Dynamic contact between CRTS II slab track and bridge due to time-dependent effect of bridge and its influence on train-track-bridge interaction
Dynamic contact between CRTS II slab track and bridge due to time-dependent effect of bridge and its influence on train-track-bridge interaction
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DOI：
10.1016/j.engstruct.2021.111974
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发表时间：
2021-05
影响因子：
5.5
通讯作者：
Zhaowei Chen
中科院分区：
文献类型：
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作者：
Zhaowei Chen
高速铁路混凝土桥梁在运营过程中不可避免地会出现混凝土徐变和混凝土收缩，导致桥梁变形，进而造成CRTS（中铁轨道系统）II型板式轨道与桥梁之间的间隙。针对CRTS II型板式轨道与桥梁之间因桥梁时变效应而产生的动态接触及其对列车-轨道-桥梁相互作用的影响，在探究其产生机制的基础上，提出了一种研究这种动态接触行为的方法。采用所建立的模型，从静态和动态角度对CRTS II型板式轨道与桥梁之间的非线性接触进行了深入分析。最后，还研究了动态接触对列车-轨道-桥梁相互作用的影响。结果表明，该方法在研究桥梁时变效应下 CRTS II 板式轨道与桥梁之间的接触行为方面是有效的。间隙出现在梁端位置，并且在间隙边缘位置引起尖锐的接触行为。列车运行使间隙长度大大缩短。蠕变和收缩对列车振动影响较大，而对轨桥振动几乎没有影响。轨道层间力受桥梁变形和列车运行的影响明显。
Concrete creep and concrete shrinkage are unavoidable in the operation of concrete bridges in high-speed railways, which lead to bridge deformation and then cause gaps between CRTS (China Railway Track System) II slab track and bridge. Aiming at the dynamic contact between CRTS II slab track and bridge due to time-dependent effect of bridge and its influence on train-track-bridge interaction, this work proposes a method for investigating this dynamic contact behavior after exploring its generation mechanism. Adopting the established model, the nonlinear contacts between CRTS II slab track and bridge are deeply analyzed from static and dynamic perspectives. Finally, the influence of the dynamic contact on the train-track-bridge interaction is also investigated. Results show that the proposed methodology is effective in studying the contact behaviors between CRTS II slab track and bridges subject to time-dependent effect of bridge. Gaps appear at beam-end locations, and sharp contact behaviors are aroused at the locations of gap-edges. The length of gap is greatly decreased by running train. Creep and shrinkage have great influence on the train vibrations, while have almost no effect on track-bridge vibrations. Interlayer forces of track are obviously affect by bridge deformation and running train.