Volume 26 Issue 6
Jun.  2026
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WANG Hui, SHEN Rui-li, LIU Gao, XIN Hao-hui, YIN Ru-yang. Longitudinal movement characteristics and rational restraint systems of long-span railway suspension bridges under train load[J]. Journal of Traffic and Transportation Engineering, 2026, 26(6): 21-35. doi: 10.19818/j.cnki.1671-1637.2026.232
Citation: WANG Hui, SHEN Rui-li, LIU Gao, XIN Hao-hui, YIN Ru-yang. Longitudinal movement characteristics and rational restraint systems of long-span railway suspension bridges under train load[J]. Journal of Traffic and Transportation Engineering, 2026, 26(6): 21-35. doi: 10.19818/j.cnki.1671-1637.2026.232
shu

Longitudinal movement characteristics and rational restraint systems of long-span railway suspension bridges under train load

doi: 10.19818/j.cnki.1671-1637.2026.232
  • 1.

    School of Civil Engineering, Southeast University, Nanjing 211189, Jiangsu, China

  • 2.

    State Key Laboratory of Safety, Durability and Healthy Operation of Long Span Bridges, Southeast University, Nanjing 211189, Jiangsu, China

  • 3.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Funds:

National Key R&D Program of China 2022YFB3706702

National Natural Science Foundation of China 52502378

National Natural Science Foundation of China 52595691

National Natural Science Foundation of China 52595694

Scientific Research Project of CCCC ZKZX-2023-01

More Information
  • Corresponding author: LIU Gao, professor, PhD, E-mail: liugao77@seu.edu.cn
  • Received Date: 2025-11-03
  • Accepted Date: 2026-03-23
  • Rev Recd Date: 2026-01-26
  • Publish Date: 2026-06-28
    Abstract
  • To investigate the longitudinal movement characteristics of long-span railway suspension bridges under train loads and determine a rational longitudinal restraint system, a field test was conducted to analyze the longitudinal movement responses at the girder ends during train passage. A refined longitudinal dynamic analysis model was developed based on an in-service railway suspension bridge, and its reliability was verified by comparing with measured results. Based on this, analysis models of different longitudinal restraint systems were established, and a transient dynamic analysis method was adopted to compare the longitudinal vibration responses at the girder ends and the mechanical behaviors of key connecting components under train loads. The results indicate that when a single-tower fixed restraint is adopted, the peak longitudinal displacement of the movable bearing caused by train passage is 9.80 mm. Due to the influence of bearing friction and girder-rail interaction, the bearing fails to reset rapidly after the train passes. The developed longitudinal dynamic model accurately characterizes the dynamic variations of longitudinal bearing displacement during the whole process of train passage, and the peak displacement agrees well with the test results. Increasing longitudinal restraint stiffness and adding supplemental damping can both effectively suppress the longitudinal vibration of the stiffening girder. Under the floating system, the longitudinal displacement amplitude at the girder end reaches 79.2 mm, which decreases to 43.1 mm after the central buckle is set and further decreases to 30.5 mm after the damper is added. The central buckle significantly improves the mechanical behaviors of short hangers. Without the central buckle, the maximum bending stress of the hanger is 23.57 MPa, which decreases to 8.03 MPa after installation, with a reduction of 65.9%. The stress amplitude of the central buckle shows an increasing trend with the increase of longitudinal restraint stiffness and reaches 191.59 MPa and 205.92 MPa after adding dampers or considering bearing friction, respectively. Excessive longitudinal restraint stiffness doubles the bending stress of short hangers, causes stress concentration in the central buckle, and seriously threatens the service life of mid-span connecting components. The design of longitudinal restraint systems for long-span railway suspension bridges should comprehensively consider the longitudinal displacement control at the girder ends and the mechanical balance of short hangers to avoid unfavorable internal force concentration of components caused by excessive longitudinal restraint stiffness. The research results can provide a reference for the design optimization and healthy operation and maintenance of longitudinal restraint systems for long-span railway suspension bridges.

     

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