Fatigue life prediction for high-speed railway bridges by reconstructing monitoring-based dynamic stress

IF 2.7 3区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Measurement Science and Technology Pub Date : 2024-07-02 DOI:10.1088/1361-6501/ad5dd8

Yuntao Wei, T. Yi, Dong‐Hui Yang, Hong‐Nan Li, Hua Liu

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Abstract

Bridge responses that are excited by high-speed trains have the characteristics of high amplitude, high cycle, and large dynamic effects, which greatly affect the fatigue bearing capacity of affected bridges. To achieve reliable analysis of the fatigue performance of high-speed railway bridges, this study developed a bridge fatigue life prediction method based on the reconstruction of the train-induced dynamic stress time history. First, the equations for solving the static stress time history under influence line virtual loading are derived, and then the dynamic stress time history reconstruction method based on two types of dynamic correction factors is proposed. The statistical characteristics of the train loads and dynamic correction factors are fit according to monitoring data, and bridge fatigue life prediction is realized by use of the reliability theory. Finally, the applicability and effectiveness of the proposed method are verified by using a train-bridge interaction model and monitoring data from a long-span high-speed railway bridge. The results show that the proposed method can greatly improve the accuracy of fatigue performance analysis and can effectively predict the fatigue life of high-speed railway bridges under complex loads. These results can provide an important reference for fatigue evaluation of high-speed railway bridges.

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通过重构基于监测的动态应力预测高速铁路桥梁的疲劳寿命

高速列车激发的桥梁响应具有高振幅、高周期、动态效应大等特点，对受影响桥梁的疲劳承载能力有很大影响。为实现对高速铁路桥梁疲劳性能的可靠分析，本研究开发了一种基于列车诱发动态应力时间历程重构的桥梁疲劳寿命预测方法。首先，推导了影响线虚载下的静应力时间历程求解方程，然后提出了基于两种动态修正系数的动态应力时间历程重构方法。根据监测数据拟合了列车荷载和动态修正系数的统计特征，并利用可靠性理论实现了桥梁疲劳寿命预测。最后，利用列车-桥梁相互作用模型和大跨度高速铁路桥梁的监测数据验证了所提方法的适用性和有效性。结果表明，所提出的方法能大大提高疲劳性能分析的准确性，并能有效预测高速铁路桥梁在复杂载荷作用下的疲劳寿命。这些结果可为高速铁路桥梁的疲劳评估提供重要参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Measurement Science and Technology 工程技术-工程：综合

CiteScore

4.30

自引率

16.70%

发文量

656

审稿时长

4.9 months

期刊介绍： Measurement Science and Technology publishes articles on new measurement techniques and associated instrumentation. Papers that describe experiments must represent an advance in measurement science or measurement technique rather than the application of established experimental technique. Bearing in mind the multidisciplinary nature of the journal, authors must provide an introduction to their work that makes clear the novelty, significance, broader relevance of their work in a measurement context and relevance to the readership of Measurement Science and Technology. All submitted articles should contain consideration of the uncertainty, precision and/or accuracy of the measurements presented. Subject coverage includes the theory, practice and application of measurement in physics, chemistry, engineering and the environmental and life sciences from inception to commercial exploitation. Publications in the journal should emphasize the novelty of reported methods, characterize them and demonstrate their performance using examples or applications.

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