铁路过渡区:对于关键负载条件的新型过渡结构的能源评估
A Jain1, A V Metrikine1, M J M M Steenbergen1
1Faculty of Civil Engineering and Geosciences (CEG), Department of Engineering Structures, TU Delft, Stevinweg 1, 2628 CN Delft, The Netherlands.
Journal of vibration engineering & technologies
|February 25, 2025
概括
铁路过渡区经历了放大了退化. 一个新的设计,SHIELD,有效地减轻动态放大和退化,即使有轨道不完美,确保统一的磨损.
科学领域:
- 土木工程 土木工程是指土木工程.
- 铁路工程 铁路工程是指铁路工程.
- 结构工程 结构工程
背景情况:
- 堤防和桥梁结构之间的铁路过渡区 (RTZ) 面临着扩大退化,增加维护成本和减少运营可用性.
- 现有的缓解措施需要在关键负载和轨道条件下进行评估,以确保设计的强度.
- 了解RTZ中的动态放大和退化模式对于改善轨道性能和寿命至关重要.
研究的目的:
- 调查铁路过渡区的关键负载条件,考虑各种速度,负载方向和轨道缺陷.
- 在这些关键条件下评估SHIELD (安全船体启发的能源限制设计) 过渡结构在这些关键条件下的性能.
- 为了证明SHIELD设计在缓解动态放大和确保均降解方面的强度.
主要方法:
- 采用了RTZ的有限元模型 (FEM) 和全面的车辆模型.
- 分析包括亚临界,临界和超临界速度,考虑负载方向和惯性效应.
- 该研究纳入了轨道缺陷,如非直轨和悬挂卧架,以及多轴通道.
主要成果:
- 盾牌设计有效地减轻了所有速度模式和负载运动的两个方向的动态放大.
- 发现应变能量分布是平稳的,这表明纵向降解是均的.
- 盾结构表现出优越的性能,即使有轨道缺陷,如悬挂的卧架和非直线轨道.
结论:
- SHIELD过渡结构是铁路过渡区的强大设计解决方案,有效地管理动态负载和退化.
- 它在各种不利条件下表现良好的能力确保了轨道可用性改善和维护减少.
- 这些发现支持广泛采用SHIELD设计,以提高铁路基础设施的弹性.
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