振动式无缝线路应力放散方法验证及参数选择
许玉德1,2石梓煊1,2吴宣庆3汪鑫4薛志强1,2
Verification and Parameter Selection of Stress Releasing Method for Vibration-based CWR
XU Yude1,2SHI Zixuan1,2WU Xuanqing3WANG Xin4XUE Zhiqiang1,2
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作者信息:1.同济大学道路与交通工程教育部重点实验室， 201804， 上海
2.上海市轨道交通结构耐久与系统安全重点实验室，201804， 上海
3.辽宁省交通规划设计院有限责任公司， 110166， 沈阳
4.罗格斯大学， 08854， 新泽西州
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Affiliation:1.The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji University, 201804, Shanghai, China
2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, 201804, Shanghai, China
3.Liaoning Provincial Transportation Planning and Design Institute Co., Ltd., 110166, Shenyang, China
4.Rutgers University, 08854, State of New Jersey, USA
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.027
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中图分类号/CLCN:U213.9
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栏目/Col:土建工程
摘要:
［目的］为解决现有无缝线路应力放散方法存在的问题，以激振器代替撞轨器，提出一种振动式无缝线路应力放散新方法。［方法］基于现场作业流程，建立无缝线路应力放散有限元模型，结合实测锁定轨温，模拟作业前钢轨的非均匀温度应力状态。设置自然拉伸、撞轨拉伸、激振拉伸3种作业工况，以钢轨温度应力均值和标准差作为评价指标，对比分析各作业工况下的放散效果，并验证所提应力放散新方法的可行性。改变激振器参数（激振力幅值及频率），对比分析钢轨温度应力均值和标准差，确定所提应力放散新方法的最优激振参数。［结果及结论］振动式无缝线路应力放散作业后，钢轨温度应力均值和标准差显著降低，降幅分别达到了99.3%和66.4%，钢轨的非均匀温度应力状态得到了有效改善。不同激振参数对应力放散效果有一定的影响，当激振力幅值为5 kN、激振力频率为50 Hz时，作业钢轨的温度应力放散效果最佳。
Abstracts:
［Objective］To address issues with stress releasing approaches for the continuous welded rail (CWR), a novel vibration-based CWR stress releasing method is proposed, substituting the rail impactor with a vibrational exciter. ［Method］Based on the on-site procedure, a CWR stress releasing finite element model is established. The measured locking rail temperature is incorporated to simulate the pre-operation nonuniform temperature stress state. Three stress releasing operational scenarios, namely natural tension, impact tension, and vibration tension, are set. The mean and standard deviation of temperature stress are set as evaluation indicators to compare and analyze the release effects under each operating condition, and to verify the feasibility of the proposed new stress release method. By changing exciter parameters (excitation force amplitude and frequency), a comparative analysis of the rail temperature stress mean value and standard deviation are carried out to determine the optimal excitation parameters of the proposed new stress release method. ［Result & Conclusion］After the vibration-based CWR stress releasing operation, the mean and standard deviation of the rail temperature stress are significantly reduced, with the decrease values of 99.3% and 66.4% respectively, and the non-uniform temperature stress state of the rail is effectively improved. Certain influences of various excitation parameters on stress release effect are observed. The temperature stress release effect of the operating rail reaches the best when the excitation force amplitude is 5 kN and the excitation force frequency is 50 Hz.
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