桥梁收缩徐变诱发高速列车-CRTS Ⅱ型板式轨道-桥梁系统非线性动力相互作用研究

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摘要

混凝土桥梁的收缩徐变效应在高速铁路桥梁工程中不可避免，会导致桥梁竖向变形，并最终导致CRTSⅡ型纵连板式轨道和桥面之间出现脱空。针对这一实际工程问题，深入研究收缩徐变引起的高速列车-纵连板式轨道-桥梁系统非线性动力相互作用问题。对桥梁收缩徐变下纵连板式轨道-桥梁系统非线性接触机制进行讨论；提出桥梁收缩徐变条件下高速列车-纵连板式轨道-桥梁系统非线性动力相互作用研究方法；在此基础上研究桥梁收缩徐变对桥轨非线性接触行为、轨道层间相互作用、轨道混凝土结构附加动应力以及列车动态特性的影响。研究表明：提出的研究方法可以有效地研究收缩徐变条件下列车-纵连板式轨道-桥梁结构的动力相互作用问题。在收缩徐变条件下，梁端处出现了底座和桥面间的脱空现象。列车动荷载引起桥轨接触力明显增大，同时也导致脱空区域发生明显变化。整体来看脱空区域长度对速度并不敏感。梁端位置处的轨道层间力有明显变化，砂浆力变化比扣件力剧烈。轨道板和底座上表面主要以承受拉应力为主，仅在脱空区域附近才出现局部受压；而下表面则呈现相反的应力分布。收缩徐变效应主要影响列车的振动，而对轨下结构的振动影响较小。

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	陈兆玮

关键词 ：列车-轨道-桥梁动力相互作用, 收缩徐变, 动态接触, 纵连板式轨道, 行车性能

Abstract：

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 a longitudinal connected track and a bridge.Aiming at the dynamic contact between a longitudinal connected track and a bridge due to time-dependent effect of the 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 an established model, the nonlinear contacts between a longitudinal connected track and a bridge were deeply analyzed from static and dynamic perspectives.Then the dynamic performance of the train-track-bridge system was investigated.Results show that the proposed methodology is effective in studying the contact behaviors between a longitudinal connected track and a bridge subject to time-dependent effect of the bridge.Gaps appear at beam-end locations, and sharp contact behaviors are aroused at the locations of gap-edges and mid-spans.The length of gap is greatly decreased by a running train.Creep and shrinkage have great influence on train vibrations, while have almost no effect on track-bridge vibrations.Interlayer forces of track are obviously affected by bridge deformation and a running train.

Key words： train-track-bridge dynamic interaction creep and shrinkage dynamic contact longitudinal connected track train vibration

收稿日期: 2020-03-02 出版日期: 2021-06-28

引用本文:

陈兆玮. 桥梁收缩徐变诱发高速列车-CRTS Ⅱ型板式轨道-桥梁系统非线性动力相互作用研究[J]. 振动与冲击, 2021, 40(12): 1-8.
CHEN Zhaowei. Nonlinear dynamic contact behavior of high-speed train-CRTS Ⅱ slab track-bridge interaction caused by concrete creep and shrinkage. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(12): 1-8.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I12/1

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