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Effect of Bridge-Pier Differential Settlement on the Dynamic Response of a High-Speed Railway Train-Track-Bridge System

机译：桥墩差异沉降对高速铁路车轨桥系统动力响应的影响

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摘要

A model based on the theory of train-track-bridge coupling dynamics is built in the article to investigate how high-speed railway bridge pier differential settlement can affect various railway performance-related criteria. The performance of the model compares favorably with that of a 3D finite element model and train-track-bridge numerical model. The analysis of the study demonstrates that all the dynamic response for a span of 24m is slightly larger than that for a span of 32m. The wheel unloading rate increases with pier differential settlement for all of the calculation conditions considered, and its maximum value of 0.695 is well below the allowable limit. Meanwhile, the vertical acceleration increases with pier differential settlement and train speed, respectively, and the values for a pier differential settlement of 10mm and speed of 350 km/h exceed the maximum allowable limit stipulated in the Chinese standards. On this basis, a speed limit for the exceeding pier differential settlement is determined for comfort consideration. Fasteners that had an initial tensile force due to pier differential settlement experience both compressive and tensile forces as the train passes through and are likely to have a lower service life than those which solely experience compressive forces.
机译：本文建立了一个基于列车－轨道－桥梁耦合动力学理论的模型，以研究高速铁路桥墩的差异沉降如何影响与铁路性能相关的各种标准。该模型的性能优于3D有限元模型和火车-轨道-桥梁数值模型。研究分析表明，跨度为24m的所有动力响应都略大于跨度为32m的动力响应。在所有考虑的计算条件下，车轮卸载率都会随着墩台差异沉降而增加，其最大值0.695远低于允许极限。同时，竖向加速度分别随墩差沉降和列车速度的增加而增加，墩差沉降10mm的值和时速350 km / h超过了中国标准规定的最大允许极限。在此基础上，出于舒适性考虑，确定了超出码头差异沉降的速度极限。由于桥墩的差异沉降而产生初始拉力的紧固件在列车通过时会同时承受压缩力和拉力，并且使用寿命可能会比仅承受压缩力的紧固件低。

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  • 来源
    《Mathematical Problems in Engineering》 |2017年第9期|8960628.1-8960628.13|共13页
  • 作者

    Zhang Xiaohui; Shan Yao; Yang Xinwen;

  • 作者单位

    Tongji Univ, Key Lab Rd & Traff Engn, Minist Educ, Shanghai 201804, Peoples R China;

    Tongji Univ, Key Lab Rd & Traff Engn, Minist Educ, Shanghai 201804, Peoples R China;

    Tongji Univ, Key Lab Rd & Traff Engn, Minist Educ, Shanghai 201804, Peoples R China;

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