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针对现有预制短钢弹簧浮置板轨道剪力铰结构薄弱、稳定性不足等问题，提出一种新型湿接装配式钢弹簧浮置板轨道，开展优化设计与力学建模分析，揭示轨道系统静力特性、动力响应、模态特征及减振性能。钢弹簧浮置板轨道通过预制短浮置板间现浇超高性能混凝土（ultra-high performance concrete,UHPC）湿接缝形成长板装配单元，兼具预制短浮置板高质量工厂化生产与现浇道床整体稳定性，可显著减少剪力铰数量；列车荷载下轨道应力均低于材料强度限值，钢轨最大垂向位移为3.8 mm，板缝位置折角较小，受力性能良好；当行车速度为100～140 km/h时，随着速度的增加，车辆和浮置板垂向振动加速度分别增加了10.9%和24.7%，其余动力响应指标变化不明显，系统各项动力响应指标均满足规范限值；轨道系统第一阶振型频率为11.04 Hz,Z振级减振量达20.11 dB，满足特殊减振需求。
Abstract：To address the issues of the insufficient stability and the structural weakness of shear hinges in existing precast short steel spring floating slab track systems, a novel wet-joint precast assembly steel spring floating slab track was proposed. Optimization design and mechanical modeling analysis were conducted to reveal the static characteristics, dynamic responses, modal features, and vibration damping performance of the track system. The steel spring floating slab track forms long-slab assembly units by casting ultra-high performance concrete(UHPC) wet joints between precast short floating slabs, combining the high-quality factory production of precast short floating slabs with the integral stability of cast-in-place track beds, which significantly reduces the number of shear hinges. Under train loads, the track stresses remain below material strength limits with a maximum vertical displacement of 3. 8 mm in the rail and minimal angular deflection at slab joints, demonstrating favorable mechanical performance. Within the speed range of 100-140 km/h, the vertical vibration accelerations of vehicles and floating slabs rise by 10. 9% and 24. 7%, respectively, as the speed increases. On the other hand, other dynamic response indicators show negligible changes, and all system dynamic response indicators comply with regulatory limits. The first-order modal frequency of the track system is 11. 04 Hz, and a Z-vibration level reduction of it is 20. 11 dB, satisfying special vibration damping requirements.
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基本信息:
DOI：
中图分类号:U213.2
引用信息:
[1]任西冲.装配式钢弹簧浮置板轨道设计优化及性能分析[J].中国科技论文,2025,20(07):599-607.
基金信息:
湖北省重点研发计划项目(2023BAB151); 武汉市科技计划项目(2023010402010587); 铁四院科技研发课题项目(KY2024002S)