Abstract This paper addresses the methodology of the bridge-vehicle dynamic model definition based on the free response measurements of an existing train and existing bridge spans. In the case of the railway vehicle, the methodology uses the impulse excitations of a single car by means of the wedge method. In the case of the bridge spans, free responses are collected after the passages of trains. The global modal parameters (frequencies and modal damping) of both structures are identified using two modal identification techniques, i.e., the eigensystem realization algorithm (ERA) and the peak picking method (PP). A simplified single-suspension model of the vehicle with 11 global dof’s is proposed that can be useful in the bridge-vehicle interaction analysis. Two steel spans having non-ballasted tracks are the bridge structures. Field tests are conducted to identify the modal parameters and validate the numerical models. Finally, numerical simulations of the train passing over the bridges are compared with the in situ measurements performed under operating conditions.

中文翻译：

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基于现有 EN57 列车和无砟轨道桥梁跨度的模态识别结果的动态车桥模型

摘要 本文讨论了基于现有列车和现有桥梁跨度的自由响应测量的桥梁车辆动力学模型定义方法。在铁路车辆的情况下，该方法通过楔形方法使用单个车厢的脉冲激励。在桥梁跨度的情况下，在列车通过后收集自由响应。两种结构的全局模态参数（频率和模态阻尼）都使用两种模态识别技术来识别，即本征系统实现算法（ERA）和峰值拾取方法（PP）。提出了具有 11 个全局自由度的车辆简化单悬架模型，该模型可用于桥梁-车辆相互作用分析。具有无砟轨道的两个钢跨是桥梁结构。进行现场测试以确定模态参数并验证数值模型。最后，将列车通过桥梁的数值模拟与在运行条件下进行的现场测量进行比较。