, historical measured data are grouped into multicategories, and reference alignments for each category are reconstructed. Then, the reference alignment category to which the track to be adjusted belongs is accurately matched. Finally, a novel smoothness optimization algorithm is designed to use the 60 m chord as the optimization unit, and the 10 m and 30 m combined chords within the unit constrain the midchord offset and vector distance difference. The proposed method was applied to formulate the maintenance scheme for the Shanghai–Suzhou–Nantong Yangtze River Bridge. The result indicates that the track smoothness improved by more than 79.7%, and the high‐speed train operational performance improved by over 64.3%, effectively enhancing the maintenance quality.

中文翻译：

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基于轨道特性分析的千米跨铁路桥梁平稳控制方法

千米跨高速铁路桥梁运营过程中的显着动态变形对轨道维护产生不利影响。针对这一问题，本文提出一种基于轨道线形特性综合分析的三阶段平滑控制方法。在该方法中，历史测量数据被分为多个类别，并且重建每个类别的参考对齐。然后，准确匹配待调整轨道所属的参考对齐类别。最后，设计了一种新颖的平滑度优化算法，以60 m弦作为优化单元，单元内的10 m和30 m组合弦约束中弦偏移和矢量距离差。应用该方法制定了沪苏通长江大桥的养护方案。结果表明，轨道平整度提高了79.7%以上，高铁运行性能提高了64.3%以上，有效提升了维护质量。